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note: this is a summary document. the complete document is available under nda. for more information, please contact your local atmel sales office. features ? programmable avr ? 8-bit flash microcontroller transmitter ic frequency: 315 mhz (ata6285) and 433 mhz (ata6286) support ask/fsk modulation with integrated fsk switch 6 dbm output power with typically 8.5 ma active current consumption in transmission mode low-power microcontroller requires typically 0. 6 a sleep current wi th active interval timer interfaces for simple capacitive sensors (2 pf to 6 pf) one interface can be configured for motion wake-up (3 pf to 5 pf) typically 25 mbar adc resolution for press ure measurement with dedicated sensor type low-power measurement mode for directly connected capacitive sensors typically 200 a at 1 mhz system clock programmable 125 khz wake-up receiver chan nel with typically 1.7 a current consumption in listing mode 2v to 3.6v operation voltage for single li-cell power supply ?40c to +125c operation temperature and ?40c to +150c storage temperature less then 10 external passive components qfn32 (5 mm 5 mm) package 1. description ata6285 and ata6286 are highly integrated smart rf micro transmitter ics for 315 mhz and 433 mhz, suited for ask and fsk with typically 20 kbits/s data rate in manchester mode. the devices combine the functionality of the rf transmitter ics ata5756/ata5757 with the programmable low-power avr 8-bit flash microcontroller in a single qfn32 package (5 mm 5 mm). the ata6285 and ata6286 include a dedicated adc interface for simple capacitive sensors as well as an on-chip tempera- ture sensor. three sensor interfaces are available for a capacitive range of 2 pf to 16 pf, where one channel can be configured as motion wake-up in the range of 3 pf to 5 pf. the ics are suited for use in tire pressure monitoring (tpms) sensor gauges in combination with external sensor devices. the programmable avr 8-bit flash microcontroller includes 8 kbytes of in-system self-programmable flash me mory and an 320-bytes eepr om, thus allowing the sys- tem integrator to install field-programmable firmware to enable system flexibility on different platforms. ata6285 and ata6286 can be configured to guarantee extremely low power consumption in sleep mode and measurement mode. they also include a programmable 125 khz wake-up receiver channel for extremely low current consump- tion in listening mode. the ics are designed for use in applications with typically less then 10 passive components: one external crystal for the sensor gauge, several capacitors, a single limno2 battery coin cell, a single-ended antenna for the data transmission and an lf ferrite coil for the wake-up channel. ata6285 and ata6286 support tpms-specific low-current modes even with an active brown-out detection and an interval timer. tpms control and transmitter ic ata6285 ata6286 summary preliminary 4958as?auto?09/06
2 4958as?auto?09/06 ata6285/ata6286 [preliminary] 2. overview 2.1 application figure 2-1. tire pressure monitoring system (tpms) crystal frequency 13.56 mhz for 433 mhz application crystal frequency 13.125 mhz for 315 mhz application pressure sensor *) isp interface *) isp: flash interface in-system-programmable battery vdd rf loop antenna 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 16 15 14 13 ata6285/ ata6286 12 11 10 9 25 26 27 28 29 30 31 32 xz motion sensor
3 4958as?auto?09/06 ata6285/ata6286 [preliminary] 2.2 block diagram figure 2-2. ata6285/ata6286 block diagram (mcp) 2.3 inter-die bonding the ata6285/ata6286 are smart rf micro transmitter ics in mcp (multi chip package) tech- nology. table 2-1 shows the internal assembly of the mcp. vsrf pb7 (nss) vcc pb5 (sck) pb4 (miso) pb0 (t3icp) pb1 (t3o) pb6 pd0 (t2icp) pd1 (t3i) pd7 (sdin) nreset gndrf gnd pd2 (into) pb2 (t2i) sensor interface/ input multiplexer timer block oscillator avr core sram io ports debugwire flash eeprom ant2 ant1 xto2 xto1 lf1 pb3 (mosi) pc0 pc1 pc2 s2 s1 s0 lf2 vco rf transmitter power amplifier xto pll spi ecin1 clock power supervision por/ bod/ tsd and reset clock management and monitoring voltage monitor watchdog oscillator watchdog timer temperature sensor lf receiver 125 khz fsk ask table 2-1. inter-die connection description of the mcp avr ? pin ata5756/ata5757 ? pin pd3 (int1) ? external interrupt input 1 en ? enable input pd4 (ecin1) ? external clock input 1 clk ? clock output signal pd5 (t2o1) ? timer2 modulator output 1 ask ? input signal pd6 (t2o2) ? timer2 modulator output 2 fsk ? input signal
4 4958as?auto?09/06 ata6285/ata6286 [preliminary] 2.4 pin configuration figure 2-3. pinning qfn32 pb6 pb5 (sck) pb4 (miso) pb1 (t3o) ant2 ant1 xto2 pb7 (nss) lf1 lf2 vcc pc2 s2 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 16 pd0 (t2icp) pb0 (t3icp) gnd gnd pd2 (into) pb3 (mosi) pd7 (sdin) pd1 (t3i) s1 s0 nreset gnd pb2 (t2i) xto1 vsrf gnd gnd pc0 pc1 15 14 13 ata62857 ata6286 12 11 10 9 25 26 27 28 29 30 31 32 table 2-2. pin description pin number pin name alternate function 1 alternate function 2 function comment 1 pb4 miso pcint4 spi port b4 2 pb5 sck pcint5 spi port b5 3ant2? ? rf-antenna 2. emitter of antenna output stage rf pin 4ant1? ? rf-antenna 1. open collector antenna output rf pin 5 pb1 t3o pcint1 timer3 output port b1 6 pb6 ? pcint6 port b6 7 pb7 nss pcint7 spi port b7 8 xt02 ? ? switch for fsk modulation rf pin 9 pb2 t2i pcint2 timer2 external input clock port b2 10 xt01 ? ? connection for crystal rf pin 11 vs_rf ? ? power supply voltage for rf rf pin 12 gnd ? ? power supply ground for rf rf pin 13 nreset debugwire ? reset input/debugwire interface 14 gnd ? ? power supply ground 15 s0 ? ? sensor input 0 ? pressure sensor (cap.) 16 s1 ? ? sensor input 1 ? x ? motion sensor (cap.) 17 s2 ? ? sensor input 2 ? z - motion sensor (cap.) 18 gnd ? ? power supply ground note: 1. internal inter-die connection of the mcp
5 4958as?auto?09/06 ata6285/ata6286 [preliminary] 2.5 pin names 2.5.1 vcc supply voltage 2.5.2 gnd ground 2.5.3 port b (pb7..0) port b is a 5(8)-bit bi-directional i/o port with internal pull-up resistors (selected for each bit). the pb7, pb6 and pb2 ports are only used as internal i/o ports for inter-die connections. the port b output buffers have symmetrical drive characteristics with both high sink and source current capability. as inputs, port b pi ns that are externally pulled low will source current if the pull-up resistors are activated. the port b pins are tri-stated when a reset condition becomes active, even if the clock is not running. port b also serves the functions of various special features of the atmegat. 19 lf1 ? ? lf-receiver input 1 20 lf2 ? ? lf-receiver input 2 21 v cc ? ? power supply voltage (v cc + av cc ) 22 pc2 ? pcint10 - port c2 23 pc1 clko pcint9 system clock output port c1 24 pc0 ecin0 pcint8 external clock input 0 port c1 25 pd0 t2icp pcint16 timer2 external input capture port d0 26 pd1 t3i pcint17 timer3 external input clock port d1 27 pb0 t3icp pcint0 timer3 external input capture port b0 28 gnd ? ? power supply ground 29 gnd ? ? power supply ground inter-die (1) pd3 int1 pcint19 external interrupt 1 inter-die connection port d2 inter-die (1) pd4 ecin1 pcint20 external clock input 1 inter-die connection port d4 inter-die (1) pd5 t2o1 pcint21 timer2 modulator output 1 inter-die connection port d5 inter-die (1) pd6 t2o2 pcint22 timer2 modulator output 2 inter-die connection port d6 30 pd7 sdin pcint23 ssi ?serial data input port d7 31 pd2 int0 pcint18 external interrupt input 0 port d2 32 pb3 mosi pcint3 spi port b3 table 2-2. pin description (continued) pin number pin name alternate function 1 alternate function 2 function comment note: 1. internal inter-die connection of the mcp
6 4958as?auto?09/06 ata6285/ata6286 [preliminary] 2.5.4 port c (pc2..0) port c is a 3-bit bi-directional i/o port with inte rnal pull-up resistors (selected for each bit). the port c output buffers have symmetrical drive char acteristics with both high sink and source cur- rent capability. as inputs, port c pins that are externally pu lled low will source current if the pull-up resistors are activated. the port c pi ns are tri-stated when a reset condition becomes active, even if the clock is not running. 2.5.5 port d (pd7..0) port d is a 7(1)-bit bi-directional i/o port with internal pull-up resistors (selected for each bit). the pd(6..3) pins are used as internal inter-die connection i/o ports. the port d output buffers have symmetrical dr ive characteristics with both high sink and source current capability. as inputs, port d pins that are externally pulled low will source current if the pull-up resistors are activated. the port d pins are tri-stated when a reset condition becomes active, even if the clock is not running. port d also serves the functions of va rious special features of the atmegat. 2.5.6 nreset reset input. a low level on this pin for longer than the minimum pulse length will generate a reset, even if the clock is not running. shorte r pulses then defined minimum pulse length are not guaranteed to generate a reset. 2.5.7 lf (2..1) input coil pins for the lf-receiver. 2.5.8 s (2..0) measuring input pins for external capacitance sensor elements. 2.5.9 ant(2, 1) rf-antenna pins. 2.5.10 xto(0, 1) external crystal for the internal rf transmitter ic.
7 4958as?auto?09/06 ata6285/ata6286 [preliminary] 3. low power avr 8-bit microcontroller 3.1 features high performance, extremely low power avr 8-bit microcontroller advanced risc architecture ? 131 powerful instructions ?32 8 general purpose working registers ? fully static operation ? on-chip 2-cycle multiplier non-volatile program and data memories ? 8 kbytes of in-system self-programmable flash ? optional boot code section with independent lock bits ? 320 (256 + 64) bytes eeprom ? 512 bytes internal sram ? programming lock for software security peripheral features ? programmable watchdog/interval timer with se parate, internally calibrated and extremely low-power oscillator ? two 16-bit timer/counter wi th compare mode, capture mode , and on-chip digital data modulator circuitry ? integrated on-chip temperature sensor with thermal shutdown function ? sensor interface for ex ternal pressure sensor and xz- motion sensor ? highly sensitive 1d lf-receiver ? programmable voltage monitor ? system clock management and clock monitoring ? master/slave spi serial interface ? integrated debug-wire-interface ? interrupt and wake-up on pin change special microcontroller features ? power-on reset and programm able brown-out detection ? internal calibrated rc oscillator ? external and internal interrupt sources ? three sleep modes: idle, sensor noise reduction, and power-down i/o and package ? 15 programmable i/o lines 3.2 overview the embedded core is an extremely low-power cmos 8-bit microcontroller based on the avr enhanced risc architecture. by executing powerful instructions in a single clock cycle, the avr core achieves throughputs approaching 1 mips per mhz allowing the designer to optimize power consumption versus processing speed.
8 4958as?auto?09/06 ata6285/ata6286 [preliminary] 3.3 block diagram figure 3-1. microcontroller block diagram avr core gnd rese t vcc power supervision por/ bod/ tsd and reset clock management and monitoring watchdog oscillator watchdog timer 0 flash sram temperature sensor mux and sensor input voltage monitor 12 bit t1 16 bit t/ c3 lf receiver spi port d (x) port b (x) port c (x) 16 bit t/ c2 sensor value processing debugwire eeprom program logic oscillator circuit avcc agnd
9 4958as?auto?09/06 ata6285/ata6286 [preliminary] the avr core combines a rich instruction set with 32 general purpose working registers. all the 32 registers are directly connected to the arithmetic logic unit (alu), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. the resulting architecture is more code efficient while achiev ing throughputs up to ten times faster than con- ventional cisc microcontrollers. the embedded architecture provides the following features: 8k bytes of in-system programma- ble flash with read-while-write capabilities, 320 (256 + 64) bytes ee prom, 512 bytes sram, 11(19) general purpose i/o lines, 32 general purpose working registers, on-chip debugging support and programming, two flexible timer/counters with compare modes, internal and exter- nal interrupts, a sensor interface for external pressure sensor and acceleration/motion sensor, a programmable watchdog timer with internal cali brated oscillator, an spi serial port, and three software selectable power saving modes. the device is manufactured using atmel ? ?s high density non-volatile memory technology. the on-chip isp flash allows the program memory to be reprogrammed in-system through an spi serial interface, by a conventional non-volatile memory programmer, or by an on-chip boot pro- gram running on the avr core. the boot program can use any interface to download the application program in the applic ation flash memory. software in the boot flash section will continue to run while the application flash se ction is updated, providing true read-while-write operation. by combining an 8-bit risc cpu with in-system self-programmable flash on a monolithic chip, the atmel atmegat is a powerful microcontroller that provides a highly flexible and cost effective solution to many embedded control applications. the avr is supported with a full suite of program and system development tools including: c compilers, macro assemblers, program debugger/simulators, in-circuit emulators, and evalu- ation kits.
10 4958as?auto?09/06 ata6285/ata6286 [preliminary] 4. uhf ask/fsk transmitter for ata6285/ata6286 4.1 features pll transmitter ic with single-ended output high output power (6 dbm) at 8.1 ma (315 mhz) and 8.5 ma (433 mhz) typical values divide by 24 (ata6285) and 32 (ata6286) blocks for 13 mhz crystal frequencies and for low xto start-up times modulation scheme ask/fsk with internal fsk switch up to 20 kbits/s manc hester coding, up to 40 kbits/s nrz coding power-down idle and power-up modes to adjust corresponding current consumption through ask/fsk/enable input pins enable input for parallel usage of co ntrolling pins in a 3-wire bus system clk output switches on if the crystal current amplitude has reached 35% to 80% of its final value crystal oscillator time until clk ou tput is activated, typically 0.6 ms 4.2 benefits low parasitic fsk switch integrated very short and reproducible time to transmit typically < 0.85 ms 13.125 mhz/13.56 mhz crystals give opportunity for small package sizes 4.3 description the ata6285/ata6286 is a pll transmitter part which has been developed for the demands of rf low-cost transmission systems at data rates up to 20 kbits/s manchester coding and 40 kbits/s nrz coding. the transmitting frequency range is 313 mhz to 317 mhz (ata6285) and 432 mhz to 448 mhz (ata6286), respectively. it can be used in both fsk and ask sys- tems. due to its shorten crystal oscillator sett ling time it is well suited for tire pressure monitoring (tpms) and for passive entry go applications. figure 4-1. system block diagram power amp. (lna, mixer, vco, pll, if filter, rssi amp., demodulator) micro- controller interface micro- controller digital control logic power supply rf receiver pll uhf ask/fsk receiver uhf ask/fsk tpm transmitter part of ata6285/ata6286 vco xto antenna 4 to 8 encoder atarx9x vco 1 li cell keys antenna
11 4958as?auto?09/06 ata6285/ata6286 [preliminary] 4.4 general description this fully integrated pll transmitte r allows the design of simple, low-cost rf miniature transmit- ters for tpm and rke applications. the vco is locked to 24 f xtal /32 x f xtal for ata6285/ata6286. thus, a 13.125 mhz/13.56 mhz crystal is needed for a 315 mhz/ 433.92 mhz transmitter. all other pll and vco peripheral elements are integrated. the xto is a series resonance (c urrent mode) oscillator. only one capacitor and a crystal con- nected in series to gnd are needed as external elements in an ask system. the internal fsk switch, together with a second capacitor, can be used for fsk modulation. the crystal oscillator needs typically 0.6 ms until the clk output is activated if a crystal as defined in the electrical characteristics is used (e.g., tpm crystal). for most crystals used in rke systems, a shorter time will result. the clk output is switched on if the amplitude of the current flowing through the crystal has reached 35% to 80% of its final value. this is synchronized with the 1.64 mhz/1.69 mhz clk output. as a result, the first period of the clk output is always a full period. the pll is then locked < 250 s after clk output activation. this means an additional wait time of 250 s is necessary before the pa can be switched on and the data transmission can start. this results in a significantly lower time of about 0.85 ms between enabling the ata6285/ata6286 and the beginning of the data transmission which saves batte ry power especially in tire pressure moni- toring systems. the power amplifier is an open-collector output delivering a current pulse which is nearly inde- pendent from the load impedance and therefore the output power can be controlled via the connected load impedance. this output configuration enables a simple matching to any kind of antenna or to 50 ? . a high power efficiency for the power amplifier results if an optimized load impedance of z load, opt =380 ? + j340 ? (ata6285) at 315 mhz and z load, opt = 280 ? + j310 ? (ata6286) at 433.92 mhz is used at the 3v supply voltage. 4.5 functional description if ask = low, fsk = low and enable = open or low, the circuit is in power-down mode con- suming only a very small amount of current so that a lithium cell used as power supply can work for many years. if the enable pin is left open, enable is the logical or operation of the ask and fsk input pins. this means, the ic can be switched on by either the fsk of the ask input. if the enable pin is low and ask or fsk are high, the ic is in idle mode where the pll, xto and power amplifier are off and the microcon troller ports controlling the ask and fsk inputs can be used to control other devices. this can help to save ports on the microcontroller in systems where other devices with 3-wire interface are used. with fsk = high and ask = low and enable = open or high, the pll and the xto are switched on and the power amplifier is off. when the amplitude of the current through the crystal has reached 35% to 80% of its final amplitude, the clk driver is automatically activated. the clk output stays low until the clk driver has been activated. the driver is activated synchro- nously with the clk output frequency, hence, the first pulse on the clk output is a complete period. the pll is then locked within < 250 s after the clk driver has been activated, and the transmitter is then ready for data transmission.
12 4958as?auto?09/06 ata6285/ata6286 [preliminary] with ask = high the power amplifier is switched on. this is used to perform the ask modula- tion. during ask modulation the ic is en abled with the fsk or the enable pin. with fsk = low the switch at pin xto2 is cl osed, with fsk = high the switch is open. to achieve a faster start-up of the crystal oscillator, the fsk pin should be high during start-up of the xto because the series resistance of the resonator seen from pin xto1 is lower if the switch is off. the different modes of the ata6285/ata6286 are listed in table 4-1 . 4.5.1 transmission with enable = open 4.5.1.1 ask mode the ata6285/ata6286 is acti vated by enable = open, fsk = high, ask = low. the micro- controller is then switched to external clocking. after typically 0.6 ms, the clk driver is activated automatically (i.e., the microcontroller waits until the xto and clk are ready). after another time period of 250 s, the pll is locked and ready to transmit. the output power can then be modulated by means of pin ask. after transmission, ask is switch ed to low and the microcon- troller returns back to internal clocking. then, the ata6285/ata6286 is switched to power-down mode with fsk = low. figure 4-2. timing ask mode with enable open table 4-1. transmitter part ask pin fsk pin enable pin mode low low low/open power-down mode, fsk switch high z low low high power-up, pa off, fsk switch low z low high high/open power-up, pa off, fsk switch high z high low high/open power-up, pa on, fsk switch low z high high high/open power-up, pa on, fsk switch high z low/high high low idle mode, fsk switch high z high low/high low idle mode, fsk switch high z power-down power-down power-up, pa off power-up, pa o n (high) power-up, pa off (low) fsk ask clk ? t xto > 250 s
13 4958as?auto?09/06 ata6285/ata6286 [preliminary] 4.5.1.2 fsk mode the ata6285/ata6286 is activated by fsk = high, ask = low. the microcontroller is then switched to external clocking. after typically 0. 6 ms, the clk driver is activated automatically (i.e., the microcontroller waits until the xto and clk are ready. after another time period of 250 s, the pll is locked and ready to transmit. the power amplifier is switched on with ask = h. the ata6285/ata6286 is then ready fo r fsk modulation. the microcontroller starts to switch on and off the capacitor between the crystal load capacitor and gnd by means of pin fsk, thus, changing the reference frequency of the pll. if fsk = l the output frequency is lower, if fsk = h output frequency is higher. after transmission, fsk stays high and ask is switched to low and the microcontroller retu rns back to internal clocking. then, the ata6285/ata6286 is switched to power-down mode with fsk = low. figure 4-3. timing fsk mode with enable open 4.5.2 transmission with enable = high 4.5.2.1 fsk mode the ata6285/ata6286 is activated by enable = high, fsk = high and ask = low. the microcontroller is then switched to external clocking . after typically 0.6 ms, the clk driver is acti- vated automatically (i.e., the microcontroller waits until the xto and clk are ready). after another time period of 250 s, the pll is locked and ready to transmit. the power amplifier is switched on with ask = h. t he ata6285/ata6286 is then read y for fsk modulation. the microcontroller starts to switch on and off the capacitor between the crystal load capacitor and gnd by means of pin fsk, thus, changing the reference frequency of the pll. if fsk = l the output frequency is lower, if fsk = h output fr equency is higher. after transmission, ask is switched to low and the microcontroller retu rns back to internal clocking. then, the ata6285/ata6286 is switched to power-down mode with enable = low and fsk = low. power-down power-down power-up, pa off power-up, pa o n (f rf = high) power-up, pa off (f rf = low) fsk ask clk ? t xto > 250 s
14 4958as?auto?09/06 ata6285/ata6286 [preliminary] figure 4-4. timing fsk mode with enable co nnected to the microcontroller 4.5.2.2 ask mode the ata6285/ata6286 is activated by enable = high, fsk = high and ask = low. after acti- vation the microcontroller is switched to external clocking. after typically 0.6 ms, the clk driver is activated automatically (the microcontroller waits until the xto and clk are ready). after another time period of 250 s, the pll is locked and ready to transmit. the output power can then be modulated by means of pin ask. after transmission, ask is switched to low and the microcontroller returns back to internal cloc king. then, the ata6285/ata6286 is switched to power-down mode with enable = low and fsk = low. figure 4-5. timing ask mode with enable con nected to the microcontroller power-down power-down power-up, pa off power-up, pa on (f rf = high) power-up, pa off (f rf = low) fsk enable ask clk ? t xto > 250 s power-down power-down power-up, pa off power-up, pa o n (high) power-up, pa off (low) fsk enable ask clk ? t xto > 250 s
15 4958as?auto?09/06 ata6285/ata6286 [preliminary] 4.5.3 accuracy of frequency deviation the accuracy of the frequ ency deviation using the xtal pulling method is about 20% if the fol- lowing tolerances are considered. one impor tant aspect is that the values of c 0 and c m of typical crystals are strongly correlated which reduces the tolerance of the frequency deviation. figure 4-6. tolerances of frequency modulation using a crystal with a motional capacitance of c m = 4.37 ff 15%, a nominal load capacitance of cl nom = 18 pf and a parallel capacitance of c 0 = 1.30 pf correlated with c m results in c 0 =297 c m (the correlation has a tolerance of 10%, so c 0 = 267 to 326 c m ). if using the internal fsk switch with c switch = 0.9 pf 20% and estimated parasitics of c stray = 0.7 pf 10%, the resulting c 4 and c 5 values are c 4 = 10 pf 1% and c 5 = 15 pf 1% for a nominal frequency deviation of 19.3 khz with worst case tolerances of 15.8 khz to 23.2 khz. 4.5.4 accuracy of the center frequency the imaginary part of the impedance in large sig nal steady state oscillation im xto , seen into the pin 7 (xto1), causes some additi onal frequency tolera nces, due to pulling of the xto oscillation frequency. these tolerances have to be added to the tolerances of the crystal itself (adjustment tolerance, temperat ure stability and ageing) and the influenc e to the center frequency due to tol- erances of c 4 , c 5 , c switch and c stray . the nominal value of im xto = 110 ? , c switch and c stray should be absorbed into the c 4 and c 5 values by using a crystal with known frequency and choosing c 4 and c 5 , so that the xto center frequency equals the crystal frequency, and the fre- quency deviation is as expected. then, from the nominal value, the im xto has 90 ? tolerances, using the pulling formula p = ?im xto c m pi f xto with f xto = 13.56 mhz and c m = 4.4 ff an additional frequency tolerance of p = 16.86 ppm results. if using crystals with other c m the additional frequency tolerance can be calculated in the same way. for example, a lower c m = 3.1 ff will reduce the frequency tolerance to 11.87 ppm, where a higher c m = 5.5 ff increases the tolerance to 21.07 ppm. 4.5.5 clk output an output clk signal of 1.64 mhz (ata6285 operating at 315 mhz) and 1.69 mhz (ata6286 operating at 433.92 mhz) is provided for a connected microcontroller. the delivered signal is cmos-compatible with a high and low time of >125 ns if the load capacitance is lower than 20 pf. the clk output is low in power-down mode due to an internal pull-down resistor. after enabling the pll and xto the signal stays low until the amplitude of the crystal oscillator has reached 35% to 80% of its amplitude. then, the clk output is activated synchronously with its output signal so that the first period of the clk output signal is a full period. r s l m c 4 c m v s xtal c 0 c 5 c switch crystal equivalent circuit c stray
16 4958as?auto?09/06 ata6285/ata6286 [preliminary] 4.5.5.1 clock pulse take-over by microcontroller the clock of the crystal oscillator can be used for clocking the microcontroller. atmel?s atarx9x microcontroller family pr ovides the special feature of starting with an integrated rc oscillator to switch on the ata6285/ata6286 external clocking and to wait automatically until the clk out- put of the ata6285/ata6286 is activated. after a time period of 250 s the message can be sent with crystal accuracy. 4.5.6 output matching and power setting the output power is set by the load impedance of the antenna. the maximum output power is achieved with a load impedance of z load, opt = 380 ? + j340 ? (ata6286) at 315 mhz and z load, opt =280 ? + j310 ? (ata6285) at 433.92 mhz. a low resistive path to v s is required to deliver the dc current. the power amplifier delivers a current pulse and the maximum output power is delivered to a resistive load if the 0.66 pf output capacitanc e of the power amplifier is compensated by the load impedance. at the ant1 pin, the rf output amplitude is about v s ? 0.5v. the load impedance is defined as the impedance seen from the ata6285?s ant1, ant2 into the matching network. do not mix up this lar ge-signal load impedance with a small-signal input impedance delivered as an input characteristic of rf amplifiers. the latter is measured from the application into the ic instead of from the ic into the application for a power amplifier. the 0.66 pf output capacitance absorbed into the load impedance a real impedance of 684 ? (ata6285) at 315 mhz and 623 ? (ata6286) at 433.92 mhz should be measured with a network analyses at pin 5 (ant1) with the ata6285/ata6286 soldered, an optimized antenna con- nected and the power amplifier switched off. less output power is achieved by lowering the real parallel part where the parallel imaginary part should be kept constant. lowering the real par t of the load impedance also reduces the supply voltage dependency of the output power. output power measurement can be done with the circuit as shown in output power measure- ment. please note that the component values must be changed to compensate the individual board parasitics until the ata6285/ata6286 has the right load impedance. also, the damping of the cable used to measure the output power must be calibrated. figure 4-7. output power measurement ata6285/ata6286 l 1 = 68 nh/ 39 nh c 2 = 2.2 pf/ 1.8 pf c 1 = 1 nf v s r in ant2 ant1 z lopt power meter 50 ? z = 50 ?
17 4958as?auto?09/06 ata6285/ata6286 [preliminary] 6. package information 5. ordering information extended type number package frequency moq remarks ATA6285-PNPW qfn32 315 mhz packaging unit: 1,500 taped and reeled ata6286-pnpw qfn32 433 mhz packaging unit: 1,500 taped and reeled ata6285-pnqw qfn32 315 mhz 6,000 taped and reeled ata6286-pnqw qfn32 433 mhz 6,000 taped and reeled 0.9 0.1 0.23 0.07 0.4 0.1 3.6 0.15 0.2 z 10:1 z 3.5 0.5 nom. 32 16 9 25 32 top bottom pin1 identification 24 17 1 8 1 5 17 specifications according to din technical drawings issue: 1; 28.11.05 drawing-no.: 6.543-5124.01-4 not indicated tolerances 0.05 dimensions in mm package: qfn_ 5 x 5_32l exposed pad 3.6 x 3.6
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