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description the A1160 is a unipolar, hall effect switch with an externally enabled diagnostic function. in normal operating mode, the A1160 functions as a standard, unipolar hall effect switch. the output transistor turns on (output signal switches low) in the presence of a sufficient magnetic field (>b op (max)). additionally, the output transistor of the A1160 switches off (output signal switches high) when the magnetic field is removed (< b rp (min)). the A1160 includes conductive coils in close proximity to the hall element. when the diagnostic feature is enabled, these coils are energized. the energized coils generate an internal magnetic field that can be sensed by the hall element. while in diagnostic mode, the output of the A1160 provides a square wave output, which confirms the ic is properly sensing the internally generated magnetic field. the diagnostic mode exercises the entire magnetic and electrical signal path internal to the ic, fully confirming functionality. therefore, use of the A1160 either eliminates the need for redundant sensors in safety critical applications or increases robustness in safety critical applications that require redundant sensors (drive-by-wire systems and so forth). the A1160 hall-effect sensor ic is extremely temperature- stable and stress-resistant, especially suited for operation A1160-ds features and benefits ? unipolar switchpoints ? externally enabled diagnostics feature ? diagnostics feature exercises the entire magnetic and electrical signal path within the ic ? resistant to physical stress ? superior temperature stability through advanced chopper stabilization techniques ? output short-circuit protection ? internal regulator enables operation from unregulated supplies ? reverse battery protection ? solid-state reliability ? small, surface mount package chopper-stabilized precision hall effect switch with advanced diagnostics package: 5-pin sot23w (suffix lh) functional block diagram A1160 continued on the next page? approximate footprint vcc vout to all subcircuits regulator dynamic offset cancellation signal recovery control current limit system diagnostics threshold normal diagnostic hall element v reg diag gnd amplifier
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 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 forward supply voltage v cc 30 v reverse supply voltage v rcc ?18 v forward diagnostic enable voltage v diag 5.5 v reverse diagnostic enable voltage v rdiag ?0.5 v output-off voltage v out 30 v continuous output current i out 25 ma reverse output current i rout ?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 diag 1, 3 diagnostics enable (use either pin 1 or pin 3) vcc 2 connects power supply to chip gnd 4 ground vout 5 output from circuit at temperature ranges up to 150c. superior high-temperature performance is made possible through advanced dynamic offset cancellation techniques, which reduce the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. this device includes on a single silicon chip a voltage regulator, hall-voltage generator, small-signal amplifier, chopper stabilization, schmitt trigger, and a open-drain output able to sink up to 25 ma. an on-board regulator permits operation with supply voltages of 3.8 to 24 v. the A1160 is provided in a 5-pin sot23w. the package is lead (pb) free, with 100% matte tin leadframe plating. description (continued) selection guide part number packing* A1160llhlx-t 10,000 pieces per 13-in. reel *contact allegro? for additional packing options. 1 5
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 3 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com operating characteristics valid across full operating voltage and ambient temperature ranges; unless otherwise specified characteristic symbol test conditions min. typ. 1 max. unit 2 electrical characteristics supply voltage v cc operating, t j < 165c 3.8 ? 24 v v cc required for diagnostic functionality 3.8 ? 24 v output leakage current i outoff v out = 24 v, b < b rp ??10 a output saturation voltage v out(sat) i out = 20 ma, b > b op ? 185 400 mv output current limit i om b > b op 30 ? 60 ma power-on time 3 t pn v cc > 3.8 v , b < b rp (min) ? 10 g , b > b op (max) + 10 g ??25 s chopping frequency f c ? 400 ? khz output rise time 3,4 t r r load = 820 , c l = 20 pf ? 0.2 2 s output fall time 3,4 t f r load = 820 , c l = 20 pf ? 0.1 2 s supply current 5 i cc(on) b < b rp , v cc = 12 v ? ? 5 ma i cc(off) b > b op , v cc = 12 v ? ? 5 ma i cc(diag) v cc = 12 v, diag = 1 ? 16 25 ma reverse battery current i rcc v rcc = ?18 v ? ? ?10 ma supply zener clamp voltage v zsup i cc = 8 ma, t a = 25c 30 ? ? v output zener voltage v zout i out = 3 ma, t a = 25c 28 ? ? v pwm carrier frequency f pwmout with diagnostic mode enabled ? 3 ? khz diagnostic characteristics duty cycle (diagnostic mode) 6 d fail diag = 1, device malfunction ? 0 or 100 ?% d pass diag = 1, device normal 40 50 60 % diag pin input resistance r diag internal pulldown resistor ? 1 ? m diag pin input low voltage threshold v il device in normal mode ? ? 0.6 v diag pin input high voltage threshold v ih device in diagnostic mode 1.5 ? 5.0 v diagnostic enable time t d time from v ih reaching 1.5 to 5.0 v until valid diagnostic output 1??ms diagnostic disable time t dis time from diag pin release (high to low transition) until valid normal sensor ic output ??25 s continued on the next page?
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 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 across full operating voltage and ambient temperature ranges; unless otherwise specified characteristic symbol test conditions min. typ. 1 max. unit 2 magnetic characteristics 7 operate point b op 115 180 245 g release point b rp 60 125 190 g hysteresis b hys b op ? b rp 30 55 80 g maximum external field in diagnostic mode 8 b ext(diag) 800 10,000 ? g drift detection threshold operate point drift b op(drift) 30 ? 420 g release point drift b rp(drift) 15 ? 325 g 1 typical data is at t a = 25c and v cc = 12 v and it is for design information only. 2 1 g (gauss) = 0.1 mt (millitesla). 3 power-on time, output rise time, and output fall time are ensured through device characterization and not final test. 4 c l = oscilloscope probe capacitance. 5 in diagnostic mode the supply current level is different from the normal mode operation current level. this is important when d etermining the power derating for diagnostic mode. 6 when the A1160 passes the diagnostic tests, it outputs a 50% duty cycle signal. any other output indicates the test failed. ple ase see the diagnostic mode of operation section for more information. 7 magnetic flux density, b, is indicated as a negative value for north-polarity magnetic fields, and as a positive value for sout h-polarity magnetic fields. 8 800 g is the maximum test capability due to practical equipment limitations. design simulations show that a 10,000 g external f ield will not adversely affect the A1160 in diagnostic mode when a 1% sensitivity mismatch between the hall elements in the ic is assumed.
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 5 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com 6 7 8 9 2 3 4 5 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 (oc) maximum allowable v cc (v) power derating curve v cc (max) normal mode (i cc (max) = 5 ma) diagnostic mode (i cc (max) = 25 ma) v cc (min) 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 diagnostic mode (i cc (max) = 25 ma) normal mode (i cc (max) = 5 ma) thermal characteristics may require derating at maximum conditions, see application information characteristic symbol test conditions* value unit package thermal resistance r ja on 4-layer pcb based on jedec standard 124 oc/w *additional thermal information available on the allegro website
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 6 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com characteristic performance 0 5 10 15 20 25 0 5 10 15 20 25 30 supply current, i cc(diag) (ma) supply voltage, v cc (v) i cc(diag) vs. v cc -40c 25c 150c t a 0 5 10 15 20 25 -50 0 50 100 150 200 supply current, i cc(diag) (ma) ambient temperature, t a (c) i cc(diag) vs. t a 3.8 v v cc 12 v 24 v 0 5 10 15 20 25 30 supply current, i cc(off) (ma) supply voltage, v cc (v) i cc(off) vs. v cc 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40c 25c 150c t a -50 0 50 100 150 200 supply current, i cc(off) (ma) ambient temperature, t a (c) i cc(off) vs. t a 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 3.8 v v cc 12 v 24 v 0 5 10 15 20 25 30 supply current, i cc(on) (ma) supply voltage, v cc (v) i cc(on) vs. v cc 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40c 25c 150c t a 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -50 0 50 100 150 200 supply current, i cc(on) (ma) ambient temperature, t a (c) i cc(on) vs. t a 3.8 v v cc 12 v 24 v 0 50 100 150 200 250 300 350 400 0 5 10 15 20 25 30 output satura ? on voltage, v out(sat) (v) supply voltage, v cc (v) v out(sat) vs. v cc -40c 25c 150c t a 0 50 100 150 200 250 300 350 400 -50 0 50 100 150 200 output satura ? on voltage, v out(sat) (v) ambient temperature, t a (c) v out(sat) vs. t a 3.8 v v cc 12 v 24 v
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 7 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com 40 42 44 46 48 50 52 54 56 58 60 0 5 10 15 20 25 30 normal diag duty cycle, d pass (%) supply voltage, v cc (v) d pass vs. v cc -40c 25c 150c t a 40 42 44 46 48 50 52 54 56 58 60 -50 0 50 100 150 200 normal diag duty cycle, d pass (%) ambient temperature, t a (c) d pass vs. t a 3.8 v v cc 12 v 24 v 0 1 2 3 4 5 6 0 5 10 15 20 25 30 pwm carrier frequency, f pwmout (khz) supply voltage, v cc (v) f pwmout vs. v cc -40c 25c 150c t a 0 1 2 3 4 5 6 -50 0 50 100 150 200 pwm carrier frequency, f pwmout (khz) ambient temperature, t a (c) f pwmout vs. t a 3.8 v v cc 12 v 24 v
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 8 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com 30 35 40 45 50 55 60 65 70 75 80 0 5 10 15 20 25 30 magne ? c hysteresis, b hys (g) supply voltage, v cc (v) b hys vs. v cc -40c 25c 150c t a 30 35 40 45 50 55 60 65 70 75 80 -50 0 50 100 150 200 magne ? c hysteresis, b hys (g) ambient temperature, t a (c) b hys vs. t a 3.8 v v cc 12 v 24 v 55 75 95 115 135 155 175 195 0 5 10 15 20 25 30 magne ? c release point, b rp (g) supply voltage, v cc (v) b rp vs. v cc -40c 25c 150c t a 55 75 95 115 135 155 175 195 -50 0 50 100 150 200 magne ? c release point, b rp (g) ambient temperature, t a (c) b rp vs. t a 3.8 v v cc 12 v 24 v 110 130 150 170 190 210 230 250 0 5 10 15 20 25 30 magne ? c operate point, b op (g) supply voltage, v cc (v) b op vs. v cc -40c 25c 150c t a 110 130 150 170 190 210 230 250 -50 0 50 100 150 200 magne ? c operate point, b op (g) ambient temperature, t a (c) b op vs. t a 3.8 v v cc 12 v 24 v
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 9 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com functional description figure 1. switching behavior of hall effect switches. on the horizontal axis, the b+ direction indicates increasing south polarity magnetic field strength, and the b? direction indicates decreasing south polarity field strength (including the case of increasing north polarity). figure 2. typical application circuit operation the output of the A1160 switches low (turns on) when a mag- netic field perpendicular to the hall element exceeds the oper- ate point threshold, b op . after turn-on, the output is capable of sinking 25 ma and the output voltage is v out(sat) . when the magnetic field is reduced below the release point, b rp , the output goes high (turns off). this is illustrated in figure 1. the difference in the magnetic operate and release points is the hysteresis, b hys , of the ic. this built-in hysteresis allows clean switching of the output, including when in the presence of exter- nal mechanical vibration and electrical noise. powering-on the ic in the hysteresis range (applied magnetic lower than b op but also higher than b rp ) results in output at the high state. the output will not switch until there is a valid transi- tion beyond b op or b rp . the correct output state is attained after the first excursion beyond b op or b rp . applications it is strongly recommended that an external bypass capacitor be connected between the supply and ground of the A1160 (in close proximity to the device) to reduce both external noise and noise generated by the chopper stabilization technique. as is shown in figure 2, a 0.1 f capacitor is typical. extensive applications information on magnets and hall-effect sensor ics is available on the allegro website, including the fol- lowing application notes: ? hall-effect ic applications guide , an27701 ? soldering methods for allegro?s products ? smt and through- hole , an26009 b op b rp b hys v cc v out v out(sat) switch to low switch to high b+ 0 v+ 0 c bypass vcc A1160 vout gnd v+ c l (optional) output diag from controller r l
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 10 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com diagnostic mode of operation the diagnostic mode is accessed by applying a voltage of v ih on the diagnostic enable pin (diag). the diagnostic mode uses an internally generated magnetic signal to exercise the signal path. this signal is compared to two reference signals in the schmitt trigger. if the diagnostic signal is between the two reference signals, the device is considered to be working within specification and a 50% pwm signal is set at the output pin (vout), as shown in figure 3. if the diagnostic signal is above the upper reference or below the lower reference, the output pwm is set at a fixed value that is either at nearly 0% or at nearly 100% duty cycle. the diagnostic mode of operation not only detects catastrophic failures but also identifies drifts in the magnetic switchpoints. if b op or b rp drift to values below or above the values stated in the drift detection threshold section of the operating characteris- tics table, the output pwm is set at a fixed value that is either at nearly 0% or at nearly 100% duty cycle. diag device ok duty = 50% diag t t t t device failure vout vout duty or 50% duty 50% figure 3. diagnostics functional diagram. when the A1160 passes the diagnostic test, a 50% duty cycle signal is sent out (left panel). in the event of a failure, the output will be forced either high or low (right panel). diagnostic mode is only active when the diag input pin is pulled high.
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 11 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com chopper stabilization technique when using hall-effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the hall element. this voltage is disproportionally small relative to the offset that can be produced at the output of the hall ic. this makes it difficult to process the signal while maintaining an accurate, reliable output across the specified operating tempera- ture and voltage ranges. chopper stabilization is a unique approach used to minimize hall offset on the chip. the patented allegro technique, namely dynamic quadrature offset cancellation, removes key sources of the output drift induced by thermal and mechanical stresses. this offset reduction technique is based on a signal modulation- demodulation process. the unwanted offset signal is separated from the magnetic field-induced signal in the frequency domain, through modulation. the subsequent demodulation acts as a modulation process for the offset, causing the magnetic field induced signal to recover its original spectrum at baseband, while the dc offset becomes a high-frequency signal. the magnetic sourced signal then can pass through a low-pass filter, while the modulated dc offset is suppressed. this configuration is illus- trated in figure 4. the chopper stabilization technique uses a 400 khz, high frequency clock. for demodulation process, a sample-and-hold technique is used, where the sampling is performed at twice the chopper frequency (800 khz). this high-frequency operation allows a greater sampling rate, which results in higher accuracy and faster signal-processing capability. this approach desensi- tizes the chip to the effects of thermal and mechanical stresses, and produces devices that have extremely stable quiescent hall output voltages and precise recoverability after temperature cycling. this technique is made possible through the use of a bicmos process, which allows the use of low-offset, low-noise amplifiers in combination with high-density logic integration and sample-and-hold circuits. the repeatability of magnetic field-induced switching is affected slightly by a chopper technique. however, the allegro high frequency chopping approach minimizes the affect of jitter and makes it imperceptible in most applications. applications that are more likely to be sensitive to such degradation are those requiring precise sensing of alternating magnetic fields; for example, speed sensing of ring-magnet targets. for such applications, allegro recommends its digital sensor ic families with lower sensitivity to jitter. for more information on those products, contact your allegro sales representative. figure 4. chopper stabilization circuit (dynamic quadrature offset cancellation) amp regulator clock/logic hall element sample and hold low-pass filter
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 12 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com package lh, 5-pin sot23w seating plane c 0.55 ref gauge plane seating plane 0.25 bsc 0.95 bsc 0.95 1.00 0.70 0.20 min 2.40 2 1 a active area depth, 0.28 mm ref b c c b reference land pattern layout all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances branding scale and appearance at supplier discretion a pcb layout reference view standard branding reference view 1 branded face n = last three digits of device part number nnn 2.90 +0.10 ?0.20 44 8x 12 ref 0.18 +0.02 ?0.05 0.05 +0.10 ?0.05 0.25 min 1.91 +0.19 ?0.06 2.98 +0.12 ?0.08 1.00 0.13 0.40 0.10 for reference only; not for tooling use dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown d hall element, not to scale, location application dependant d 5
chopper-stabilized precision hall effect switch with advanced diagnostics A1160 13 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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