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? differential hall-effect sensor measures ferrous targets with inherent stray field immunity ? solidspeed digital architecture? provides robust, adaptive performance with advanced algorithms that provide vibration immunity over the full target pitch ? integrated solution includes a back-bias magnet and capacitor in a single overmolded package ? iso 26262:2011 asil b with integrated diagnostics and certified safety design process (pending assessment) ? two-wire current source output pulse-width protocol supporting speed, direction, and asil error reporting ? eeprom enables factory traceability the ats19520 is an advanced hall-effect integrated circuit (ic) that uses an integrated back-bias magnet to measure the speed and direction of rotating ferrous targets. the package features an integrated capacitor for electromagnetic compatibility (emc). the ats19520 employs intelligent algorithms that allow stable operation during vibration and highly dynamic air gap environments common to transmission applications. in addition, the differential sensing offers inherent rejection of interfering common-mode magnetic fields. the ats19520 was developed in accordance with iso 26262:2011 as a hardware safety element out of context with asil b capability (pending assessment) for use in automotive safety-related systems when integrated and used in the manner prescribed in the applicable safety manual and datasheet. the ats19520 is provided in a 3-pin sip package (suffix sn) that is lead (pb) free, with tin leadframe plating. the sn package includes an ic, magnet, and capacitor integrated into a single overmold, with an additional molded lead-stabilizing bar for robust shipping and ease of assembly. ats19520-ds, rev. 2 mco-0000588 vibration-tolerant hall-effect transmission speed and direction gear tooth sensor ic package: 3-pin sip (suffix sn) functional block diagram not to scale ats19520 + - + - oscillator adc digital controller output current generator esd vcc gnd eeprom front end amplification analog -to-digital and signal conditioning + - regulator diagnostics adc features and benefits description april 5, 2019 2 -
2 - calibr aon mode non-direcon pulses o Cb lank ed, no output during calib ra
on y Cp ulses allowed during calib ra
on running mode non -d irecon pulses b Cb lank ed, no output during running mode p Cp ulses allowed during running mode vibr aon i mmunity /d irecon change l Cl ow vib ra
on immunity with immediat e dire c
on -change detec
on h Ch igh vib ra
on immunity pulse widths ( typical) i Ci ntermediate, f or wa rd = 6 0 s , re verse = 120 s , no n- di re c
on = 3 0 s n Cn arro w, f or wa rd = 4 5 s , re verse = 90 s, n on -direc
on = 180 s w Cw id e, f or wa rd = 4 5 s , re verse = 180 s , no n- di re c
on = 3 60 s number of pulses s Cs ingl e, o ne pulse per tooth -v alley pair ro taon dire con f Cf or wa rd , pin 1 to p in 3 r Cf or wa rd , pin 3 to p in 1 pa cking type pa ckage designaon oper ang t empe ra tu re range allegro iden?er and device type con?gu ra
on op
ons at s1 9520 l sn tn - exte nded sudden air gap opons k Ct imed r esets enable d u Cf eatu re not enabled in te rnal capaci to r b C1 0 nf capac
to r l C2 2 nf capacito r asil p ro toco l: a Ca sil protocol enabled blank Ca sil protocol disabled - selection guide* part number packing ats19520lsnbtn-rswhpyu tape and reel, 13-in. reel, 800 pieces per reel * not all combinations are available. contact allegro sales for availability and pricing of custom programming options. vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
3 package sn, 3-pin sip pinout diagram terminal list table number name function 1 vcc supply voltage 2 vcc supply voltage 3 gnd ground 12 3 internal discrete capacitor ratings characteristic symbol notes rating units nominal capacitance c supply connected between vcc and gnd; refer to figure 1 b 10 nf l 22 nf absolute maximum ratings characteristic symbol notes rating units supply voltage v cc refer to power derating section 28 v reverse supply voltage v rcc C18 v operating ambient temperature t a range l C40 to 150 oc maximum junction temperature t j(max) 165 oc storage temperature t stg C65 to 170 oc specifications pinout diagram and terminal list v cc gn d r l c supply ic v out = i cc r l c l ats19520 1 3 v cc figure 1 : typical application circuit vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
4 characteristic symbol test conditions min. typ. [1] max. unit general supply voltage [2] v cc operating, t j < t j(max) , voltage across pin 1 and pin 3; does not include voltage across r l 4 C 24 v undervoltage lockout v cc(uv) v cc 0 v 5 v or 5 v 0 v C 3.6 3.95 v reverse supply current [3] i rcc v cc = v rcc(max) C10 C C ma supply current i cc(low) low-current state 5.9 7 8 ma i cc(high) high-current state 12 14 16 ma i cc(high) / i cc(low) ratio of high current to low current (isothermal) 1.9 C C C asil safety current i reset refer to figure 7 1.5 C 3.9 ma protection circuits supply zener clamp voltage v zsupply i cc = 19 ma, t a = 25c 28 C C v power-on characteristics power-on state pos v cc > v cc(min) , as connected in figure 1 i cc(low) ma power-on time [4] t po time from v cc > v cc(min) , until device has entered calibration C C 1 ms output pulse characteristics, pulse protocol [5] output rise time t r voltage measured at pin 2 in figure 1, r l = 100 , c l = 10 pf, measured between 10% and 90% of signal snl variant 0 4.5 8 s snb variant 0 2 4 s output fall time t r voltage measured at pin 3 in figure 1, r l = 100 , c l = 10 pf, measured between 10% and 90% of signal snl variant 0 4.5 8 s snb variant 0 2 4 s pulse width, asil warning t w(asilwarn) refer to figure 7 63 C 121 s pulse width, asil critical t w(asilcrit) refer to figure 7 4 C 8 ms operating characteristics : valid throughout full operating and temperature ranges, unless otherwise specifed continued on next page... vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
5 characteristic symbol test conditions min. typ. [1] max. unit intermediate pulse width option (part number - xxixxxx ) threshold to enter high-speed mode f high t cycle frequency increasing 0.935 1.1 1.265 khz threshold to exit high-speed mode f low t cycle frequency decreasing 0.85 1 1.15 khz pulse width, forward rotation t w(fwd) t cycle frequency < f low 51 60 69 s pulse width, reverse rotation t w(rev) t cycle frequency < f low 102 120 138 s pulse width, high-speed t w(hs) t cycle frequency > f high 25 30 35 s pulse width, non-direction t w(nd) 25 30 35 s operating frequency, forward rotation [6][7][8] f fwd 0 C 12 khz operating frequency, reverse rotation [6][7][8] f rev 0 C 12 khz operating frequency, non-direction pulses [6][8] f nd 0 C 12 khz narrow pulse width option (part number - xxnxxxx ) 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 operating frequency, forward rotation [6][8] f fwd 0 C 12 khz operating frequency, reverse rotation [6][8] f rev 0 C 7 khz operating frequency, non-direction pulses [6][8] f nd 0 C 4 khz wide pulse width option (part number - xxwxxxx ) pulse width, forward rotation t w(fwd) 38 45 52 s pulse width, reverse rotation t w(rev) 153 180 207 s pulse width, non-direction t w(nd) 306 360 414 s operating frequency, forward rotation [6][8] f fwd 0 C 12 khz operating frequency, reverse rotation [6][8] f rev 0 C 4 khz operating frequency, non-direction pulses [6][8] f nd 0 C 2.2 khz operating characteristics (continued) : valid throughout full operating temperature ranges, unless otherwise specifed continued on next page... vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
6 operating characteristics (continued) : valid throughout full operating temperature ranges, unless otherwise specifed characteristic symbol test conditions min. typ. [1] max. unit input characteristics and performance air gap range using allegro 60-0 reference target; tested at 1000 rpm [9] 0.5 C 2.8 mm user-induced offset differential magnitude valid for both differential magnetic channels. C400 C 400 g operate point b op % of peak-to-peak ic-processed signal C 70 C % release point b rp % of peak-to-peak ic-processed signal C 30 C % switch point separation b diff(sp-sep) required amount of amplitude separation between channels at each b op and b rp occurrence; refer to figure 4 20 C C %b diff(pk-pk) allowable differential sequential signal variation b seq(n+1) / b seq(n) signal cycle-to-cycle variation (refer to figure 2) 0.7 C 1.3 C b seq(n+i) / b seq(n) overall signal variation (refer to figure 2) 0.1 C C C initial calibration t cal periods after t po completed and first valid speed and direction output. constant direction of rotation. refer to figure 3 for definition of t cycle . C C 4 t cycle C vibration immunity (startup) high vibration (-xxxhxxxx variant) 1 t cycle C C C low vibration (-xxxlxxxx variant) 1 t cycle C C C vibration immunity (running mode) high vibration (-xxxhxxxx variant) 1 t cycle C C C low vibration (-xxxlxxxx variant) 0.12 t cycle C C C timer period timed reset intervals with no output pulses (-xxxxxxxk variant) C 0.5 C s thermal characteristics package thermal resistance [10] r ja single-layer pcb with copper limited to solder pads C 150 C c/w [1] typical values are at t a = 25c and v cc = 12 v. performance may vary for individual units, within the specifed maximum and minimum limits. [2] maximum voltage must be adjusted for power dissipation and junction temperature; see representative for power derating discussions. [3] negative current is defned as conventional current coming out of (sourced from) the specifed device terminal. [4] output transients prior to t po should be ignored. [5] timing from start of rising output transition. measured pulse width will vary on load circuit confgurations and thresholds. pulse width measured at threshold of (i cc(high) + i cc(low) ) / 2 for non-asil pulses and (i reset + i cc(low) ) / 2 for asil pulses. [6] maximum operating frequency is determined by satisfactory separation of output pulses. if shorter low-state durations can be resolved, the maximum f rev and f nd may be higher. does not appy to -xxixxxx variant or f fwd . [7] direction information is not available when frequency > f high for the intermediate pulse width option. [8] zero-speed is not met when the xxxxxxk-variant is implemented due to the inclusion of a timed reset. [9] speed-related efects on maximum air gap are highly dependent upon specifc target geometry . consult with allegro feld applications engineering for aid with assess - ment of target geometries. [10] additional thermal information is available on the allegro website. vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
7 b seq(n) b seq(n + 1) b, i 2 seq(n+i) to oth va lley ferrous ta rget b diff t cycle ta rget cycle; the amount of rotation that moves one tooth and valley across the sensor. t cycle = the differential magnetic flux density sensed by the sensor. b diff = b diff(brp) b diff(bop) b diff(pk-pk) b diff(pk-pk) b diff(sp) b diff(sp) b diff(sp) b= diff(sp-sep) (b ) op (b ) rp t cycle figure 2 : diferential signal variation figure 3: defnition of t cycle figure 4: defnition of switch point separation vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
8 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 6 mm circular tooth length t length of tooth, with respect to branded face 3 deg. circular valley width t v length of valley, with respect to branded face 3 deg. tooth whole depth h t 3 mm material low carbon steel C C f h t d o t v t air gap branded face of package reference target 60-0 branded face of sensor vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
9 functional description sensing technology the sensor ic contains a single-chip hall-effect circuit that sup - ports a trio of hall elements. these are used in differential pairs to provide electrical signals containing information regarding edge position and direction of target rotation. the ats19520 is intended for use with ferrous 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 5 present the automatic translation of the target profiles, through their induced magnetic profiles, to the digital output signal of the sensor ic. pin 3 pin 1 rotating target (forward rotation) branded face of package pin 3 pin 1 rotating target (reverse rotation) branded face of package panel a panel b direction detection the sensor ic compares the relative phase of its two differential channels to determine 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 ats19520 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 as shown in panel a in figure 6 , when the target is rotating such that a tooth near the sensor ic C of -fxxxxxx variant C passes from pin 1 to pin 3, this is referred to as forward rotation. this direction is opposite for the -rxxxxxx variant. forward rotation is indicated by output pulse widths of t w(fwd) . reverse rotation as shown in panel b in figure 6 , when the target is rotating such that a tooth passes from pin 3 to pin 1, it is referred to as reverse rotation for the -fxxxxxx variant. reverse rotation is indicated by output pulse widths of t w(rev) . figure 5 : magnetic profle the magnetic profile reflects the features of the target, allowing the sensor ic to present an accurate digital output. figure 6 : target rotation (f variant shown) vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
10 asil protocol the -xxxxxxx-a variant contains diagnostic circuitry that will continuously monitor occurrences of failure defects within the ic. refer to figure 7 for the output protocol of the asil safe state after an internal defect has been detected. error protocol will result from faults which cause incorrect signal transmission (i.e., too few or too many output pulses). note: if a fault exists continuously, the device will attempt recovery indefinitely. refer to the ats19520 safety manual for additional details on the asil safe state output protocol. figure 7 : output protocol (asil safe state) tooth valley target normal operation i cc(high) i cc(low) fault protocol i cc(high) i cc(low) fault t w(asilwarn) or t w(asilcrit) i reset t po vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
11 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 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 = 14 ma, and r ja = 150c/w, then: p d = v cc i cc = 12 v 14 ma = 168 mw t = p d r ja = 168 mw 150c/w = 25.2c t j = t a + t = 25c + 25.2c = 50.2c 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 sn, using a single-layer pcb. observe the worst-case ratings for the device, specifically: r ja = 150c/w, t j(max) = 165c, v cc(max) = 24 v , and i cc(avg) = 14.6 ma. i cc(avg) is computed using i cc(low)(max) and i cc(high) (max) , with a duty cycle of 83% computed from t w(rev)(max) on- time at 4 khz maximum operating frequency. calculate the maximum allowable power level, p d(max) . first, invert equation 3: t max = t j(max) C t a = 165c C 150c = 15c 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 150c/w = 100 mw finally, invert equation 1 with respect to voltage: ? v cc(est) = p d(max) i cc(avg) = 100 mw 14.6 ma = 6.8 v the result indicates that, at t a , the application and device cannot dissipate adequate amounts of heat at operating voltages above 6.8 v at 150c. 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. vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
12 package outline drawing for reference only ?n ot for tooling use (reference dwg-0000429, rev. 4) dimensions in millimeters ? not to scale dimensions exclusive of mold ?ash, gate burrs, and dambar protrusions exact case and lead con?guration at supplier discretion within limits shown dambar removal protrusion (12) tie bars (8) molded lead bar for preventing damage to leads during shipment hall elements (f1, f2, f3); not to scale active area depth, 0.40 0.05 mm branding scale and appearance at supplier discretion a b c d e f notes: 0.90 ref 2 3 1 g 2 7 2 10 45 45 a branded face 3.03 0.10 2.54 0.10 5.80 ref 1.10 ref 5.78 0.10 7.65 0.10 15.58 0.10 23.36 ref 19.24 ref 1.60 0.10 5.00 0.10 1.15 0.05 e c 7.00 0.10 1.00 0.10 0.25 0.05 plating included 2.00 0.10 0.90 ref 9.20 ref 0.60 ref 0.30 ref 2.73 ref 0.49 ref 1.18 ref 4 ?1.00 ref ejector pin ?2.00 ref ejector pin f gate location g b b 0.51 ref 2.375 1.50 1.50 f1 f3 f f f2 f lines 1, 2, 3, 4: up to 10 characters, centered line 1: logo a line 2: characters 5, 6, 7, 8, 9, 10, 11 of assembly lot number line 3: 3 character prefix, 5 digit part number, package variant line 4: 4 digit date code standard branding reference vi ew lot number axxnnnnnx date code d 2 3 1 4.03 ref ?8.00 0.10 2 10 2 7 1.00 ref 2.89 f figure 8 : package sn, 3-pin sip vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com
13 revision history number date description C january 31, 2019 initial release 1 march 29, 2019 updated features and benefits (page 1), selection guide (page 2), and asil protocol section (page 10). 2 april 5, 2019 updated asil status (page 1) and figure references (page 4). for the latest version of this document, visit our website: www.allegromicro.com copyright 2019, allegro microsystems. allegro microsystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegros 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 allegros product can reasonably be expected to cause bodily harm. the information included herein is believed to be accurate and reliable. however, allegro microsystems assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. copies of this document are considered uncontrolled documents. vibration-tolerant hall effect transmission speed and direction gear tooth sensor ic ats19520 allegro microsystems 955 perimeter road manchester, nh 03103-3353 u.s.a. www.allegromicro.com

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