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description the ats616 gear-tooth sensor ic is a peak-detecting device that uses automatic gain control and an integrated capacitor to provide extremely accurate gear edge detection down to low operating speeds. each package consists of a high-tem- perature plastic shell that holds together a samarium-cobalt pellet, a pole piece, and a differential open-collector hall ic that has been optimized to the magnetic circuit. this small package can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes. the technology used for this circuit is hall-effect based. the chip incorporates a dual-element hall ic that switches in response to differential magnetic signals created by fer- romagnetic targets. the sophisticated processing circuitry contains an a-to-d converter that self-calibrates (normal- izes) the internal gain of the device to minimize the effect of air-gap variations. the patented peak-detecting filter circuit eliminates magnet and system offsets and has the ability to discriminate relatively fast changes such as those caused by tilt, gear wobble, and eccentricities. this easy-to-integrate solution provides first-tooth detection and stable operation to extremely low rpm. the ats616 can be used as a replace- ment for the ats612lsb, eliminating the external peak- holding capacitor needed by the ats612lsb. ats616lsg-ds, rev. 4 features and benefits ? self-calibrating for tight timing accuracy ? first-tooth detection ? immunity to air gap variation and system offsets ? eliminates effects of signature tooth offsets ? integrated capacitor provides analog peak and valley information ? extremely low timing-accuracy drift with temperature changes ? large air gap capability ? small, integrated package ? optimized magnetic circuit ? undervoltage lockout (uvlo) ? wide operating voltage range dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic package: 4-pin sip (suffix sg) functional block diagram not to scale ats616lsg continued on the next page? gnd vout vcc voltage regulator test hall amp reference generator gain current limit (recommended) hall amp track and hold track and hold uvlo power-on logic tooth and valley comparator
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 2 allegro microsystems, inc. 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 see power derating section 26.5 v reverse-supply voltage v rcc ?18 v output off voltage v outoff 24 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 number name 1 vcc 2 vout 3 test pin (tie to gnd) 4 gnd selection guide part number package packing* ATS616LSGTN-T 4-pin plastic sip 800 pieces per 13-in. reel *contact allegro ? for additional packing options the ats616 is ideal for use in systems that gather speed, posi- tion, and timing information using gear-tooth-based configura- tions. this device is particularly suited to those applications that require extremely accurate duty cycle control or accurate edge- detection, such as automotive camshaft sensing. theats616 is provided in a 4-pin sip that is pb (lead) free, with a 100% matte tin plated leadframe. description (continued) 24 3 1
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 3 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com operating characteristics over operating voltage and temperature range, unless otherwise noted characteristic symbol test condition min. typ. 1 max. units electrical characteristics supply voltage 2 v cc operating, t j < 165 ? c 3.5 ? 24 v power-on state pos v cc = 0 5 v ? high ? v undervoltage lockout threshold v cc(uv) v cc = 0 5 v; v cc = 5 0 v ? ? 3.5 v output on voltage v out(sat) i out = 20 ma ? 200 400 mv supply zener clamp voltage v zsupply i cc = 16 ma, t a = 25c 28 ? ? v output zener clamp voltage v zoutput i out = 3 ma, t a = 25c 30 ? ? v supply zener current i zsupply v s = 28 v ? ? 15 ma output zener current i zoutput v out = 30 v ? ? 3 ma output current limit i outm v out = 12 v 25 45 55 ma output leakage current i outoff v out = 24 v ? ? 15 a supply current i cc v cc > v cc(min) 3 6 12 ma power-on time t po v cc > 5 v ? 80 500 s output rise time 3 t r r load = 500 , c s = 10 pf ? 0.3 5.0 s output fall time 3 t f r load = 500 , c s = 10 pf ? 0.2 5.0 s performance characteristics operating air gap range ag operating within specification, target speed > 10 rpm 0.4 ? 2.5 mm operating magnetic flux density differential 4 b ag(p-p) operating within specification, target speed > 10 rpm 60 ? ? g operating frequency ? 10 ? 10 000 hz initial calibration cycle 5 n cal output edges before calibration is completed, at f sig < 100 hz 1 1 1 edge calibration mode disable n dis output falling edges for startup calibration to be complete 64 64 64 edge relative timing accuracy, sequential e target speed = 1000 rpm, b ag(p-p) > 100 g ? 0.5 0.75 ??? target speed = 1000 rpm, b ag(p-p) > 60 g ? ? 1.5 ??? allowable user induced differential offset 4 ? b app output switching only; may not meet data sheet specifica- tions ? ? 50 g 1 typical data is at v cc = 8 v and t a = 25c. 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 c s is the probe capacitance of the oscilloscope used to make the measurement. 4 10 g = 1 mt (millitesla), exactly. 5 non-uniform magnetic profiles may require additional edges before calibration is complete.
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 4 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com reference target 60+2 characteristics symbol test conditions typ. unit symbol key outside diameter d o outside diameter of target 120 mm t,t sig 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 3mm signature region cir- cular tooth length t sig length of signature tooth, with respect to branded face; measured at d o 15 mm circular valley length t v length of valley, with respect to branded face; measured at d o 3mm tooth whole depth h t 3mm material low carbon steel ? ? reference target signature region 60+2 of package branded face pin 4 pin 1 reference target (gear) information for the generation of adequate magnetic field levels, the fol- lowing recommendations should be followed in the design and specification of targets: ? 2 mm < tooth width, t < 4 mm ? valley width, t v > 2 mm ? valley depth, h t > 2 mm ? tooth thickness, f 3 mm ? target material must be low carbon steel although these parameters apply to targets of traditional geometry (radially oriented teeth with radial sensing, shown in figure 1), they also can be applied in applications using stamped targets (an aperture or rim gap punched out of the target mate- rial) and axial sensing. for stamped geometries with axial sens- ing, the valley depth, h t , is intrinsically infinite, so the criteria for tooth width, t, valley width, t v , tooth material thickness, f, and material specification need only be considered for reference. for example, f can now be < 3 mm. figure 1. configuration with radial-tooth reference target
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 5 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com characteristic data continued on the next page. v cc (v) supply current (off) versus supply voltage t a (c) i ccoff (ma) t a (c) supply current (off) versus ambient temperature i ccoff (ma) output voltage (on) versus ambient temperature i sink (ma) v out(sat) (mv) 20 v out (v) 10 supply current (on) versus ambient temperature i ccon (ma) output leakage current versus ambient temperature i outoff (a) 25 85 150 ?40 v cc (v) supply current (on) versus supply voltage i ccon (ma) v cc (v) 3.5 5.0 12 24 t a (c) t a (c) t a (c) v cc (v) t a (c) 25 85 150 ?40 v cc (v) 3.5 5.0 12 24 0 1 2 3 4 5 7 6 9 8 0 1 2 3 4 5 7 6 9 8 0 1 2 3 4 5 7 6 9 8 01020 15 52530 0 1 2 3 4 5 7 6 9 8 01020 15 52530 ?50 0 50 100 150 200 0 50 100 150 200 250 300 350 ?50 0 50 100 150 200 ?50 0 50 100 150 200 ?50 0 50 100 150 200 0 0.2 0.4 0.6 0.8 1.0 1.2
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 6 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com characteristic data (continued) relative timing accuracy versus air gap edge position () edge position () edge position () t a (c) ?40 0 25 85 125 150 t a (c) ?40 0 25 85 125 150 t a (c) ?40 0 25 85 125 150 signature tooth rising edge 1000 rpm ag (mm) edge position () ag (mm) ag (mm) relative timing accuracy versus air gap relative timing accuracy versus air gap sequential tooth falling edge 1000 rpm signature tooth falling edge 1000 rpm relative timing accuracy versus air gap sequential tooth rising edge 1000 rpm ag (mm) t a (c) ?40 0 25 85 125 150 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 0 3.0 2.5 2.0 1.5 1.0 0.5 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 0 3.0 2.5 2.0 1.5 1.0 0.5 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 0 3.0 2.5 2.0 1.5 1.0 0.5 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 0 3.0 2.5 2.0 1.5 1.0 0.5
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 7 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com characteristic data (continued) relative timing accuracy versus ambient temperature edge position () edge position () edge position () rpm rpm rpm signature tooth rising edge 0.5 mm t a (c) edge position () t a (c) t a (c) relative timing accuracy versus ambient temperature relative timing accuracy versus ambient temperature sequential tooth falling edge 0.5 mm sequential tooth rising edge 0.5 mm relative timing accuracy versus ambient temperature signature tooth falling edge 0.5 mm t a (c) rpm 10 100 500 1000 1500 2000 10 100 500 1000 1500 2000 10 100 500 1000 1500 2000 10 100 500 1000 1500 2000 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 ?50 200 150 100 50 0 ?50 200 150 100 50 0 ?50 200 150 100 50 0 ?50 200 150 100 50 0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 8 allegro microsystems, inc. 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 application information characteristic symbol test conditions* value units package thermal resistance r ja single-sided pcb with copper limited to solder pads 126 oc/w two-sided pcb with copper limited to solder pads and 3.57 in. 2 (23.03 cm 2 ) of copper area each side, connected to gnd pin 84 oc/w *additional information is available on the allegro web site. 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) t j(max) = 165oc; i cc = i cc(max) power derating curve (r ja = 126 oc/w) (r ja = 84 oc/w) v cc(min) v cc(max) 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) t j(max) = 165oc; v cc = v cc(max) ; i cc = i cc(max) maximum power dissipation, p d(max) (r ja = 126 oc/ w ) ( r ja = 84 oc/w )
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 9 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com assembly description. the ats616 is a hall ic/rare earth pellet configuration that is fully optimized to provide digi- tal response to gear tooth edges. this device is packaged in a molded miniature plastic body that has been optimized for size, ease of assembly, and manufacturability. high operating tem- perature materials are used in all aspects of construction. after proper power is applied to the component, the ic is capable of instantly providing digital information that is repre- sentative of the profile of a rotating gear. no additional optimi- zation or processing circuitry is required. this ease of use should reduce design time and incremental assembly costs for most applications. hall technology. the package contains a single-chip differential hall effect sensor ic, a samarium cobalt pellet, and a flat ferrous pole piece (figure 2). the hall ic consists of 2 hall elements (spaced 2.2 mm apart) located so as to measure the magnetic gradient created by the passing of a ferromagnetic object. the two elements measure the magnetic gradient and convert it to an analog voltage that is then processed in order to provide a digital output signal. the hall ic is self-calibrating and also possesses a tempera- ture compensated amplifier and offset cancellation circuitry. its voltage regulator provides supply noise rejection throughout the operating voltage range. changes in temperature do not greatly affect this device due to the stable amplifier design and the offset rejection circuitry. the hall transducers and signal processing electronics are integrated on the same silicon substrate, using a proprietary bicmos process. internal electronics. the processing circuit uses a patented peak detection scheme to eliminate magnet and system offsets. this technique allows dynamic coupling and filtering of offsets without the power-up and settling time disadvantages of classical high-pass filtering schemes. the peak signal of every tooth and valley is detected by the filter and is used to provide an instant reference for the operate and release point comparator. in this manner, the thresholds are adapted and referenced to individual signal peaks and valleys, providing immunity to zero line varia- tion from installation inaccuracies (tilt, rotation, and off-center placement), as well as for variations caused by target and shaft eccentricities. the peak detection concept also allows extremely low speed operation for small value filter capacitors. the ats616 also includes self-calibration circuitry that is engaged at power on. the signal amplitude is measured, and then the device gain is normalized. in this manner switchpoint drift versus air gap is minimized, and excellent timing accuracy can be achieved. the agc (automatic gain control) circuitry, in conjunction with a unique hysteresis circuit, also eliminates the effect of gear edge overshoot as well as increases the immunity to false switching caused by gear tooth anomalies at close air gaps. the functional description target (gear) back-biasing rare-earth pellet south pole north pole case (pin 1 side) (pin n >1 side) hall ic pole piece element pitch (concentrator) dual-element hall effect device hall element 1 hall element 2 figure 2. relative motion of the target is detected by the dual hall ele- ments mounted on the hall ic. figure 3. the peaks in the resulting differential signal are used to set the operate, b op , and release, b rp , switchpoints. device output v out b rp differential magnetic flux b+ b? 0 v cc v out(sat) b op b rp b op
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 10 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com agc circuit sets the gain of the device after power-on. up to a 0.25 mm air gap change can occur after calibration is complete without significant performance impact. superior performance. the ats616 has several advantages over conventional hall-effect devices. the signal-processing techniques used in the ats616 solve the catastrophic issues that affect the functionality of conventional digital gear-tooth sen- sors, such as the following: ? temperature drift. changes in temperature do not greatly affect this device due to the stable amplifier design and the offset rejection circuitry. ? timing accuracy variation due to air gap. the accuracy varia- tion caused by air gap changes is minimized by the self-cali- bration circuitry. a 2-to-3 improvement can be seen. ? dual edge detection. because this device switches based on the positive and negative peaks of the signal, dual edge detec- tion is guaranteed. ? tilted or off-center installation. traditional differential sensor ics can switch incorrectly due to baseline changes versus air gap caused by tilted or off-center installation. the peak detec- tor circuitry references the switchpoint from the peak and is immune to this failure mode. there may be a timing accuracy shift caused by this condition. ? large operating air gaps. large operating air gaps are achiev- able with this device due to the sensitive switchpoints after power-on (dependent on target dimensions, material, and speed). ? immunity to magnetic overshoot. the patented adjustable hysteresis circuit makes the ats616 immune to switching on magnetic overshoot within the specified air gap range. ? response to surface defects in the target. the gain-adjust circuitry reduces the effect of minor gear anomalies that would normally cause false switching. ? immunity to vibration and backlash. the gain-adjust circuitry keeps the hysteresis of the device roughly proportional to the peak-to-peak signal. this allows the device to have good im- munity to vibration even when operating at close air gaps. ? immunity to gear run out. the differential chip configuration eliminates the baseline variations caused by gear run out. differential vs. single-element design. the differential chip configuration is superior in most applications to the classical single-element design. the single-element configuration com- monly used (hall-effect element mounted on the face of a simple permanent magnet) requires the detection of a small signal (often <100 g) that is superimposed on a large back-biased field, often 1500 g to 3500 g. for most gear/target configurations, the back- biased field values change due to concentration effects, resulting in a varying baseline with air gap, valley widths, eccentricities, and vibration (figure 4). the differential configuration (figure 5) cancels the effects of the back-biased field and avoids many of the issues presented by the single hall element design. peak detecting vs. ac-coupled filters. high-pass filtering figure 4. affect of varying valley widths on single-element circuits. figure 4. affect of varying air gaps on differential circuits.
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 11 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com (normal ac coupling) is a commonly used technique for elimi- nating circuit offsets. however, ac coupling has errors at power- on because the filter circuit needs to hold the circuit zero value even though the circuit may power-on over a large signal. such filtering techniques can only perform properly after the filter has been allowed to settle, which typically takes longer than 1s. also, high-pass filter solutions cannot easily track rapidly chang- ing baselines, such as those caused by eccentricities. (the term baseline refers to a 0 g differential field, where each hall-effect element is subject to the same magnetic field strength; see figure 3.) in contrast, peak detecting designs switch at the change in slope of the differential signal, and so are baseline-independent both at power-on and while running. peak detecting vs. zero-crossing reference. the usual dif- ferential zero-crossing sensor ics are susceptible to false switch- ing due to off-center and tilted installations that result in a shift of the baseline that changes with air gap. the track-and-hold peak detection technique ignores baseline shifts versus air gaps and provides increased immunity to false switching. in addition, using track-and-hold peak detection techniques, increased air gap capabilities can be expected because peak detection utilizes the entire peak-to-peak signal range, as compared to zero-cross- ing detectors, which switch at half the peak-to-peak signal. power-on operation. the device powers-on in the off state (output voltage high), irrespective of the magnetic field condi- tion. the power-up time of the circuit is no greater than 500 s. the circuit is then ready to accurately detect the first target edge that results in a high-to-low transition of the device output. undervoltage lockout (uvlo). when the supply voltage, v cc , is below the minimum operating voltage, v cc(uv) , the device is off and stays off, irrespective of the state of the magnetic field. this prevents false signals, which may be caused by undervolt- age conditions (especially during power-up), from appearing at the output. output. the device output is an open-collector stage capable of sinking up to 20 ma. an external pull-up (resistor) must be sup- plied to a supply voltage of not more than 24 v. output polarity. the output of the unit will switch from low to high as the leading edge of a tooth passes the branded face of the package in the direction indicated in figure 6. this means that in such a configuration, the output voltage will be high when the package is facing a tooth. if the target rotation is in the oppo- site direction relative to the package, the output polarity will be opposite as well, with the unit switching from low to high as the leading edge passes the unit. of package rotating target branded face 1 4 figure 6. this left-to-right (pin 1 to pin 4) direction of target rotation results in a high output signal when a tooth of the target gear is nearest the branded face of the package. a right-to-left (pin 4 to pin 1) rotation inverts the output signal polarity. figure 7. the magnetic profile reflects the geometry of the target, allowing the device to present an accurate digital output r esponse. target mechanical profile target magnetic profile ic output electrical profile target motion from pin 1 to pin 4 ic output electrical profile target motion from pin 4 to pin 1 signature tooth b+ b in v+ v out v+ v out ic output switch state on off on off on off on off on off on off on off on off
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 12 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com 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 sup- plied power or improving the heat dissipation properties of the application. this section presents a procedure for correlating factors affecting operating t j . (thermal data is also available on the allegro microsystems web site.) 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 = 4 ma, and r ? ja = 140c/w, then: p d = v cc i cc = 12 v 4 ma = 48 mw ?? t = p d r ? ja = 48 mw 140c/w = 7c t j = t a + ? t = 25c + 7c = 32c 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 minimum-k pcb. observe the worst-case ratings for the device, specifically: r ? ja = 126c/w, t j(max) = 165c, v cc(max) = 24 v, and i cc(max) = 12 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 126c/w = 119 mw finally, invert equation 1 with respect to voltage: v cc(est) = p d(max) i cc(max) = 119 mw 12 ma = 9.92 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. this value applies only to the voltage drop across the ats616 chip. if a protective series diode or resistor is used, the effec- tive maximum supply voltage is increased. for example, when a standard diode with a 0.7 v drop is used: v cc(max) = 9.9 v + 0.7 v = 10.6 v
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 13 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com device evaluation: emc (electromagnetic compatibility) characterization only mechanical information test name* reference specification esd ? human body model aec-q100-002 esd ? machine model aec-q100-003 conducted transients iso 7637-1 direct rf injection iso 11452-7 bulk current injection iso 11452-4 tem cell iso 11452-3 *please contact allegro microsystems for emc performance component material description value package material thermoset epoxy maximum temperature 170c a leads copper 0.016 in. thick a temperature excursions of up to 225c for 2 minutes or less are permitted. b industry accepted soldering techniques are acceptable for this package as long as the indicated maximum temperature is not exce eded. additional soldering information is available on the allegro web site.
dynamic self-calibrating peak-detecting differential hall effect gear tooth sensor ic ats616lsg 14 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com package sg copyright ?2005-2009, allegro microsystems, inc. allegro microsystems, inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to per- mit 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, inc. assumes no 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. 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 e2 e1 hall elements (e1, e2), 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 2.20 for the latest version of this document, visit our website: www.allegromicro.com

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