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general description the max6620 evaluation system (MAX6620EVCMAXQU+)consists of the max6620 evaluation kit (max6620evkit+) and the maxim cmaxqusb+ command module. windows 2000/xp/vista -compatible software is also available for use with the max6620 evaluation system (evsystem) and can be downloaded from the maxim website (www.maxim-ic.com/evkitsoftware). the max6620 evaluation kit (ev kit) is a fully assembled and tested printed-circuit board (pcb) that evaluates the max6620 quad linear fan-speed controller. the max6620 controls the speeds of up to four fans using four independent linear voltage outputs. the ev kit includes 3-pin fan headers to allow easy fan connection and an i 2 c/smbus-compatible interface that allows for software control of the drive voltage, tachometercount, fan configuration, and fan dynamics. the maxim cmaxqusb command module provides the i 2 c/smbus interface and is connected to the com- puter through the universal serial bus (usb) port. themax6620 ev kit software provides a graphical user interface (gui) for exercising the max6620 features. features ? 3v to 5.5v supply voltage range ? controls up to four independent fans with linear(dc) drive ? uses four external low-cost pnp passtransistors ? fan-fail output ? i 2 c/smbus-compatible interface ? fully assembled and tested evaluate: max6620 max6620 evaluation kit/evaluation system ________________________________________________________________ maxim integrated products 1 19-4069; rev 0; 3/08 component lists for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information part type max6620evkit+ ev kit MAX6620EVCMAXQU+ ev system part qty description max6620evkit+ 1 max6620 ev kit cmaxqusb+ 1 i 2 c/smbus interface command module windows vista is a registered trademark of microsoft corp. smbus is a trademark of intel corp. + denotes lead-free and rohs-compliant. max6620 ev system designation qty description c1?6 6 0.1? ?0%, 16v x7r ceramiccapacitors (0603) murata grm188r71c104k tdk c1608x7r1c104k j1 1 2 x 10 right-angle receptacle j2?5 4 3-pin headers, 0.1in pitch, vertical,friction lock ju1 1 2-pin header ju2?u6 5 3-pin headers max6620 ev kit designation qty description q1?4 4 20v, 1a, pnp silicon epitransistors on semi bcp69t1g r1?4 4 2.7k ?% resistors (0603) r5, r6 0 not installed, resistors (0603) r7 1 4.7k ?% resistor (0603) r8?11 4 10k ?% resistors (0603) u1 1 quad linear fan-speed controller(28 tqfn-ep*, 5mm x 5mm x 0.8mm) maxim max6620ati+ y1 1 standard 32.768khz quartzcrystal, 12.5pf load capacitance hong kong x?als 3tk0327680d1cf5gx-0a 6 shunts 1 pcb: max6620 evaluation kit+ * ep = exposed pad. downloaded from: http:///
quick start recommended equipment before beginning, the following equipment is needed: user-supplied pc running windows 2000/xp/vista available usb port 5v/2a or 12v/2a dc power supply (vfan) one to four brushless dc fans max6620 ev system max6620 ev kitcmaxqusb+ command module (usb cable included) note: in the following sections, software-related items are identified by bolding. text in bold refers to items directly from the ev kit software. text in bold and underlined refers to items from the windows 2000/xp/vista operating system. procedure the max6620 ev kit is fully assembled and tested.follow the steps to verify board operation. caution: do not turn on the power supply until all connectionsare completed. 1) on the cmaxqusb command module, ensure that the shunt on jumper ju1 is in the 3.3v position. 2) to enable the on-board vcc supply, ensure that a shunt is installed between pins 2-3 on jumper ju2on the max6620 ev kit. also, verify that the shunt on ju1 of the ev kit is uninstalled. 3) carefully connect the boards by aligning the 20-pin connector of the max6620ev kit with the 20-pinheader on the cmaxqusb interface board. gently press them together. 4) connect one to four fans appropriately. note: the ev kit is configured for use with fans that typicallydraw up to 400ma. when using larger fans, a differ- ent pass transistor might be required for proper operation. 5) with power off, connect the positive terminal of the dc power supply to the vfan pad, and the groundterminal to the fan_gnd pad next to vfan. 6) connect the usb cable from the computer? type-a usb port to the cmaxqusb board? type-b usbport. 7) visit www.maxim-ic.com/evkitsoftware to download the latest version of the max6620 ev kit softwareand install it on your computer by running the install.exe program. the program files are copied and icons are created in the windows start menu. 8) turn on the power supply and set it to 5v or 12v, as appropriate. 9) start the max6620 program by opening its icon in the start menu. 10) normal device operation is verified when cmaxqusb hw: connected. max6620 device connected. is displayed at the bottom left of the max6620 ev kitmain window (figure 1). evaluate: max6620 max6620 evaluation kit/evaluation system 2 _______________________________________________________________________________________ component suppliers supplier phone website hong kong xtals ltd. +852-3511-2388 www.hongkongcrystal.com murata mfg. co., ltd. 770-436-1300 www.murata.com on semiconductor 602-244-6600 www.onsemi.com tdk corp. 847-803-6100 www.component.tdk.com max6620 ev kit files file description install.exe installs the ev kit files on your computer max6620.exe application program troubleshooting_usb.pdf usb driver installation help file ftd2xx.inf usb driver file uninst.ini uninstalls the ev kit software note: indicate that you are using the max6620 when contacting these component suppliers. downloaded from: http:///
detailed description of software user-interface panel the program? main window contains two tabs, fan status and fan configuration/dynamics , which pro- vide controls for the max6620 ev kit software? config-urable features. the fan status tab sheet (figure 1) provides controls for the global configuration regis- ter, tach count , drive voltage , targets , and faults . the fan configuration/dynamics tab sheet (figure 2) provides controls for fan_ configuration and fan_ dynamics . a status box is also provided at the bottom of the program? main window and is used to verifycommand module and device connectivity. vfan input setting (5v or 12v) the max6620 ev kit software can be configured to workwith 5v or 12v dc fans. manually select the appropriate fan voltage from the vfan drop-down list (figure 1). the default setting is for use with 12v dc fans. global configuration the global configuration group box contains several functions that control general operation. the i2c bus timeout checkbox resets the interface if sda is low for more than 35ms, when enabled. the fans to 100% on failure checkbox, when checked, drives the fans to full-scale drive voltage when a fan failure is detected.the external xtal checkbox toggles between the inter- nal oscillator (unchecked) and the 32.768 khz on-boardcrystal (checked). evaluate: max6620 max6620 evaluation kit/evaluation system _______________________________________________________________________________________ 3 figure 1. max6620 ev kit software?an status tab downloaded from: http:///
i2c watchdog the i2c watchdog period drop-down list controls the period that the watchdog monitors sda and scl forvalid i 2 c transactions. if there are no valid transactions between the master and the max6620 within the watch-dog period, all fan output voltages go to full-scale drive voltage. the i2c watchdog status indicator monitors whether a watchdog fault has occurred. this bit iscleared when read. tach count and drive voltage with polling enabled, the tach count group box auto- matically reads the tachometer count for each corre-sponding fan. with polling disabled, press the read buttons next to each fan? tach_ count label. with polling enabled, the drive voltage group box automatically reads the drive voltage for each corre-sponding fan. with polling disabled, press the read buttons next to each fan? drive voltage label. when afan is driven at full-scale voltage, the drive voltage label text is displayed the in red font. evaluate: max6620 max6620 evaluation kit/evaluation system 4 _______________________________________________________________________________________ figure 2. max6620 ev kit software?an configuration/dynamics tab downloaded from: http:///
targets in rpm mode, the target tach_ count sets the desired tachometer count for each corresponding fan.the max6620 then adjusts the fan drive voltage to achieve this tachometer count. in dac mode, this fea- ture has no effect. in dac mode, write the desired fan drive voltage to the target drive voltage_ edit box. the max6620 then drives the fan with this voltage. faults fan_ status fan faults are detected through the fan fault registerand displayed in the faults group box. when a fault is detected, the fan_ status label changes from ok to fault and displays the text in red font. since these bits latch until they are cleared by reading, the option to pollbits automatically, or manually read status, is offered by toggling the enable polling checkbox. refer to the max6620 ic data sheet for more information regardingtypes of faults. fan_ fault mask the fan_ fault mask checkboxes give the option to mask faults on selected fans from asserting thefan_fail hardware option. when checked, bits do not assert the fan_fail output. faults are still indicated through fan_ status . fan_ configuration the fan_ configuration group boxes (figure 2) con- figure the corresponding fan? spin-up conditions, tach input enable settings, and set either rpm or dac mode. rpm/dac mode select the appropriate rpm or dac radio button to set the fan to either rpm or dac mode. in rpm mode, thefan drive voltage is adjusted to produce the tachometer count value in the fan_ target tach count register. in dac mode, the fan drive voltage is set by the value in the fan_ target drive voltage register. spin-up the spin-up drop-down list controls the period of time that the fan is driven at full-scale voltage before reduc-ing the drive to the selected value. the default is set through jumper ju6. tach settings the tach input enable checkboxes enable the tach input function and fan-fault detection. when enabled,select the appropriate radio button to set the tach input to either tach count or locked rotor . when using locked rotor input, the polarity can be set at high or low. fan_ dynamics the fan_ dynamics group box contains controls for individual fan speed range and dac rate-of-change.the # of tach cycles counted drop-down list sets the number of complete tachometer cycles used for count-ing the number of 8192hz clock cycles. for example, by default, this number is set to 4, which means that the max6620 counts the number of 8192hz clock cycles in four complete tachometer cycles. the dac rate of change drop-down list determines the time interval between output voltage increments. notethat in rpm mode, a setting of zero would result in an unstable feedback loop, so a default of 0.0625 is in effect when zero is selected. evaluate: max6620 max6620 evaluation kit/evaluation system _______________________________________________________________________________________ 5 downloaded from: http:///
evaluate: max6620 simple i 2 c/smbus commands there are two methods for communicating with themax6620, through the normal user-interface panel (figures 1 and 2), or through the smbus commands avail- able by selecting the interface diagnostic window menu item from the action menu bar. the maxim command module interface window pops up and includes a 2-wire interface tab that allows for execution of the smbussendbyte() and smbusquick() commands. the smbus dialog boxes accept numeric data in bina-ry, decimal, or hexadecimal. hexadecimal numbers should be prefixed by $ or 0x. binary numbers must be exactly eight digits. see figure 3 for an illustration of this tool. detailed description of hardware jumper settings several jumper settings in the following tables illustratefeatures of the max6620 ev kit. oscillator selection the max6620 ev kit gives the option to use themax6620? internal oscillator or external on-board 32.768khz quartz crystal (see table 1). by default, the chip? internal oscillator is used. for increased accura- cy, an external 32.768khz quartz crystal can be applied by installing jumper ju1. max6620 evaluation kit/evaluation system 6 _______________________________________________________________________________________ table 1. jumper ju1 functions shunt position x1 pin oscillator installed connected to x2 through y1 external 32.768kh quart crystal not installed* open internal oscillator used *default position. figure 3. interface diagnostic window downloaded from: http:///
vcc power supply the max6620 gives the option to power vcc throughthe cmaxqusb module or through an external supply. this can be accomplished through setting jumper ju2 (see table 2). by default, the max6620? vcc supply is powered through the cmaxqusb module, eliminating the need for an external vcc supply. i 2 c slave address selection the max6620 is programmable to one of three i 2 c slave addresses through jumper ju3 (see table 3). theaddress is defined as the 7 most significant bits (msbs) followed by the read/write bit. i 2 c watchdog (wd) startup conditions the max6620 i 2 c watchdog function (see table 4) monitors sda and scl when enabled at startup byconfiguring jumper ju4. when this feature is enabled and 10s elapse without a valid i 2 c transaction, the fan drive goes to 100%. the watchdog function is disabledby default. dac startup conditions the max6620 samples the dac_start input whenpower is first applied and sets the power-up value for the fan drive voltage based on jumper ju5 configura- tion. by default, the dac_start pin is connected to vcc, setting the initial fan drive voltage to vfan. initial spin-up behavior the initial spin-up behavior of the max6620 is sampledat the input of spin_start when power is first applied. initial spin-up behavior can be set through jumper ju6 at power-up (see table 6 for spin-up configuration). it is also possible to modify spin-up behavior by writing appropriate settings to the max6620? registers. by default, the initial spin-up feature is disabled. evaluate: max6620 max6620 evaluation kit/evaluation system _______________________________________________________________________________________ 7 table 3. jumper ju3 functions shunt position add pin address 1-2 connected to vcc 0x54 not installed open 0x52 2-3* connected to gnd 0x50 *default position. table 4. jumper ju4 functions shunt position wdstart pin wd function 1-2 connected to vcc enabled 2-3* connected to gnd disabled *default position. table 5. jumper ju5 functions shunt position dacstart pin initial fan drive voltage 1-2* connected to vcc vfan not installed open 0.75 x vfan 2-3 connected to gnd 0v *default position. table 6. jumper ju6 functions shunt position spinstart pin initial spin-up behavior 1-2 connected to vcc full-scale drive voltage until two tachometer pulses, or 1s has elapsed not installed open full-scale drive voltage until two tachometer pulses, or 0.5s has elapsed 2-3* connected to gnd spin-up disabled *default position. table 2. jumper ju2 functions shunt position vcc pin 1-2 external 3.0v to 5.5v supply required 2-3* powered from cmaxqusb module *default position. downloaded from: http:///
evaluate: max6620 max6620 evaluation kit/evaluation system 8 _______________________________________________________________________________________ figure 4. max6620 ev kit schematic downloaded from: http:///
evaluate: max6620 max6620 evaluation kit/evaluation system _______________________________________________________________________________________ 9 figure 5. max6620 ev kit component placement guide?omponent side downloaded from: http:///
evaluate: max6620 max6620 evaluation kit/evaluation system 10 ______________________________________________________________________________________ figure 6. max6620 ev kit pcb layout?omponent side downloaded from: http:///
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 2008 maxim integrated products is a registered trademark of maxim integrated products, inc. evaluate: max6620 max6620 evaluation kit/evaluation system figure 7. max6620 ev kit pcb layout?older side downloaded from: http:///

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