View ATA6842-PLQW_1529998.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

features ? driver stages ? four dmos 150ma low-side relay drivers with current limitation ? one gate driver for external n-channel fet with charge pump and bootstrap ? two universal outputs (10ma high side and 60ma low side) ? one 20ma warning lamp driver ? power supplies ? 5v/150ma linear regulator ? 5v/30ma linear regulator (als o active in standby mode) ? internal power supply ? switchable system su pply voltage output ? monitoring and protection ? 12v monitoring ? watchdog with reset ? two comparators for current measurement ? adjustable undervoltage warning level ? overtemperature protection with hysteresis ? two 5v comparators ? wide supply voltage range from 5.8v up to 26v ? 8-bit spi interface ? low current consumption in standby mode 80a ? ttl and cmos compatible inputs ? 2kv esd protection ? transient protection according to is o/tr 7637-1 level 4 (except load dump) applications as an automotive failsafe system ic, the atmel ? ata6842 is ideal for driver and monitoring functions in ambitious solutions with increased safety requests such as parking brakes, power steering, and other applications with dc motor control. automotive failsafe system ic atmel ata6842 4964c?auto?11/10
2 4964c?auto?11/10 atmel ata6842 1. description the atmel ? ata6842 is a monolithically-integrated multi-functional ic designed in atmel?s state-of-the-art 0.8m bcdmos technology. with its built-in driver stages, voltage supplies and monitoring functions, it is an ideal cost saving failsafe system ic. the communication with an external microcontroller is provided by an 8-bit spi interface. four protected and current limited driver stages are available to control relays and additionally there is a gate driver including charge pump and bootstrap to control an external fet. three leds for status information can be controlled via three separate outputs: the high-side driver at pin outp has monitoring functions for overcurrent and current threshold. the low-side drivers at the pins wln and outn also have monitoring functions for overcurrent, current threshold, and voltage monitoring. two internal bandgap references control and monitor two independent 5v supply voltages. in standby mode the internal ic-supply is provided by one of them; the other one is switched off, in order to reduce the power consumption to a minimum. all internal blocks are supplied by a specific internal voltage regulator. the system supply voltage and all internally-generated voltages are monitored and in case of over or undervoltage all drivers are switched off. via the spi the system supply voltage can be switched to provide power for external components. the car battery voltage (kl 30) is monitored by an adjustable monitoring function. an oscillator with an external rc circuitry and a fully-integrated auxiliary oscillator which can be set via the pin rref are the clock references for the watchdog and all other time con- stants. both oscillato rs monitor each other. the independent watchdog circuitry monitors the microcontroller?s correct operation. two differential amplifiers support the us e of external a/d converters for current measurement. two comparators are provided to monitor the 5v supply of external devices like sensors. the atmel ata6842 is the improved version and successor of the atmel ata6814. pin and function compatible to it, the atmel ata6842 is the replacement in all applications. the atmel ata6842 offers a flawless performance in reference to the requests of some automotive cus- tomers regarding very slow supply voltage ramps ups and downs.
3 4964c?auto?11/10 atmel ata6842 figure 1-1. block diagram v12s ctrl control logic 8-bit spi 12v switch ctrl wlp uvm wln rref gnd l a p test outn outp c2i c2o bsc tcfet rd1 rd4 rd3 rd2 ctrl enable test 12v over/ undervoltage monitor battery undervoltage monitor universal lowside driver ctrl ctrl ctrl b2ci b2cg b2co auxiliary 5v voltage regulator main 5v voltage regulator bandgap reference bandgap reference internal voltage regulator fully integrated main oscillator overtemperature monitor watchdog oscillator current bias for all blocks watchdog with reset function universal lowside driver universal highside driver highside gate driver with charge pump lowside driver lowside driver lowside driver ctrl lowside driver voltage monitoring current measurement comparator current measurement comparator voltage monitoring comparator 1 voltage monitoring comparator 2 ctrl ctrl (ctrl) ctrl ctrl ctrl ctrl ctrl ctrl ctrl ctrl ctrl ctrl ctrl i ref b1ci b1cg b1co v12 do vre ek15 e5 b5 v5 b5a rcos v5a resan resn wdt rstn vi clk di csn erd uvr uvw c1i c1o
4 4964c?auto?11/10 atmel ata6842 figure 1-2. application circuit p vi wln 10 f 47 f p p erd c1i c2i c2o c1o do p p p p p p p p p p p p p 100 nf cv5 ck30 dk30 qu5 std1802 4.7 f cv5a qu5a bc817-40 100 nf dwln cvi 47 nf cbs1 rref ek15 rstn resan csn di clk resn wdt e5 gnda gndl b1co rwln 2.7 k ruvm 510 10 k rref 100 k ruv2 2.5 k ruv1 1 k 47 nf cbs2 doutn dk15 rtc2 10 k rtc1 10 k routn 2.7 k outp test vre gndp v12s vi wln tcfet bsc v5a b5a v5 b5 wlp outn k15ext k15 k30 k30p k30 doutp routp 2.7 k v12 vi uvr rcos uvm uvw b1cg b1ci rd2 1 k rl12 1 k rl14 adc adc 20 k rl15 0.01 rl13 20 k rl11 mr34 mr12 m1 8.2 rl1 rl2 rl1 mtcfet1 rd1 k30p m b2co b2cg b2ci rd4 1 k rl22 1 k rl24 20 k rl25 0.01 rl23 20 k rl21 8.2 rl2 mtcfet2 cos ros 1 nf m2 rl4 rl3 rd3 k30p m
5 4964c?auto?11/10 atmel ata6842 2. pin configuration figure 2-1. pinning qfn48 c1i rd2 rd1 v12 s wln outp v12 rd4 gndp rd 3 c2i outn atmel ata6 8 42 clk c s n rco s e5 ek15 uvm te s t uvr gnda rref re s n r s tn di do vre c10 gndl c20 b1co b2co b2ci b2cg b1cg b1ci vi b5 v5a b5a wdt uvw re s an wlp erd v5 b s c tcfet 24 2 3 22 21 20 19 1 8 17 16 15 14 1 3 3 7 38 3 9 40 41 42 4 3 44 45 46 47 4 8 25 26 27 2 8 29 3 0 3 1 3 2 33 3 4 3 5 3 6 12 11 10 9 8 7 6 5 4 3 2 1 table 2-1. pin description pin symbol function 1 rstn reset input 2 resn reset output 3 rref reference resistor 4 gnda analog ground 5 uvr undervoltage reference input 6 test test 7 uvm undervoltage measurement input 8 ek15 enable (k15 based) 9 e5 enable (5v based) 10 rcos resistor-capacitor oscillator 11 csn chip-select input 12 clk clock input 13 di data input 14 do data output 15 vre external voltage regulator output 16 c1o comparator 1 output 17 gndl logic ground 18 c2o comparator 2 output 19 b1co bridge 1 current output 20 b1ci bridge 1 current input 21 b1cg bridge 1 current ground
6 4964c?auto?11/10 atmel ata6842 22 b2co bridge 2 current output 23 b2ci bridge 2 current input 24 b2cg bridge 2 current ground 25 c2i comparator 2 input 26 outn low-side driver output 27 c1i comparator 1 input 28 rd4 relay driver 4 output 29 rd3 relay driver 3 output 30 gndp power ground 31 rd2 relay driver 2 output 32 rd1 relay driver 1 output 33 v12s 12v switch 34 v12 12v supply voltage 35 outp high-side driver output 36 wln warning lamp output 37 tcfet test current fet 38 bsc bootstrap capacitor 39 vi internal 5v supply 40 v5 5v supply 41 b5 base 5v supply 42 v5a auxiliary 5v supply 43 b5a base auxiliary 5v supply 44 erd enable relay driver input 45 wlp warning lamp polarity input 46 wdt watchdog trigger input 47 uvw undervoltage warning output 48 resan auxiliary reset output table 2-1. pin description (continued) pin symbol function
7 4964c?auto?11/10 atmel ata6842 3. absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng conditions for extended periods may affect device reliability . parameters condition symbol min. max. unit supply voltage v12 ?0.3 +26 v supply voltage t < 500ms v12 ?0.3 +45 v voltage at pins clk, di, e5, erd, wdt, wlp, csn, rstn, vre, do, c1o, c2o, resn, resan, uvr, uvw, rref, vi, test, b1ci, b1cg, b1co, b2ci, b2cg, b2co, rcos v() v5 + 0.3v v() ?0.3 +5.5 v current in pins clk, di, e5, erd, wdt, wlp, csn, rstn, vre, do, c1o, c2o, resn, resan, uvr, uvw, rref, vi, test, b1ci, b1cg, b1co, b2ci, b2cg, b2co, rcos i() ?10 +10 ma voltage at rd1, rd2, rd3, rd4, wln, outn, outp, ek15, bsc, tcfet, uvm v() ?0.3 +45 v current in rd1, rd2, rd3, rd4, wln, outn i() ?150 +150 ma current in outp i() ?10 +10 ma voltage at v5, v5a v() ?0.3 +5.5 v current in v5 i() ?150 +10 ma current in v5a i() ?50 +10 ma voltage at v12s v() ?0.3 +45 v current in v12s i() ?60 +10 ma esd protection at all pins mil-std-883, method 3015, hbm 100pf discharged through 1.5k vd() 2 kv junction temperature operation t j,op ?40 +150 c peak t j,peak ?40 +165 c storage temperature t s ?55 +125 c 4. thermal resistance parameters condition symbol min. max. unit operating ambient temperature range t amb ?40 +105 c thermal resistance, chip to case r thjc 10 k/w soldering temperature t ms 260 c
8 4964c?auto?11/10 atmel ata6842 5. electrical characteristics operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* 1 total device 1.1 permissible supply voltage all functions reduced operation mode (1) v12 6.5 5.8 26 6.5 v v a 1.2 supply current v12 i(v12) 10 ma a 1.3 supply current standby, v12 = 14v, i(v5a) = ?10a v12 i(v12) 80 a a 1.4 leakage current low v() = 0v to v12, v12 = 14v wln, outn, rd1 to rd4 ilk()lo,stb ?1 +1 a a 1.5 leakage current high v() = 0v to v12, v12 = 14v v(bsc) = 14v outp, v12s, bsc ilk()hi,stb ?1 +1 a a 1.6 supply current all v5 based i/o pins open v5 i(v5) 0.5 ma a 1.7 supply current resan open v5a i(v5a) 50 a a 1.8 pull-up current to v5 v() = 0.7 v5 csn ipu() ?100 ?10 a a 1.9 pull-up current to vi v() = 0.7 vi rstn ipu() ?100 ?10 a a 1.10 pull-up current to v5 v() = 0v csn ipu() ?200 ?20 a a 1.11 pull-up current to vi v() = 0v rstn ipu() ?200 ?20 a a 1.12 pull-down current v() = 0.2 v5 clk, di, e5, erd, wdt ipd() 10 100 a a 1.13 pull-down current v() = 0.2 vi wlp ipd() 10 100 a a 1.14 pull-down current v() = v5 clk, di, e5, erd, wdt ipd() 20 200 a a 1.15 pull-down current v() = vi wlp ipd() 20 200 a a 1.16 pull-up voltage to v5 vpu() = v() ? v5, i() = ?10a csn vpu() ?0.6 v a 1.17 pull-up voltage to vi vpu() = v() ? vi, i() = ?10a rstn vpu() ?0.6 v a 1.18 pull-down voltage i() = 10a clk, di, e5, erd, wdt, wlp vpd() 0.6 v a 1.19 input threshold voltage high clk, csn, di, e5, erd, rstn, wdt, wlp vt()hi 2 v a 1.20 input threshold voltage low clk, csn, di, e5, erd, rstn, wdt, wlp vt()lo 0.85 v a 1.21 input hysteresis voltage vt()hys = vt()hi ? vt()lo clk, csn, di, e5, erd, rstn, wdt, wlp vt()hys 0.2 1 v a 1.22 saturation voltage low i() = 0.1ma, outputs low c1o, c2o, vre, do, resan, resn, uvw vs()lo 0.2 v a *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits
9 4964c?auto?11/10 atmel ata6842 1.23 saturation voltage low i() = 1.6ma, outputs low c1o, c2o, vre, do, resan, resn, uvw vs()lo 0.4 v a 1.24 saturation voltage high vs() = v5 ? v(), i() = ?0.1ma, outputs high c1o, c2o, do, resn, uvw vs()hi 0.5 v a 1.25 saturation voltage high vs() = v5a ? v(), i() = ?0.1ma, resan high resan vs()hi 0.5 v a 1.26 saturation voltage high vs() = v5 ? v(), i() = ?1.6ma, outputs high c1o, c2o, do, resn, uvw vs()hi 1 v a 1.27 saturation voltage high vs() = v5a ? v(), i() = ?1.6ma, resan high resan vs()hi 1 v a 1.28 rise time c load = 10 pf, v() from low = 10% -> high = 90% v5 c1o, c2o, do, resn, uvw tr() 200 ns b 1.29 rise time c load = 10 pf, v() from low = 10% -> high = 90% v5a resan tr() 200 ns b 1.30 fall time c load = 10 pf, v() from high = 90% -> low = 10% v5 c1o, c2o, do, resn, uvw tf() 200 ns b 1.31 fall time c load = 10 pf, v() from high = 90% -> low = 10% v5a resan tf() 200 ns b 1.32 leakage current do = off, v() = 0v to v5 do i()lk ?10 +10 a a 1.33 short circuit current low v() = v5, pins = low c1o, c2o, do, resn, uvw isc()lo 8 40 ma a 1.34 short circuit current low v() = v5a, resan = low resan isc()lo 8 40 ma a 1.35 short circuit current high v() = 0v, pins = high c1o, c2o, vre, do, resan, resn, uvw isc()hi ?30 ?8 ma a 1.36 saturation voltage high vs() = vi ? v(), i() = ?0.1ma, vre high vre vs()hi 0.5 v a 1.37 saturation voltage high vs() = vi ? v(), i() = ?1.6ma, vre high vre vs()hi 1 v a 1.38 short circuit current low v() = vi, vre = low vre isc()lo 8 40 ma a 1.39 rise time c load = 10pf, v() from low = 10% -> high = 90% vi vre tr() 200 ns b 1.40 fall time c load = 10pf, v() from high = 90% -> low = 10% vi vre tf() 200 ns b 5. electrical characteristics (continued) operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits
10 4964c?auto?11/10 atmel ata6842 2 bandgap, bias 2.1 voltage at rref rref = 10k 2% rref v(rref) 1.18 1.23 1.28 v a 3 temperature monitoring 3.1 thermal shutdown temperature overcurrent in wln, outn or outp for t > 200s t1 off 120 145 c a 3.2 thermal re-entry temperature overcurrent in wln, outn or outp for t > 200s t1 on 105 135 c a 3.3 thermal hysteresis 1 t1 hys = t1 off ? t1 on t1 hys 520ca 3.4 thermal shutdown temperature t2 off 140 165 c a 3.5 thermal re-entry temperature t2 on 125 155 c a 3.6 thermal hysteresis 2 t2 hys = t2 off ? t2 on t2 hys 51220ca 4 enable/standby 4.1 input resistor ek15 riek15 60 100 150 k a 4.2 upper enable threshold ek15 vek15 on 2.5 v a 4.3 lower enable threshold ek15 vek15 off 1.5 v a 4.4 enable hysteresis ek15 vek15 hys 200 600 mv a 4.5 enable time based on watchdog oscillator period ek15 te(ek15) 1 6 a 5 v12 voltage monitoring 5.1 lower undervoltage threshold v12 vtu lo 4.8 v a 5.2 upper undervoltage threshold v12 vtu hi 5.8 v a 5.3 undervoltage hysteresis vtu hys = vtu hi ? vtu lo v12 vtu hys 200 600 mv a 5.4 lower overvoltage threshold v12 vto lo 26 v a 5.5 upper overvoltage threshold v12 vto hi 32 v a 5.6 overvoltage hysteresis vto hys = vto hi ? vto lo v12 vto hys 0.5 1.8 v a 5.7 under/overvoltage filter time v12 tfi 50 100 s a 5. electrical characteristics (continued) operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits
11 4964c?auto?11/10 atmel ata6842 6 linear regulator 6.1 output voltage i(v5) = ?150ma to 0ma, ?(npn) > 120ma, uce,sat(npn) < 0.8v, f t > 100mhz u be (npn) < 0.8v at ?40c, u be (npn) < 0.7v at 27c, u be (npn) < 0.6v at 105c v5 v5 4.85 5 5.15 v a 6.2 line regulation v12 = 8v to 18v, i(v5) = ?150ma v5 v5 lir ?10 +10 mv a 6.3 load regulation v12 = 14v, i(v5) = ?50ma to ?150ma v5 v5 lor ?20 +20 mv a 6.4 allowed capacitor v5 cv5 7 22 f c 6.5 allowed capacitor v5 esr,cv5 0.5 10 c 6.6 lower threshold undervoltage resn = low v5 vtu(v5)low 4.5 v a 6.7 upper threshold undervoltage resn = high v5 vtu(v5)hig h 4.8 v a 6.8 lower threshold overvoltage resn = high v5 vto(v5)low 5.2 v a 6.9 upper threshold overvoltage resn = low v5 vto(v5)hig h 5.5 v a 6.10 hysteresis under/overvoltage v5 vt(v5)hys 50 200 mv a 6.11 under/overvoltage filter time v5 tfi(v5) 8 30 s a 6.12 short circuit current v(b5) = 0v b5 isc(b5) 1.5 8 ma a 6.13 pull-down resistor v(b5) = 1v b5 rpd(b5) 50 250 k a 6.14 pull-down current v(b5) = 6v b5 ipd(b5) 10 50 a a 6.15 saturation voltage high vs(b5) = v12 ? v(b5), v12 = 5.8v to 6.5v, i(b5) = ?1.25ma t j = ?40c t j = 27c t j = 105c b5 vs(b5)high 0.15 0.25 0.35 v v v a 5. electrical characteristics (continued) operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits
12 4964c?auto?11/10 atmel ata6842 7 v5a auxiliary linear regulator 7.1 output voltage i(v5a) = ?30ma to 0ma, ?(npn) > 200, uce,sat(npn) < 1v, u be (npn) < 0.8v at ?40c, u be (npn) < 0.7v at 27c, u be (npn) < 0.6v at 105c v5a v5a 4.65 5 5.35 v a 7.2 line regulation v12 = 8v to 18v, i(v5a) = ?30ma v5a v5a lir ?10 +10 mv a 7.3 load regulation v12 = 14v, i(v5a) = ?10ma to ?30ma v5a v5a lor ?20 +20 mv a 7.4 minimum capacitor v5a cv5a 3.3 10 f c 7.5 minimum capacitor v5a esr,v5a 0.5 10 c 7.6 lower threshold undervoltage resan = low v5a vtu(v5a) low 4va 7.7 upper threshold undervoltage resan = high v5a vtu(v5a) high 4.6 v a 7.8 lower threshold overvoltage resan = high v5a vto(v5a) low 5.4 v a 7.9 upper threshold overvoltage resan = low v5a vto(v5a) high 6va 7.10 hysteresis under/ overvoltage v5a vt(v5a) hys 50 200 mv a 7.11 under/overvoltage filter time not in standby mode v5a tfi(v5a) 8 30 s a 7.12 short circuit current v(b5a) = 0v b5a isc(b5a) 0.3 1.5 ma a 7.13 pull-down resistor v(b5a) = 1v b5a rpd(b5a) 50 250 k a 7.14 pull-down current v(b5a) = 6v b5a ipd(b5a) 10 50 a a 7.15 saturation voltage high vs(b5a) = v12 ? v(b5a), v12 = 5.8v to 6.5v, i(b5a) = ?150a t j = ?40c t j = 27c t j = 105c b5a vs(b5a) hi 0.35 0.45 0.55 v v v a 5. electrical characteristics (continued) operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits
13 4964c?auto?11/10 atmel ata6842 8 internal voltage supply vi 8.1 output voltage c(vi) = 100nf, i(vi) = ?1ma to 0ma vi vi 4.35 5.35 v a 8.2 lower threshold undervoltage resn = low vi vtu lo 3va 8.3 upper threshold undervoltage resn = high vi vtu hi 4.3 v a 8.4 lower threshold overvoltage resn = high vi vto lo 5.4 v a 8.5 upper threshold overvoltage resn = low vi vto hi 6va 8.6 hysteresis undervoltage vi vtu hys 0.4 1 v a 8.7 hysteresis overvoltage vi vto hys 50 200 mv a 8.8 short-circuit current vi = 0v vi isc() 20 150 ma a 9 current measurement, x = 1, 2 9.1 output voltage low i(bxco) = 20a, bxco = low bxco vs()lo ?10 +30 mv a 9.2 saturation voltage i(bxco) = ?750a, bxco = high, vs(bxco)hi = v5?v(bxco) bxco vs()hi 100 mv a 9.3 short-circuit current low bxco = low, v(bxco) = v5 bxco isc()lo 0.5 2 ma a 9.4 short-circuit current high bxco = high, v(bxco) = 0v bxco isc()hi ?25 ?2.5 ma a 9.5 input offset voltage v(bxco) ? (v(bxci) ? v(bxcg)) vos() = v(bxci) ? v(bxcg) t j = ?40c t j = 27c t j = 105c bxco vos() ?3.5 ?3 ?3.5 +3.5 +3 +3.5 mv mv mv a 9.6 leakage current v(bxci), v(bxcg) = ?0.7v to +0.35v bxci bxcg ilk() ?1.75 ?1 ?0.25 a a 9.7 input voltage range bxci bxco vi() ?0.7 +0.35 v a 9.8 difference in leakage current v(bxci), v(bxcg) = ?0.7v to +0.35v, dilk(bxci, bxcg), b1ci, b1cg and b2ci, b2cg dilk() ?0.25 +0.25 a a 5. electrical characteristics (continued) operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits
14 4964c?auto?11/10 atmel ata6842 10 relay driver rdx, x = 1 to 4 10.1 saturation voltage low i(rdx) = 150ma, t < t off t j = ?40c t j = 27c t j = 105c rdx vs()lo 0.4 0.5 0.6 v v v a 10.2 short circuit current low v(rdx) = 2v to v12, t < t off rdx isc()lo 250 300 400 ma a 10.3 leakage current v(rdx) = 0v to 40v, t < t off rdx ilk() ?5 +5 a a 10.4 free-wheeling voltage i(rdx) = 10ma, rdx = high, l = 0.2h rdx vf() 42 60 v a 11 watchdog 11.1 upper window time ros = 100k 1%, cos = 1nf 5% wdt tu(wdt) 22.2 24.6 27 ms a 11.2 lower window time ros = 100k 1%, cos = 1nf 5% wdt tl(wdt) 16.4 18 19.8 ms a 11.3 watchdog timeout ros = 100k 1%, cos = 1nf 5% wdt tt(wdt) 59.7 64.6 71 ms a 12 warning lamp wln 12.1 saturation voltage low i(wln) = 20ma, wln = low wln vs()lo 0.4 v a 12.2 short-circuit current low v(wln) = 1v to v12, wln = low wln isc()lo203050maa 12.3 threshold current high wln ith()hi 12 ma a 12.4 threshold current low wln ith()lo 8 ma a 12.5 hysteresis threshold current wln ithhys 0.25 1.5 ma a 12.6 threshold voltage detection wln vth() 2.25 2.75 v a 12.7 leakage current v(wln) = 0v to 40v, wln = high wln ilk() ?10 +10 a a 12.8 overcurrent filter time i(wln) > isc(wln)lo, t > t1 off wln tfi() 100 200 s a 12.9 fall time v(wln) from high = 90% -> low = 10% v12 wln tf() 10 s b 12.10 free-wheeling voltage i(wln) = 10ma, wln = high, l = 10h wln vf() 42 60 v a 5. electrical characteristics (continued) operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits
15 4964c?auto?11/10 atmel ata6842 13 reset 13.1 reset pulse duration resn tl(resn) 5.2 7.7 ms a 13.2 reset pulse duration resan tl(resan) 0.1 1 ms a 14 low-side driver outn 14.1 saturation voltage low i(outn) = 60ma, outn = low, t < t off outn vs()lo 1.2 v a 14.2 short-circuit current low v(outn) = 2v to v12, outn = low outn isc()lo 60 90 120 ma a 14.3 threshold current high outn ith()hi 12 ma a 14.4 threshold current low outn ith()lo 8 ma a 14.5 hysteresis threshold current outn ithhys 0.25 1.5 ma a 14.6 threshold voltage detection outn vth() 2.25 2.75 v a 14.7 leakage current v(outn) = 0v to 40v, outn = high outn ilk() ?10 +10 a a 14.8 overcurrent filter time i(outn) > isc(outn)lo, t > t1 off outn tfi() 100 200 s a 14.9 fall time v(outn) from high = 90% -> low = 10% v12 outn tf() 10 s b 14.10 free wheeling voltage i(outn) = 10ma, outn = high, l = 10h outn vf 42 60 v a 15 high-side driver outp 15.1 saturation voltage high vs(outp) = v12 v(outp), i(outp) = ?10ma, outp = high, t < t off outp vs()hi 1 v a 15.2 short-circuit current v(outp) = 0v to v12 ? 2v, outp = high outp isc()hi ?25 ?15 ?10 ma a 15.3 threshold current high outp ith()hi ?5 ma a 15.4 threshold current low outp ith()lo ?2 ma a 15.5 hysteresis threshold current outp ithhys ?1 ?0.1 ma a 15.6 leakage current v(outp) = 0v to v12, outp = low outp ilk() ?10 +10 a a 15.7 overcurrent filter time i(outp) > isc(outp)hi, t > t1 off outp tfi() 100 200 s a 15.8 rise time v(outp) from low = 10% -> high = 90% v12 outp tr() 10 s b 5. electrical characteristics (continued) operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits
16 4964c?auto?11/10 atmel ata6842 16 watchdog oscillator rcos 16.1 oscillator frequency ros = 100k 1%, cos = 1nf 5% rcos f osc 91011khza 16.2 permissible frequency range no reset, f ? 1/(2 ros cos) rcos f osc 0.9 55 khz a 16.3 permissible resistor cos = 1nf rcos ros 20 100 k a 16.4 permissible capacitor ros = 100k rcos cos 1 10 nf a 16.5 short-circuit current low v(rcos) = vi rcos isc()lo 1 4 ma a 16.6 leakage current v(rcos) = 0% to 63.2% vi rcos ilk() ?5 +5 a a 17 main oscillator 17.1 main oscillator frequency rref = 10k 2% f mosc 82.5 100 120 khz a 18 comparator cxl, x = 1, 2 18.1 threshold voltage detection cxi vth(cxi) 1.1 1.23 1.4 v a 18.2 leakage current v(cxi) = 0v to v5 cxi ilk(cxi) ?10 +10 a a 18.3 propagation delay dv/dt > 1v/s cxi tpd(cx) 20 s b 19 tcfet 19.1 output voltage vo(tcfet) = v(tcfet) ? v12, v12 > 6.5v, i(tcfet) = ?20a to 0a tcfet vo() 4.5 10 v a 19.2 short-circuit current high v(bsc) = 0v to v12 ? 3v bsc isc(bsc)hi 1 25 ma a 19.3 saturation voltage high vd() = v(bsc) ? v(tcfet), tcfet = high, i(tcfet) = ?20a bsc vs()hi 1.5 v a 19.4 saturation voltage low tcfet = low, i(tcfet) = 50a tcfet vs()lo 200 mv a 19.5 short-circuit current high v(tcfet) = 0v, tcfet = high tcfet isc()hi ?250 ?50 ?25 a a 19.6 short-circuit current low v(tcfet) = 2v to v12, tcfet = low tcfet isc()lo 100 150 200 a a 19.7 leakage current v(bsc) = v12 to 36v, tcfet = low bsc ilk() ?10 +10 a a 5. electrical characteristics (continued) operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits
17 4964c?auto?11/10 atmel ata6842 20 v12s switch 20.1 saturation voltage high vs(v12s) = v12 ? v(12s), v12s = high, t < t2 off , i(v12s) = ?60ma v12s vs()hi 0.36 1.2 v a 20.2 short-circuit current high v(v12s) = 0v to v12 ? 2v, v12s = high v12s isc()hi ?150 ?90 ?60 ma a 20.3 leakage current v(v12s) = 0v to v12, v12s = low v12s ilk() ?10 +10 a a 21 uvm voltage monitoring 21.1 input voltage range uvm vir(uvr) 0.3 v5 0.9 v5 a 21.2 threshold on v(k30, uvm) r(k30, uvm) = 511 2% uvm vt(k30, uvm) 2.9 uvr 3.0 uvr 3.1 uvr a 21.3 input resistor uvm ri(uvm) 60 100 150 k a 21.4 undervoltage reference hysteresis based on v(k30, uvm) uvm vt(uvr) hys 0.02 uvr 0.06 uvr a 21.5 leakage current v(uvr) = 0v to v5 uvr ilk(uvr) ?5 +5 a a 21.6 leakage current v(uvm) = 0v to v12, standby uvm ilk(uvm) stb ?5 +5 a a 5. electrical characteristics (continued) operating conditions: v12 = 6.5v to 26v, v5 = 5v 3%, rref = 10k 2%, t j = ?40c to 150c, unless otherwise specified. no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter note: 1. reduced operation mode means either - r dson of drivers could be higher than specified or - voltage at pin tcfet could be beyond specified limits 6. operating conditions: spi interface v12 = 5.8v to 26v; t amb = ?40c to 105c parameters symbol min. max. unit cycle time t cycle 0.5 12.5 s low cycle time t cycle,lo 150 ns high cycle time t cycle,hi 150 ns setup time: di stable before clk high to low t setup 100 ns hold time: di stable after clk high to low t hold 100 ns access time: do stable after clk high to low t access 100 ns valid time: do stable before clk high to low t valid 100 ns
18 4964c?auto?11/10 atmel ata6842 7. functional description 7.1 bandgaps for voltage monitoring and as references for various voltage regulators, two independent bandgaps are used. the bandgaps for the generation and monitoring of the internal supply (v5 and v5a) are used in cross-over mode. 7.2 bias the external resistor at rref defines a curr ent reference for all blocks and determines main oscillator frequency. the current through the external resistor is monitored and in case of mal- function (pin open or short to ground; current is less than 0.25 times or greater than 8 times nominal value), a bias failure is detected (see table 7-9 on page 25 ). 7.3 temperature monitoring to protect the circuit from extensive temperature in error condition, two temperature levels are implemented to switch off various blocks. at the lower temperature level, the outputs wln, outn or outp are switched off after a debounce time, if the corresponding driver is in current limitation. the warning lamp is switched on above the upper temperature level. all other drivers and the linear regulators will switch off. if the temperature level falls below the shutdown temperature (hysteresis), all driver s except tcfet and the relay driv ers will go to their previous state. 7.4 enable/standby the power consumption of atmel ? ata6842 is reduced to a minimum via inputs e5 or ek15 (sleep mode). with the signal ten via spi command, the inputs e5 and ek15 can be overwrit- ten and the atmel ata6842 will stay active (kee p-alive function). the status of ek15 can be read via spi. 7.5 v12 voltage monitoring the system supply is checked for overvoltage and undervoltage at the internal voltage divider. if the voltage exceeds the limits, the drivers are switched off and a reset at resn and resan is generated (see table 7-9 on page 25 ). table 7-1. enable/standby table e5 ek15 ten (spi) atmel ata6842 high x x active xhigh x active low low high active low low low standby
19 4964c?auto?11/10 atmel ata6842 7.6 5v linear regulators the atmel ? ata6842 offers two independent 5v supplies. the main supply (v5) is available only in active mode while the auxiliary 5v s upply (v5a) is active all the time . the atmel ata6842 activates the basis of external bipolar transistors via pins b5 and b5a. the currents of the regulators v5 (150ma) and v5a (30ma), defined in the datasheet, can only be achieved if the external transistors fulfil certain requirements in terms of current amplification and transit frequency. especially for v12 = 5.8v a low saturation voltage of b5 and b5a in combination with the forward diode voltage and a low saturation voltage (uce,sat) of the external bipolar transistors is required. for fast load changes at v5 a high transit frequency is necessary (typi- cally f t > 100mhz). for voltage monitoring and as references for the voltage regulators two independent band- gaps are used. the voltage monitoring functions of v5 and v5a generate a reset pulse at resn and resan if the limits are exceeded (see table 7-9 on page 25 ). for internal voltage supply, an additional linear regulator (vi) is implemented. 7.7 current measurement the atmel ata6842 contains two differential amplifiers for current measurement. the input signal of each amplifier is a voltage drop over an external current sense resistor. the amplifi- cation, defined by the ratio of external resistors, provides a reasonable signal for the following a/d converter. the output is limited to v5. 7.8 relay driver the atmel ata6842 features four current-limit ed relay drivers for motor direction control relays. the relays are controlled by an spi command and the input of the enable relay driver (erd). error conditions disable the relays permanently (see table 7-9 on page 25 ). note: the simultaneous activation of the relay drivers rd1 and rd4 or rd2 and rd3 is not possible (see table 7-2 and table 7-3 ). this feature ensures that if atmel ata6842 is used in dc motor application, the motors can only operate in the same direction. table 7-2. relay status table trd1 (spi) trd2 (spi) erd rd1 rd2 low low x open drain open drain low high high open drain low high low high low open drain high high high open drain open drain x x low open drain open drain table 7-3. relay status table trd3 (spi) trd4 (spi) erd rd3 rd4 low low x open drain open drain low high high open drain low high low high low open drain high high high open drain open drain x x low open drain open drain
20 4964c?auto?11/10 atmel ata6842 7.9 watchdog the open loop watc hdog (window comparator) compares ea ch time interval between a falling and a rising edge with a given reference time in terval. the lower window time is between 90 t wd and 91 t wd and the upper window time is between 122 t wd and 123 t wd (t wd =2/f osc ). the watchdog includes an error counter wdc(2:0) which is incremented by one when there are valid trigger events and decremented by three when there are watchdog errors. if the counter reaches a value of zero (state s0: 000), the warning lamp will be switched on. relay drivers, tcfet-, low- and high-side drivers are disabled. with a counter value greater than or equal to seven (state s7: 111), the watchdog stops affecting the drivers. in the case of a watchdog timeout (322 t wd to 323 t wd ), the error counter is immediately set to zero. the initial state of the watchdog counter after power-up or if resn is low is 110 (state s6). the watchdog can be reset by rstn. figure 7-1. state diagram s0 000 s1 001 s5 101 s6 110 s7 111 s4 100 s3 011 s2 010 bad | timeout bad | timeout bad | timeout timeout timeout timeout good good good good good bad bad bad bad bad good good good timeout
21 4964c?auto?11/10 atmel ata6842 7.10 warning lamp the atmel ? ata6842 features a watchdog-controlled output, wln, which can be used to switch a warning lamp. depending on the warning lamp polarity pin (wlp), the warning lamp output is switched either to low level or to open drain, when a warning lamp request (that is, on in table 7-9 on page 25 , column wln ) occurs or the corresponding spi command is trans- mitted. for the behavior of wln output refer to table 7-4 . the driver is short-circuit proof and will switch off after a debounce time. an activation of the warning lamp due to warning lamp request is suppressed for 768 t wd after wake-up to avoid a flickering of the warning lamp during the start-up phase (exception: lower thermal threshold level reached). the driver also has a current sensor and a voltage monitoring which sets spi flags if the corresponding thresholds are reached. warnlamp is open drain during s uppression time after wake-up. if the oscillator does not work 4ms after start up, the internal oscillator watchdog timeout is reached and the warning lamp is switched on. 7.11 reset when v12, vi, v5 or v5a are beyond their corresponding normal operating range or the tem- perature has reached the upper temperature level, a reset is indicated at the outputs resn (640 t mos ;t mos =1/f mos ) and resan. additionally, resan can be activated by an spi com- mand. via input rstn, the spi interface and the watchdog can be reset by an external signal (see table 7-9 on page 25 ). table 7-4. warning lamp status table warnlamp request twln (spi) overcurrent in wln occurred thermal threshold #1 reached suppression time after wake-up/vi reset v12 wlp wln yes x x no t < 768 t wd > 4.8v low open drain yes x x no t > 768 t wd > 4.8v low low ye s x n o ye s t < 7 6 8 t wd > 4.8v low open drain ye s x n o ye s t > 7 6 8 t wd > 4.8v low low no high x no t > 768 t wd > 4.8v low low no low x no x > 4.8v low open drain yes x yes yes x > 4.8v low open drain yes x x no x > 4.8v high open drain yes x no yes x > 4.8v high open drain no high x no t > 768 t wd > 4.8v high low no low x no x > 4.8v high open drain no high yes yes x > 4.8v high open drain no high no yes x > 4.8v x open drain x x x x x < 4.8v x open drain
22 4964c?auto?11/10 atmel ata6842 7.12 spi interface the atmel ? ata6842 supports an 8-bit spi interface to communicate with the microprocessor. the msb is transmitted first. there are two status registers (address 0xxxxx01 and 0xxxxx10) and two control registers (add ress 1xxxxx01 and 1xxxxx10). table 7-5. status register 0xxxxx01 request by microprocessor bit name meaning function 7 c1o comparator 1 output 0: comparator c1i below threshold 1: comparator c1i above threshold 6 ek15s ek15 status 0: ek15 below threshold 1: ek15 above threshold 5 wlps warnlamp polarity status 0: pin wlp = low 1: pin wlp = high 4 ots overtemperature status 0: normal operation 1: overtemperature present or overtemperature detection switched off 3 wdok watchdog status 0: watchdog ok 1: watchdog failure 2:0 wdc(2:0) watchdog counter bit 2:0 status of watchdog counter table 7-6. status register 0xxxxx10 request by microprocessor bit name meaning function 7 wlnoc warnlamp overcurrent 0: no overcurrent 1: overcurrent 6 onoc outn overcurrent 0: no overcurrent 1: overcurrent 5 opoc outp overcurrent 0: no overcurrent 1: overcurrent 4 wlncs warnlamp current status 0: current below threshold 1: current above threshold 3 oncs outn current status 0: current below threshold 1: current above threshold 2 opcs outp current status 0: current below threshold 1: current above threshold 1 wlnvs warnlamp voltage status 0: voltage below threshold 1: voltage above threshold 0 onvs outn voltage status 0: voltage below threshold 1: voltage above threshold
23 4964c?auto?11/10 atmel ata6842 for operation of spi communication see the following timing diagrams (see figure 7-2 and figure 7-3 on page 24 ). with a low signal at csn, the atmel ? ata6842 will be selected for communication by the microprocessor. with clock pulses at clk, the address and data transfer will be synchronized. di is the input for address and data from the microprocessor to atmel ata6842. the data must be valid at the fa lling edge of the clk pin. do transfers data from atmel ata6842 to the microprocessor. table 7-7. control register 1xxxxx01 sent by microprocessor bit name meaning function comment 7twln trigger warning lamp 0: wln = off 1: wln = on see table 7-4 on page 21 and table 7-9 on page 25 6 toutn trigger outn 0: outn = off 1: outn = on see table 7-10 and table 7-11 on page 26 5 toutp trigger outp 0: outp = off 1: outp = on see table 7-10 and table 7-11 on page 26 4ten trigger enable (keep alive) 0: no keep alive 1: keep alive see table 7-1 on page 18 3tv12s trigger v12 switch 0: v12s = off 1: v12s = v12 used in testmode 3 see table 7-9 on page 25 2tuvr trigger undervoltage reference 0: if uvm < 3 uvr => uvw = low 0: if uvm > 3 uvr => uvw = high 1: uvw = low 1 ? ? ? no function 0otde overtemperature detection enable 0: temperature detection off 1: temperature detection on set ots = high if overtemperature => ots = high, else low note: bold: default state after reset by rstn = low table 7-8. control register 1xxxxx10 sent by microprocessor bit name meaning function comment 7 ttcfet trigger test current fet 0: tcfet = off 1: tcfet = on see table 7-9 on page 25 6 tresan trigger resan 0: default 1: resan = reset (low) 5 ? ? ? no function 4 trd4 trigger relay driver 4 0: rd4 = off 1: rd4 = on if rd3 = off see table 7-2 on page 19 , table 7-3 on page 19 and table 7-9 on page 25 3 trd3 trigger relay driver 3 0: rd3 = off 1: rd3 = on if rd4 = off 2 trd2 trigger relay driver 2 0: rd2 = off 1: rd2 = on if rd1 = off 1 trd1 trigger relay driver 1 0: rd1 = off 1: rd1 = on if rd2 = off 0 ? ? ? no function note: bold: default state after reset by rstn = low
24 4964c?auto?11/10 atmel ata6842 the request command structure (to read a status register of atmel ? ata6842) consists of a two-byte transmission. the control command structure (to write a control register of atmel ata6842) consists of a three-byte transmissi on with eight clock pulses each and a low/high transition at csn. the first byte is for identification. all request command id bytes shall have a ?0? in their most significant bit. the address is transmitted by the last two bits. in the second byte (which can be a dummy byte (0x00) or next command), the status register corresponding to the address of the first byte will be sent by do. at start-up, the re turned value when the first command is sent will be zero (no 'last com- mand' available). figure 7-2. request command structure (read register) all control command id bytes shall have a ?1? in th eir most significant bit. the address is trans- mitted by the last two bits. the second byte is th e data byte which contains the control data for the send command. with the second low to high transition of csn the data is stored in atmel ata6842. the spi logic monitors for faulty communication. to check which data is received at atmel ata6842 in the second and third clock cycle, the address and data are sent back to the micro- processor and tested to verify that the transmission was correct. the first data byte at do is the response byte of the last command while the third di byte is the address for the next data. if there is no next command, the address can be set to 0x00. figure 7-3. control command structure (write register) the 8 clk pulses must be received when csn is triggered, otherwise the address and/or data will be ignored and zeros will be returned on do. the minimum time for receiving during csn = low is t 100s; otherwise, a timeout expires and the receiving is stopped. any received data is ignored. therefore, the minimum clock fre- quency is 80khz for spi transmission. data0 data1 data2 data3 data4 data5 data6 data7 0x csn clk di do xx xx adr0 adr1 0xxxxx adr0 adr1 adr0 adr1 adr7 data0 data1 data2 data3 data4 data5 data7 adr0 x x x x 1x adr1 data6 csn clk di do adr1 data0 data1 data7 adr0 adr2 adr3 adr5 adr4 adr6 adr7
25 4964c?auto?11/10 atmel ata6842 7.13 external voltage regulator vre the atmel ? ata6842 can control an external voltage regulator with enable input. the vre output provides the same logic as for the v5 regulator (see table 7-9 ). for v5 voltage monitor- ing, the external generated voltage must be connected to v5. table 7-9. logic table event vi v5 vre v5a spi info wln rd1 to rd4 resn resan v12s outx x=n,p tcfet standby off off on ? off off ? no reset off off off v12 undervoltage on off off no off off reset reset off off off vi undervoltage on off on no off off reset no reset off off off vi overvoltage on off on no on off reset no reset off off off oscillator/bias failure on off o ff no on off reset reset off off off v12 overvoltage on off off no on off reset reset off off off upper thermal threshold on on on yes on (4) off reset reset off (5) off off reset by rstn on on on no on off no reset no reset off off off v5 out of range on on on no on off reset no reset off off off v5a out of range on on on no on off no reset reset off off off short circuit wln (overcurrent) on on on yes off (1) on/off no reset no reset on/off on/off on/off short circuit outx (overcurrent) on on on yes off on/off no reset no reset on/off on/off (1) on/off watchdog error on on on yes on off no reset no reset on/off off off off mode ? ? ? ? ? perm (3) ??temp (2) te m p pe r m note: 1. corresponding driver is switched off if thermal threshold number 1 is reached 2. temp = temporary state, recovery when event condition is re moved, except vi out of over -/undervoltage, thermal threshold number 2 reached or reset by rstn 3. perm = permanent state, no recovery when event condit ion is removed, must be re-engaged by spi command 4. if no overcurrent in wln 5. not testable
26 4964c?auto?11/10 atmel ata6842 7.14 low-/high-side driver atmel ? ata6842 features two multipurpose outputs, a low-side driver outn and a high-side driver outp. both drivers are controlled via spi and are short-circuit proo f (they will switch off after a debounce time if a short circuit is detec ted). during a short-circuit condition the corre- sponding spi flag is set. the drivers are dis abled by a watchdog error or during the reset phase. both drivers also have an current s ensor and outn has a voltage monitor which sets spi flags if the corresponding thresholds are reached. 7.15 oscillators the watchdog oscillator provides an intern al frequency of f wd = 5 khz 10% given by external components. r os = 100k 1% and c os = 1nf 5% for the watchdog. for failsafe reasons, the clock fre- quency is internally monitore d by an oscillator with rref = 10k running at f osc = 100khz 20%. this oscillator determines all other time constants. the watchdog oscil- lator frequency can be adjusted by a factor of five with the components r os and c os according to the formula: f wd =1/t wd where the first term describes charging the external rc, and the second term describes discharging. with r os =100k and c os = 1nf the period of rcos will result to typically t osc = 100 (1 + 0.012)s. f wd is half of the frequency measured externally at the rcos pin. an oscillator failure generated by the oscillator watchdog occurs if the period of rcos is smaller than t osc or greater than 200 t osc , f osc =1/t osc . for oscillator failure, see table 7-9 on page 25 . table 7-10. logic table for low-side driver toutn (spi) overcurrent and thermal threshold number 1 reached watchdog outn high no ok low low no ok open drain x no error open drain x yes x open drain table 7-11. logic table for high-side driver toutp (spi) overcurrent and thermal threshold number 1 reached watchdog outp high no ok high low no ok open drain x no error open drain x yes x open drain t wd 2r os c os 1 0.632 vi i sc r os 0.684 vi ? ------------------------------------------------------------ + ?? ?? =
27 4964c?auto?11/10 atmel ata6842 7.16 12v switch via an spi command, the voltage at pin v12 can be switched to pin v12s (see table 7-9 on page 25 ). the 12v switch has a current limitation. 7.17 comparator the atmel ? ata6842 has two comparators. they compare inputs cxi in reference to the bandgap voltage. there are no internal pull-ups or pull-downs. the output is a v5-based push-pull stage. a hysteresis can be implemented by external resistors. additionally, the out- put of comparator number 1 can be read out via spi. 7.18 tcfet driver the atmel ata6842 features a circuit to drive an external n-channel fet. the control voltage is generated by a charge pump with bootstrap circuit for faster power-up behavior. activation is done by an spi command (see table 7-9 on page 25 ). 7.19 uvm voltage monitoring an undervoltage warning is indicated at output uvw if v12 falls below 3 uvr. this refer- ence- voltage level can be adjusted by an extern al resistor divider. the undervoltage warning can be tested with an spi command.
28 4964c?auto?11/10 atmel ata6842 9. package information 10. revision history 8. ordering information extended type number package remarks ata6842p-plqw qfn48 taped and reeled, lead-free 0.4 0.1 48 48 37 13 24 12 25 36 7 5.5 4.5 0.5 nom. 12 1 1 specifications according to din technical drawings issue: 2; 24.01.03 drawing-no.: 6.543-5089.01-4 package: qfn 48 - 7 x 7 exposed pad 4.5 x 4.5 (acc. jedec outline no. mo-220) dimensions in mm not indicated tolerances 0.05 0.23 0.05 -0.05 1 max. +0 please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. revision no. history 4964c-auto-11/10 ? section 8 ?ordering information? on page 28 changed.
atmel corporation 2325 orchard parkway san jose, ca 95131 usa tel: (+1)(408) 441-0311 fax: (+1)(408) 487-2600 atmel asia limited unit 01-5 & 16, 19/f bea tower, millennium city 5 418 kwun tong road kwun tong, kowloon hong kong tel: (+852) 2245-6100 fax: (+852) 2722-1369 atmel munich gmbh business campus parkring 4 d-85748 garching b. munich germany tel: (+49) 89-31970-0 fax: (+49) 89-3194621 atmel japan 9f, tonetsu shinkawa bldg. 1-24-8 shinkawa chuo-ku, tokyo 104-0033 japan tel: (+81) (3) 3523-3551 fax: (+81) (3) 3523-7581 ? 2010 atmel corporation. all rights reserved. / rev.: 4964c?auto?11/10 atmel ? , atmel logo and combinations thereof, and others are registered trademarks or trademarks of atmel corporation or its subsidiar ies. other terms and product names may be trademarks of others. disclaimer: the information in this document is provided in con nection with atmel products. no license, express or implied, by estoppel or otherwise, to any intellec- tual property right is granted by this document or in connection with the sale of atmel products. except as set forth in the at mel terms and conditions of sales located on the atmel website, atmel assumes no liability whatsoever and disclaims any express, implied or statutory warranty relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particu - lar purpose, or non-infringement. in no event shall atmel be liable for any direct, indirect, consequential, punitive, special or incidental damages (including, without limitation, damages for lo ss and profits, business interruption, or loss of information) arising out of the use or inabil ity to use this document, even if atmel has been advised of the possibility of such damages. at mel makes no representations or warranties with respect to the accura cy or completeness of the contents of this document and reserv es the right to make changes to specifications and products descriptions at any time without not ice. atmel does not make any commitment to update the informati on contained herein. unless specif- ically provided otherwise, atmel produc ts are not suitable for, and shall not be used in, automotive applications. atmel produc ts are not intended, authorized, or war- ranted for use as components in applicatio ns intended to support or sustain life.

▲Up To Search▲

Price & Availability of ATA6842-PLQW

	To Download ATA6842-PLQW Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .