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description the ats692lsh is an optimized hall-effect integrated circuit (ic) and rare earth pellet combination that provides a user- friendly solution for direction detection and true zero-speed, digital gear tooth sensing. the small package can be easily assembled and used in conjunction with a wide variety of gear tooth sensing applications. the ic employs patented algorithms for the special operational requirements of automotive transmission applications. the speed and direction of the target are communicated through a variable pulse width output protocol. the ats692 is particularly adept at handling vibration without sacrificing maximum air gap capability or creating any erroneous direction information. even higher angular vibration caused by engine cranking is completely rejected by the device. the advanced vibration detection algorithm systematically calibrates the sensor ic on the initial teeth of true target rotation and not on vibration, always guaranteeing an accurate signal in running mode. advanced signal processing and innovative algorithms make the ats692 an ideal solution for a wide range of speed and direction sensing needs. this device is available in a lead (pb) free 4-pin sip package with a 100% matte tin plated leadframe. ats692lsh1-ds, rev. 3 features and benefits ? two-wire, pulse width output protocol ? digital output representing target profile ? speed and direction information of target ? vibration tolerance ? small signal lockout for small amplitude vibration ? proprietary vibration detection algorithms for large amplitude vibration ? air gap independent switch points ? large operating air gap capability ? undervoltage lockout ? true zero-speed operation ? wide operating voltage range ? single chip sensing ic for high reliability ? robust test coverage capability with scan path and iddq measurement two-wire, differential, vibration resistant sensor ic with speed and direction output package: 4-pin sip (suffix sh) functional block diagram not to scale ats692lsh(rsnph) synchronous digital controller hall amp adc offset adjust offset adjust regulator (analog) vcc test multiplexed test signals gnd regulator (digital) hall amp adc agc agc filter filter
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 2 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com pin-out diagram absolute maximum ratings characteristic symbol notes rating unit supply voltage v cc refer to power derating section 28 v reverse supply voltage v rcc ?18 v 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 number name function 1 vcc supply voltage 2 test test pin: float * 3 test test pin: oat * 4 gnd ground *connection of test to vcc and/or gnd may cause undesired additional current consumption in the ic. selection guide part number packing* t w(nd) (nom) direction change function vibration immunity (running mode) ATS692LSHTN-RSNPH-T 800 pieces per reel 180 s t w(nd) until direction validated t target *contact allegro ? for additional packing options. configuration ats692lshtn -- t 100% matte tin leadframe plating vibration immunity / direction change: h ? high vibration immunity, with non-direction pulses calibration pulses: p ? pulses during calibration reverse pulse width: n ? narrow, 90 s number of pulses: s ? single, one pulse per tooth / valley rotation direction: r ? reverse, target movement forward direction from pin 4 to 1 allegro identifier and device type: ats692 operating temperature range: l package designation: sh instructions (packing): tn ? tape and reel, 800 pieces per 13-in. reel 24 3 1
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 3 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com operating characteristics valid at throughout full operating and temperature ranges; using reference target 60-0; unless otherwise specified characteristic symbol test conditions min. typ. 1 max. unit general electrical characteristics supply voltage 2 v cc operating, t j < t j (max) 4.0 ? 24 v under voltage lockout v cc(uv) v cc 0 5 v or 5 0 v ? 3.6 3.95 v reverse supply current 3 i rcc v cc = v rcc (max) ? ? ?10 ma supply zener clamp voltage v z(supply) i cc = i cc (max) + 3 ma, t a = 25oc 28 ? ? v supply current i cc(low) low-current state (running mode) 5.0 ? 8.0 ma i cc(high) high-current state (running mode) 12.0 ? 16.0 ma i cc(su)(low) startup current level (power-on mode) 5.0 ? 8.5 ma i cc(su)(high) high-current state (calibration) 12.0 ? 16.5 ma supply current ratio i cc(high) / i cc(low) measured as ratio of high current to low current 1.9 ? ? ? test pins zener clamp voltage 4 v z(test) ?6?v output stage output slew rate sr out r l = 100 , c l = 10 pf; i cc(high) i cc(low) , i cc(low) i cc(high) , 10% to 90% points 7.0 16 ? ma / s output pulse characteristics 5 pulse width (forward rotation) t w(fwd) 38 45 52 s pulse width (reverse rotation) t w(rev) 76 90 104 s pulse width (non-direction) t w(nd) 153 180 207 s general operating characteristics operate point b op % of peak-to-peak v proc ?69? % release point b rp % of peak-to-peak v proc ?31? % operating frequency (forward rotation) f fwd 0 ? 12 khz operating frequency (reverse rotation) 6 f rev 0?7khz operating frequency (non-direction pulses) 6 f nd 0?4khz dac characteristics allowable user-induced offset b offset magnitude valid for both differential magnetic channels ?60 ? 60 g performance characteristics air gap range ag using allegro reference target 60-0 0.5 ? 2.75 mm vibration immunity (startup) err vib(su) see figure 1 t target ? ? deg. vibration immunity (running mode) err vib see figure 1 t target ? ? deg. continued on the next page?
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 4 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com operating characteristics (continued) valid at throughout full operating and temperature ranges; using reference target 60-0; unless otherwise specified characteristic symbol test conditions min. typ. 1 max. unit input magnetic characteristics allowable differential sequential signal variation 7 b seq(n+1) / b seq(n) signal cycle-to-cycle variation (see figure 2) 0.6 ? ? ? calibration first direction output pulse 8 amount of target rotation (constant direction) following power-on until first electrical output pulse of either t w(fwd) or t w(rev) , see figure 1 ag 0.5 mm ag < 2.25 mm ? 2 t target < 3 t target deg. ag 2.25 mm ag 2.75 mm ? 2.5 t target < 4 t target deg. first direction pulse output following direction change n cd amount of target rotation (constant direction) following event until first electrical output pulse of either t w(fwd) or t w(rev) , see figure 1 1 t target 2 t target < 3 t target deg. first direction pulse output following running mode vibration amount of target rotation (constant direction) following event until first electrical output pulse of either t w(fwd) or t w(rev) , see figure 1 1 t target 2 t target < 3 t target deg. 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 maximum voltage must be adjusted for power dissipation and junction temperature; see power derating section. 3 negative current is defined as conventional current coming out of (sourced from) the specified device terminal. 4 sustained voltages beyond the clamp voltage may cause permanent damage to the ic. 5 load circuit is r l = 100 and c l = 10 pf. pulse duration measured at a threshold of (i cc(high) + i cc(low) ) / 2. 6 maximums of both operating frequency (reverse rotation) and operating frequency (non-direction pulses) are determined by satisf actory separation of output pulses: i cc(low) of t w(fwd) (min). if the customer can resolve lower low-state durations, maximum f rev and f nd may be increased. 7 if the minimum signal phase separation is not maintained during or after a signal variation event, output may be blanked or non -direction pulses may occur. a signal variation event during power-on may increase the quantity of edges required to get correct direction pulses. 8 power-on frequency 200 hz. higher power-on frequencies may require more input magnetic cycles until directional output pulses are achieved. v proc target t vproc v proc = the processed analog signal of the sinusoidal magnetic input (per channel) t target = period between successive sensed target mechanical edges of the same orientation (either both rising or both falling) t target valley tooth figure 1. definition of t target figure 2. differential signal variation b seq(n+1) b seq(n)
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 5 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com 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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 temperature (c) maximum allowable v cc (v) v cc (max) v cc (min) power derating curve 20 40 60 80 100 120 140 160 180 (r ja = 84 c/w) (r ja = 126 c/w) 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 20 40 60 80 100 120 140 160 180 temperature,t a (c) power dissipation, p d (m w) r q ja = 126 oc/w r q ja = 84 oc/w power dissipation versus ambient temperature
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 6 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com reference gear magnetic profile two tooth-to-valley transitions -500 -400 -300 -200 -100 0 100 200 300 400 500 gear rotation () differential b* (g) 024681012 0.50 (mm) air gap 0.50 mm ag 3.00 mm ag 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 1.5 1.0 2.0 2.5 0.5 3.0 800 700 600 500 400 300 200 100 0 reference gear magnetic gradient amplitude versus air gap reference target 60-0 air gap (mm) peak-to-peak differential b (g) reference target 60-0 (60 tooth target) characteristics symbol test conditions typ. units symbol key outside diameter d o outside diameter of target 120 mm face width f breadth of tooth, with respect to branded face 6mm angular tooth thickness t length of tooth, with respect to branded face 3 deg. angular valley thickness t v length of valley, with respect to branded face 3 deg. tooth whole depth h t 3mm material low carbon steel ? ? d o h t f air gap branded face of sensor t t v reference target 60-0 of sensor branded face
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 7 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 sensor ic contains a single-chip hall-effect circuit that supports a trio of hall elements. these elements are used in differential pairs to provide electrical signals containing informa- tion regarding edge position and direction of target rotation. the ats692 is intended for use with ferromagnetic targets. after proper power is applied to the sensor ic, it is capable of providing digital information that is representative of the mag- netic features of a rotating target. the waveform diagrams in figure 3 present the automatic translation of the target profiles, through their induced magnetic profiles, to the digital output signal of the sensor ic. direction detection the sensor ic compares the relative phase of its two differential channels to determine in which direction the target is moving. the relative switching order is used to determine the direction, which is communicated through the output protocol. data protocol description when a target passes in front of the device (opposite the branded face of the package case), the ats692 generates an output pulse for each tooth of the target. speed information is provided by the output pulse rate, while direction of target rotation is provided by the duration of the output pulses. the sensor ic can sense target movement in both the forward and reverse directions. forward rotation (see panel a in figure 2) when the target is rotating such that a tooth near the sensor ic passes from pin 4 to pin 1, this is referred to as forward rotation . forward rotation is indicated on the output by a t w(fwd) (45 s typical) pulse width. reverse rotation (see panel b in figure 2) when the target is rotating such that a tooth passes from pin 1 to pin 4, it is referred to as reverse rotation . reverse rotation is indicated on the output by pulse widths of t w(rev) (90 s typical). figure 2. target rotation figure 3. the magnetic profile reflects the features of the target, allowing the sensor ic to present an accurate digital output. pin 1 pin 4 rotating target (ferromagnetic) rotating target (ferromagnetic) branded face of package pin 1 pin 4 branded face of package i cc(high) i cc(low) b rp b op b rp b op device orientation to target (pin 1 side) (pin 4 side) ic a channel pole piece (concentrator) package case branded face (top view of package case) back-biasing rare-earth pellet a channel b channel a channel b channel ic e1 e2 e3 ic internal differential analog signals, v proc detected channel switching device output signal north pole south pole mechanical position (target moves past device pin 1 to pin 4) this tooth sensed earlier this tooth sensed later +b ta r g e t target magnetic profile (a) forward rotation (b) reverse rotation
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 8 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com timing as shown in figure 4, the pulse appears at the output slightly before the sensed magnetic edge traverses the package branded face. for targets in forward rotation, this shift, fwd, results in the pulse corresponding to the valley with the sensed mechanical edge, and for targets in reverse rotation, the shift, rev, results in the pulse corresponding to the tooth with the sensed edge. the sensed mechanical edge that stimulates output pulses is kept the same for both forward and reverse rotation by using only one channel to control output switching. direction validation following a direction change in running mode, output pulses have a width of t w(nd) until direction information is validated. an example of the waveforms is shown in figure 5. ? rev t w(rev) 90 s reverse rotation forward rotation output pulse (forward rotation) output pulse (reverse rotation) tooth valley ? fwd t w(fwd) 45 s t t figure 4. output protocol figure 5. example of direction change in running mode t target differential magnetic profile target rotation forward target rotation reverse t w (fwd) t w (nd) t w (rev) t w (fwd) i out tooth valley
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 9 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com start-up detection / calibration when power is applied to the ats692, the sensor ic inter- nally detects the profile of the target. the gain and offset of the detected signals are adjusted during the calibration period, normalizing the internal signal amplitude for the air gap range of the device. the automatic gain control (agc) feature ensures that opera- tional characteristics are isolated from the effects of installation air gap variation. automatic offset adjustment (aoa) is circuitry that compen- sates for the effects of chip, magnet, and installation offsets. this circuitry works with the agc during calibration to adjust v proc in the internal a-to-d range to allow for acquisition of signal peaks. aoa and agc function separately on the two differential signal channels. direction information is available after calibration is complete. output pulses of t w(nd) are supplied during calibration. figure 6 shows where the first output edges may occur for various starting target phases. vibration detection algorithms embedded in the ic digital controller detect the presence of target vibration through analysis of the two magnetic input channels. in the presence of vibration, output pulses of t w(nd) may occur or no pulses may occur, depending on the amplitude and phase of the vibration (figure 7). output pulses have a width of t w(nd) until direction information is validated on constant target rotation. t i cc target differential magnetic profile target rotation opposite valley opposite rising edge opposite tooth opposite falling edge device location at power-on t w (fwd) or t w (rev) t w (nd) t w (nd) t w (nd) t w (nd) t w (fwd) or t w (rev) t w (fwd) or t w (rev) t w (nd) t w (fwd) or t w (rev) t w (fwd) or t w (rev) t w (nd) t w (nd) t w (nd) t w (fwd) or t w (rev) t w (fwd) or t w (rev) tooth valley figure 6. start-up position effect on first device output switching figure 7. output functionality in the presence of running mode target vibration target differential magnetic profile normal target rotation vibration normal target rotation t w (nd) t w (nd) t w (nd) t w (nd) t w (nd) t w (fwd) [ or t w (rev) ] t w (fwd) [ or t w (rev) ] t w (fwd) t w (fwd) [ or t w (rev) ] [ or t w (rev) ] t w (fwd) t w (fwd) [ or t w (rev) ] [ or t w (rev) ] tooth valley
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 10 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com application information figure 8. typical application circuit 2 ats692 1 3 vcc gnd test test 4 0.01 m f 100 7 r l c l c bypass v cc power derating the device must be operated below the maximum junction temperature 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 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 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 = 6.5 ma, and r ? ja = 126 c/w, then: p d = v cc i cc = 12 v 6.5 ma = 78 mw ?? t = p d r ? ja = 78 mw 126 c/w = 9.8c t j = t a + ? t = 25c + 9.8c = 34.8c 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 sh, using a single-layer pcb. observe the worst-case ratings for the device, specifically: r ? ja = 126 c/w, t j (max) = 165c, v cc (max) = 24 v, and i cc (mean) = 13 ma. (note: at maximum target frequency, i cc(low) = 8 ma, i cc(high) = 16 ma, and maximum pulse widths, the result is a duty cycle of 62.4% and a worst case i cc (mean) of 13 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 (max) = 119 mw 13 ma = 9.2 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 reliable 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.
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 11 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com package sh, 4-pin sip 0.710.05 5.000.10 4.000.10 1.000.10 0.600.10 24.650.10 13.100.10 1.0 ref 0.71 0.10 0.71 0.10 1.60 0.10 1.270.10 5.50 0.10 5.500.05 8.000.05 5.800.05 1.700.10 24 3 1 a a b d for reference only, not for tooling use (reference dwg-9003) dimensions in millimeters a b c c d dambar removal protrusion (16x) metallic protrusion, electrically connected to pin 4 and substrate (both sides) thermoplastic molded lead bar for alignment during shipment active area depth 0.43 mm ref 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 e f f f e e2 e3 e1 1.75 1.75 hall elements (e1, e2, e3); not to scale
two-wire, differential, vibration resistant sensor ic with speed and direction output ats692lsh(rsnph) 12 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com revision history revision revision date description of revision rev. 3 august 27, 2013 upgrades to select graphics, t tsg copyright ?2010-2013, 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 life support devices or systems, if a failure of an allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. 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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