ats671lse specification preliminary ? subject to change pin out diagram self calibrating tpos gear tooth sensor with 9bit signal capture pin 1: v cc pin 2: v out pin 3: test pin (tie to gnd) pin 4: gnd the ats671lse true zero speed gear tooth sensors are optimized hall ic/magn et configurations packaged in a single in line package (sip) that provides a user - friendly solution for digital gear tooth sensing applications. the sip module consists of an over - molded package, which holds together a samarium cobalt magnet, a pole piece and a true zero - speed hall ic that has been optimized to the magnetic circuit. this package can be easily assembled and used in conjunction with gears of various shapes and sizes. the sensor incorporates a single element hall ic that switches in respons e to the magnetic signal created by a ferrous target. the ic contains a sophisticated digital circuit designed to eliminate the detrimental effects of magnet and system offsets. signal processing is used to provide zero speed performance independent of ai r gap and also to dynamically adapt device performance to the typical operating conditions found in automotive applications (reduced vibration sensitivity). high - resolution (9 - bit) peak detecting dacs are used to set the adaptive switching thresholds of th e device. hysteresis in the thresholds reduces the negative effects of any anomalies in the magnetic signal (such as magnetic overshoot) associated with the targets used in many automotive applications. the ats671lse also includes a low bandwidth filter th at increases the noise immunity and the signal to noise ratio of the sensor. these features result in potential improvements in both the timing accuracy and the jitter performance of the device. the ats671lse - lt sensor system is optimized for cam applica tions and is available with or without the tpos function absolute maximum ratings supply voltage, v cc . . . . . . . . . . . . . . . . . . . . . . . . . . 26.5 v reverse supply voltage, v r . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? 18 v r everse output voltage, v orout . . . . . . . . . . . . . . . . . . . . . . . . . - 0.5 v continuous output current, i out . . . . . . . . . . . . . . . . . . . . . . . . . . 20 ma storage temperature, t s . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 c package power rating, j ja .sb. . . . . . . . . . . . . . . . . . . ~150 c/w maximum junction temperature, t jmax . . . . . . . . . . . . . . . . . . . . . . . . . 170 c maximum junction temperature ? 100 hours, t jmax . . . . . . . . . . . . . . . . . . . . . . . . . 180 c features s tight timing accuracy over temperature s true zero speed operation s true power on state s air gap independent switch points s high vibration immunity s large operating air gaps s operation down to 3.3v s digital output repr esenting target profile s single chip solution for high reliability s small mechanical size s optimized hall ic magnetic system s agc and reference adjust circuit s under - voltage lockout
ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 2 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. operating characteristics valid at t a = - 40c to 150c and power supply wi thin specification unless otherwise noted limits characteristics symbol test conditions min. typ. max. units electrical characteristics supply voltage v cc operating; tj < tjmax 3.3 26.5 v reverse supply voltage v rcc i rcc = - 5ma (max) - 18 v suppl y zener clamp voltage v z 28 33 37 v supply zener current i z tj < tjmax; pulsed 100 ma output = off 3 6.5 11 ma supply current i cc output = on 3 6.5 11 ma power - on state characteristics power up time t po gear speed < 100 rpm; vcc> 3.3v - 500 us under voltage lockout v uv - ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 3 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. limits characteristics symbol test conditions min. typ. max. units switch point characteristics tooth speed s max 0 8 k hz bandwidth f - 3db 40 khz operate point bop% % of peak to peak referenced to tooth signal, ag < agmax; +40 % release point brp% % of peak to peak referenced to tooth signal, ag < agmax; +50 % over valley high output polarity vout over tooth low calibration initial calibration c i number of rising mechanical edges for accurate edge detection 3 edges agc disable c f number of rising mechanical edges required to complete agc calibration 3 edges tooth signal valley signal 100% brp% bop% brp% bop% switchpoints
ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 4 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. operation with 8x reference tar get over operational air gap and temperature with test circuit #1 unless otherwise stated limits characteristics symbol test conditions min. typ. max. units t icrel rising and falling edge, rpm = 1000 during initial calibrati on gear eccentricity < 0.1mm 3 6 t rel rising mechanical edge after initial calibration, rpm = 1000 gear eccentricity < 0.1mm - 0.5 0.8 1 relative timing accuracy t rel falling mechanical edge after initial calibration, rpm = 1000 gear eccentricity < 0.1mm - 0.8 1.2 2 tpos air gap min ag min valleys may be detected as teeth: incorrect tpos - - 0.5 mm 3 tpos air gap range ag tpos distance for correct tpos functionality 0.5 - 2.5 mm 4 tpos air gap max ag max teeth may be detected as a valley: incorrect tpos 2.5 - 5.0 mm operational air gap range ag output switching: running mode only 0.5 - 2.5 mm edge repeatability t q e 360 repeatability, 1000 edges 0.04 1 relative timing accuracy range is the change in edge position over the operational air gap and temperature range. 2 th e tpos air gap min is the installation air gap where the device may detect valleys as teeth. the true power on function is not guaranteed to operate. 3 the tpos air gap range is the installation air gap range where the true power on function is guarante ed to operate. operating is defined as correctly detecting a tooth when powered up over a tooth and correctly detecting a valley when powered up over a valley using the reference target. this specification is only valid for targets that meet or exceed th e ? gear parameters for correct tpos operation? section of this document. 4 the tpos air gap max is the installation air gap where the device may detect a tooth as a valley. the true power on function is not guaranteed to operate.
ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 5 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. rise and fall time target relative timing accuracy device output t absrise (max - min) t absfall (max - min) tooth operational air gap valley air gap target absolute timing accuracy device output t absrise t absfall t absfall (max - min) tooth tpos air gap valley tpos air gap min tpos air gap range tpos air gap max output rise time: r=500ohms c=10pf output fall time: r = 500ohms c = 10pf
ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 6 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. reference target dimensi ons target diameter (d o ) thickness (f) tooth width (t) valley width (p c ? t) valley depth (h t ) reference target 120mm 6mm 22.5 (23.6mm ? 120mm) 22.5 (23.6mm ? 120mm) 5mm gear parameters for correct tpos operation limits characteristic des cription min. typ. max. units valley depth (h t ) depth of target valley 5 - - mm valley width (p c ? t) length and width of target valley 13 - - mm tooth width (t) width of target tooth 5 - - mm thickness (f) thickness or length of target tooth 5 - - mm 1 material properties : crs 1018 1 the target must gen erate a minimum of 120 gauss difference between the tooth field and the valley field at the maximum installation air gap. with the materiel and dimensions mentioned above the target will generate the required 120 gauss. reference target reference target dimensions
ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 7 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. mechanical information component material function value smco ? r22 8mmdx4mml sensor package material thermoset epoxy max. temperature 170c 1 leads copper, 0.016? dia, 0.050? spacing lead coati ng solder, tin / lead 90/10 2 1 temperature excursions of up to 225c for 2 mins or less are permitted. 2 all industry accepted soldering techniques are acceptable for this sub - assembly as long as the indicated maximum temperatures for each component are not exceeded. device qualification program test name test conditions test length # of lots sample / lot comments pre/post test ta = room, hot, cold high temperature operating life (htol) ta = 150c, tj = 170c 408 hrs 1 77 jesd22 - a108 high tem perature bake (htb) ta = 170c 1000 hrs 1 77 jesd22 - a103 pre conditioning (pc) 85c/85%rh 168 hrs 1 231 jesd22 - a112 & a113 temperature humidity bias (thb) or hast 85c/85%rh 130c/85%rh 1000 hrs 50 hrs 1 77 jesd22 - a101 jesd22 - a110 autoclave (ac) 121c/1 5 psig 96 hrs 1 77 jesd22 - a102 temperature cycle (tc) - 65c to +150c or - 50c to +150c 500 cycles 1000 cycles 1 77 jesd22 - a104 external visual (ev) physical dimensions (pd) 1 30 lead integrity 1 45 bond pull strength 1 30 esd hbm & mm 1 3 per model per v step jesd22 - a114 & a115,cdf - aec - q100 - 002, 003 & 011 solderability (sd) 1 15 jesd22 - b102 early life failure rate (elfr) 125c or 150c 48 hrs 24 hrs 1 800 jesd22 - a108 gate leakage (gl) 1 6 cdf - aec - q100 - 006 electrical dis tributions (ed) ta = room, hot, cold 3 30
ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 8 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. function block diagram electromagnetic capability (emc) performance please contact allegro microsystems for emc performance test name reference specification esd ? human body model aec - q100 - 002 esd ? machine model aec - q100 - 003 conducted transients iso 7637 - 1 direct rf injection iso 11452 - 7 bulk current injection iso 11452 - 4 tem cell iso 11452 - 3 pin2 output state threshold comparator vthresh pdac ats671 / 672 block diagram output driver clk aggressive update logic 9 - bit counter 9 - bit pdac output state comp_p diff tpos output tpos tpos trim hall amp ndac diff automatic gain control vref diff clk aggressive update logic 9 - bit counter 9 - bit ndac output state comp_n internal regulator (analog) internal regulator (digital) 1m osc por offset adjust tc adjust offset tc lpf threshold output power on initialize threshold output pin1 vcc ats6 71lse functional block
ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 9 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. timing accuracy vs. air gap over temperature: relative timing accuracy vs. air gap rising mechanical edge over temperature 24 24.2 24.4 24.6 24.8 25 25.2 25.4 25.6 25.8 26 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 air gap [mm] relative edge position [] -40 25 100 160 reference target: diameter: 120mm rpm: 1000 relative timing accuracy vs. air gap falling mechanical edge over temperature 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 air gap [mm] relative edge position [] -40 25 100 160 reference target: diameter: 120mm rpm: 1000
ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 10 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. power de - rating curve: ats671lse package power de - rating due to internal power consumption, the temperature of the ic (junction temperature, tj) is higher than the ambient environment temperature, ta. to ensure tha t the device does not operate above the maximum rated junction temperature use the following calculations: d t=p d * r q ja where p d =vcc * icc \ d t=vcc * icc * r q ja where d t denotes the temperature rise resulting from the ic?s power dissipation: tj = ta + d t r q ja=103c/w tj(max) = 170c typical tj calculation: ta=25c, vcc=5v, icc(on)=6.5ma p d =vcc * icc p d = 5v * 6.5ma = 32.5mw d t=p d *r q ja = 32.5mw * 103c/w = 3.35 tj = ta + d t = 25c + 3.35c = 28.35c maximum allowable power dissipation calculation tj = ta + d t tj(max) = 170c, if ta=160c then: 170 = 160 + d t d t = 10c d t = p d *r q ja (r q ja = 103c/w) \ p d(max) = 10c / 103c/w = 97.1mw @ ta = 160c maximum vcc for p d(max) = 111mw at ta=160c p d =vcc * icc icc = 10ma (max) at 160c vcc = p d / i cc = 97.1mw / 10ma = 9.71volts maximum power dissipation vs. ambient temperature se package: thermal resistance: 103c/watt 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 ambient temperature [c] maximum allowable power dissipation [mw]
ats671lse self calibrating tpos gear tooth sensor with 9bit signal capture preliminary ? subject to change rev. 1.3, mhn, 09.may.2003 page 11 of 11 115 n ortheast cutoff, box 15036 worcester, massachusetts 01615 - 0036 (508) 853 - 5000 copyright ? 1993, 1995 allegro microsystems, inc. se package drawing tolerances unless otherwise specified: 1 place + - 0.1mm, 2 places + - 0.05mm
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