A1468 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration FEATURES AND BENEFITS DESCRIPTION * * * * * The A1468 is an optimized Hall-effect sensing IC that provides a user-friendly solution for digital ring-magnet sensing, or when coupled with a magnet, ferromagnetic target sensing, in three-wire applications. The small device package can be easily assembled into applications for use in conjunction with a wide variety of target shapes and sizes. * * * * * * * 4.0 to 26.5 V supply operating range Minimum differential field 20 Gpk-pk Running mode calibration for continuous optimization Single chip IC for high reliability Precise duty cycle signal throughout operating temperature range Large operating air gaps Automatic Gain Control (AGC) for air-gap-independent switchpoints Automatic Offset Adjustment (AOA) for signal processing optimization True zero-speed operation Undervoltage lockout Reverse battery protection Scan and IDDQ for increased test coverage PACKAGE: 4-pin SIP (suffix K) The integrated circuit incorporates dual Hall-effect elements with a 2.2 mm spacing and signal processing that switches in response to differential magnetic signals created by ringmagnet poles. The circuitry contains a sophisticated digital circuit to reduce system offsets, to calibrate the gain for airgap-independent switchpoints, and to achieve true zero-speed operation. Signal optimization occurs at power-on through the combination of offset and gain adjust, and is maintained throughout the operating time with the use of a running-mode calibration. The running-mode calibration provides immunity to environmental effects such as micro-oscillations of the target or sudden air gap changes. The device is ideally suited to obtaining speed and duty cycle information in ring-magnet-based speed, position, and timing applications, such as in speedometers. The A1468 is available in a 4-pin SIP (suffix K). The package is lead (Pb) free, with 100% matte-tin leadframe plating. Not to scale VCC E1 Hall Amplifier Internal Regulator Gain E2 Automatic Offset Adjustment (AOA) Control AOA DAC Automatic Gain Control (AGC) AGC DAC Tracking DAC Peak Hold OUT + - Current Limit Test Signals TEST GND Functional Block Diagram A1468-DS, Rev. 5 MCO-0000609 February 22, 2019 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A1468 SELECTION GUIDE 1 Part Number Package Packing [1] Operating Ambient Temperature Range, TA (C) A1468LK-T 4-pin through hole SIP Bulk, 500 pieces per bag -40 to 150 Contact AllegroTM for additional packing options. SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Forward Supply Voltage VCC Reverse Supply Voltage VRCC Notes Refer to Power Derating Curves chart Rating Unit 38 V -18 V Output Current IOUT 30 mA Reverse Output Current IROUT -50 mA Reverse Output Voltage VROUT -0.5 V Output Off Voltage VOUT 28 V -40 to 150 C TJ(max) 165 C Tstg -65 to 170 C Operating Ambient Temperature TA Maximum Junction Temperature Storage Temperature L temperature range 1 2 3 4 Package K, 4-Pin SIP Pin-out Diagram Terminal List Table Number Name Function 1 VCC Supply voltage 2 VOUT Output 3 TEST Test pin, float 4 GND Ground Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 A1468 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration OPERATING CHARACTERISTICS: Valid throughout operating voltage and ambient temperature ranges, typical data applies at VCC = 12 V and TA = 25C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit [1] Operating, TJ 165C 4 - 26.5 V VCC = 0 VCC(min) + 1 V and VCC(min) + 1 V 0 V - - VCC(min) V 3.0 5.0 7.5 mA VOUT, connected as in Figure 6 - High - V VCC > VCC(min) - - 2.3 ms ELECTRICAL CHARACTERISTICS Supply Voltage [2] VCC Undervoltage Lockout VCC(uv) Supply Current ICC VCC > VCC(min) POWER-ON CHARACTERISTICS Power-On State POS Power-On Time [3] tPO TRANSIENT PROTECTION CHARACTERISTICS Supply Zener Clamp Voltage VZ(supply) ICC = ICC(max) + 3 mA, TA = 25 C 38 - - V Supply Zener Current IZ(supply) Vsupply = 38 V - - ICC(max) +3 mA mA Reverse Supply Current IRCC VRCC = -18 V, TJ < TJ(max) - - -1 Output Zener Clamp Voltage VZ(output) IOUT = 3 mA, TA = 25C 28 - - V Output Zener Current IZ(output) VOUT = 28 V - - 3 mA Output Current Limit IOUT(lim) 30 - 85 mA IOUT(sink) = 20 mA - 220 400 mV VOUT = 24 V, output off - - 10 A RPU = 1 k, VPU = 20 V, COUT = 10 pF - 2 - s 20 - 1200 G - 120 - mV 3 - 10 G - 120 - mV OUTPUT STAGE CHARACTERISTICS Output Saturation Voltage VOUT(sat) Output Leakage Current IOFF Output Fall Time tf PERFORMANCE CHARACTERISTICS Operating Magnetic Signal Range BDIFF Peak-to-peak of differential signal; operation within specification Operate Point [4] BOP See Figure 5 Release Point [4] BRP Operating Frequency fOP Analog Signal Bandwidth BW ncal Initial Calibration Cycle [5] See Figure 5 3 - 10 G 0 - 10 kHz Equivalent to f = -3 dB 20 - - kHz Output rising edges before calibration is completed, 0 offset, fOP 200 Hz - - 3 edge Output Duty Cycle Precision DOUT Using a pure sine magnetic signal, with fOP and BDIFF within specification - - 15 % Output Period Precision TOUT Using pure sine magnetic signal with BDIFF = 50 Gpk-pk and fOP = 1 kHz - 0.3 - % Output switching only - - 100 G Allowable User-Induced Differential Offset BDIFFEXT 11 G (gauss) = 0.1 mT (millitesla). voltage operation must not exceed maximum junction temperature. Refer to Power Derating Curves chart. 3 Time required to initialize device. Power-On Time includes the time required to complete the internal automatic offset adjust. The DAC is then ready for peak acquisition. 4 Values in G are based on device in maximum gain setting. 5 Non-uniform magnetic profiles may require additional output pulses before calibration is complete. 2 Maximum Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3 A1468 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information Characteristic Symbol Package Thermal Resistance Value Unit 177 C/W On single-layer PCB with copper limited to solder pads RJA thermal information available on the Allegro website. Maximum Allowable VCC (V) Power Derating Curves 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 VCC(max) 177C/W VCC(min) 20 40 60 80 100 120 140 160 180 Ambient Temperature, TA (C) Power Dissipation versus Ambient Temperature 900 800 Power Dissipation, PD (mW) 1 Additional Test Conditions [1] 700 600 500 177 C/W 400 300 200 100 0 20 40 60 80 100 120 140 160 180 Ambient Temperature, TA (C) Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 4 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A1468 CHARACTERISTIC PERFORMANCE Supply Current (Output On) versus Temperature 7 6 Supply Current, Icc (mA) 6 Supply Current, Icc (mA) Supply Current (Output On) versus Supply Voltage 7 5 4 Vcc (V) 3 4 2 12 1 5 4 TA (C) 3 -40 25 2 85 1 26.5 150 0 0 -50 -25 0 25 50 75 100 125 0 150 5 Ambient Temperature,( TA C) 25 30 6 Supply Current, Icc (mA) Supply Current, Icc (mA) 20 Supply Current (Output Off) versus Supply Voltage 7 6 5 4 Vcc (V) 3 4 2 12 1 -50 -25 0 25 50 75 100 125 5 4 TA (C) 3 -40 25 2 85 1 26.5 0 150 0 150 0 5 Ambient Temperature, TA (C) Output Saturation Voltage versus Temperature 500 IOUT(mA) 450 10 15 20 25 400 350 300 250 200 150 100 50 0 -50 -25 0 25 50 75 100 Ambient Temperature, TA (C) 10 15 20 25 30 Supply Voltage, Vcc (V) Output Saturation Voltage, VOUT(sat) (V) Output Saturation Voltage, VOUT(sat) (V) 15 Supply Voltage, Vcc (V) Supply Current (Output Off) versus Temperature 7 10 125 150 Output Saturation Voltage versus Output Current 500 TA (C) 450 400 -40 350 25 300 85 250 150 200 150 100 50 0 0 5 10 15 20 25 30 Output Current, I OUT(mA) Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 5 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A1468 Output Fall Time versus Temperature Output Fall Time, t f (s) 3 2.5 2 1.5 1 IOUT (mA) 10 0.5 20 0 -25 0 25 50 75 100 Ambient Temperature, TA (C) 125 150 Output Duty Cycle Precision versus Temperature at Air Gap* = 3mm 16 fOP (Hz) 14 20 500 1000 2000 12 10 8 6 4 2 0 -50 -25 0 25 50 75 100 Output Duty Cycle Precision versus Frequency at Air Gap* = 3mm 16 Output Duty Cycle Precision, DOUT (%) Output Duty Cycle Precision, DOUT (%) -50 125 14 TA (C) 12 -40 10 25 8 85 6 150 4 2 0 150 0 Output Duty Cycle Precision versus Air Gap* at TA = 25C 16 14 fOP (Hz) 12 20 500 1000 2000 10 8 6 4 2 0 0 1 2 Air Gap (mm) 3 4 Output Duty Cycle Precision, DOUT (%) Output Duty Cycle Precision, DOUT (%) Ambient Temperature, TA (C) 500 1000 1500 Operating Frequency, fOP (Hz) 2000 Output Duty Cycle Precision versus Frequency at TA = 25C 16 Air Gap*(mm) 14 0.5 1.0 1.5 2.0 2.5 3.0 3.5 12 10 8 6 4 2 0 0 500 1000 1500 2000 Operating Frequency, fOP (Hz) *Air gap defined as the distance between the front face of the A1468 package and the Allegro Reference Target 60-0 ring magnet Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 6 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A1468 CHARACTERISTIC ALLOWABLE AIR GAP MOVEMENT Allowable Air Gap Movement from TEAGCAL* 2.0 TEAGOUT (mm) 1.5 1.0 0.5 0 -0.5 -1.0 0 0.5 1.0 1.5 2.0 TEAGIN (mm) 2.5 3.0 3.5 *Data based on study performed using Allegro Reference Target 60-0 ring magnet, and applicable to ring magnet targets with similar magnetic characteristics. The colored area in the chart above shows the region of allowable air gap movement within which the device will continue output switching. The output duty cycle is wholly dependent on the target's magnetic signature across the air gap range of movement, and may not always be within specification throughout the entire operating region (to AG(OPmax)). panel a) within the range defined by an increase of TEAGOUT = 0.35 mm (shown in panel b), and a decrease of TEAGIN = 0.65 mm (shown in panel c). This case is plotted with an "x" in the chart above. Please note that after extreme cases of decrease in air gap, the device may not switch when the air gap resumes the nominal value. For example, if TEAGIN = 2.75 mm, the chart shows TEAGOUT = -0.5 mm, meaning that the device can now switch only in the air gap range of 0.5 to 2.75 mm inward from the nominal air gap. The axis parameters for the chart are defined in the drawings below. As an example, assume the case where the air gap is allowed to vary from the nominal installed air gap (TEAGCAL , (a) (b) A1468 (c) TEAGCAL TEAG OUT A1468 TEAG IN A1468 Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 7 A1468 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration FUNCTIONAL DESCRIPTION Sensing Technology The single-chip differential Hall-effect sensor IC possesses two Hall elements, which sense the magnetic profile of the ring magnet simultaneously, but at different points (spaced at a 2.2 mm pitch), generating a differential internal analog voltage, VPROC , that is processed for precise switching of the digital output signal. The Hall IC is self-calibrating and also possesses a temperaturecompensated amplifier and offset compensation 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 compensation circuitry. The Hall transducers and signal processing electronics are integrated on the same silicon substrate, using a proprietary BiCMOS process. Target (Ring Magnet) S S N N Element Pitch Hall Element 2 Hall Element 1 Hall IC (Pin 4 Side) (Pin 1 Side) Figure 1: Relative Motion of the Target The relative motion of the target is detected by the dual Hall elements mounted on the Hall IC. Target Profiling An operating device is capable of providing digital information that is representative of the magnetic features on a rotating target. The waveform diagram shown in Figure 3 presents the automatic translation of the magnetic profile to the digital output signal of the device. Output Polarity Figure 3 shows the output polarity for the orientation of target and device shown in Figure 2. The target direction of rotation shown is: perpendicular to the leads, across the face of the device, from the pin 1 side to the pin 4 side. This results in the device output switching from low to high as the leading edge of a north magnetic pole passes the device face. In this configuration, the device output voltage switches to its high polarity when a north pole is the target feature nearest to the device. If the direction of rotation is reversed, then the output polarity inverts. Branded Face of K Package Rotating Target S N S N S SN Pin 1 N Pin 4 Figure 2: Target Rotation This left-to-right (pin 1 to pin 4) direction of target rotation results in a high output signal when a target north pole is nearest the face of the device (see Figure 3). A right-to-left (pin 4 to pin 1) rotation inverts the output signal polarity. Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 8 A1468 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration Figure 3: Output Profile of a Ring Magnet Target for the Polarity Indicated in Figure 2 Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 9 A1468 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration Automatic Gain Control (AGC) This feature allows the device to operate with an optimal internal electrical signal, regardless of the differential signal amplitude (within the BDIFF and BDIFFEXT specifications). During calibration, the device determines the peak-to-peak amplitude of the signal generated by the target. The gain of the device is then automatically adjusted. Figure 4 illustrates the effect of this feature. During running mode, the AGC continues to monitor the system amplitude, reducing the gain if necessary; see the Device Operation section for more details. Target Ring Magnet Digital Peak Detection A digital DAC tracks the internal analog voltage signal, VPROC, and is used for holding the peak value of the internal analog signal. In the example shown in Figure 5, the DAC would first track up with the signal and hold the upper peak's value. When VPROC drops below this peak value by BOP , the device hysteresis, the output would switch and the DAC would begin tracking the signal downward toward the negative VPROC peak. After the DAC acquires the negative peak, the output will again switch states when VPROC is greater than the peak by the value BRP . At this point, the DAC tracks up again and the cycle repeats. The digital tracking of the differential analog signal allows the device to achieve true zero-speed operation. S N S Internal Differential Analog Signal Response, without AGC AGLarge AGSmall V+ Automatic Offset Adjust (AOA) The AOA is patented circuitry that automatically compensates for the effects of chip, magnet, and installation offsets. This circuitry is continuously active, including both during calibration mode and running mode, compensating for offset drift. Continuous operation also allows it to compensate for offsets induced by temperature variations over time. N V+ Internal Differential Analog Signal Response, with AGC AGSmall AGLarge Figure 4: Automatic Gain Control (AGC) The AGC function corrects for variances in the air gap. Differences in the air gap affect the magnetic gradient, but AGC prevents that from affecting device performance, as shown in the lowest panel. V+ Internal Differential Analog Signal, VPROC 0 BOP BOP BRP BRP V- VCC Device Output, VOUT VOUT(sat) Figure 5: Differential Signal Peaks The peaks in the resulting differential signal are used to set the operate (BOP ) and release (BRP ) switchpoints. Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 10 A1468 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration Power Supply Protection The device contains an on-chip regulator and can operate throughout a wide VCC range. For devices that must be operated from an unregulated power supply, transient protection must be added externally. For applications using a regulated line, EMI/ RFI protection may still be required. Contact Allegro for information on the circuitry required for compliance with various EMC specifications. Refer to Figure 6 for an example of a basic application circuit. Undervoltage Lockout When the supply voltage falls below the undervoltage lockout voltage, VCC(uv) , the device enters Reset, where the output state returns to the Power-On State (POS) until sufficient VCC is supplied. track the VPROC signal. After power-on, there are conditions that could induce a change in the output state. Such an event could be caused by thermal transients, but would require a static applied magnetic field, proper signal polarity, and particular direction and magnitude of internal signal drift. INITIAL OFFSET ADJUST The device initially cancels the effects of chip, magnet, and installation offsets. After offsets have been cancelled, the device is ready to provide the first output switch. The period of time required for both Power-On and Initial Offset Adjust is defined as the Power-On Time. CALIBRATION MODE Assembly Description This device is integrally molded into a plastic body that has been optimized for size, ease of assembly, and manufacturability. High operating temperature materials are used in all aspects of construction. Device Operation Each operating mode is described in detail below. The calibration mode allows the device to automatically select the proper signal gain and continue to adjust for offsets. The AGC is active, and selects the optimal signal gain based on the amplitude of the VPROC signal. Following each adjustment to the AGC DAC, the Offset DAC is also adjusted to ensure the internal analog signal is properly centered. During this mode, the tracking DAC is active and output switching occurs, but the duty cycle is not guaranteed to be within specification. RUNNING MODE POWER-ON When power (VCC > VCC(min)) is applied to the device, a short period of time is required to power the various portions of the IC. During this period, the A1468 powers-on in the high-voltage state, VOUT(high), and the digital tracking DAC gets ready to After the Initial Calibration period, CI, establishes a signal gain, the device moves to running mode. During running mode, the device tracks the input signal and gives an output edge for every peak of the signal. AOA remains active to compensate for any offset drift over time. Vsupply RPU 1 k VCC CBYP 0.1 F A1468 TEST OUT GND VOUT COUT Figure 6: Typical Application Diagram Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 11 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A1468 The A1468 incorporates an algorithm for adjusting the signal gain during running mode. This algorithm is designed to optimize the VPROC signal amplitude in instances where the magnetic signal "seen" during the calibration period is not representative of the amplitude of the magnetic signal for the installed device air gap 1 2 (see Figure 7). Note that in this mode, the gain can be reduced but not increased, so this algorithm applies only to instances in which the magnetic signal amplitude during running is higher than that during calibration. 3 4 5 BOP Internal Differential Signal, VPROC BOP BRP BRP Device Electrical Output, VOUT Figure 7: Operation of Running Mode Gain Adjust * Position1. The device is initially powered-on. Self-calibration occurs. * Position 2. Small amplitude oscillation of the target sends an erroneously small differential signal to the device. The amplitude of VPROC is greater than the switching hysteresis (BOP and BRP), and the device output switches. * Position 3. The calibration period completes on the third rising output edge, and the device enters running mode. * Position 4. True target rotation occurs and the correct magnetic signal is generated for the installation air gap. The established signal gain is too large for the target rotational magnetic signal at the given air gap. * Position 5. Running mode calibration corrects the signal gain to an optimal level for the installation air gap. Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 12 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A1468 Power Derating The device must be operated below the maximum junction temperature of the device, TJ(max). Under certain combinations of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the application. This section presents a procedure for correlating factors affecting operating TJ. (Thermal data is also available on the Allegro MicroSystems website.) The Package Thermal Resistance, RJA, is a figure of merit summarizing 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, RJC, is relatively small component of RJA. Ambient air temperature, TA, and air motion are significant external factors, damped by overmolding. The effect of varying power levels (Power Dissipation, PD), can be estimated. The following formulas represent the fundamental relationships used to estimate TJ, at PD. PD = VIN x IIN T = PD x RJA TJ = TA + T For example, given common conditions such as: TA= 25C, VCC = 12 V, ICC = 5 mA, and RJA = 177 C/W, then: A worst-case estimate, PD(max), represents the maximum allowable power level (VCC(max) , ICC(max)), without exceeding TJ(max), at a selected RJA and TA. Example: Reliability for VCC at TA = 150C, package K, using minimum-K PCB. Observe the worst-case ratings for the device, specifically: RJA = 177C/W, TJ(max)= 165C, VCC(max) = 26.5 V, and ICC(max) = 7.5 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: Tmax = TJ(max) - TA = 165C - 150 C = 15 C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = Tmax / RJA = 15C / 177C/W = 85 mW Finally, invert equation 1 with respect to voltage: (1) VCC(est) = PD(max) /ICC(max) = 85 mW / 7.5 mA = 11.3 V (2) The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages VCC(est). (3) Compare VCC(est) to VCC(max). If VCC(est) VCC(max), then reliable operation between VCC(est) and VCC(max) requires enhanced RJA. If VCC(est) VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions. PD = VCC x ICC = 12 V x 5 mA = 60 mW T = PD x RJA = 60 mW x 177C/W = 10.6C TJ = TA + T = 25C + 10.6C = 35.6C Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 13 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A1468 PACKAGE OUTLINE DIAGRAM For Reference Only - Not for Tooling Use (Reference DWG-9010) Dimensions in millimeters - NOT TO SCALE Dimensions exclusive of mold flash, gate burs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown B 45 5.21 NOM E 2.20 1.55 NOM E 1.50 D Mold Ejector Pin Indent 1.32 E 3.43 NOM E1 45 Branded Face E2 1 2 3 4 2.16 MAX 0.84 REF NNNN YYWW A 0.38 NOM 0.41 NOM 1 1.27 NOM C Standard Branding Reference View N = Device part number Y = Last two digits of year of manufacture W = Week of manufacture 14.73 NOM A Dambar removal protrusion (8x) B Gate and tie burr area C Branding scale and appearance at supplier discretion D Active Area Depth, 0.42 mm E Hall elements (E1 and E2), not to scale Figure 8: Package K, 4-Pin SIP Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 14 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A1468 REVISION HISTORY Number Date 1 April 14, 2014 Revised Power Derating Curve. Description 2 July 11, 2014 Revised Device Operation description. 3 July 11, 2016 Revised Forward Supply Voltage in Absolute Maximum Rating table. 4 November 16, 2016 5 February 22, 2019 Corrected Figure 8: Package K, 4-Pin SIP. Minor editorial updates Copyright (c)2019, Allegro MicroSystems, LLC Allegro MicroSystems, LLC 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. 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 information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC 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. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 15