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? 2013 microchip technology inc. ds20005251a-page 1 datasheet product features EMC2113 rpm-based fan controller with multiple temperature zones & hardware thermal shutdown general description the EMC2113 is an smbus compliant fan controller. the fan driver can be operated using two methods, each with two modes. the methods include an rpm-based fan speed control algorithm and a direct pwm drive setting. the modes include manually programming the desired settings or using the internal programmable temperature look-up table to select the desired setting based on measured temperature. the EMC2113 includes a temperature monitor that measures up to three (3) external diodes and the internal diode. the temperature monitors offer 1c accuracy (for external diodes) with sophisticated features to reduce errors introduced by series resistance and beta variation of substrate thermal diode transistors commonly found in processors. the device includes high and low limits for all temperature channels as well as a hardware set critical temperature limit. this hardware set limit drives a dedicated system shutdown pin. finally, the device includes an open-drain, active low interrupt pin to flag temperature or fan control errors. applications ? notebook computers ? projectors ? graphics cards ? industrial and networking equipment features ? programmable fan control circuit ? 4-wire fan compatible ? both low and high frequency pwm ? rpm-based fan control algorithm ? 2% accurate from 500 rpm to 16k rpm ? automatic tachometer feedback ? temperature look-up table ? controls fan speed or pwm drive setting ? eight steps that incorporate up to four temperature zones simultaneously (user selectable) ? supports forced dts or standard temperature data ? allows external pwm input (150hz to 40khz) ? up to three external temperature channels ? supports transistor model for 90nm - 45nm intel cpus ? resistance error correction and beta compensation ? 1c accurate (60c to 125c) ? 0.125c resolution ? programmable high and low limits ? hardware programmable thermal shutdown temperature ? cannot be altered by software ? 65c to 127c range ? dedicated system shutdown interrupt pin ? internal temperature monitor ? 1c accuracy ? 0.125c resolution ? 3.3v supply voltage ? open drain interrupt pin ? smbus 2.0 interface ? smbus alert compatible ? selectable smbus address via pull-up resistor and addr_sel pin ? block read and write ? available in 16-pin 4mm x 4mm qfn rohs compliant package
this product meets the halogen maximum concentration values per iec61249-2-21 ordering number package features EMC2113-1-ap-tr 16-pin 4mm x4mm qfn (rohs compliant) rpm-based fan speed control algorithm, high frequency pwm driver, hw thermal / critical shutdown rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 2 ? 2013 microchip technology inc. ordering information:
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 3 table of contents chapter 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 chapter 2 delta from emc2103. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 chapter 3 pin layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 chapter 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2 smbus electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 chapter 5 smbus slave interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1 system management bus interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1.1 smbus start bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1.2 smbus address and rd / wr bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1.3 smbus data bytes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.1.4 smbus ack and nack bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.1.5 smbus stop bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.1.6 smbus time-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.1.7 smbus and i 2 c compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.2 smbus protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.2.1 write byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2.2 read byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2.3 send byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2.4 receive byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.2.5 block write. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.2.6 block read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.2.7 alert response address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1 chapter 6 product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.1 critical/thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.1.1 sys_shdn pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.1.2 shdn_sel pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6.1.3 trip_set pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6.2 fan control modes of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 6.3 pwm fan driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.4 fan control look-up table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.4.1 programming the look up table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.4.2 dts support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.5 pwm input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.6 rpm-based fan speed control algorithm (fsc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6.6.1 programming the rpm-based fan speed control algorithm . . . . . . . . . . . . . . . . . . . . . 30 6.7 tachometer measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6.7.1 stalled fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6.7.2 aging fan or invalid drive detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6.8 spin up routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6.9 ramp rate control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6.10 watchdog timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 6.10.1 power up operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 6.10.2 continuous operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 6.11 fault queue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 6.12 aler t pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 4 ? 2013 microchip technology inc. 6.13 temperature monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 6.13.1 dynamic averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 6.13.2 resistance error correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5 6.13.3 beta compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.13.4 ideality configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.13.5 digital averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.14 diode connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.14.1 anti-parallel diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.14.2 diode faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 chapter 7 fan control register set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 7.1 register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 7.1.1 lock entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.2 temperature data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7.3 critical/thermal shutdown temperature register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.4 pushed temperature registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.5 pwm input duty cycle register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.6 trip_set voltage register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.7 ideality factor registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.8 beta configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 7.9 rec configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 7.10 critical temperature limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 7.11 configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 7.12 configuration 2 register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 7.13 interrupt status register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 7.14 error status registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 7.14.1 tcrit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 7.15 fan status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 7.16 interrupt enable register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 7.17 fan interrupt enable register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 7.18 pwm driver configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 7.19 pwm driver base frequency register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 7.20 limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 7.21 pwm input duty cycle high limit register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 7.22 fan setting registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7.23 pwm divide register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7.24 fan configuration 1 register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7.25 fan configuration 2 register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 7.26 gain register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 7.27 fan spin up configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 7.28 fan step register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 7.29 fan minimum drive register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 7.30 valid tach count register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 7.31 fan drive fail band registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 7.32 tach target register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 7.33 tach reading register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 7.34 look up table configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 7.35 look up table registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7.36 software lock register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 7.37 product features register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 7.38 product id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 7.39 manufacturer id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 7.40 revision register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 5 chapter 8 typical operating curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 chapter 9 package drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9.1 EMC2113 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9.2 package markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 appendix a look up table operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 a.1 example #1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 a.1.1 lut configuration bit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 a.2 example #2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 a.2.1 fan spin up configuration bit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 a.2.2 lut configuration - bit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 a.3 example #3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 a.3.1 lut configuration bit description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 datasheet revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 6 ? 2013 microchip technology inc. table of figures figure 1.1 EMC2113 block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 3.1 EMC2113-1 pin diagram (16-pin qfn). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 figure 5.1 smbus timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 6.1 system diagram for EMC2113 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 6.2 block diagram of critical/thermal shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 figure 6.3 fan control look-up table example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 figure 6.4 spin up routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 figure 6.5 ramp rate control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 figure 6.6 diode connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 figure 9.1 16-pin qfn 4mm x 4mm package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 figure 9.2 16-pin qfn 4mm x 4mm pcb footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 figure 9.3 16-pin qfn 4mm x 4mm package drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 figure 9.4 EMC2113 package markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 7 list of tables table 2.1 lut options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 3.1 pin description for EMC2113-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 3.2 pin types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 4.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4.2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 4.3 smbus electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 5.1 addr_sel pin decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 5.2 protocol format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 5.3 write byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 5.4 read byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 5.5 send byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 5.6 receive byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 5.7 block write protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 5.8 block read protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 5.9 alert response address protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 6.1 shdn_sel pin decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 6.2 trip_set resistor setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 6.3 fan controls active for operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 6.4 dynamic averaging behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 table 7.1 EMC2113 register set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 table 7.2 temperature data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 table 7.3 temperature data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 table 7.4 critical/thermal shutdown temperature register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 table 7.5 critical/thermal shutdown data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 table 7.6 pushed temperature registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 table 7.7 pwm duty cycle register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 table 7.8 trip_set voltage register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 table 7.9 ideality factor registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 table 7.10 ideality factor look-up table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 table 7.11 substrate diode ideality factor look-up table (bjt model) . . . . . . . . . . . . . . . . . . . . . . . . . 47 table 7.12 beta configuration register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 table 7.13 beta compensation look up table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 table 7.14 rec configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 table 7.15 limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 table 7.16 configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 table 7.17 configuration 2 register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 table 7.18 fault queue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 table 7.19 conversion rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 table 7.20 interrupt status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 table 7.21 error status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 table 7.22 fan status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 table 7.23 interrupt enable register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 table 7.24 fan interrupt enable register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 table 7.25 pwm driver configuration register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 table 7.26 pwm driver base frequency register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 table 7.27 pwm_basex[1:0] it decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 table 7.28 limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 table 7.29 pwm duty cycle high limit register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 table 7.30 fan driver setting register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 table 7.31 pwm divide register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 table 7.32 fan configuration 1 register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 table 7.33 range decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 table 7.34 minimum edges for fan rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 8 ? 2013 microchip technology inc. table 7.35 update time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 table 7.36 fan configuration 2 register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 table 7.37 derivative options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 table 7.38 error range options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 table 7.39 gain register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 table 7.40 gain decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 table 7.41 fan spin up configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 table 7.42 drive_fail_cnt[1:0] bit decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 table 7.43 spin level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 table 7.44 spin time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 table 7.45 fan step register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 table 7.46 minimum fan drive register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 table 7.47 valid tach count register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 table 7.48 fan drive fail band registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 table 7.49 tach target register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 table 7.50 tach reading register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 table 7.51 look up table configuration register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 table 7.52 look up table registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 table 7.53 software lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 table 7.54 product features register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 table 7.55 addr_sel[2:0] encoding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 table 7.56 shdn_sel[2:0] encoding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 table 7.57 product id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 table 7.58 manufacturer id register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 table 7.59 revision register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 table a.1 look up table format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 table a.2 look up table example #1 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 table a.3 fan speed control table example #1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 table a.4 fan speed determination for example #1 (using settings in table a.3 ) . . . . . . . . . . . . . . . . . 82 table a.5 look up table example #2 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 table a.6 fan speed control table example #2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 table a.7 fan speed determination for example #2 (using settings in table a.6 ) . . . . . . . . . . . . . . . . . 84 table a.8 look up table example #3 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 table a.9 fan speed control table example #3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 table a.10 fan speed determination for example #2 (using settings in table a.9 ) . . . . . . . . . . . . . . . . . 85 revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 9 chapter 1 block diagram figure 1.1 EMC2113 block diagram
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 10 ? 2013 microchip technology inc. chapter 2 delta from emc2103 the EMC2113 is compatible with the emc2103-2 with the following changes: ? removed two gpios - pins 4 and 5 of the emc2103-2 were gpio pins. these have been removed. ? added pwm input functionality - this functionality allows the user to drive a pwm input into the EMC2113. the duty cycle of the pwm represents a temperature value and can be used as an input to the fan control look up table. ? added addr_sel functionality - this functionality allows the user to choose one of six smbus address options. ? updated hysteresis within look up table - the fan control look up table in the EMC2113 allows the user to program a different hysteresis value to apply to each temperature input channel instead of a single hysteresis value that applies to all temperature input channels. ? updated input muxing for the look up table - the fan control look up table has more options over which temperature channel is used for fan control. ? updated hw set shutdown functionality to include option for internal diode ? added control to disable ramp rate control if one or more temperatures exceed the high limit ? added smbus block read and write capability table 2.1 lut options temperature input EMC2113 options temperature column 1 external diode 1 -or- pushed temperature 1 temperature column 2 external diode 2 temperature column 3 external diode 3 -or- pushed temperature 1 temperature column 4 internal diode -or- pushed temperature 2
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 11 chapter 3 pin layout figure 3.1 EMC2113-1 pin diagram (16-pin qfn) table 3.1 pin description for EMC2113-1 pin number pin name pin function pin type 1 dn1 negative (cathode) analog input for external diode 1 aio 2 dp1 positive (anode) analog input for external diode 1 aio 3 vdd power supply power 4 pwm_in pwm input signal from host di (5v) 5 addr_sel address select input aio 6 aler t active low smbus slave interrupt - requires external pull-up resistor. od (5v) 7 sys_shdn active low critical/thermal shutdown output - requires external pull-up resistor od (5v)
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 12 ? 2013 microchip technology inc. the pin types are described in detail below. all pins labelled with (5v) are 5v tolerant. note: for all 5v tolerant pins that require a pull-up resistor, the pull-up voltage cannot exceed 3.6v when the device is unpowered. 8 smdata smbus data input/output - requires external pull-up resistor diod (5v) 9 smclk smbus clock input - requires external pull-up resistor di (5v) 10 tach tachometer input for the fan di (5v) 11 pwm pwm - open drain pwm drive output for the fan (default) od (5v) pwm - push pull pwm drive output for the fan do 12 gnd ground power 13 shdn_sel selects the hardware shutdown channel and operating mode aio 14 trip_set voltage input to set the critical/thermal shutdown threshold aio 15 dn2 / dp3 dn2 - negative (cathode) connection for external diode 2 aio dp3 - positive (anode) connection for external diode 3 aio 16 dp2 / dn3 dp2 - positive (anode connection for external diode 2 aio dn3 - negative (cathode) connection for external diode 3 aio table 3.2 pin types pin type description power this pin is used to supply power or ground to the device. di digital input - this pin is used as a digital input. this pin is 5v tolerant. aio analog input / output - this pin is used as an i/o for analog signals. do push / pull digital output - this pin is used as a digital output. it can both source and sink current. dio digital input / output this pin is used as a digital i/o. it can both source and sink current. od open drain digital output - this pin is used as a digital output. it is open drain and requires a pull-up resistor. this pin is 5v tolerant. table 3.1 pin description for EMC2113-1 (continued) pin number pin name pin function pin type
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 13 chapter 4 electrical characteristics note: stresses above those listed could cause permanent damage to the device. this is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied. when powering this device from laboratory or system power supplies, it is important that the absolute maximum ratings not be exceeded or device failure can result. some power supplies exhibit voltage spikes on their outputs when the ac power is switched on or off. in addition, voltage transients on the ac power line may appear on the dc output. if this possibility exists, it is suggested that a clamp circuit be used. note: all voltages are relative to ground. note: ? ja numbers are based on a recommended four 12 mil vias connecting the thermal pad to pcb ground. note 4.1 for the 5v tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed 3.6v when the EMC2113 is unpowered. table 4.1 absolute maximum ratings voltage on 5v tolerant pins (v pullup ) -0.3 to 5.5 v voltage on 5v tolerant pins (|v pullup - v dd |) see note 4.1 0 to 3.6 v voltage on vdd pin -0.3 to 4 v voltage on any other pin to gnd -0.3 to v dd + 0.3 v package power dissipation 0.8w up to t a = 85c w junction to ambient ( ? ja ) 50 c/w operating ambient temperature range -40 to 125 c storage temperature range -55 to 150 c esd rating, all pins, hbm 2000 v
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 14 ? 2013 microchip technology inc. 4.1 electrical specifications table 4.2 electrical specifications vdd = 3v to 3.6v, t a = -40c to 125c, all typical values at t a = 27c unless otherwise noted. characteristic symbol min typ max unit conditions dc power supply voltage v dd 3 3.3 3.6 v supply current i dd 1.1 1.5 ma 4 conversions/second, fan driver active at maximum pwm frequency, dynamic averaging enabled 0.7 1.1 ma 1 conversion/second, fan driver not active, dynamic averaging disabled first conversion ready t conv_t 150 300 ms time after power up before all channels updated smbus delay t smb_d 10 15 ms time before smbus communications should be sent by host external temperature monitors temperature accuracy 0.5 1 c 60c < t diode < 125c 30c < t a < 100c 1 2 c -40c < t diode < 125c temperature resolution 0.125 c diode decoupling capacitor c filter 2200 2700 pf connected across external diode, cpu, gpu, or amd diode resistance error corrected r series 100 ohm sum of series resistance in both dp and dn lines internal temperature monitor temperature accuracy t a 0.5 1 c 40c < t a < 100c 1 2 c temperature resolution 0.125 c rpm-based fan controller tachometer range tach 480 16000 rpm rpm control accuracy ? tach 1 2 % pwm fan driver pwm resolution pwm 256 steps pwm duty cycle duty 0 100 %
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 15 4.2 smbus electrical specifications pwm input detection pwm frequency f pwm_in 150 40k hz trip_set measurement trip_set decode accuracy v trip 0.5 1 c 1% resistor connected to ground trip_set decode accuracy v trip 1 2 c 5% resistor connected to ground digital i/o pins input high voltage v ih 2.0 v input low voltage v il 0.8 v output high voltage v oh vdd - 0.4 v 8 ma current drive output low voltage v ol 0.4 v 8 ma current sink leakage current i leak 5 ua aler t and sys_shdn pins device powered or unpowered t a < 85c table 4.3 smbus electrical specifications vdd= 3v to 3.6v, t a = -40c to 125c typical values are at t a = 27c unless otherwise noted. characteristic symbol min typ max units conditions smbus interface input high/low current i ih / i il 5 ua device powered or unpowered t a < 85c input capacitance c in 410 pf smbus timing clock frequency f smb 10 400 khz spike suppression t sp 50 ns bus free time start to stop t buf 1.3 us setup time: start t su:sta 0.6 us setup time: stop t su:stp 0.6 us data hold time t hd:dat 0.6 6 us data setup time t su:dat 0.6 72 us table 4.2 electrical specifications (continued) vdd = 3v to 3.6v, t a = -40c to 125c, all typical values at t a = 27c unless otherwise noted. characteristic symbol min typ max unit conditions
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 16 ? 2013 microchip technology inc. clock low period t low 1.3 us clock high period t high 0.6 us clock/data fall time t fall 300 ns min = 20+0.1c load ns clock/data rise time t rise 300 ns min = 20+0.1c load ns capacitive load c load 400 pf total per bus line table 4.3 smbus electrical specifications (continued) vdd= 3v to 3.6v, t a = -40c to 125c typical values are at t a = 27c unless otherwise noted. characteristic symbol min typ max units conditions
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 17 chapter 5 smbus slave interface the EMC2113 communicates with a host controller, such as an sio, through the smbus. the smbus is a two-wire serial communication protocol between a computer host and its peripheral devices. 5.1 system management bus interface protocol the EMC2113 contains an smbus slave interface. a detailed timing diagram is shown in figure 5.1, "smbus timing diagram" . stretching of the smclk signal is supported, however the EMC2113 will not stretch the clock signal. 5.1.1 smbus start bit the smbus start bit is defined as a transition of the smbus data line from a logic ?1? state to a logic ?0? state while the smbus clock line is in a logic ?1? state. 5.1.2 smbus address and rd / wr bit the smbus address byte consists of the 7-bit slave address followed by the rd / wr indicator bit. if this rd / wr bit is a logic ?0?, then the host device is writing data to the slave device. if this rd / wr bit is a logic ?1?, then the host device is reading data from the slave device. the EMC2113 smbus slave address is determined via the pull-up resistor connected to the addr_sel pin as shown table 5.1, "addr_sel pin decode" . figure 5.1 smbus timing diagram table 5.1 addr_sel pin decode pull-up resistor value fan control address 4.7k ohm 5% 0101_100(r/w) 6.8k ohm 5% 0101_101(r/w) 10k ohm 5% 0101_110(r/w) 15k ohm 5% 1001_100(r/w)
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 18 ? 2013 microchip technology inc. 5.1.3 smbus data bytes all smbus data bytes are sent most significant bit first and composed of 8-bits of information. 5.1.4 smbus ack and nack bits the smbus slave will acknowledge all data bytes that it receives. this is done by the slave device pulling the smbus data line low after the 8th bit of each byte that is transmitted. the host will nack (not acknowledge) the last data byte to be received from the slave by holding the smbus data line high after the 8th data bit has been sent. 5.1.5 smbus stop bit the smbus stop bit is defined as a transition of the smbus data line from a logic ?0? state to a logic ?1? state while the smbus clock line is in a logic ?1? state. when the EMC2113 detects an smbus stop bit, and it has been communicating with the smbus protocol, it will reset its slave interface and prepare to receive further communications. 5.1.6 smbus time-out the EMC2113 includes an smbus time-out feature. following a 30ms period of inactivity on the smbus, the device will time-out and reset the smbus interface. the smbus timeout defaults to enabled and can be disabled by setting the dis_to bit (see section 7.12, "configuration 2 register" ). 5.1.7 smbus and i 2 c compliance the major difference between smbus and i 2 c devices is highlighted here. for complete compliance information refer to the smbus 2.0 specification. 1. minimum frequency for smbus communications is 10khz. 2. the slave protocol will reset if the clock is held low longer than 30ms. 3. the slave protocol will reset if both the clock and the data line are high for longer than 150us (idle condition). 4. i 2 c devices do not support the alert response address functionality (which is optional for smbus). 5.2 smbus protocols the EMC2113 slave interface is smbus 2.0 compatible and support send byte, read byte, receive byte, write byte, block read byte, block write byte, and the alert response address as valid protocols. these protocols are used as shown below. all of the below protocols use the convention in table 5.2, "protocol format" . for the slave address fields, the value of yyyy_yyy represents the programmed smbus address. 22k ohm 5% 1001_101(r/w) 33k ohm 5% 1001_000(r/w) table 5.1 addr_sel pin decode (continued) pull-up resistor value fan control address
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 19 5.2.1 write byte the write byte is used to write one byte of data to the registers as shown below table 5.3 . 5.2.2 read byte the read byte protocol is used to read one byte of data from the registers as shown in table 5.4 . 5.2.3 send byte the send byte protocol is used to set the intern al address register pointer to the correct address location. no data is transferred during the send byte protocol as shown in table 5.5 . table 5.2 protocol format data sent to device data sent to the host # of bits sent # of bits sent table 5.3 write byte protocol start slave address wr ack register address ack register data ack stop 1 -> 0 yyyy_yyy 0 0 0 -> 1 0 xxh 0 0 -> 1 table 5.4 read byte protocol start slave address wr ack register address ack start slave address rd ack register data nack stop 1 -> 0 yyyy_yyy 0 0 xxh 0 1 -> 0 yyyy_yyy 1 0 xxh 1 0 -> 1 table 5.5 send byte protocol start slave address wr ack register address ack stop 1 -> 0 yyyy_yyy 0 0 xxh 1 0 -> 1
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 20 ? 2013 microchip technology inc. 5.2.4 receive byte the receive byte protocol is used to read data from a register when the internal register address pointer is known to be at the right location (e.g. set via send byte). this is used for consecutive reads of the same register as shown in table 5.6 . 5.2.5 block write the block write is used to write multiple data bytes to a group of contiguous registers as shown in table 5.7 . it is an extension of the write byte protocol. 5.2.6 block read the block read is used to read multiple data bytes from a group of contiguous registers as shown in table 5.8 . it is an extension of the read byte protocol. table 5.6 receive byte protocol start slave address rd ack register data nack stop 1 -> 0 yyyy_yyy 1 0 xxh 1 0 -> 1 table 5.7 block write protocol start slave address wr ack register address ack register data ack 1 ->0 yyyy_yyy 0 0 xxh 0 xxh 0 register data ack register data ack . . . register data ack stop xxh 0 xxh 0 . . . xxh 0 0 -> 1 table 5.8 block read protocol start slave address wr ack register address ack start slave address rd ack register data 1->0 yyyy_yyy 0 0 xxh 0 1 ->0 yyyy_yyy 1 0 xxh ack register data ack register data ack register data ack . . . register data nack stop 0 xxh 0 xxh 0 xxh 0 . . . xxh 1 0 -> 1
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 21 5.2.7 alert response address the aler t output can be used as a processor interrupt or as an smbus alert when configured to operate as an interrupt. when it detects that the aler t pin is asserted, the host will send the alert response address (ara) to the general address of 0001_100b. all devices with active interrupts will respond with their slave address as shown in table 5.9 . the EMC2113 slave interface will respond to the ara in the following way if the aler t pin is asserted. 1. send slave address and verify that full slave address was sent (i.e. the smbus communication from the device was not prematurely stopped due to a bus contention event). 2. set the mask bit to clear the aler t pin. table 5.9 alert response address protocol start alert response address rd ack device address nack stop 1 -> 0 0001_100 1 0 yyyy_yyy 1 0 -> 1
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 22 ? 2013 microchip technology inc. chapter 6 product description the EMC2113 is an smbus compliant fan controller with up to three (3) external and one (1) internal temperature channels. the fan driver can be operated using two methods, each with two modes. the methods include an rpm-based fan speed control algorithm and a direct pwm drive setting. the modes include manually programming the desired settings or using the internal programmable temperature look-up table to select the desired setting based on measured temperature. the temperature monitors offer 1c accuracy (for external diodes) with sophisticated features to reduce errors introduced by series resistance and beta variation of substrate thermal diode transistors commonly found in processors (including support of the bjt or transistor model for a cpu diode). the EMC2113 allows the user to program temperatures generated from external sources to control the fan speed. this functionality also supports dts data from the cpu. by pushing dts or standard temperature values into dedicated registers, the external temperature readings can be used in conjunction with the external diode(s) and internal diode to control the fan speed. the EMC2113 also allows the user to input a pwm input signal on the pwm_in pin that is used as an input to the fan speed control look up table. the EMC2113 includes a hardware programmable temperature limit and dedicated system shutdown output for thermal protection of critical circuitry. figure 6.1 shows a system diagram of the EMC2113. figure 6.1 system diagram for EMC2113
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 23 6.1 critical/thermal shutdown the EMC2113 provides a hardware critical/thermal shutdown function for systems. figure 6.2 is a block diagram of this critical/thermal shutdown function. the critical/thermal shutdown function accepts configuration information from the pullup resistor of the shdn_sel pin. the analog portion of the critical/thermal shutdown function monitors the hardware determined shutdown channel. this measured temperature is then compared with trip_set point. this trip_set point is set by the system designer with a single external resistor. the s y s _ s h d n is asserted when the indicated temperature meets or exceeds the temperature threshold (t trip ) established by the trip_set input pin for a number of consecutive measurements defined by the fault queue. each of the software programmed temperature limits can be optionally configured to act as inputs to the critical/thermal shutdown independent of the hardware shutdown operation. when configured to operate this way, the sys_shdn pin will be asserted when the temperature meets or exceeds the programmed tcrit limit for the enabled channel (see section 7.10 ). 6.1.1 sys_shdn pin the sys_shdn pin is an active low dedicated system interrupt. this pin is asserted low when: 1. the programmed temperature channel (see section 6.1.2 ) exceeds the hardware set limit (see section 6.1.3 ). 2. any of the measured temperature channels meet or exceed their programmed tcrit limits and have been linked to the sys_shdn pin (see section 7.10 ). 3. any of the measured temperature channels meet or exceed their programmed high limits and have been linked to the sys_shdn pin (see section 7.11 ). figure 6.2 block diagram of critical/thermal shutdown
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 24 ? 2013 microchip technology inc. when the sys_shdn pin is asserted, it will remain asserted until the measured temperatures drop below the respective limits minus the hysteresis. at this point, the pin will be released automatically. 6.1.2 shdn_sel pin the EMC2113 has a ?strappable? input (shdn_sel) allowing for configuration of the hardware critical/thermal shutdown input channel. the pull-up resistor used on this pin identifies which configuration setting is used as shown in table 6.1, "shdn_sel pin decode" . . application note: the shdn_sel pin decode settings with beta compensation enabled (auto) will support a diode connected 2n3904 diode normally. 6.1.3 trip_set pin the EMC2113?s trip_set pin is an analog input to the critical/thermal shutdown block which sets the thermal shutdown temperature. the system designer creates a voltage level at the input through a simple resistor connected to gnd as shown in figure 6.2, "block diagram of critical/thermal shutdown" . the value of this resistor is used to create an input voltage on the trip_set pin which is translated into a temperature ranging from 65c to 127c. application note: current only flows when the trip_set pin is being monitored. at all other times, the internal reference voltage is removed and the trip_set pin will be pulled down to ground. table 6.1 shdn_sel pin decode pull up resistor mode / diode channel external diode 1 config external diode 2 config < 4.7k ohm amd cpu on external diode 1 beta compensation disabled rec disabled beta and rec controls are locked beta compensation enabled (auto) rec enabled beta and rec controls are not locked 6.8k ohm 2n3904 on external diode 1 beta compensation disabled rec enabled beta and rec controls are locked beta compensation enabled (auto) rec enabled beta and rec controls are not locked 10k ohm intel cpu or 2n3904 on external diode 1 beta compensation enabled (auto) rec enabled beta and rec controls are locked beta compensation enabled (auto) rec enabled beta and rec controls are not locked 15k ohm internal diode beta compensation enabled (auto) rec enabled beta and rec controls are not locked beta compensation enabled (auto) rec enabled beta and rec controls are not locked 22k ohm intel cpu or 2n3904 on external diode 2 beta compensation enabled (auto) rec enabled beta and rec controls are not locked beta compensation enabled (auto) rec enabled beta and rec controls are locked > 33k ohm intel cpu or 2n3904 on external diode 1 beta compensation enabled (auto) rec enabled beta and rec controls are not locked beta compensation enabled (auto) rec enabled beta and rec controls are not locked
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 25 application note: the trip_set pin circuitry is designed to use a 1% resistor externally. using a 1% resistor will result in the thermal / critical shutdown temperature being decoded correctly. if a 5% resistor is used, then the thermal / critical shutdown temperature may be decoded with as much as 1c error. table 6.2 trip_set resistor setting t trip (c) rset (1%) t trip (c) rset (1%) 65 0.0 97 1240 66 28.7 98 1330 67 48.7 99 1400 68 69.8 100 1500 69 90.9 101 1580 70 113 102 1690 71 137 103 1820 72 158 104 1960 73 182 105 2050 74 210 106 2210 75 237 107 2370 76 261 108 2550 77 294 109 2740 78 324. 110 2940 79 348 111 3160 80 383 112 3480 81 412 113 3740 82 453 114 4120 83 487 115 4530 84 523 116 4990 85 562 117 5490 86 604 118 6040 87 649 119 6810 88 698 120 7870 89 750 121 9090 90 787 122 10700 91 845 123 12700 92 909 124 15800 93 953 125 20500
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 26 ? 2013 microchip technology inc. 6.2 fan control modes of operation the EMC2113 has four modes of operation for the fan driver. each mode uses ramp rate control and the spin up routine. 1. pwm setting mode - in this mode of operation, the user directly controls the pwm duty cycle setting. updating the fan driver setting register (see section 7.22, "fan setting registers" ) will instantly update the fan drive. the driver uses the spin up routine and has user definable ramp rate controls. ? this is the default mode. the pwm setting mode is enabled by clearing both the en_algo bit in the fan configuration register (see section 7.24 ) and the lut_lock bit in the look up table configuration register (see section 7.34 ). ? whenever the pwm setting mode is enabled, the current drive will be changed to what was last written into the fan driver setting register. ? the ramp rate is controlled by the settings of the max step register (see section 7.28 ) and update period controls ( section 7.24 ) and must be enabled via the en_rrc bit (see section 7.25 ). 2. fan speed control mode (fsc) - in this mode of operation, the user determines a fan speed and the drive setting is automatically updated to achieve this target speed. the algorithm uses the spin up routine and has user definable ramp rate controls. ? this mode is enabled by clearing the lut_lock bit in the look up table (lut) configuration register and setting the en_algo bit in the fan configuration register. 3. using the look up table with fan drive settings (pwm setting w/ lut mode) - in this mode of operation, the user programs the look up table with pwm duty cycle settings and corresponding temperature thresholds. the fan drive is set based on the measured temperatures and the corresponding drive settings. the fan driver uses the spin up routine and has user definable ramp rate controls. ? this mode is enabled by programming the look up table then setting the lut_lock bit while the en_algo bit is set to ?0?. ? the rpm / pwm bit in the look up table configuration register must be set to ?1? or the pwm drive settings will be incorrectly set. 4. using the look up table with fan speed control algorithm (fsc w/ lut mode)- in this mode of operation, the user programs the look up table with fan speed target values and corresponding temperature thresholds. the tach target register will be set based on the measured temperatures and the corresponding target settings. the pwm drive settings will be determined automatically based on the rpm-based fan speed control algorithm. pwm drive settings will be determined automatically based on the rpm-based fan speed control algorithm ? this mode is enabled by programming the look up table then setting the lut_lock bit while the en_algo bit is set to ?1?. ? the rpm / pwm bit in the look up table configuration register must be set to ?0? or the tach target values will be incorrectly set. application note: it is important that the tach target settings are in the proper format when using the rpm- based fan speed control algorithm. 94 1020 126 29400 95 1100 127 49900 96 1150 65 open table 6.2 trip_set resistor setting (continued) t trip (c) rset (1%) t trip (c) rset (1%)
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 27 6.3 pwm fan driver the EMC2113 supports a high or low frequency pwm driver. the output can be configured as either push-pull or open drain and the frequency ranges from 9.5hz to 26khz in four programmable frequency bands. the pwm frequency range is coarsely adjusted via the pwm base frequency register ( section 7.19 ) with a fine tune adjustment performed via the pwm divider registers (see section 7.23 ). general pwm operation is governed by the pwm configuration register (see section 7.18 ). 6.4 fan control look-up table the EMC2113 uses a look-up table to apply a user-programmable fan control profile based on measured temperature to the fan driver. in this look-up table, each temperature channel is allowed to control the fan drive output independently (or jointly) by programming up to eight pairs of temperature and drive setting entries. the look up table supports external data pushed into the device by the host in either dts or standard format. each of the four temperature channels used by the look up table is generated from measured temperature sensors on the EMC2113 or from an external source. table 6.3 fan controls active for operating mode direct pwm setting mode fsc mode direct pwm setting w/ lut mode fsc w/ lut mode fan driver setting (read / write) fan driver setting (read only) fan driver setting (read only) fan driver setting (read only) edges[1:0] edges[1:0] (fan configuration) edges[1:0] edges[1:0] - range[1:0] (fan configuration) - range[1:0] (fan configuration) update[2:0] (fan configuration) update[2:0] (fan configuration) update[2:0] (fan configuration) update[2:0] (fan configuration) level (spin up configuration) level (spin up configuration) level (spin up configuration) level (spin up configuration) spinup_time[1:0] (spin up configuration) spinup_time[1:0] (spin up configuration) spinup_time[1:0] (spin up configuration) spinup_time[1:0] (spin up configuration) fan max step fan max step fan max step fan max step - fan minimum drive fan minimum drive valid tach count valid tach count valid tach count valid tach count - tach target (read / write) - tach target (read only) tach reading tach reading tach reading tach reading - - look up table drive / temperature settings (read only) look up table drive / temperature settings (read only) - drive_fail_cnt [1:0] (spin up configuration) + fan drive fail band - drive_fail_cnt [1:0] (spin up configuration) + fan drive fail band
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 28 ? 2013 microchip technology inc. the user programs the look-up table based on the desired operation. if the rpm-based fan speed control algorithm is to be used (see section 6.6, "rpm-based fan speed control algorithm (fsc)" ), then the user must program a fan speed target for each temperature setting of interest. alternately, if the rpm-based fan speed control algorithm is not to be used, then the user must program a pwm setting for each temperature setting of interest. if the measured temperature on the external diode channel meets or exceeds any of the temperature thresholds for any of the channels, the fan output will be automatically set to the desired setting corresponding to the exceeded temperature. in cases where multiple temperature channel thresholds are exceeded, the highest fan drive setting will take precedence. figure 6.3, "fan control look-up table example" shows an example of this behavior using a single channel. when the measured temperature drops to a point below a lower threshold minus the hysteresis value, the fan output will be set to the corresponding lower set point. to turn the fan off, there are 2 methods: ? the first is to set the temps1-4 setting 1 values (+ hysteresis) above the temperatures desired for the fan to turn off. when the temperatures fall below temps1-4 (out of the lut) by the hysteresis amount, the fan drive will be set to 0. ? the second is to set the drive 1 value to 0% (or 0rpm) as well as the temp 1-4 values to the temperatures (+ hysteresis) at which the fan should turn off. this method will reduce the effective amount of fan drive settings to 7. figure 6.3 fan control look-up table example
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 29 6.4.1 programming the look up table when the look up table is used, it must be loaded and configured correctly based on the system requirements. the following steps outline the procedure. 1. determine whether the look up table will drive a pwm duty cycle or a tachometer target value and set the rpm / pwm bit in the fan lut configuration register (see section 7.34, "look up table configuration register" ). 2. determine which measurement channels (up to four) are to be used with the look up table and set the temp1_cfg, temp3_cfg and temp4_cfg bits accordingly in the fan lut configuration register. 3. for each step to be used in the lut, set the fan setting (either pwm or tach target as set by the rpm / pwm bit). if a setting is not used, then set it to ffh (if a pwm) or 00h (if a tach target). load the lowest settings first in ascending order (i.e. fan setting 1 is the lowest setting greater than ?off?. fan setting 2 is the next highest setting, etc.). see section 7.35, "look up table registers" . 4. for each step to be used in the lut, set each of the measurement channel thresholds. these values must be set in the same data format that the data is presented. if dts is to be used, then the format should be in temperature with a maximum threshold of 100c (64h). if a measurement channel is not used, then set the threshold at ffh. 5. update the threshold hysteresis to be smaller than the smallest table step. 6. configure the rpm-based fan speed control algorithm if it is to be used. see section 7.24, "fan configuration 1 register" for more details. 7. set the lut_lock bit to enable the look up table and begin fan control in the fan lut configuration register. 6.4.2 dts support the EMC2113 supports dts (intel?s digital temperature sensor) data in the fan control look up table. intel?s dts data is a positive number that represents the processor?s relative temperature below a fixed value called t control which is generally equal to 100c for intel mobile processors. for example, a dts value of 10c means that the actual processor temperature is 10c below t control or equal to 90c. either or both of the pushed temperature registers can be written with dts data and used to control the fan driver. when dts data is entered, then the use_dts_fx bit must be set in the fan lut configuration register. once this bit is set, the dts data entered is automatically subtracted from a value of 100c. this delta value is then used in the look up table as standard temperature data. application note: the device is designed with the assumption that t control is 100c. as such, all dts related conversions are done based on this value including look up table comparisons. if t control is adjusted (i.e. t control is shifted to 105c), then all of the look up table thresholds should be adjusted by a value equal to t control - 100c. 6.5 pwm input the EMC2113 supports a pwm input that is used as an input to the fan speed control look up table. this is controlled by the push1_cfg bit and either the temp1_cfg or temp3_cfg bits in the look up table configuration register (see section 7.34 ). when a signal is driven into the pwm_in pin, then the device will automatically calculate the duty cycle of the input signal (provided that the frequency is within the specified range). this value is stored in the pwm input duty cycle register and may be used as an input to the look up table. application note: the pwm input duty cycle value is a unit-less value that does not correspond to specific temperature values. when used in the fan control lut, it is compared against unit-less 7- bit values that represent pwm duty cycle thresholds to control the desired fan speed.
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 30 ? 2013 microchip technology inc. this functionality is always active. if the pin does not transition, then it will assume 100% duty cycle or 0% duty cycle based on the pin voltage. the data range required by the look up table is 0 to 127 so 100% duty cycle corresponds to 127 and 0% corresponds to 0. the duty cycle measured on the pwm_in pin is compared against a user programmed pwm high limit. if the measured duty cycle meets or exceeds this value, then it may cause the aler t pin to be asserted (default operation is to mask this event from asserting the aler t pin). 6.6 rpm-based fan speed control algorithm (fsc) the EMC2113 includes an rpm-based fan speed control algorithm. this fan control algorithm uses proportional, integral, and derivative terms to automatically approach and maintain the system?s desired fan speed to an accuracy directly proportional to the accuracy of the clock source. the desired tachometer count is set by the user inputting the desired number of 32.768khz cycles that occur per fan revolution. this is done either manually or by programming the temperature look- up table. the user may change the target count at any time. the user may also set the target count to ffh in order to disable the fan driver for lower current operation. for example, if a desired rpm rate for a 2-pole fan is 3000 rpm then the user would input the hexidecimal equivalent of 1296 (51h in the tach target register). this number represents the number of 32.768khz cycles that would occur during the time it takes the fan to complete a single revolution when it is spinning at 3000rpms. the EMC2113?s rpm-based fan speed control algorithm has programmable configuration settings for parameters such as ramp-rate control and spin up conditions. the fan driver automatically detects and attempts to alleviate a stalled/stuck fan condition while also asserting the a l e r t pin. the EMC2113 works with fans that operate up to 16,000 rpms and provide a valid tachometer signal. 6.6.1 programming the rpm-based fan speed control algorithm the rpm-based fan speed control algorithm powers-up disabled. the following registers control the algorithm. the EMC2113 fan control registers are pre-loaded with defaults that will work for a wide variety of fans so only the tach target register is required to set a fan speed. the other fan control registers can be used to fine-tune the algorithm behavior based on application requirements. note that steps 1 - 7 are optional and need only be performed if the default settings do not provide the desired fan response. 1. set the valid tach count register to maximum number of tach counts to indicate the fan is spinning. 2. set the spin up configuration register to the spin up level and spin time desired. 3. set the fan step register to the desired step size. 4. set the fan minimum drive register to the minimum drive value that will maintain fan operation. 5. set the update time and edges options in the fan configuration register. 6. set the tach target register to the desired tachometer count. 7. enable the rpm-based fan speed control algorithm by setting the en_algo bit. 6.7 tachometer measurement the tachometer measurement circuitry is used in conjunction with the rpm-based fan speed control algorithm to update the fan driver output. additiona lly, it can be used in direct setting mode as a diagnostic for host based fan control.
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 31 the EMC2113 monitors the tach signal in real time. it constantly updates the tachometer measurement by reporting the number of clocks between a user programmed number of edges on the tach signal (see table 7.34, "minimum edges for fan rotation" ). using the tach period measurement method provides fast response times for the rpm-based fan speed control algorithm and the data is presented as a count value that represents the fan rpm period. when this method is used, all fan target values must be input as a count value for proper operation. application note: the tach period measurement method works independently of the drive settings. if the device is put into direct setting and the fan drive is set at a level that is lower than the fan can operate (including zero drive), then the tachometer measurement may signal a stalled fan condition and assert an interrupt. 6.7.1 stalled fan a stalled fan is detected if the tach counter exceeds the user-programmable valid tach count setting. the EMC2113 will flag the fan as stalled and trigger an interrupt. if the rpm-based fan speed control algorithm is enabled, the algorithm will automatically attempt to restart the fan until it detects a valid tachometer level or is disabled. the fan_stall status bit indicates that a stalled fan was detected. this bit is checked conditionally depending on the mode of operation. ? when the direct setting mode or direct setting with lut mode are enabled, the fan_stall interrupt will be masked for the duration of the programmed spin up time (see table 7.44, "spin time" ). this is to allow the fan opportunity to reach a valid speed without generating unnecessary interrupts. ? in direct setting mode or direct setting with lut mode, whenever the drive value is changed from 00h, the fan_stall interrupt will be masked for the duration of the programmed spin up time to allow the fan opportunity to reach a valid speed without generating unnecessary interrupts. ? in direct setting mode or direct setting w/ lut mode, and the tachometer measurement is using the tach period measurement method, then whenever the tach reading register value exceeds the valid tach count register setting, the fan_stall status bit will be set. ? when using the rpm-based fan speed control algorithm (either fsc mode or lut with fsc mode), the stalled fan condition is checked whenever the update time is met and the fan drive setting is updated. it is not a continuous check. 6.7.2 aging fan or invalid drive detection the EMC2113 contains circuitry that detects that the programmed fan speed can be reached by the fan. if the target fan speed cannot be reached within a user defined band of tach counts at maximum drive then the drive_fail status bit is set and the aler t pin is asserted. this is useful to detect aging fan conditions (where the fan?s natural maximum speed degrades over time) or incorrect fan speed settings. 6.8 spin up routine the EMC2113 also contains programmable circuitry to control the spin up behavior of the fan driver to ensure proper fan operation. the spin up routine is initiated under the following conditions when the tach period measurement method of tach measurement is used: this applies to both the rpm- based fan speed control algorithm mode, or direct setting mode (with or without the look up table - when enabled). 1. the tach target register value changes from a value of ffh to a value that is less than the valid tach count (see section 7.30, "valid tach count register" ). 2. the rpm-based fan speed control algorithm?s measured tach reading register value is greater than the valid tach count setting.
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 32 ? 2013 microchip technology inc. when the spin up routine is operating, the fan driver is set to full scale (optional) for one quarter of the total user defined spin up time. for the remaining spin up time, the fan driver output is set to a user defined level (30% through 65% drive). after the spin up routine has finished, the EMC2113 measures the tach signal. if the measured tach reading register value is higher than the valid tach count register setting, the fan_spin status bit is set and the spin up routine will automatically attempt to restart the fan. figure 6.4, "spin up routine" shows an example of the spin up routine in response to a programmed fan speed change based on the first condition above. 6.9 ramp rate control the pwm output drive can be configured with automatic ramp rate control. if the rpm-based fan speed control algorithm is used, then this ramp rate control is automatically used based on the fan control derivative option settings. the user programs a maximum step size for the pwm setting and an update time. the update time varies from 100ms to 1.6s while the pwm maximum step can vary from 1 pwm count to 31 pwm counts. when a new pwm duty cycle value is entered (either directly, as a result of the fsc algorithm adjusting the output pwm to meet the programmed tach target value, or as a result of the ramp rate control circuitry), the delta from the next pwm and the previous pwm is determined. if this delta is greater than the maximum fan step settings, then the pwm is adjusted by the maximum fan step settings. the pwm duty cycle is adjusted (and the delta recalculated) every 100ms to 1.6s as determined by the update time until the target pwm setting is reached. see figure 6.5, "ramp rate control" . figure 6.4 spin up routine
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 33 6.10 watchdog timer the EMC2113 contains an internal watchdog timer for the fan driver. the watchdog timer monitors the smbus traffic for signs of activity and works in two different modes based upon device operation. these modes are power up operation and continuous operation as described below. for either mode of operation, if four (4) seconds elapse without activity detected by the host, then the watchdog will be triggered and the following will occur: 1. the watch status bit will be set which will cause the aler t pin to be asserted. 2. the fan driver will be set to full scale drive. it will remain at full scale drive until it is disabled. application note: when the watchdog timer is activated the fan speed control algorithm is automatically disabled. disabling the watchdog will not automatically set the fan drive nor re-activate the fan speed control algorithm. this must be done manually. 6.10.1 power up operation the watchdog timer only starts immediately after power-up and once it has been triggered or deactivated will not restart although it can be configured to operate in continuous operation. in the power up operation, the watchdog timer is disabled by any of the following actions: 1. writing the fan setting register will disable the watchdog timer. 2. enabling the rpm-based fan speed control algorithm by setting the en_algo bit will disable the watchdog timer. the fan driver will be set based on the rpm-based fan speed control algorithm. 3. changing the watchdog operating mode by setting the wd_en bit. writing any other configuration registers will not disable the watchdog timer upon power up. figure 6.5 ramp rate control
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 34 ? 2013 microchip technology inc. 6.10.2 continuous operation when configured to operate in continuous operation, the watchdog timer will start immediately. it can be disabled by any access (read or write) to the smbus register set. upon completion of smbus activity, the watchdog timer is reset and restarted. 6.11 fault queue the EMC2113 contains a programmable fault queue on all fault conditions. the fault queue defines how many consecutive out-of-limit conditions must be reported before the corresponding status bit is set (and the aler t pin asserted). 6.12 alert pin the alert pin acts as an active low open drain interrupt that flags several conditions. it will be asserted low when: 1. the fsc algorithm detects a stalled fan. 2. the measured temperature meets or exceeds its programmed high limit or drops below its programmed low limit. 3. a diode fault is detected. 4. the pwm input duty cycle has exceeded its programmed limit. once asserted, the alert pin will remain asserted until the status bits have been cleared or the mask bit has been set. 6.13 temperature monitoring the EMC2113 can monitor the temperature of up to three (3) externally connected diodes as well as the internal or ambient temperature. each channel is configured with resistance error correction, bjt transistor model support, and averaging enabled or disabled based on user settings and system requirements. all temperature channels offer 1c accuracy and 0.125c resolution. 6.13.1 dynamic averaging the EMC2113 supports dynamic averaging. when enabled, this feature changes the conversion time for all channels based on the selected conversion rate. this essentially increases the averaging factor as shown in table 6.4, "dynamic averaging behavior" . the benefits of dynamic averaging are improved noise rejection due to the longer integration time as well as less random variation on the temperature measurement. table 6.4 dynamic averaging behavior conversion rate averaging factor (relative to 11-bit conversi0n) dynamic averaging enabled dynamic averaging disabled 1 / sec 8x 1x 2 / sec 4x 1x 4 / sec 2x 1x continuous 1x 1x
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 35 6.13.2 resistance error correction the EMC2113 includes active resistance error correction to remove the effect of up to 100 ohms of series resistance. without this automatic feature, voltage developed across the parasitic resistance in the remote diode path causes the temperature to read higher than the true temperature is. the error induced by parasitic resistance is approximately +0.7c per ohm. sources of parasitic resistance include bulk resistance in the remote temperature transistor junctions, series resistance in the cpu, and resistance in the printed circuit board traces and package leads. resistance error correction in the EMC2113 eliminates the need to characterize and compensate for parasitic resistance in the remote diode path. 6.13.3 beta compensation the forward current gain, or beta, of a transistor is not constant as emitter currents change. as well, it is not constant over changes in temperature. the variation in beta causes an error in temperature reading that is proportional to absolute temperature. this correction is done by implementing the bjt or transistor model for temperature measurement. for discrete transistors configured with the collector and base shorted together, the beta is generally sufficiently high such that the percent change in beta variation is very small. for example, a 10% variation in beta for two forced emitter currents with a transistor whose ideal beta is 50 would contribute approximately 0.25c error at 100c. however for substrate transistors where the base-emitter junction is used for temperature measurement and the collector is tied to the substrate, the proportional beta variation will cause large error. for example, a 10% variation in beta for two forced emitter currents with a transistor whose ideal beta is 0.5 would contribute approximately 8.25c error at 100c. the beta compensation circuitry in the EMC2113 corrects for this beta variation to eliminate any error which would normally be induced. it automatically detects the appropriate beta setting to use. 6.13.4 ideality configuration the EMC2113 is designed for external diodes with an ideality factor of 1.008. not all external diodes, processor or discrete, will have this exact value. this variation of the ideality factor introduces error in the temperature measurement which must be correct ed for. this correction is typically done using programmable offset registers. since an ideality factor mismatch introduces an error that is a function of temperature, this correction is only accurate within a small range of temperatures. to provide maximum flexibility to the user, the EMC2113 provides a register for each external diode where the ideality factor of the diode used may be programmed to eliminate errors across all temperatures. application note: when monitoring a substrate transistor or cpu diode and beta compensation is enabled, the ideality factor should not be adjusted. beta compensation automatically corrects for most ideality errors. 6.13.5 digital averaging the external diode channels support a 4x digital averaging filter. every cycle, this filter updates the temperature data based an a running average of the last 4 measured temperature values. the digital averaging reduces temperature flickering and increases temperature measurement stability. the digital averaging can be disabled by setting the dis_avg bit in the configuration 2 register (see section 7.25, "fan configuration 2 register" ). 6.14 diode connections the external diode 1 channel can support a diode-connected transistor (such as a 2n3904) or a substrate transistor requiring the bjt or transistor model (such as those found in a cpu or gpu) as shown in figure 6.6, "diode connections" . the external diode 2 channel supports any diode connection shown or it can be configured to operate in anti-parallel diode (apd) mode . when configured in apd mode , a third temperature channel is
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 36 ? 2013 microchip technology inc. available that shares the dp2 and dn2 pins. when in this mode, both the external diode 2 channel and external diode 3 channel thermal diodes must be connected as diodes. 6.14.1 anti-parallel diodes the EMC2113 supports connecting two external diodes to the dn2 / dp3 and dp2 / dn3 pins. this second diode is connected in an anti-parallel configuration with respect to the first diode. when the the external diode 2 channel is measured, the anti-parallel diode will be reverse biased. likewise, when the external diode 3 channel is measured, the first diode will be reverse biased. cpu diodes should not be used with anti-parallel diode connections. 6.14.2 diode faults the EMC2113 actively detects an open and short condition on each measurement channel. when a diode fault is detected, the temperature data msbyte is forced to a value of 80h and the fault bit is set in the status register. when the external diode 2 channel is configured to operate in apd mode, the circuitry will detect independent open fault conditions; however, a short condition will be shared between the external diode 2 and external diode 3 channels. figure 6.6 diode connections
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 37 chapter 7 fan control register set 7.1 register map the following registers are accessible through the smbus interface. all register bits marked as ?-? will always read ?0?. a write to these bits will have no effect. table 7.1 EMC2113 register set addr r/w register name function default value lock page temperature registers 00h r internal temp reading high byte stores the integer data of the internal diode 00h no page 44 01h r internal temp reading low byte stores the fractional data of the internal diode 00h no page 44 02h r external diode 1 temp reading high byte stores the integer data of external diode 1 00h no page 44 03h r external diode 1 temp reading low byte stores the fractional data of external diode 1 00h no page 44 04h r external diode 2 temp reading high byte stores the integer data of external diode 2 00h no page 44 05h r external diode 2 temp reading low byte stores the fractional data of external diode 2 00h no page 44 06h r external diode 3 temp reading high byte stores the integer data of external diode 3 00h no page 44 07h r external diode 3 temp reading low byte stores the fractional data of external diode 3 00h no page 44 0ah r critical/thermal shutdown temperature stores the calculated critical/thermal shutdown temperature high limit derived from trip_set pin voltage n/a no page 45 0ch r/w pushed temperature 1 stores the integer data for pushed temperature 1 to drive the lut 00h no page 45 0dh r/w pushed temperature 2 stores the integer data for pushed temperature 2 to drive the lut 00h no page 45 0fh r pwm input duty cycle stores the calculated duty cycle on the pwm pin 00h no page 46 10h r trip_set voltage stores the measured voltage on the trip_set pin ffh no page 46
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 38 ? 2013 microchip technology inc. diode configuration 11h r/w external diode 1 ideality register stores the ideality factor used for external diode 1 12h swl page 46 12h r/w external diode 2 ideality register stores the ideality factor used for external diode 2 12h swl page 46 13h r/w external diode 3 ideality register stores the ideality factor used for external diode 3 12h swl page 46 14h r/w external diode 1 beta configuration configures the beta compensation settings for external diode 1 10h swl page 48 15h r/w external diode 2 beta configuration configures the beta compensation settings for external diode 2 10h swl page 48 17h r/w external diode rec configuration configures the resistance error correction functionality for all external diodes 07h swl page 49 critical temperature limit registers 19h r/w once external diode 1 tcrit limit stores the critical temperature limit for external diode 1 64h (100c) write once page 50 1ah r/w once external diode 2 tcrit limit stores the critical temperature limit for external diode 2 64h (100c) write once page 50 1bh r/w once external diode 3 tcrit limit stores the critical temperature limit for external diode 3 64h (100c) write once page 50 1dh r/w once internal diode tcrit limit stores the critical temperature limit for the internal diode 64h (100c) write once page 50 configuration and control 1fh r tcrit status stores the status bits for all temperature channel tcrit limits 00h no page 53 20h r/w configuration configures the thermal / critical shutdown masking options 00h swl page 50 21h r/w configuration 2 controls the conversion rate for monitoring of all channels 0eh swl page 51 23h r interrupt status stores the status bits for temperature channels 00h no page 53 24h r-c high limit status stores the status bits for all temperature channel high limits 00h no page 53 25h r-c low limit status stores the status bits for all temperature channel low limits 00h no page 53 26h r-c diode fault stores the status bits for all temperature channel diode faults 00h no page 53 27h r-c fan status stores the status bits for the rpm- based fan speed control algorithm 00h no page 54 28h r/w interrupt enable register controls the masking of interrupts on all temperature channels 00h no page 54 table 7.1 EMC2113 register set (continued) addr r/w register name function default value lock page
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 39 29h r/w fan interrupt enable register controls the masking of interrupts for the fan driver 00h no page 55 2ah r/w pwm driver config configures the pwm driver 00h no page 56 2bh r/w pwm driver base frequency controls the base frequency of the pwm driver 00h no page 56 temperature high limit registers 30h r/w external diode 1 temp high limit high limit for external diode 1 55h (+85c) swl page 57 31h r/w external diode 2 temp high limit high limit for external diode 2 55h (+85c) swl page 57 32h r/w external diode 3 temp high limit high limit for external diode 3 55h (+85c) swl page 57 34h r/w internal diode high limit high limit for internal diode 55h (85c) swl page 57 temperature low limit registers 38h r/w external diode 1 temp low limit low limit for external diode 1 00h (0c) swl page 57 39h r/w external diode 2 temp low limit low limit for external diode 2 00h (0c) swl page 57 3ah r/w external diode 3 temp low limit low limit for external diode 3 00h (0c) swl page 57 3ch r/w internal diode low limit low limit for internal diode 00h (0c) swl page 57 pwm input duty cycle limit 3dh r/w pwm input duty cycle high limit stores the high limit for the pwm input duty cycle 7fh swl page 57 fan control registers 40h r/w fan setting always displays the most recent fan driver input setting for fan. if the rpm-based fan speed control algorithm is disabled, allows direct user control of the fan driver. 00h no page 58 41h r/w pwm divide stores the divide ratio to set the frequency for the fan 01h no page 58 42h r/w fan configuration 1 sets configuration values for the rpm-based fan speed control algorithm for the fan 2bh no page 58 43h r/w fan configuration 2 sets additional configuration values for the fan driver 28h swl page 60 45h r/w gain holds the gain terms used by the rpm-based fan speed control algorithm for the fan 2ah swl page 62 table 7.1 EMC2113 register set (continued) addr r/w register name function default value lock page
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 40 ? 2013 microchip technology inc. 46h r/w fan spin up configuration sets the configuration values for spin up routine of the fan driver 19h swl page 62 47h r/w fan step sets the maximum change per update for the fan 10h swl page 64 48h r/w fan minimum drive sets the minimum drive value for the the fan driver 66h (40%) swl page 64 49h r/w fan valid tach count holds the minimum tachometer reading that indicates the fan is spinning properly f5h swl page 65 4ah r/w fan drive fail band low byte stores the number of tach counts used to determine how the actual fan speed must match the target fan speed at full scale drive 00h swl page 65 4bh r/w fan drive fail band high byte 00h swl 4ch r/w tach target low byte holds the target tachometer reading low byte for the fan f8h no page 66 4dh r/w tach target high byte holds the target tachometer reading high byte for the fan ffh no page 66 4eh r tach reading high byte holds the tachometer reading high byte for the fan ffh no page 66 4fh r tach reading low byte holds the tachometer reading low byte for the fan f8h no page 66 look up table (lut) 50h r/w lut configuration stores and controls the configuration for the lut 00h no page 67 51h r/w lut drive 1 stores the lowest programmed drive setting for the lut fbh lut lock page 68 52h r/w lut temp 1 setting 1 stores the threshold level for the external diode 1 channel that is associated with the drive 1 value 7fh (127c) lut lock page 68 53h r/w lut temp 2 setting 1 stores the threshold level for the external diode 2 channel that is associated with the drive 1 value 7fh (127c) lut lock page 68 54h r/w lut temp 3 setting 1 stores the threshold level for the external diode 3 channel (or pushed temp 1 temp) that is associated with the drive 1 value 7fh (127c) lut lock page 68 55h r/w lut temp 4 setting 1 stores the threshold level for the internal diode channel (or pushed temp 2 temp) that is associated with the drive 1 value 7fh (127c) lut lock page 68 56h r/w lut drive 2 stores the second programmed drive setting for the lut e6h lut lock page 68 57h r/w lut temp 1 setting 2 stores the threshold level for the external diode 1 channel that is associated with the drive 2 value 7fh (127c) lut lock page 68 table 7.1 EMC2113 register set (continued) addr r/w register name function default value lock page
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 41 58h r/w lut temp 2 setting 2 stores the threshold level for the external diode 2 channel that is associated with the drive 2 value 7fh (127c) lut lock page 68 59h r/w lut temp 3 setting 2 stores the threshold level for the external diode 3 channel (or pushed temp 1 temp) that is associated with the drive 2 value 7fh (127c) lut lock page 68 5ah r/w lut temp 4 setting 2 stores the threshold level for the internal diode channel (or pushed temp 2 temp) that is associated with the drive 2 value 7fh (127c) lut lock page 68 5bh r/w lut drive 3 stores the third programmed drive setting for the lut d1h lut lock page 68 5ch r/w lut temp 1 setting 3 stores the threshold level for the external diode 1 channel that is associated with the drive 3 value 7fh (127c) lut lock page 68 5dh r/w lut temp 2 setting 3 stores the threshold level for the external diode 2 channel that is associated with the drive 3 value 7fh (127c) lut lock page 68 5eh r/w lut temp 3 setting 3 stores the threshold level for the external diode 3 channel (or pushed temp 1 temp) that is associated with the drive 3 value 7fh (127c) lut lock page 68 5fh r/w lut temp 4 setting 3 stores the threshold level for the internal diode channel (or pushed temp 2 temp) that is associated with the drive 3 value 7fh (127c) lut lock page 68 60h r/w lut drive 4 stores the fourth programmed drive setting for the lut bch lut lock page 68 61h r/w lut temp 1 setting 4 stores the threshold level for the external diode 1channel that is associated with the drive 4 value 7fh (127c) lut lock page 68 62h r/w lut temp 2 setting 4 stores the threshold level for the external diode 2 channel that is associated with the drive 4 value 7fh (127c) lut lock page 68 63h r/w lut temp 3 setting 4 stores the threshold level for the external diode 3 channel (or pushed temp 1 temp) that is associated with the drive 4 value 7fh (127c) lut lock page 68 64h r/w lut temp 4 setting 4 stores the threshold level for the internal diode channel (or pushed temp 2 temp) that is associated with the drive 4 value 7fh (127c) lut lock page 68 65h r/w lut drive 5 stores the fifth programmed drive setting for the lut a7h lut lock page 68 66h r/w lut temp 1 setting 5 stores the threshold level for the external diode 1 channel that is associated with the drive 5 value 7fh (127c) lut lock page 68 table 7.1 EMC2113 register set (continued) addr r/w register name function default value lock page
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 42 ? 2013 microchip technology inc. 67h r/w lut temp 2 setting 5 stores the threshold level for the external diode 2 channel that is associated with the drive 5 value 7fh (127c) lut lock page 68 68h r/w lut temp 3 setting 5 stores the threshold level for the external diode 3 channel (or pushed temp 1 temp) that is associated with the drive 5 value 7fh (127c) lut lock page 68 69h r/w lut temp 4 setting 5 stores the threshold level for the internal diode channel (or pushed temp 2 temp) that is associated with the drive 5 value 7fh (127c) lut lock page 68 6ah r/w lut drive 6 stores the sixth programmed drive setting for the lut 92h lut lock page 68 6bh r/w lut temp 1 setting 6 stores the threshold level for the external diode 1 channel that is associated with the drive 6 value 7fh (127c) lut lock page 68 6ch r/w lut temp 2 setting 6 stores the threshold level for the external diode 2 channel that is associated with the drive 6 value 7fh (127c) lut lock page 68 6dh r/w lut temp 3 setting 6 stores the threshold level for the external diode 3 channel (or pushed temp 1 temp) that is associated with the drive 6 value 7fh (127c) lut lock page 68 6eh r/w lut temp 4 setting 6 stores the threshold level for the internal diode channel (or pushed temp 2 temp) that is associated with the drive 6 value 7fh (127c) lut lock page 68 6fh r/w lut drive 7 stores the seventh programmed drive setting for the lut 92h lut lock page 68 70h r/w lut temp 1 setting 7 stores the threshold level for the external diode 1 channel that is associated with the drive 7 value 7fh (127c) lut lock page 68 71h r/w lut temp 2 setting 7 stores the threshold level for the external diode 2 channel that is associated with the drive 7 value 7fh (127c) lut lock page 68 72h r/w lut temp 3 setting 7 stores the threshold level for the external diode 3 channel (or pushed temp 1 temp) that is associated with the drive 7 value 7fh (127c) lut lock page 68 73h r/w lut temp 4 setting 7 stores the threshold level for the internal diode channel (or pushed temp 2 temp) that is associated with the drive 7 value 7fh (127c) lut lock page 68 74h r/w lut drive 8 stores the highest programmed drive setting for the lut 92h lut lock page 68 75h r/w lut temp 1 setting 8 stores the threshold level for the external diode 1 channel that is associated with the drive 8 value 7fh (127c) lut lock page 68 table 7.1 EMC2113 register set (continued) addr r/w register name function default value lock page
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 43 during power-on-reset (por), the default values are stored in the registers. a por is initiated when power is first applied to the part and the volt age on the vdd supply surpasses the por level as specified in the electrical characteristics. any reads to undefined registers will return 00h. writes to undefined registers will not have an effect. 7.1.1 lock entries the lock column describes the locking mechanism, if any, used for individual registers. all swl registers are software locked and therefore made read-only when the lock bit is set. 76h r/w lut temp 2 setting 8 stores the threshold level for the external diode 2 channel that is associated with the drive 8 value 7fh (127c) lut lock page 68 77h r/w lut temp 3 setting 8 stores the threshold level for the external diode 3 channel (or pushed temp 1 temp) that is associated with the drive 8 value 7fh (127c) lut lock page 68 78h r/w lut temp 4 setting 8 stores the threshold level for the internal diode channel (or pushed temp 2 temp) that is associated with the drive 8 value 7fh (127c) lut lock page 68 79h r/w lut temp 1 hysteresis stores the hysteresis that is used in the lut for the temp 1 settings 0ah (10c) lut lock page 68 7ah r/w lut temp 2 hysteresis stores the hysteresis that is used in the lut for the temp 2 settings 0ah (10c) lut lock page 68 7bh r/w lut temp 3 hysteresis stores the hysteresis that is used in the lut for the temp 3 settings 0ah (10c) lut lock page 68 7ch r/w lut temp 4 hysteresis stores the hysteresis that is used in the lut for the temp 4 settings 0ah (10c) lut lock page 68 7dh r/w lut configuration stores and controls the configuration for the lut 00h no page 67 lock register efh r/w software lock locks all swl registers 00h swl page 70 revision registers fch r product features indicates which pin selected options are enabled 00h no page 70 fdh r product id stores the unique product id 2eh no page 71 feh r manufacturer id manufacturer id 5dh no page 72 ffh r revision revision 81h no page 72 table 7.1 EMC2113 register set (continued) addr r/w register name function default value lock page
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 44 ? 2013 microchip technology inc. 7.2 temperature data registers the temperature measurement range is from -64c to +127.875c. the data format is a signed two?s complement number as shown in table 7.3, "temperature data format" . table 7.2 temperature data registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 00h r internal diode high byte sign 64 32 16 8 4 2 1 00h 01h r internal diode low byte 0.5 0.25 0.125 - - - - - 00h 02h r external diode 1 high byte sign 64 32 16 8 4 2 1 00h 03h r external diode 1 low byte 0.5 0.25 0.125 - - - - - 00h 04h r external diode 2 high byte sign 64 32 16 8 4 2 1 00h 05h r external diode 2 low byte 0.5 0.25 0.125 - - - - - 00h 06h r external diode 3 high byte sign 64 32 16 8 4 2 1 00h 07h r external diode 3 low byte 0.5 0.25 0.125 - - - - - 00h table 7.3 temperature data format temperature (c) binary hex (as read by registers) diode fault 1000_0000_000b 80_00h -63.875 1100_0000_001b c0_20h -63 1100_0001_000b c1_00h -1 1111_1111_000b ff_00h -0.125 1111_1111_111b ff_e0h 0 0000_0000_000b 00_00h 0.125 0000_0000_001b 00_20h 1 0000_0001_000b 01_00h 63 0011_1111_000b 3f_00h 64 0100_0000_000b 40_00h
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 45 7.3 critical/thermal shutdown temperature register the critical/thermal shutdown temperature register is a read-only register that stores the voltage programmable threshold temperature used in the thermal / critical shutdown circuitry. the contents of the register reflect the calculated temperature determined by the voltage on the trip_set pin (see section 6.1.2, "shdn_sel pin" ). the data format is shown in table 7.5, "critical/thermal shutdown data format" . 7.4 pushed temperature registers 65 0100_0001_000b 41_00h 127 0111_1111_000b 7f_00h 127.875 0111_1111_111b 7f_e0h table 7.4 critical/thermal shutdown temperature register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 0ah r critical/thermal shutdown temperature 128 64 32 16 8 4 2 1 7fh (+127c) table 7.5 critical/thermal shutdown data format temperature (c) binary hex 0 0000_0000b 00h 1 0000_0001b 01h 63 0011_1111b 3fh 64 0100_0000b 40h 65 0100_0001b 41h 127 0111_1111b 7fh table 7.6 pushed temperature registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 0ch r/w pushed / polled temperature 1 sign 64 32 16 8 4 2 1 00h 0dh r/w pushed / polled temperature 2 sign 64 32 16 8 4 2 1 00h table 7.3 temperature data format (continued) temperature (c) binary hex (as read by registers)
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 46 ? 2013 microchip technology inc. the pushed temperature registers store user programmed temperature values or temperature values polled from one or more slave devices. this temperature can be used by the look-up table to update the fan control algorithm. data written in these registers is not compared against any limits and must match the data format shown in table 7.3, "temperature data format" . 7.5 pwm input duty cycle register the pwm input duty cycle register stores the calculated duty cycle of the signal on the pwm_in pin. the value is stored as an 7-bit pwm setting ranging from 0 to 127 and represents the duty cycle as shown in equation [1] . when used by the fan control look up table (lut), the 7-bit pwm input duty cycle register setting is used as a temperature input and compared against the programmed thresholds. 7.6 trip_set voltage register the trip_set voltage register stores data that is measured on the trip_set voltage input. each bit weight represents mv of resolution so that the final voltage can be determined by adding the weighting of the set bits together. 7.7 ideality factor registers table 7.7 pwm duty cycle register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 0fh r pwm input duty cycle -6432168421 00h [1] table 7.8 trip_set voltage register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 10h r trip_set voltage 750.0 375.0 187.5 93.75 46.88 23.43 11.72 5.86 ffh table 7.9 ideality factor registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 11h r/w external diode 1 ideality 00010b2b1b012h 12h r/w external diode 2 ideality 00010b2b1b012h 13h r/w external diode 3 ideality 00010b2b1b012h pwm duty cycle value 128 -------------------- - ?? ?? 100% ? =
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 47 these registers store the ideality factors that are applied to the external diodes. beta compensation and resistance error correction automatically correct for most diode ideality errors, therefore it is not recommended that these settings be updated without consulting microchip. for cpu substrate transistors that require the bjt transistor model, the ideality factor behaves slightly differently than for discrete diode-connected transistors. refer to table 7.11, "substrate diode ideality factor look-up table (bjt model)" when using a cpu substrate transistor. only the lower three bits can be written. writing to any other bit will be ignored. the ideality factor registers are software locked. application note: when measuring a 65nm intel cpus, the ideality setting should be the default 12h. when measuring 45nm intel cpus, the ideality setting should be 15h. table 7.10 ideality factor look-up table setting factor 10h 1.0053 11h 1.0066 12h 1.0080 13h 1.0093 14h 1.0106 15h 1.0119 16h 1.0133 17h 1.0146 table 7.11 substrate diode ideality factor look-up table (bjt model) setting factor 10h 0.9973 11h 0.9986 12h 1.0000 13h 1.0013 14h 1.0026 15h 1.0039 16h 1.0053 17h 1.0066
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 48 ? 2013 microchip technology inc. 7.8 beta configuration register the beta configuration register controls advanced temperature measurement features of the external diode channels. if external diode 1 is selected as the hardware shutdown measurement channel (see section 6.1, "critical/thermal shutdown" ) then the external diode 1 beta register will be read only. if the internal diode is selected, then this register can be written normally. likewise, if the external diode 2 channel is selected then this register can be written normally. finally, if external diode 2 is selected as the hardware shutdown measurement channel, then the external diode 2 beta configuration register will be read only. the external diode 3 channel beta configuration will always be set at 07h (disabled / diode mode). writing to a read only register will have no affect. the data will be ignored. bit 4 - autox - enables the automatic beta detection algorithm for the external diode x channel. ? ?0? - the automatic beta detection algorithm is disabled. the betax[2:0] bit settings will be used to control the beta compensation circuitry. ? ?1? (default) - the automatic beta detection algorithm is enabled. the circuitry will automatically detect the transistor type and beta values and configure the betax[2:0] bits for optimal performance. bits 2 - 0 - betax[2:0] - hold a value that corresponds to a range of betas that the beta compensation circuitry can compensate for. these three bits will always show the current beta setting used by the circuitry. if the auto bit is set (default), then these bits may be overwritten with every temperature conversion. if the auto bit is not set, then the value of these bits is used to drive the beta compensation circuitry. in this case, these bits should be set with a value corresponding to the lowest expected value of beta for the pnp transistor being used as a temperature sensing device. see table 7.13, "beta compensation look up table" for supported beta ranges. a value of 111b indicates that the beta compensation circuitry is disabled. in this condition, the diode channels will function with default current levels and will not automatically adjust for beta variation. this mode is used when measuring a discrete 2n3904 transistor or amd thermal diode. the beta configuration registers are software locked. table 7.12 beta configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 14h r/w external diode 1 beta configuration --- aut o1 - beta1[2:0] 10h 15h r/w external diode 2 beta configuration --- aut o2 - beta2[2:0] 10h table 7.13 beta compensation look up table betax[2:0] minimum beta 210 000 < 0.08 001 < 0.111
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 49 7.9 rec configuration register the rec configuration register determines whether resistance error correction is used for each external diode channel. bit 2 - rec3 - controls the resistance error correction functionality of external diode 3 ? ?0? - the rec functionality for external diode 3 is disabled ? ?1? (default) - the rec functionality for external diode 3 is enabled. bit 1 - rec2 - controls the resistance error correction functionality of external diode 2. ? ?0? - the rec functionality for external diode 2 is disabled ? ?1? (default) - the rec functionality for external diode 2 is enabled. bit 0 - rec1 - indicates the resistance error correction functionality of external diode 1. if external diode 1 is selected as the hardware shutdown channel then this bit is read only. ? ?0? - the rec functionality for external diode 1 is disabled ? ?1? (default) - the rec functionality for external diode 1 is enabled. the rec configuration register is software locked. 010 < 0.176 011 < 0.29 100 < 0.48 101 < 0.9 110 < 2.33 1 1 1 disabled table 7.14 rec configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 17h r/w rec configuration ----- rec3 rec2 rec1 07h table 7.13 beta compensation look up table (continued) betax[2:0] minimum beta 210
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 50 ? 2013 microchip technology inc. 7.10 critical temperature limit registers the critical temperature limit registers store the critical temperature limit. at power up, none of the respective channels are linked to the sys_shdn pin or the hardware set thermal/critical shutdown circuitry. whenever one of the registers is updated, two things occur. first, the register is locked so that it cannot be updated again without a power on reset. second, the respective temperature channel is linked to the s y s _ s h d n pin and the hardware set t hermal/critical shutdown circu itry. at this point, if the measured temperature channel meets or exceeds the critical limit, the sys_shdn pin will be asserted, the appropriate bit set in the tcrit status register, and the tcrit bit in the interrupt status register will be set. 7.11 configuration register the configuration register controls the basic functionality of the EMC2113. the bits are described below. bit 7 - mask - blocks the aler t pin from being asserted. ? ?0? (default) - the aler t pin is unmasked. if any bit in either status register is set, the aler t pin will be asserted (unless individually masked via the mask register) ? ?1? - the aler t pin is masked and will not be asserted. bit 6 - wd_en - enables the watchdog timer to operate in continuous mode. ? ?0? (default) - the watchdog timer does not operate continuously. it will function upon power up and at no other time. ? ?1? - the watchdog timer operates continuously as described in section 6.10.2, "continuous operation" . bit 3 - sys3 - enables the high temperature limit for the external diode 3 channel to trigger the critical/thermal shutdown circuitry (see section 6.1, "critical/thermal shutdown" ). ? ?0? (default) - the external diode 3 channel high limit will not be linked to the sys_shdn pin. if the temperature meets or exceeds the limit, the aler t pin will be asserted normally. table 7.15 limit registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 19h r/w once external diode 1 tcrit limit sign 64 32 16 8 4 2 1 64h (+100c) 1ah r/w once external diode 2 tcrit limit sign 64 32 16 8 4 2 1 64h (+100c) 1bh r/w once external diode 3 tcrit limit sign 64 32 16 8 4 2 1 64h (+100c) 1dh r/w once internal diode tcrit limit sign 64 32 16 8 4 2 1 64h (+100c) table 7.16 configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 20h r/w configuration mask wd_en - - sys3 sys2 sys1 apd 00h
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 51 ? ?1? - the external diode 3 channel high limit will be linked to the sys_shdn pin. if the temperature meets or exceeds the limit then the sys_shdn pin will be asserted. the sys_shdn pin will be released when the temperature drops below the high limit. the aler t pin will be asserted normally. bit 2 - sys2 - enables the high temperature limit for the external diode 2 channel to trigger the critical/thermal shutdown circuitry (see section 6.1 ). ? ?0? (default) - the external diode 2 channel high limit will not be linked to the sys_shdn pin. if the temperature meets or exceeds the limit, the aler t pin will be asserted normally. ? ?1? - the external diode 2 channel high limit will be linked to the sys_shdn pin. if the temperature meets or exceeds the limit then the sys_shdn pin will be asserted. the aler t pin will be asserted normally. bit 1 - sys1 - enables the high temperature limit for the external diode 1 channel to trigger the critical/thermal shutdown circuitry (see section 6.1 ). ? ?0? (default) - the external diode 1 channel high limit will not be linked to the sys_shdn pin. if the temperature meets or exceeds the limit, the aler t pin will be asserted normally. ? ?1? - the external diode 1 channel high limit will be linked to the sys_shdn pin. if the temperature meets or exceeds the limit then the sys_shdn pin will be asserted. the aler t pin will be asserted normally. bit 0 - apd - this bit enables the anti-parallel diode functionality on the external diode 3 pins (dp3 and dn3). ? ?0? (default) - the anti-parallel diode functionality is disabled. the external diode 2 channel can be configured for any type of diode ? ?1? - the anti-parallel diode functionality is enabled. both the external diode 2 and 3 channels are configured to support a diode or diode connected transistor (such as a 2n3904). application note: when the apd diode is enabled, there will be a delay of a full temperature update before any comparisons and functionality associated with the external diode 3 channel will be implemented. this includes the sys3 bit operat ion, limit comparisons, and look up table comparisons. the configuration register is software locked. 7.12 configuration 2 register the configuration 2 register controls conversion rate of the temperature monitoring as well as the fault queue. bit 6 - dis_dyn - disables the dynamic averaging feature. ? ?0? (default) - the dynamic averaging function is enabled. the conversion time for all temperature channels is scaled based on the chosen conversion rate to maximize accuracy and immunity to random temperature measurement variation. ? ?1? - the dynamic averaging function is disabled. the conversion time for all temperature channels is fixed regardless of the chosen conversion rate. table 7.17 configuration 2 register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 21h r/w config 2 - dis_ dyn dis_ to dis_ avg queue[1:0] conv[1:0] 0eh
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 52 ? 2013 microchip technology inc. bit 5 - dis_to - disables the smbus timeout function. ? ?0? (default) - the smbus timeout function is enabled. ? ?1? - the smbus timeout function is disabled allowing the device to be fully i 2 c compliant. bit 4 - dis_avg - disables digital averaging of the external diode channels. ? ?0? (default) - the external diode channels have digital averaging enabled. the temperature data is the average of the previous four measurements. ? ?1? - the external diode channels have digital averaging disabled. the temperature data is the last measured data. bits 3-2 - queue[1:0] - determines the number of consecutive out of limit conditions that are necessary to trigger an interrupt. each measurement channel has a separate fault queue associated with the high limit, low limit, and diode fault condition. application note: if the fault queue for any channel is currently active (i.e. an out of limit condition has been detected and caused the fault queue to increment) then changing the settings will not take effect until the fault queue is zeroed. this occurs by the aler t pin asserting or the out of limit condition being removed. bit 1 - 0 - conv[1:0] - determines the conversion rate of the temperature monitoring. this conversion rate does not affect the fan driver. the supply current from vdd_3v is nominally dependent upon the conversion rate and the average current will increase as the conversion rate increases. the configuration 2 register is software locked. table 7.18 fault queue queue[1:0] number of consecutive out of limit conditions 10 0 0 1 (disabled) 01 2 10 3 1 1 4 (default) table 7.19 conversion rate conv[1:0] conversion rate 10 0 0 1 / sec 0 1 2 / sec 1 0 4 / sec (default) 1 1 continuous
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 53 7.13 interrupt status register the interrupt status register reports the operating condition of the EMC2113. if any of the bits are set to a logic ?1? (other than tcrit) then the aler t pin will be asserted low if the corresponding channel is enabled. reading from the status register clears the pwm bit. the other bits are cleared automatically when the corresponding register is read. if there are no set status bits, then the aler t pin will be released. the bits that cause the a l e r t pin to be asserted can be masked based on the channel they are associated with unless stated otherwise. bit 7 - pwm - this bit indicates that the pwm input duty cycle (on the pwm pin) meets or exceeds the high limit. this bit is cleared when the register is read. bit 5 - tcrit - this bit is set to ?1? if any bit in the tcrit status register is set. this bit is automatically cleared when the tcrit status register is read and the bits are cleared. bit 3 - fan - this bit is set to ?1? if any bit in the fan status register is set. this bit is automatically cleared when the fan status register is read and the bits are cleared. bit 2 - high - this bit is set to ?1? if any bit in the high status register is set. this bit is automatically cleared when the high status register is read and the bits are cleared. bit 1- low - this bit is set to ?1? if any bit in the low status register is set. this bit is automatically cleared when the low status register is read and the bits are cleared. bit 0 - fault - this bit is set to ?1? if any bit in the diode fault register is set. this bit is automatically cleared when the diode fault register is read and the bits are cleared. 7.14 error status registers the error status registers report the specific error condition for all measurement channels with limits. if any bit is set in the high, low, or diode fault status register, the corresponding high, low, or fault bit is set in the interrupt status register. table 7.20 interrupt status register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 23h r interrupt status register pwm - tcrit - fan high low fault 00h table 7.21 error status register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 1fh r-c tcrit status hws - - - ext3_ tcrit ext2_ tcrit ext1_ tcrit int_ tcrit 00h 24h r-c high status - - - - ext3_ hi ext2_ hi ext1_ hi int_hi 00h 25h r-c low status - - - - ext3_ lo ext2_ lo ext1_ lo int_lo 00h 26h r-c diode fault - - - - ext3_ flt ext2_ flt ext1_ flt - 00h
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 54 ? 2013 microchip technology inc. reading the interrupt status register does not clear the error status bit. reading from any error status register that has bits set will clear the register and the corresponding bit in the interrupt status register if the error condition has been removed. if the error condition is persistent, reading the error status registers will have no effect. 7.14.1 tcrit status register the tcrit status register stores which software enabled temperature channel has caused the s y s _ s h d n pin to be asserted. each of the temperature channels must be associated with the sys_shdn pin before they can be set (see section 7.10, "critical temperature limit registers" ). once the sys_shdn pin is asserted, it will be released when the temperature drops below the threshold level; however, the individual status bit will not be cleared until read. bit 7 - hws - this bit is set if the hardware set temperature channel caused the sys_shdn pin to be asserted. 7.15 fan status register the fan status register contains the status bits associated with each fan driver. bit 7 - watch - this bit is asserted ?1? if the watchdog timer has expired (see section 6.10, "watchdog timer" ). bit 5 - drive_fail - indicates that the rpm-based fan speed control algorithm cannot drive the fan to the desired target setting at maximum drive. this bit can be masked from asserting the aler t pin. ? ?0? - the rpm-based fan speed control algorithm can drive fan to the desired target setting. ? ?1? - the rpm-based fan speed control algorithm cannot drive fan to the desired target setting at maximum drive. bit 1- fan_spin - this bit is asserted ?1? if the spin up routine for the fan cannot detect a valid tachometer reading within its maximum time window. this bit can be masked from asserting the aler t pin. bit 0 - fan_stall - this bit is asserted ?1? if the tachometer measurement on the fan detects a stalled fan. this bit can be masked from asserting the aler t pin. 7.16 interrupt enable register the interrupt enable register controls the masking for each temperature channel. when a channel is masked, it will not cause the aler t pin to be asserted when an error condition is detected. table 7.22 fan status register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 27h r-c fan status register watch - drive_ fail --- fan_ spin fan_ stall 00h table 7.23 interrupt enable register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 28h r/w interrupt enable pwm_ int_ en --- ext3_ int_ en ext2_ int_ en ext1_ int_ en int_ int_ en 00h
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 55 bit 7 - pwm_int_en - allows the pwm input to assert the aler t pin. ? ?0? (default) - the aler t pin will not be asserted if the pwm input duty cycle meets or exceeds its high limit. ? ?1? - the aler t pin will be asserted if the pwm input duty cycle meets or exceeds its high limit. bit 3 - ext3_int_en - allows the external diode 3 to assert the aler t pin. ? ?0? (default) - the aler t pin will not be asserted for any error condition associated with external diode 3 channel. ? ?1? - the aler t pin will be asserted for an error condition associated with external diode 3 channel. bit 2 - ext2_int_en - allows the external diode 2 to assert the aler t pin. ? ?0? (default) - the aler t pin will not be asserted for any error condition associated with external diode 2 channel. ? ?1? - the aler t pin will be asserted for an error condition associated with external diode 2 channel. bit 1 - ext1_int_en - allows the external diode 1 to assert the aler t pin. ? ?0? (default) - the aler t pin will not be asserted for any error condition associated with external diode 1 channel. ? ?1? - the aler t pin will be asserted for an error condition associated with external diode 1 channel. bit 0 - int_int_en - allows the internal diode to assert the aler t pin. ? ?0? (default) - the aler t pin will not be asserted for any error condition associated with the internal diode. ? ?1? - the aler t pin will be asserted for an error condition associated with the internal diode. 7.17 fan interrupt enable register the fan interrupt enable register controls the masking for errors generated by the fan driver. when a channel is masked, it will not cause the a l e r t pin to be asserted when an error condition is detected. bit 1 - spin_int_en - allows the fan_spin bit to assert the aler t pin. ? ?0? (default) - the fan_spin bit will not assert the aler t pin though it will still update the status register normally. ? ?1? - the fan_spin bit will assert the aler t pin. bit 0 - stall_int_en - allows the fan_stall bit or drive_fail bit to assert the aler t pin. ? ?0? (default) - the fan_stall bit or drive_fail bit will not assert the aler t pin though will still update the status register normally. ? ?1? - the fan_stall bit will assert the aler t pin. table 7.24 fan interrupt enable register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 29h r/w fan interrupt enable ------ spin_ int_en stall_ int_en 00h
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 56 ? 2013 microchip technology inc. 7.18 pwm driver configuration register the pwm driver configuration register controls the output type and polarity of the pwm fan drive output. bit 4 - pwm_ot - determines the output type for the pwm pin. ? ?0? (default) - the pwm pin is configured as an open drain output. ? ?1? - the pwm pin is configured as a push-pull output. bit 0 - polarity - determines the polarity of the pwm pin. ? ?0? (default) - the polarity of the pwm output driver is normal. a drive setting of 00h will cause the output to be set at 0% duty cycle and a drive setting of ffh will cause the output to be set at 100% duty cycle. ? ?1? - the polarity of the pwm output driver is inverted. a drive setting of 00h will cause the output to be set at 100% duty cycle and a drive setting of ffh will cause the output to be set at 0% duty cycle. 7.19 pwm driver base frequency register the pwm driver base frequency register controls base frequency of the pwm driver output. bits 1-0 - pwm_base[1:0] - determines the base frequency of the pwm output driver. table 7.25 pwm driver configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 2ah r/w pwm driver config --- pwm_ ot - - - polarity 00h table 7.26 pwm driver base frequency register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 2bh r/w pwm driver base frequency ---- - - pwm_base[1:0] 00h table 7.27 pwm_basex[1:0] it decode pwm_base[1:0] base frequency 10 0 0 26.00khz (default) 0 1 19.531khz 1 0 4,882hz 1 1 2,441hz
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 57 7.20 limit registers the EMC2113 contains high limits for all temperature channels. if any measurement meets or exceeds the high limit then the appropriate status bit is set and the aler t pin is asserted (if enabled). additionally, the EMC2113 contains low limits for all temperature channels. if the temperature channel drops below the low limit, then the app ropriate status bit is set and the a l e r t pin is asserted (if enabled). all limit registers are software locked. 7.21 pwm input duty cycle high limit register the pwm duty cycle high limit register stores a high limit on the duty cycle input on the pwm pin. the data format for the register is the same as the pwm input duty cycle register (see section 7.5, "pwm input duty cycle register" ) and it is compared at the sampling rate of the pwm input duty cycle. if the pwm input duty cycle meets or exceeds this limit, then the pwm status bit is set (see section 7.13, "interrupt status register" ) and the aler t pin is asserted. this is treated as a temperature limit by the fan control circuitry. table 7.28 limit registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 30h r/w external diode 1 high limit sign 64 32 16 8 4 2 1 55h (+85c) 31h r/w external diode 2 high limit sign 64 32 16 8 4 2 1 55h (+85c) 32h r/w external diode 3 high limit sign 64 32 16 8 4 2 1 55h (+85c) 34h r/w internal diode high limit sign 64 32 16 8 4 2 1 55h (+85c) 38h r/w external diode 1 low limit sign 64 32 16 8 4 2 1 00h (0c) 39h r/w external diode 2 low limit sign 64 32 16 8 4 2 1 00h (0c) 3ah r/w external diode 3 low limit sign 64 32 16 8 4 2 1 00h (0c) 3ch r/w internal diode low limit sign 64 32 16 8 4 2 1 00h (0c) table 7.29 pwm duty cycle high limit register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 3dh r/w pwm input duty cycle high limit - 64 32 16 8 4 2 1 7fh
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 58 ? 2013 microchip technology inc. 7.22 fan setting registers the fan setting register always displays the current setting of the fan driver. reading from the register will report the current fan speed setting of the fan driver regardless of the operating mode. therefore it is possible that reading from this register will not report data that was previously written into this register. while the rpm-based fan speed control algorithm and/or the look up table are active, then the register is read only. writing to the register will have no effect and the data will not be stored. if both the rpm-based fan control algorithm and the look up table are disabled, then the register will be set with the previous value that was used. the register is read / write and writing to this register will affect the fan speed. the contents of the register represent the weighting of each bit in determining the final duty cycle. the output drive for a pwm output is given by equation [2] . 7.23 pwm divide register the pwm divide register determines the final frequency of the pwm driver. the driver base frequency is divided by the value of the pwm divide register to determine the final frequency. the duty cycle settings are not affected by these settings, only the final frequency of the pwm driver. a value of 00h will be decoded as 01h. the final pwm frequency is derived as the base frequency divided by the value of this register as shown in equation [3] . 7.24 fan configuration 1 register table 7.30 fan driver setting register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 40h r/w fan setting 128 64 32 16 8 4 2 1 00h [2] table 7.31 pwm divide register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 41h r/w pwm divide 128 64 32 16 8 4 2 1 01h [3] table 7.32 fan configuration 1 register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 42h r/w fan configuration 1 en_ algo range[1:0] edges[1:0] update[2:0] 2bh drive value 255 -------------------- - ?? ?? 100% ? = f pwm pwm base freqeuncy pwm divide setting --------------------------------------------------------------- - =
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 59 the fan configuration 1 register controls the general operation of the rpm-based fan speed control algorithm used on the pwm pin. bit 7 - en_algo - enables the rpm-based fan speed control algorithm. based on the setting of the rpm / pwm bit, this bit is automatically set or cleared when the lut_lock bit is set (see section 7.34, "look up table configuration register" ). ? ?0? - (default) the control circuitry is disabled and the fan driver output is determined by the fan driver setting register. ? ?1? - the control circuitry is enabled and the fan driver output will be automatically updated to maintain the programmed fan speed as indicated by the tach target register. bits 6- 5 - range[1:0] - adjusts the range of reported and programmed tachometer reading values. the range bits determine the weighting of all tach values (including the valid tach count, tach target, and tach reading) as shown in table 7.33, "range decode" . bits 4-3 - edges[1:0] - determines the minimum number of edges that must be detected on the tach signal to determine a single rotation. a typical fan measured 5 edges (for a 2-pole fan). for more accurate tachometer measurement, the minimum number of edges measured may be increased. increasing the number of edges measured with respect to the number of poles of the fan will cause the tach reading registers to indicate a fan speed that is higher or lower than the actual speed. in order for the fsc algorithm to operate correctly, the tach target must be updated by the user to accommodate this shift. the effective tach multiplier shown in table 7.34, "minimum edges for fan rotation" is used as a direct multiplier term that is applied to the actual rpm to achieve the reported rpm. it should only be applied if the number of edges measured does not match the number of edges expected based on the number of poles of the fan (which is fixed for any given fan). contact microchip for recommended settings when using fans with more or less than 2 poles. bit 2-0 - update - determines the base time between fan driver updates. the update time, along with the fan step register, is used to control the ramp rate of the drive response to provide a cleaner table 7.33 range decode range[1:0] reported minimum rpm tach count multiplier 10 0 0 500 1 0 1 1000 (default) 2 1 0 2000 4 1 1 4000 8 table 7.34 minimum edges for fan rotation edges[1:0] minimum tach edges number of fan poles effective tach multiplier (based on 2 pole fans) 10 0 0 3 1 pole 0.5 0 1 5 2 poles (default) 1 1 0 7 3 poles 1.5 1 1 9 4 poles 2
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 60 ? 2013 microchip technology inc. transition of the actual fan operation as the desired fan speed changes. the update time is set as shown in table 7.35 . 7.25 fan configuration 2 register the fan configuration 2 register controls the tachometer measurement and advanced features of the rpm-based fan speed control algorithm. bit 7 - temp_rr - overrides max step controls for the fsc algorithm when any temperature exceeds its respective high limit. ? ?0? (default) - all ramp rate control circuitry works at all times for the fsc algorithm or as determined by the en_rrc bit for manual mode. ? ?1? - if any measured temperature or the pwm input duty cycle meets or exceeds its respective high limit, then the fan max step register settings are not used and the fsc algorithm acts as if the max step settings were at 3fh. the device will continue to operate in this way until all temperatures (and the pwm input duty cycle) have dropped below the respective high limit. bit 6 - en_rrc - enables ramp rate control when the fan driver is operated in the direct setting mode or the direct setting with lut mode. ? ?0? (default) - ramp rate control is disabled. when the fan driver is operating in direct setting mode or direct setting with lut mode, the pwm setting will instantly transition to the next programmed setting. ? ?1? - ramp rate control is enabled. when the fan driver is operating in direct setting mode or direct setting with lut mode, the pwm setting will follow the ramp rate controls as determined by the fan step and update time settings. the maximum pwm step is capped at the fan step setting and is updated based on the update time as given by table 7.35 . table 7.35 update time update[2:0] update time 21 0 0 0 0 100ms 0 0 1 200ms 0 1 0 300ms 0 1 1 400ms (default) 1 0 0 500ms 1 0 1 800ms 1 1 0 1200ms 1 1 1 1600ms table 7.36 fan configuration 2 register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 43h r/w fan configuration 2 temp_ rr en_ rrc glitch_ en der_opt [1:0] err_rng:0] - 28h
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 61 bit 5 - glitch_en - disables the low pass glitch filter that removes high frequency noise injected on the tach pin. ? ?0? - the glitch filter is disabled. ? ?1? (default) - the glitch filter is enabled. bits 4 - 3 - der_opt[1:0] - control some of the advanced options that affect the derivative portion of the rpm-based fan speed control algorithm as shown in table 7.37, "derivative options" . bit 2 - 1 - err_rng[1:0] - control some of the advanced options that affect the error window. when the measured fan speed is within the programmed error window around the target speed, then the fan drive setting is not updated. the algorithm will continue to monitor the fan speed and calculate necessary drive setting changes based on the error; however, these changes are ignored. the fan configuration 2 register is software locked. table 7.37 derivative options der_opt[1:0] operation 10 0 0 no derivative terms used 01 basic derivative. the derivative of the error from the current drive setting and the target is added to the iterative fan drive setting (in addition to proportional and integral terms - default) 10 step derivative. the derivative of the error from the current drive setting and the target is added to the iterative fan drive setting and is not capped by the maximum fan step register setting. 11 both the basic derivative and the step derivative are used effectively causing the derivative term to have double the effect of the derivative term. table 7.38 error range options err_rng[1:0] operation 10 0 0 0 rpm (default) 0 1 50 rpm 1 0 100 rpm 1 1 200 rpm
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 62 ? 2013 microchip technology inc. 7.26 gain register the gain register stores the gain terms used by the proportional and integral portions of the rpm- based fan speed control algorithm. these terms will affect the fsc closed loop acquisition, overshoot, and settling as would be expected in a classic pid system. 7.27 fan spin up configuration register the fan spin up configuration register controls the settings of spin up routine. bit 7 - 6 - drive_fail_cnt[1:0] - determines how many update cycles are used for the drive fail detection function as shown in table 7.42, "drive_fail_cnt[1:0] bit decode" . this circuitry determines whether the fan can be driven to the desired tach target. table 7.39 gain register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 45h r/w gain register - - gaind[1:0] gaini[1:0] gainp[1:0] 2ah table 7.40 gain decode gaind or gainp or gaini [1:0] respective gain factor 10 00 1x 01 2x 1 0 4x (default) 11 8x table 7.41 fan spin up configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 46h r/w fan spin up configuration drive_fail_ cnt [1:0] nok ick spin_lvl[2:0] spinup_time [1:0] 19h table 7.42 drive_fail_cnt[1:0] bit decode drive_fail_cnt[1:0] number of update periods 10 00 disabled - the drive fail detection circuitry is disabled (default) 01 16 - the drive fail detection circuitry will count for 16 update periods
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 63 bit 5 - nokick - determines if the spin up routine will drive the fan to 100% duty cycle for 1/4 of the programmed spin up time before driving it at the programmed level. ? ?0? (default) - the spin up routine will drive the pwm to 100% for 1/4 of the programmed spin up time before reverting to the programmed spin level. ? ?1? - the spin up routine will not drive the pwm to 100%. it will set the drive at the programmed spin level for the entire duration of the programmed spin up time. bits 4 - 2 - spin_lvl[2:0] - determines the final drive level that is used by the spin up routine as shown in table 7.43, "spin level" . bit 1 -0 - spinup_time[1:0] - determines the maximum spin time that the spin up routine will run for (see section 6.8, "spin up routine" ). if a valid tachometer measurement is not detected before the spin time has elapsed, then an interrupt will be generated. when the rpm-based fan speed control algorithm is active, the fan driver will attempt to re-start the fan immediately after the end of the last spin up attempt. the spin time is set as shown in table 7.44 . 10 32 - the drive fail detection circuitry will count for 32 update periods 11 64 - the drive fail detection circuitry will count for 64 update periods table 7.43 spin level spin_lvl[2:0] spin up drive level 210 0 0 0 30% 0 0 1 35% 0 1 0 40% 0 1 1 45% 1 0 0 50% 1 0 1 55% 1 1 0 60% (default) 1 1 1 65% table 7.42 drive_fail_cnt[1:0] bit decode (continued) drive_fail_cnt[1:0] number of update periods 10
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 64 ? 2013 microchip technology inc. the fan spin up configuration register is software locked. 7.28 fan step register the fan step register, along with the update time, control the ramp rate of the fan driver response. the value of the registers represents the maximum step size each fan driver will take between update times (see section 7.24, "fan configuration 1 register" ). all modes of operation have the options to use the fan step register (and update times) for ramp rate control based on the fan configuration 2 register settings. the fan speed control algorithm will always use the fan step register settings (but see application note below). the fan step register is software locked. 7.29 fan minimum drive register the fan minimum drive register stores the minimum drive setting for the rpm-based fan speed control algorithm. this register is not used if the fsc is not active. the rpm-based fan speed control algorithm will not drive the fan at a level lower than the minimum drive unless the target tach target is set at ffh. (see section 7.32, "tach target register" .) during normal operation, if the fan stops for any reason (including low drive), the rpm-based fan speed control algorithm will attempt to restart the fan. setting the fan minimum drive registers to a setting that will maintain fan operation is a useful way to avoid potential fan oscillations as the control circuitry attempts to drive it at a level that cannot support fan operation. the fan minimum drive register is software locked. table 7.44 spin time spinup_time[1:0] total spin up time 10 0 0 250 ms 0 1 500 ms (default) 1 0 1 sec 1 1 2 sec table 7.45 fan step register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 47h r/w fan max step - - 32 16 8 4 2 1 10h table 7.46 minimum fan drive register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 48h r/w fan minimum drive 1286432168421 66h (40%)
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 65 7.30 valid tach count register the valid tach count register store the maximum tach reading register value to indicate that the the fan is spinning properly. the value is referenced at the end of the spin up routine to determine if the fan has started operating and decide if the device needs to retry. see equation [5] for translating the count to an rpm. if the tach reading register value exceeds the valid tach count register (indicating that the fan rpm is below the threshold set by this count), then a stalled fan is detected. in this condition, the algorithm will automatically begin its spin up routine. application note: the automatic invoking of the spin up routine only applies if the fan speed control algorithm is used. if the fsc is disabled, then the device will only invoke the spin up routine when the pwm setting changes from 00h. if a tach target setting is set above the valid tach count setting, then that setting will be ignored and the algorithm will use the current fan drive setting. the valid tach count register is software locked. 7.31 fan drive fail band registers the fan drive fail band registers store the number of tach counts used by the fan drive fail detection circuitry. this circuitry is activated when the fan drive setting high byte is at ffh. when it is enabled, the actual measured fan speed is compared against the target fan speed. this circuitry is used to indicate that the target fan speed at full drive is higher than the fan is actually capable of reaching. if the measured fan speed does not exceed the target fan speed minus the fan drive fail band register settings for a period of time longer than set by the drive_fail_cntx[1:0] bits then the drive_fail status bit will be set and an interrupt generated. table 7.47 valid tach count register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 49h r/w valid tach count 4096 2048 1024 512 256 128 64 32 f5h table 7.48 fan drive fail band registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 4ah r/w fan drive fail band low byte 168421 - - - 00h 4bh r/w fan drive fail band high byte 4096 2048 1024 512 256 128 64 32 00h
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 66 ? 2013 microchip technology inc. 7.32 tach target register the tach target register holds the target tachometer value that is maintained by the rpm-based fan speed control algorithm. the value in the tach target register will always reflect the current tach target value. if the look up table is active and configured to operate in rpm mode, then this register will be read only. writing to this register will have no affect and the data will not be stored. if the algorithm is enabled then setting the tach target register to ffh will disable the fan driver (set the pwm duty cycle to 0%). setting the tach target to any other value (from a setting of ffh) will cause the algorithm to invoke the spin up routine after which it will function normally. 7.33 tach reading register the tach reading register contents describe the current tachometer reading for the fan. by default, the data represents the fan speed as the number of 32khz clock periods that occur for a single revolution of the fan. equation [4] shows the detailed conversion from tach measurement (count) to rpm while equation [5] shows the simplified translation of tach reading register count to rpm assuming a 2-pole fan, measuring 5 edges, with a frequency of 32.768khz. these equations are solved and tabulated for ease of use in an17.4 rpm to tach counts conversion . table 7.49 tach target register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 4ch r/w fan tach target low byte 168421 - - - f8h 4dh r/w tach target 4096 2048 1024 512 256 128 64 32 ffh table 7.50 tach reading register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 4eh r fan tach 4096 2048 1024 512 256 128 64 32 ffh 4fh r fan tach low byte 168421 - - - f8h
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 67 7.34 look up table configuration register the look up table configuration register controls the setup information for the temperature to fan drive look up table. application note: this register is duplicated at 50h as well as 7dh for ease of programming using block write mode. example: set register 50h to unlock the table and register 7dh to lock the table. the external diode 2 channel is always used as the temperature 2 input to the fan control look up table. bit 7 - use_dts_p1 - this bit determines whether the pushed temperature 1 register is using dts data. ? ?0? (default) - the pushed temperature 1 register is not using dts data. the contents of the pushed temperature 1 registers are standard temperature data. ? ?1? - the pushed temperature 1 register is loaded with dts data. the contents of this register are automatically subtracted from a fixed value of 100c before being compared to the look up table threshold levels. bit 6 - use_dts_p2 - this bit determines whether the pushed temperature 2 register is using dts data. ? ?0? (default) - the pushed temperature 2 register is not using dts data. the contents of this register are standard 2?s complement temperature data. ? ?1? - the pushed temperature 2 register is loaded with dts data. the contents of this register are automatically subtracted from a fixed value of 100c before being compared to the look up table threshold levels. bit 5 - lut_lock - this bit locks updating the look up table entries and determines whether the look up table is being used. ? ?0? (default) - the look up table entries can be updated normally. the look up table will not be used while the look up table entries are unlocked. during this condition, the pwm output will not change states regardless of temperature or tachometer variation. where: [4] poles = number of poles of the fan (typically 2) n = number of edges measured (typically 5) m = the multiplier defined by the range bits [5] count = tach reading register value (in decimal) table 7.51 look up table configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 50h r/w lut configuration use_ dts_p1 use_ dts_p2 lut lock rpm / pwm push1_ cfg temp1_ cfg temp3_ cfg temp4_ cfg 00h 7dh rpm 1 poles ?? -------------------- n 1 ? ?? count 1 m ---- - ? ---------------------------------- 1,966,080 ? ? = rpm 3,932,160 m ? count -------------------------------------- =
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 68 ? 2013 microchip technology inc. ? ?1? - the look up table entries are locked and cannot be updated. the look up table is fully active and will be used based on the loaded values. the pwm output will be updated depending on the temperature and / or tach variations. application note: when the lut_lock bit is set at a logic ?0?, the pwm drive setting will be set at whatever value was last used by the rpm-based fan speed control algorithm or the look up table. bit 4 - rpm / pwm - this bit selects the data format for the lut drive settings. ? ?0? (default) - the look up table drive settings are rpm tach count values for use by the rpm- based fan speed control algorithm. the look up table drive settings should be loaded highest value to lowest value (to coincide with the inversion between tach counts and actual rpm). ? ?1? - the look up table drive settings are pwm duty cycle values and are used directly. the drive settings should be loaded lowest value to highest value. bit 3 - push1_cfg - determines whether the pwm input duty cycle is used instead of the pushed 1 temperature data when the temp1_cfg bit is set. ? ?0? (default) - the pushed temperature 1 register can be written via the smbus and will hold a temperature value. the pwm input duty cycle is not used. ? ?1? - if the temp1_cfg or temp3_cfg bit is set, the pwm input duty cycle will be used. the pushed temperature 1 register can be written via the smbus and will hold a temperature value but will not be used. application note: if the pushed temperature 1 data is configured to hold the pwm input duty cycle and is used in the look up table, then the look up table threshold levels must be programmed in the same format as the pwm input duty cycle - see section 7.5 and section 7.35 . bit 2 - temp1_cfg - determine the temperature channel that is used for the temperature 1 inputs to the look up table. ? ?0? (default) - the external diode 1 channel is used by the fan look up table. ? ?1? - either the data written into the pushed temperature 1 register or the data in the pwm input duty cycle register is used by the fan look up table as determined by the push1_cfg bit. bit 1 - temp3_cfg - determine the temperature channel that is used for the temperature 3 inputs to the look up table. ? ?0? (default) - the external diode 3 channel is used by the fan look up table (if enabled). ? ?1? - either the data written into the pushed temperature 1 register or the data in the pwm input duty cycle register is used by the fan look up table as determined by the push1_cfg bit. bit 0 - temp4_cfg - determine the temperature channel that is used for the temperature 4 inputs to the look up table. ? ?0? (default) -the internal diode channel is used by the fan look up table. ? ?1? - the data written into the pushed temperature 2 register is used by the fan look up table. 7.35 look up table registers table 7.52 look up table registers addr r/w register rpm / pwm b7 b6 b5 b4 b3 b2 b1 b0 default 51h r/w lut drive setting 1 ?0? 4096 2048 1024 512 256 128 64 32 fbh ?1? 128 64 32 16 8 4 2 1
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 69 the look up table registers hold the 40 entries of the look up table that control the drive of the pwm. as the temperature channels are updated, the measured value for each channel is compared against the respective entries in the look up table and the associated drive setting is loaded into an internal shadow register and stored. the bit weighting for temperature inputs represents c and is compared against the measured data. note that the lut entry does not include a sign bit. the look up table does not support negative temperature values and the msbit should not be set for a temperature input. application note: when the pwm input duty cycle values are used, then the bit weighting represents a unit- less threshold that does not corresponded to specific temperature values. it is used to drive the fan speed based on external temperatures known to a separate microcontroller driving the pwm_in pin. each temperature channel threshold for a single ?column? shares the same hysteresis value; however, each temperature input has a different hysteresis value. when the measured temperature for any of the channels meets or exceeds the programmed threshold, the drive setting associated with that threshold is used. the temperature must drop below the threshold minus the hysteresis value before the drive setting will be set to the previous value. 52h r/w lut temp 1 setting 1 x - 64 32 16 8 4 2 1 7fh (127c) 53h r/w lut temp 2 setting 1 x - 64 32 16 8 4 2 1 7fh (127c) 54h r/w lut temp 3 setting 1 x - 64 32 16 8 4 2 1 7fh (127c) 55h r/w lut temp 4 setting 1 x - 64 32 16 8 4 2 1 7fh (127c) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74h r/w lut drive setting 8 ?0? 4096 2048 1024 512 256 128 64 32 92h ?1? 128 64 32 16 8 4 2 1 75h r/w lut temp 1setting 8 x - 64 32 16 8 4 2 1 7fh (127c) 76h r/w lut temp 2 setting 8 x - 64 32 16 8 4 2 1 7fh (127c) 77h r/w lut temp 3 setting 8 x - 64 32 16 8 4 2 1 7fh (127c) 78h r/w lut temp 4 setting 8 x - 64 32 16 8 4 2 1 7fh (127c) 79h r/w lut temp 1 hysteresis x - - - 168421 0ah (10c) 7ah r/w lut temp 2 hysteresis x - - - 168421 0ah (10c) 7bh r/w lut temp 3 hysteresis x - - - 168421 0ah (10c) 7ch r/w lut temp 4 hysteresis x - - - 168421 0ah (10c) table 7.52 look up table registers (continued) addr r/w register rpm / pwm b7 b6 b5 b4 b3 b2 b1 b0 default
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 70 ? 2013 microchip technology inc. if the rpm-based fan speed control algorithm is used, the tach target is updated after every conversion. it is always set to the minimum tach target that is stored by the look up table. the pwm duty cycle is updated based on the rpm-based fan speed control algorithm configuration settings. if the rpm-based fan speed control algorithm is not used, then the output pwm duty cycle is updated after every conversion. it is set to the maximum duty cycle that is stored by the look up table. if the measured temperature reading on all channels is less than the lowest threshold setting minus the appropriate hysteresis setting, then the fan driver will be set to 0% duty cycle and the fan will be disabled. 7.36 software lock register the software lock register controls the software locking of critical registers. this register is software locked. bit 0 - lock - this bit acts on all registers that are designated swl. when this bit is set, the locked registers become read only and cannot be updated. ? ?0? (default) - all swl registers can be updated normally. ? ?1? - all swl registers cannot be updated and a hard-reset is required to unlock them. 7.37 product features register the product features register indicates which pin selected functionality is enabled. bits 5-3 - addr_sel[2:0] - indicates the address that is decoded by the addr_sel pin as shown in table 7.55, "addr_sel[2:0] encoding" . table 7.53 software lock addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default efh r/w software lock - - - - - - - lock 00h table 7.54 product features register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default fch r product features - - addr_sel[2:0] shdn_sel[2:0] 00h table 7.55 addr_sel[2:0] encoding addr_sel[2:0] smbus address 210 0 0 0 0101_100(r/w) 0 0 1 0101_101(r/w) 0 1 0 0101_110(r/w)
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 71 bits 2-0 - shdn_sel[2:0] - indicate the function ality enabled by the shdn_sel pin as shown in table 7.56, "shdn_sel[2:0] encoding" . 7.38 product id register the product id register contains a unique 8-bit word that identifies the product. 0 1 1 1001_100(r/w) 1 0 0 1001_101(r/w) 1 0 1 1001_000(r/w) table 7.56 shdn_sel[2:0] encoding shdn_sel[2:0] diode mode other features 210 0 0 0 external diode 1 simple mode - beta compensation disabled, rec disabled - recommended for amd cpu diodes none 0 0 1 external diode 1 diode mode - beta compensation disabled, rec enabled none 0 1 0 external diode 1 transistor mode - beta compensation enabled, rec enabled - - recommended for intel 45nm and 65mn cpu diodes none 0 1 1 internal diode transistor mode - beta compensation enabled, rec enabled none 1 0 0 external diode 2 transistor mode - beta compensation enabled, rec enabled none 1 0 1 external diode 1 transistor mode - beta compensation enabled, rec enabled none table 7.57 product id register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default fdh r product id register 00100100 2eh table 7.55 addr_sel[2:0] encoding (continued) addr_sel[2:0] smbus address 210
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 72 ? 2013 microchip technology inc. 7.39 manufacturer id register the manufacturer id register contains an 8-bit word that identifies microchip. 7.40 revision register the revision register contains an 8-bit word that identifies the die revision. table 7.58 manufacturer id register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default feh r manufacturer id 01011101 5dh table 7.59 revision register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default ffh r revision 1 0 0 0 0 0 0 1 81h
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 73 chapter 8 typical operating curves the following typical operating curves are included: ? supply current vs. temperature ? supply current vs. supply voltage ? temperature error vs. series resistance ? temperature error vs. ambient temperature ? temperature error vs. supply voltage ? fan tach accuracy vs. temperature ? fan tach accuracy vs. supply voltage ? pwm output frequency vs. supply voltage ? pwm output frequency vs. temperature ? fsc operation ? look up table operation - pwm / direct drive
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 74 ? 2013 microchip technology inc.
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 75
ds20005251a-page 76 ? 2013 microchip technology inc. rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 77 chapter 9 package drawing 9.1 EMC2113 package information figure 9.1 16-pin qfn 4mm x 4mm package dimensions figure 9.2 16-pin qfn 4mm x 4mm pcb footprint
ds20005251a-page 78 ? 2013 microchip technology inc. rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet figure 9.3 16-pin qfn 4mm x 4mm package drawing
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 79 9.2 package markings figure 9.4 EMC2113 package markings
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 80 ? 2013 microchip technology inc. appendix a look up table operation the EMC2113 uses a look-up table to apply a user-programmable fan control profile based on measured temperature to the fan driver. in this look-up table, each temperature channel is allowed to control the fan drive output independently (or jointly) by programming up to eight pairs of temperature and drive setting entries. the user programs the look-up table based on the desired operation. if the rpm-based fan speed control algorithm is to be used (see section 6.6 ), then the user must program an rpm target for each temperature setting of interest. alternately, if the rpm-based fan speed control algorithm is not to be used, then the user must program a drive setting for each temperature setting of interest. if the measured temperature on the external diode channel meets or exceeds any of the temperature thresholds for any of the channels, the fan output will be automatically set to the desired setting corresponding to the exceeded temperature. in cases where multiple temperature channel thresholds are exceeded, the highest fan drive setting will take precedence. when the measured temperature drops to a point below a lower threshold minus the hysteresis value, the fan output will be set to the corresponding lower set point. the following sections show examples of how the look up table is used and configured. each look up table example uses the fan 1 look up table registers configured as shown in table a.1 . a.1 example #1 this example does not use the rpm-based fan speed control algorithm. instead, the look up table is configured to directly set a pwm setting based on the temperature of four of its measured inputs. the configuration is set as shown in table a.2, "look up table example #1 configuration" . once configured, the look up table is loaded as shown in section table a.3, "fan speed control table example #1" . table a.4 shows three temperature configurations using the settings in table a.3 and the final pwm output drive setting that the look up table will select. table a.1 look up table format step temp 1 temp 2 temp 3 temp 4 lut drive 1 lut temp 1 setting 1 (52h) lut temp 2 setting 1 (53h) lut temp 3 setting 1 (54h) lut temp 4 setting 1 (55h) lut drive setting 1 (51h) 2 lut temp 1 setting 2 (57h) lut temp 2 setting 2 (58h) lut temp 3 setting 2 (59h) lut temp 4 setting 2 (5ah) lut drive setting 2 (56h) 3 lut temp 1 setting 3 (5ch) lut temp 2 setting 3 (5dh) lut temp 3 setting 3 (5eh) lut temp 4 setting 3 (5fh) lut drive setting 3 (5bh) 4 lut temp 1 setting 4 (61h) lut temp 2 setting 4 (62h) lut temp 3 setting 4 (63h) lut temp 4 setting 4 (64h) lut drive setting 4 (60h) 5 lut temp 1 setting 5 (66h) lut temp 2 setting 5 (67h) lut temp 3 setting 5 (68h) lut temp 4 setting 5 (69h) lut drive setting 5 (65h) 6 lut temp 1 setting 6 (6bh) lut temp 2 setting 6 (6ch) lut temp 3 setting 6 (6dh) lut temp 4 setting 6 (6eh) lut drive setting 6 (6ah) 7 lut temp 1 setting 7 (70h) lut temp 2 setting 7 (71h) lut temp 3 setting 7 (72h) lut temp 4 setting 7 (73h) lut drive setting 7 (6fh) 8 lut temp 1 setting 8 (75h) lut temp 2 setting 8 (76h) lut temp 3 setting 8 (77h) lut temp 4 setting 8 (78h) lut drive setting 8 (74h)
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 81 a.1.1 lut configuration bit description bit 7 - use_dts_f1 = ?0b? tells the circuitry that the forced temperature 1 register data is not in dts format. bit 6 - use_dts_f2 = ?0b? tells the circuitry that the forced temperature 2 register data is not in dts format. bit 5 - lut_lock = ?1b? tells the circuitry that the lut is programmed and is active. this bit must be set for the lut to function. bit 4 - rpm / pwm = ?1b? tells the look up table that the fsc algorithm is not used and that the lut target values will be pwm drive settings instead of tach target settings. bit 3 - push1_cfg = ?0b? tells the circuitry that the lut should referenced the forced temperature data instead of the pwm input duty cycle data. this is the default setting. bit 2 - temp1_cfg = ?0b? tells the lut to reference the external diode 1 data instead of forced temperature 1 data. this is the default setting. bit 1 - temp3_cfg = ?0b? tells the lut to reference the external diode 3 data instead of forced temperature 1 data. this is the default setting. bit 0 - temp4_cfg = ?0b? tells the lut to reference the internal diode data instead of forced temperature 2 data. this is the default setting. note: the values shown in table a.3 are example settings. all the cells in the look-up table are programmable via smbus. table a.2 look up table example #1 configuration addr register b7 b6 b5 b4 b3 b2 b1 b0 setting 50h lut configuration use_ dts_f1 use_ dts_f2 lut_ lock rpm / pwm push1_ cfg temp1_ cfg temp3_ cfg temp4_ cfg c0h 00110 000 table a.3 fan speed control table example #1 fan speed step # external diode 1 temperature (cpu) external diode 2 temperature (gpu) external diode 3 temperature (skin) internal diode temperature (ambient) pwm settings 135 o c60 o c30 o c40 o c0% 240 o c70 o c35 o c45 o c 30% 350 o c75 o c40 o c50 o c 40% 460 o c80 o c45 o c55 o c 50% 570 o c85 o c50 o c60 o c 60% 680 o c90 o c55 o c65 o c 70% 790 o c95 o c60 o c70 o c 80% 8 100 o c 100 o c65 o c75 o c 100%
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 82 ? 2013 microchip technology inc. a.2 example #2 this example uses the rpm-based fan speed control algorithm. the spin level (used by the spin up routine) should be changed to 40% drive for a total spin time of 1 second. for all other rpm configuration settings, the default conditions are used. for control inputs, it uses the external diode 1 channel normally, the external diode 2 channel normally, and both pushed temperature registers in dts format. the configuration is set as shown in table a.5, "look up table example #2 configuration" while table a.6, "fan speed control table example #2" shows how the table is loaded. note that when using dts data, the use_dts_f1 and / or use_dts_f2 bits should be set. the pushed temperature registers are loaded with the normal dts values as received by the processor. when the dts value is used by the look up table, the value that is stored in the pushed temperature register is subtracted from a fixed temperature of 100c. this resultant value is then compared against the look up table thresholds normally. when programming the look up table, it is necessary to take this translation into account or else incorrect settings may be selected. a.2.1 fan spin up configuration bit description bits 7-6 - drive_fail_cnt[1:0] = ?00b? tells the circuitry that the drive fail detection circuitry is not enabled. this is the default setting. bit 5 - nokick = ?0b? tells the circuitry that if than spin up routine is invoked, it will drive to 100% duty cycle for 25% of the spin up time. this is the default setting. bits 4-2 - spin_lvl[2:0] = ?010b? tells the circuitry that if the spin up routine is invoked, it should run at 40% drive. table a.4 fan speed determination for example #1 (using settings in table a.3 ) external diode 1 temperature (cpu) external diode 2 temperature (gpu) external diode 3 temperature (skin) internal diode temperature (ambient) pwm result example 1: 82c 82c 48c 58c 70% (cpu temp requires highest drive) example 2: 82c 97c 62c 58c 80% (gpu and skin require highest drive) example 3: 82c 97c 62c 75c 100% (internal temp requires highest drive) table a.5 look up table example #2 configuration addr register b7 b6 b5 b4 b3 b2 b1 b0 setting 46h fan spin up configuration drive_fail_cnt [1:0] nokick spin_lvl[2:0] spinup_time [1:0] 0ah 00001010 50h lut configuration use_ dts_f1 use_ dts_f2 lut_ lock rpm / pwm push1_ cfg temp1_ cfg temp3_ cfg temp4_ cfg e5h 11100011
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 83 bits 1-0 - spinup_time[1:0] = ?10b? tells the circuitry that if the spin up routine is invoked, it will run at 100% duty cycle for 250ms and at 40% duty cycle for 750ms for a total spin up time of 1s. a.2.2 lut configuration - bit description 7 - use_dts_f1 = ?1b? tells the circuitry that the data in the pushed temperature 1 register is in dts format which means that the value in the register is equal to 100c - cpu temp. bit 6 - use_dts_f2 = ?1b? tells the circuitry that the data in the pushed temperature 1 register is in dts format which means that the value in the register is equal to 100c - cpu temp. bit 5 - lut_lock = ?1b? tells the circuitry that the lut is programmed and is active. this bit must be set for the lut to function. bit 4 - rpm_pwm = ?0b? tells the lut circuitry that the fsc algorithm is active and that the lut values are tach target settings. this is the default setting. bit 3 - push1_cfg = ?0b? tells the circuitry that the lut should referenced the forced temperature data instead of the pwm input duty cycle data. this is the default setting. bit 2 - temp1_cfg = ?0b? tells the lut to reference the external diode 1 data instead of forced temperature 1 data. bit 1 - temp3_cfg = ?1?b tells the look up table to reference the forced temperature 1 data instead of the external diode 3 data. bit 0- temp4_cfg = ?1b? tells the look up table to reference the forced temperature 2 data instead of the internal diode data. note: the values shown in table a.6 are example settings. all the cells in the look-up table are programmable via smbus. table a.6 fan speed control table example #2 fan speed step # external diode 1 temperature (cpu) external diode 2 temperature (gpu) pushed temperature setting (dts1) pushed temperature setting (dts2) tach target high byte 135 o c65 o c50 o c40 o c efh (1028 rpm) 240 o c75 o c55 o c45 o c a3h (1508 rpm) 350 o c85 o c60 o c50 o c 7ah (2014 rpm) 460 o c90 o c65 o c55 o c 62h (2508 rpm) 570 o c95 o c70 o c60 o c 52h (2997 rpm) 680 o c 100 o c75 o c65 o c 3dh (4029 rpm) 790 o c 105 o c80 o c80 o c 31h (5016 rpm) 8 100 o c110 o c85 o c 100 o c 29h (5994 rpm)
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 84 ? 2013 microchip technology inc. a.3 example #3 this example uses the rpm-based fan speed control algorithm with default settings. for control inputs, it uses the external diode 1 channel normally, the external diode 2 channel normally, the pwm input instead of external diode 3, and the internal diode. the configuration is set as shown in table a.8 while table a.9 shows how the table is loaded. a.3.1 lut configuration bit description bit 7 - use_dts_f1 = ?0b? tells the circuitry that the forced temperature 1 register data is not in dts format. bit 6 - use_dts_f2 = ?0b? tells the circuitry that the forced temperature 2 register data is not in dts format. bit 5 - lut_lock = ?1b? tells the circuitry that the lut is programmed and is active. this bit must be set for the lut to function. bit 4 - rpm_pwm = ?0b? tells the lut circuitry that the fsc algorithm is active and that the lut values are tach target settings. this is the default setting. bit 3 - push1_cfg = ?1b? tells the look up table to reference the pwm input duty cycle instead of the pushed temperature 1 register. bit 2 - temp1_cfg = ?0b? tells the lut to reference the external diode 1 data instead of forced temperature 1 data. this is the default setting. table a.7 fan speed determination for example #2 (using settings in table a.6 ) external diode 1 temperature (cpu) external diode 2 temperature (gpu) pushed temperature (dts1) pushed temperature (dts2) pwm result example 1: 75c 75c 35c (translated as 65c) 50c (translated as 50c) 52h (2997 rpm) - cpu requires highest target example 2: 75c 90c 15c (translated as 85c) 20c (translated as 80c) 29h (5994 rpm) - dts1 requires highest target example 3: 75c 97.25c 30c (translated as 70c) 5c (translated as 95c) 31h (5016 rpm) - dts2 requires highest target table a.8 look up table example #3 configuration addr register b7 b6 b5 b4 b3 b2 b1 b0 setting 90h lut configuration use_ dts_f1 use_ dts_f2 lut_ lock rpm / pwm push1_ cfg temp1_ cfg temp3_ cfg temp4_ cfg 2ah 00101010
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 85 bit 1 - temp3_cfg = ?1b? tells the look up table to reference pushed temperature 1 instead of external diode 3, except that push1_cfg re-directs the logic to reference the pwm input duty cycle register instead. bit 0 - temp4_cfg = ?0b? tells the lut to reference the internal diode data instead of forced temperature 2 data. this is the default setting. note: the values shown in table a.9 are example settings. all the cells in the look-up table are programmable via smbus. table a.9 fan speed control table example #3 fan speed step # external diode 1 temperature (cpu) external diode 2 temperature (gpu) pwm duty cycle internal diode tach target 135 o c65 o c 20% duty cycle (1ah) 40 o c efh (1028 rpm) 240 o c75 o c 30% duty cycle (26h) 45 o c a3h (1508 rpm) 350 o c85 o c 40% duty cycle (33h) 50 o c 7ah (2014 rpm) 460 o c90 o c 50% duty cycle (40h) 55 o c 62h (2508 rpm) 570 o c95 o c 60% duty cycle (4dh) 60 o c 52h (2997 rpm) 680 o c 100 o c 70% duty cycle (5ah) 65 o c 3dh (4029 rpm) 790 o c 105 o c 80% duty cycle (66h) 80 o c 31h (5016 rpm) 8 100 o c110 o c 90% duty cycle (73h) 100 o c 29h (5994 rpm) table a.10 fan speed determination for example #2 (using settings in table a.9 ) external diode 1 temperature (cpu) external diode 2 temperature (gpu) pwm input duty cycle internal diode pwm result example 1: 75c 75c 45% duty cycle 50c 52h (2997 rpm) - cpu requires highest target example 2: 75c 90c 85% duty cycle 70c 31h (5016 rpm) - pwm requires highest target example 3: 75c 97.25c 75% duty cycle 95c 31h (5016 rpm) - dts2 requires highest target
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ds20005251a-page 86 ? 2013 microchip technology inc. datasheet revision history revision history revision level & date section/figure/entry correction rev a replaces the previous smsc version rev. 1.2 rev. 1.2 (10-08-09) chapter 8, typical operating curves added chapter. rev. 1.1 (07-21-09) section 6.1.1, "sys_shdn pin" added section to describe sys_shdn pin operation. section 6.12, "alert pin" added section to describe aler t pin operation. cover and features updated text to include aler t pin and temperature limits general description modified bullet under ?temperature look-up table? from: ?allows programmed fan response to temperature? to: ?allows external pwm input (50hz-40khz) as an additional temperature input? rev. 1.1 (05-22-09) table 4.2, "electrical specifications" ?tachometer setting accuracy? changed to ?rpm control accuracy? value in max column changed from: ?+/- 3%? to: ?+/- 2%? rev. 1.1 (05-15-09) table 4.1, "absolute maximum ratings" updated table for 5v tolerant pins issue table 4.3, "smbus electrical specifications" updated electrical specifications for supply current section 7.40, "revision register" updated revision history appendix b ?rpm to tachometer count look up tables? removed appendix b and added reference to an17.4 rpm to tach counts conversion, which includes more information. rev. 1.0 (02-11-09) initial release of datasheet
rpm-based fan controller with multiple temperature zones & hardware thermal shutdown datasheet ? 2013 microchip technology inc. ds20005251a-page 87 note the following details of the code protection feature on microchip devices: ? microchip products meet the specification contained in their particular microchip data sheet. ? microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. ? there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specifications contained in microchip?s data sheets. most likely, the person doing so is engaged in theft of intellectual property. ? microchip is willing to work with the customer who is concerned about the integrity of their code. ? neither microchip nor any other semiconductor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as ?unbreakable.? code protection is constantly evolving. we at microchip are committed to continuously improving the code protection features of our products. attempts to break microchip?s code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. microchip make s no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, includ ing but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safety applications is entirely at the buyer?s risk, and the buyer agrees to defend, i ndemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, implic- itly or otherwise, under any microchip intellectual property rights. trademarks the microchip name and logo, the microchip logo, dspic, flashflex, k ee l oq , k ee l oq logo, mplab, pic, picmicro, picstart, pic 32 logo, rfpic, sst, sst logo, superflash and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. a nd other countries. filterlab, hampshire, hi-tech c, linear active thermistor, mtp, seeval and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. silicon storage technology is a registered trademark of microchip technology inc. in other countries. analog-for-the-digital age, application maestro, bodycom, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, dspicworks, dsspeak, ecan, economonitor, fansense, hi-tide, in-circuit serial programming, icsp, mindi, miwi, mpasm, mpf, mplab certified logo, mplib, mplink, mtouch, omniscient code generation, picc, picc-18, picdem, picdem.net, pickit, pictail, real ice, rflab, select mode, sqi, serial quad i/o, total endurance, tsharc, uniwindriver, wiperlock, zena and z- scale are trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of microchip technology incorporated in the u.s.a. gestic and ulpp are registered trademarks of microchip technology germany ii gmbh & co. kg, a subsidiary of microchip technology inc., in other countries. a more complete list of registered trademarks and common law trademarks owned by standard microsystems corporation (?smsc?) is available at: www.smsc.com. the absence of a trademark (name, logo, etc.) from the list does not constitute a waiver of any intellectual property rights that smsc has established in any of its trademarks. all other trademarks mentioned herein are property of their respective companies. ? 2013, microchip technology incorporated, printed in the u.s.a., all rights reserved. isbn: 9781620776506 microchip received iso/ts-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the company?s quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified.
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