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description the ats601lsg is a unique addition to the allegro? camshaft sensor ic family of products. as a single element, defined power?on state, sensor ic, it provides first falling edge detection, high running mode edge accuracy, and direction/orientation insensitivity over the full operating range of air gap, speed, and temperature. the ats601lsg consists of an optimized hall ic and a simple magnetic pellet configuration. the single element hall ic and magnetic pellet configuration switches in response to magnetic signals created by a ferromagnetic target. the ic contains a low bandwidth filter that increases the noise immunity and the signal?to?noise ratio of the sensor ic. sophisticated digital circuit design eliminates the detrimental effects of target geometry discontinuity, magnet and system offsets, and thermal gradients. signal processing is used to provide zero speed performance independent of air gap and also to dynamically adapt device performance to the typical operating conditions found in automotive applications, particularly camshaft sensing. the resulting output of the device is a digital representation of the ferromagnetic target profile. a number of factory programmable options allow for performance optimization to meet specific application requirements. the ats601 is provided in a 4?pin sip package (suffix sg) that is lead (pb) free, with 100% matte tin leadframe plating. ats601lsg?ds features and benefits ? digital output representing target profile ? single hall element for twist?insensitive mounting and direction insensitive polarity ? true zero?speed operation ? defined power-on state ? air gap independent switchpoints ? chopper stabilized ? operation down to 3.3 v ? factory programmable options: ? output polarity: low or high opposite tooth ? startup hysteresis: 40 g or 80 g ? threshold location: 30% or 50% from signal peak ? threshold update: single tooth (continuous) or four? tooth memory ? fully synchronous digital logic with scan path and iddq testing single element, tooth detecting speed sensor ic package: 4?pin sip (suffix sg) functional block diagram ats601lsg not to scale internal regulator (analog) internal regulator (digital) vcc current limit out gnd multiplexed test signals synchronous digital controller tooth detection offset control application trim stop mode timer test hall amplifier offset adjust chopper stabilization adc low pass filters temperature compensation
single element, tooth detecting speed sensor ic ats601 2 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com selection guide part number packing* ats601lsgtn?[ a ]?[ aan ]?t 800 pieces per 13?in. reel *contact allegro? for additional packing options. a running mode threshold update 1: single-tooth (continuous) 4: four-tooth (memory-based) switchpoint level u: upper (30% less than input signal peak) m: mid (50% less than input signal peak) startup hysteresis n: narrow (40 g) w: wide (80 g) output polarity lt: low opposite target tooth ht: high opposite target tooth allegro identifier and device type ? ats601 operating temperature range, t a ? l: ?40c to 150c package designator ? sg instructions (packing) ? tn: tape and reel, 800 pieces per 13-in. reel a t n ats601lsgtn leadframe plating ? t : 100% matte tin configuration options -- - a absolute maximum ratings characteristic symbol notes rating unit supply voltage v cc 27 v reverse supply voltage v rcc ?18 v reverse supply current i rcc ?50 ma output voltage v out 27 v reverse output voltage v rout r pu > 1000 ?0.5 v output current i out internal current limiting is intended to protect the device from output short circuits, but is not intended for continuous operation. 25 ma reverse output current i rout v out > ?0.5 v, t a = 25c ?50 ma operating ambient temperature t a l temperature range ?40 to 150 oc maximum junction temperature t j (max) 165 oc storage temperature t stg ?65 to 170 oc terminal list table name number function vcc 1 supply voltage out 2 open drain output test 3 test pin (mux) gnd 4 ground pin?out diagram 24 3 1
single element, tooth detecting speed sensor ic ats601 3 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com operating characteristics valid using allegro reference target 8x, and v cc and t a within specification; unless otherwise specified characteristic symbol test conditions min. typ. 1 max. unit 2 electrical characteristics supply voltage 3 v cc continuous operation, t j < t j (max) 3.3 ? 24 v undervoltage lockout 4 v cc(uv)rise rising v cc (0 v 5 v) 2.5 ? 3.1 v v cc(uv)fall falling v cc (5 v 0 v) 2.4 ? 3.0 v supply zener clamp voltage v zsupply i cc = i cc (max) + 3 ma; t a = 25c 27 ? ? v reverse supply zener clamp voltage v rzsupply i cc = ?3 ma, t a = 25c ?18 ? ? v supply current i cc 4 ? 10 ma power-on characteristics power-on time 5 t po v cc > v cc (min) ? ? 1 ms power-on state 6 pos connected as in figure 1 ? high ? v output stage characteristics output on voltage v out(sat) i out = 15 ma, output = on state (v out = low) ? ? 450 mv output zener clamp voltage v zoutput i out = 3 ma, t a = 25c 27 ? ? v output current limit i out(lim) output = on state (v out = low) 25 ? 80 ma output leakage current i out(off) v out = 24 v, output = off state (v out = high) ? ? 10 a output rise time t r measured 10% to 90% of v out ; r pu = 1 k , c l = 4.7 nf, v pu = 5 v; see figure 2 ?10? s output fall time t f measured 90% to 10% of v out ; r pu = 1 k , c l = 4.7 nf, v pu = 5 v; see figure 2 3610 s output delay time 7 t d 1 khz sinusoidal input signal; see figure 3 ? 50 ? s performance characteristics operational air gap range 8 ag n option allegro 8x reference target 1.0 ? 3.0 mm w option 0.5 ? 2.5 mm magnetic signal range b sig n option peak to peak signal 60 ? 1000 g pkpk w option 120 ? 1000 g pkpk analog signal bandwidth bw equivalent to ?3 db cutoff frequency ? 8 ? khz continued on the next page? c bypass 0.1 f v s v pu r pu c l 1 4 3 2 vcc out test (float) output gnd ats601 figure 1. typical application circuit figure 2. output rise time and output fall time t f t r v+ % 100 90 10 0 v out(high) v out(low)
single element, tooth detecting speed sensor ic ats601 4 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com operating mode characteristics output polarity v out lt option opposite target tooth, connected as in figure 1 ? low ? v ht option ? high ? v startup hysteresis b hys(su) n option amount of signal movement needed to generate first output edge ?40? g w option ? 80 ? g threshold update memory ? 1 option number of target teeth (peaks) stored in memory for threshold update algorithm ? 1 ? tooth 4 option ? 4 ? tooth running mode switchpoint b st u option % of peak-to-peak, referenced to tooth signal, see figure 4 25 30 35 % m option 45 50 55 % running mode internal hysteresis b hys(rm) % of peak-to-peak signal 5 10 15 % stop mode timer period t sm timer interval to initiate stop mode, no sensed magnetic edges ?5?s chopper frequency f c ? 167 ? khz 1 typical values are at t a = 25c and v cc = 12 v. performance may vary for individual units, within the specified maximum and minimum limits. 2 1 g (gauss) = 0.1 mt (millitesla). 3 maximum voltage must be adjusted for power dissipation and junction temperature; see power derating section. 4 between v cc (min) and v cc(uv) output switching continues to occur but device performance is not guaranteed. 5 power?on time consists of the time from when v cc rises above v cc (min) until the earliest output edge is possible. 6 independent of output polarity option (ht or lt). 7 output delay time is the duration from when a crossing of the magnetic signal switchpoint, b st , occurs to when the electrical output signal, v out , reaches 90% of v out (high). 8 reduced minimum air gap with n option due to potential for extra switching on first tooth due to magnetic overshoot larger than startup hysteresis, characteristic of the allegro 8x reference target. device functions properly in running mode down to 0.5 mm air gap. operating characteristics (continued) valid using allegro reference target 8x, and v cc and t a within specification; unless otherwise specified characteristic symbol test conditions min. typ. 1 max. unit 2 figure 3. output delay time and output fall time processed input signal, v proc output signal, v out t d t f 90% v out 10% v out v proc (high) b st v out (high) v proc (low) v out (low) time time figure 4. running mode switchpoint and internal hysteresis v proc(high) v proc(low) v proc magnetic gradient (b) 0 b st b hys b hys switchpoints target mechanical profile
single element, tooth detecting speed sensor ic ats601 5 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com power derating thermal characteristics may require derating at maximum conditions, see power derating section characteristic symbol test conditions* value unit package thermal resistance r ja single layer pcb, with copper limited to solder pads 126 oc/w single layer pcb, with copper limited to solder pads and 3.57 in. 2 (23.03 cm 2 ) copper area each side 84 oc/w *additional thermal information available on the allegro website power derating curve 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 20 40 60 80 100 120 140 160 180 temperature (c) maximum allowable v cc (v) v cc(max) v cc(min) (r ja = 84 c/w) (r ja = 126 c/w) 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 20 40 60 80 100 120 140 160 180 temperature (c) power dissipation, p d (m w) power dissipation versus ambient temperature r q ja = 126 oc/w r q ja = 84 oc/w
single element, tooth detecting speed sensor ic ats601 6 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com characteristic performance 3 4 5 6 7 8 9 10 -50 0 50 100 150 t f ( s) t a (c) output fall time versus ambient temperature r pu = 1k , c v pu = 5v, l = 4.7 nf 0 100 200 300 400 500 600 -50 0 50 100 150 v out(sat) (mv) t a (c) output on voltage versus ambient temperature 5 10 15 20 i out (ma) 4 5 6 7 8 9 10 -50 0 50 100 150 i cc (ma) t a (c) supply current versus ambient temperature 3.3 12 24 v cc (v)
single element, tooth detecting speed sensor ic ats601 7 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com 0 0.2 0.4 0.6 0.8 1 0 500 1000 1500 2000 2500 edge posi ? on () gear speed (rpm) rela ? ve timing accuracy versus speed rising electrical edge 25c, rela ve to 100 rpm gear speed 0.5 1 1.5 2 2.5 3 ag (mm) 0 0.2 0.4 0.6 0.8 1 0 500 1000 1500 2000 2500 edge posi ? on () gear speed (rpm) rela ? ve timing accuracy versus speed falling electrical edge 25c, rela ve to 100 rpm gear speed 0.5 1 1.5 2 2.5 3 ag (mm) -1 -0.5 0 0.5 1 00.511.522.533.5 edge posi ? on () air gap (mm) rela ? ve timing accuracy versus air gap rising mechanical edge, "m" switchpoint op on 1000 rpm, rela ve to 0.5 mm air gap -40 25 85 150 t a (c) -1 -0.5 0 0.5 1 00.511.522.533.5 edge posi ? on () air gap (mm) rela ? ve timing accuracy versus air gap falling mechanical edge, "m" switchpoint op on 1000 rpm, rela ve to 0.5 mm air gap -40 25 85 150 t a (c) -1 -0.5 0 0.5 1 00.511.522.533.5 edge posi ? on () air gap (mm) rela ? ve timing accuracy versus air gap rising mechanical edge, "u" switchpoint op on 1000 rpm, rela ve to 0.5 mm air gap -40 25 85 150 t a (c) -1 -0.5 0 0.5 1 0 0.5 1 1.5 2 2.5 3 3.5 edge posi ? on () air gap (mm) rela ? ve timing accuracy versus air gap falling mechanical edge, "u" switchpoint op on 1000 rpm, rela ve to 0.5 mm air gap -40 25 85 150 t a (c)
single element, tooth detecting speed sensor ic ats601 8 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com reference target 8x characteristic symbol test conditions typ. units symbol key outside diameter d o outside diameter of target 120 mm t t v ? d o h t f branded face of package air gap face width f breadth of tooth, with respect to branded face 6mm circular tooth length t length of tooth, with respect to branded face; measured at d o 23.6 mm circular valley length t v length of valley, with respect to branded face; measured at d o 23.6 mm tooth whole depth h t 5mm material crs 1018 ? ? reference target 8x of package branded face reference target characteristics
single element, tooth detecting speed sensor ic ats601 9 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com functional description sensing technology the ats601lsg contains a single-chip hall effect sensor ic, a 4-pin leadframe and a specially designed permanent magnet. the hall ic supports a chopper stabilized hall element that measures the magnetic gradient created by the passing of a ferromagnetic object. the difference in the magnetic field strength created by teeth and valleys allows the device to generate a digital output signal that is representative of the target features, independent of the direction of target rotation or rotational orientation of the sensor ic. the ats601lsg gear tooth sensor device contains a self-cali- brating hall effect ic that provides a hall element, a temperature compensated amplifier, and offset cancellation circuitry. the ic also contains a voltage regulator that provides supply noise rejection over the operating voltage range. the hall transducers and the electronics are integrated on the same silicon substrate by a proprietary bicmos process. changes in temperature do not greatly affect this device due to the stable amplifier design and the offset rejection circuitry. output polarity the polarity of the output is programmable to either be low opposite target teeth (lt option) or high opposite target teeth (ht option). see figure 5. start-up detection the ats601lsg always powers-on in the high output state, independent of the polarity option (ht or lt) selected. the output will transition to the low state at the first mechanical edge corresponding to a high-to-low output transition. see figure 6. threshold update the ats601 has two programmable options for the threshold update used to establish running mode switching levels. with single-tooth update (1 option) the switching threshold for a tooth target mechanical profile processed input signal, v proc 0 v+ target magnetic profile |b| valley tooth 0 output switch state ht option (following) v out = high v out = low on off on off on off on off output switch state lt option (inverting) v out = high v out = low on off on off on off on off figure 5. output polarity (when connected as shown in figure 1) figure 6. start-up behavior (when connected as shown in figure 1 ) power-on opposite middle of valley rising mechanical edge falling mechanical edge target motion ht option output lt option output power-on opposite rising mechanical edge ht option output lt option output power-on opposite middle of tooth ht option output lt option output power-on opposite falling mechanical edge ht option output lt option output
single element, tooth detecting speed sensor ic ats601 10 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com is established based on the measured peak value of the previous tooth. this option can be used with any number of teeth-targets, and is comparable to the continuous update mode used on many allegro sensor ics. with the four-tooth update (4 option), peak information from the last four teeth is stored in on-chip memory. switching thresholds for the upcoming tooth are established based on the stored infor- mation from four teeth earlier. when used with four-tooth targets, this is allows for optimized switchpoints based on the same tooth from the previous revolution of the target. the programmable threshold update results in improved output switching accuracy on targets with runout and tooth-to-tooth variation (including narrow valleys). with the four-tooth update option, during the first target rotation the device behaves the same as in single- tooth update while one rotation of target information is stored to memory. similarly, if a direction change or other sudden mag- netic signal change is detected, the device returns to single-tooth update mode and re-learns four target teeth before returning to four-tooth update mode. switchpoints the running mode switchpoints in the ats601lsg are estab- lished dynamically as a percentage of the amplitude of the signal, v proc . there are two switchpoint ( b st ) choices, selectable with the u or m options. the ats601lsg uses a single switch- ing threshold (operate and release point identical) with internal hysteresis. the internal running mode hysteresis ( b hys(rm) ) allows for high performance switching accuracy on both rising and falling edges while maintaining immunity to false switching on noise, vibra- tion, backlash, or other transient events. figure 7 demonstrates the function of this hysteresis when switching on an anomalous peak. power supply protection the ats601lsg contains an on-chip regulator and can operate over a wide range of supply voltage levels. for applications using an unregulated power supply, transient protection may be added externally. for applications using a regulated supply line, emi and rfi protection may still be required. contact allegro for information on emc specification compliance. when the supply voltage falls below the undervoltage lockout level, v cc(uv)fall , the device switches to the off (v out = high) state. the device remains in that state until the voltage level is restored to the v cc operating range. changes in the target mag- netic profile have no effect until voltage is restored. this prevents false signals caused by undervoltage conditions from propagating to the output of the sensor ic. time v proc (%) b st v proc (high) v proc (low) ?b hys(int) +b hys(int) switchpoint level on output state for pol bit = 0 off on off figure 7. switching on internal hysteresis
single element, tooth detecting speed sensor ic ats601 11 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com operating modes startup hysteresis mode after power-on, a minimum amount of peak-to-peak magnetic movement is required before the ats601 will begin generating output edges. this required signal movement threshold is referred to as the startup hysteresis. there are two programmable options for this startup hysteresis threshold. with narrow (n option) startup hysteresis, the device will switch to a farther air gap, but will have reduced immunity to magnetic overshoot, thus limiting its close air gap capability. with wide (w option) startup hyster- esis, the device will have a reduced maximum air gap capability, but improved magnetic overshoot immunity. after the magnetic signal exceeds the startup hysteresis value for the first time, the device will transition to calibration mode. calibration mode in calibration mode, the ats601 uses threshold based switching with continuous update. this ensures that all teeth and valleys are captured correctly, but provides slightly reduced accuracy relative to running mode. the device stays in calibration mode long enough to correctly capture enough peaks to fill the running mode threshold memory. this corresponds to three output edges with the single-tooth update (1 option) and nine edges with the four-tooth update (4 option). after calibration mode is complete, the device transitions to running mode. running mode in running mode the ats601 uses threshold based switching with internal hysteresis described previously, in the thresh- old update and switchpoints sections. the threshold update is intended to optimize output switching accuracy when used with common camshaft targets, including cases with runout and nar- row target valleys. stop mode the ats601 has an internal timer that begins counting on each output edge. if the timer reaches t sm before another output edge occurs, the device moves into stop mode. stop mode is the same as startup hysteresis mode, but with a hysteresis value determined as a percentage of the previously measured target amplitude. stop mode ensures no missed or extra output edges, even during situations with large temperature drifts and no target rotation. watchdog the ats601 has a peak detector continuously tracking the mag- netic signal. if a sudden large signal change causes the sensor ic output to stop switching but the peak detector continues to detect valid signal movement, the watchdog will be fired. in case of a watchdog event, the sensor ic performs a self-reset and returns to the initial startup hysteresis mode to regain output switching.
single element, tooth detecting speed sensor ic ats601 12 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com power derating power derating the device must be operated below the maximum junction tem- perature of the device, t j (max). under certain combinations of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the appli- cation. this section presents a procedure for correlating factors affecting operating t j . (thermal data is also available on the allegro microsystems website.) the package thermal resistance, r ? ja , is a figure of merit sum- marizing the ability of the application and the device to dissipate heat from the junction (die), through all paths to the ambient air. its primary component is the effective thermal conductivity, k, of the printed circuit board, including adjacent devices and traces. radiation from the die through the device case, r ? jc , is a relatively small component of r ? ja . ambient air temperature, t a , and air motion are significant external factors, damped by overmolding. the effect of varying power levels (power dissipation, p d ), can be estimated. the following formulas represent the fundamental relationships used to estimate t j , at p d . p d = v in i in (1) ? ???????????????????????? t = p d r ? ja (2) t j = t a + t (3) for example, given common conditions such as: t a = 25c, v cc = 12 v, i cc = 7 ma, and r ? ja = 126 c/w, then: p d = v cc i cc = 12 v 7 ma = 84 mw ?? t = p d r ? ja = 84 mw 126 c/w = 10.6c t j = t a + ? t = 25c + 10.6c = 35.6c a worst-case estimate, p d (max), represents the maximum allow- able power level (v cc (max), i cc (max)), without exceeding t j (max), at a selected r ? ja and t a . example : reliability for v cc at t a = 150c, package sg, using single layer pcb. observe the worst-case ratings for the device, specifically: r ? ja = 126c/w, t j (max) = 165c, v cc(absmax) = 24 v, and i cc = 10 ma. calculate the maximum allowable power level, p d (max). first, invert equation 3: ? t(max) = t j (max) ? t a = 165 c ? 150 c = 15 c this provides the allowable increase to t j resulting from internal power dissipation. then, invert equation 2: ???? p d (max) = ? t(max) r ? ja = 15c 126 c/w = 119 mw finally, invert equation 1 with respect to voltage: v cc(est) = p d (max) i cc = 119 mw 10 ma = 11.9 v the result indicates that, at t a , the application and device can dissipate adequate amounts of heat at voltages v cc(est) . compare v cc(est) to v cc (max). if v cc(est) v cc (max), then reli- able operation between v cc(est) and v cc (max) requires enhanced r ? ja . if v cc(est) v cc(max) , then operation between v cc(est) and v cc (max) is reliable under these conditions.
single element, tooth detecting speed sensor ic ats601 13 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com package sg, 4-pin sip 0.710.05 5.500.05 4.700.10 0.600.10 0.400.10 24.650.10 15.300.10 1.0 ref 0.71 0.10 0.71 0.10 1.60 0.10 1.270.10 5.50 0.10 8.000.05 5.800.05 1.700.10 24 3 1 a a d b for reference only, not for tooling use (reference dwg-9002) dimensions in millimeters a b c c d e f f dambar removal protrusion (16x) metallic protrusion, electrically connected to pin 4 and substrate (both sides) thermoplastic molded lead bar for alignment during shipment e hall element, not to scale active area depth, 0.43 mm branded face standard branding reference view = supplier emblem l = lot identifier n = last three numbers of device part number y = last two digits of year of manufacture w = week of manufacture lllllll yyww nnn branding scale and appearance at supplier discretion 0.38 +0.06 ?0.04
single element, tooth detecting speed sensor ic ats601 14 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615?0036 u.s.a. 1.508.853.5000; www.allegromicro.com copyright ?2013, allegro microsystems, llc allegro microsystems, llc reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions a s may be required to permit improvements in the per for mance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegro?s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of allegro?s product can reasonably be expected to cause bodily harm. the in for ma tion in clud ed herein is believed to be ac cu rate and reliable. how ev er, allegro microsystems, llc assumes n o re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. for the latest version of this document, visit our website: www.allegromicro.com

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