A17301

A17301 ALLEGRO

Document overview

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Technical content

PACKAGE: The A17301 integrates a single IC and EMC components into a small SIP package, providing a robust and cost-effective solution for digital ring-magnet sensing or ferromagnetic target sensing when coupled with a back-biasing magnet. The device can be used in two-wheeled vehicle applications where a wide variety of target shapes and sizes are used. The integrated circuit incorporates dual Hall-effect elements with 2.2 mm spacing and signal processing that switches in response to differential magnetic signals created by ring- magnet poles. The circuitry contains a sophisticated digital circuit to reduce system offsets, to calibrate the gain for air- gap-independent switchpoints, and to achieve true zero-speed operation. Running mode recalibration provides immunity to environmental effects such as micro-oscillations of the target or sudden air gap changes. Use of a digital peak detector for output switching control ensures the input signal is never lost, regardless of the amount of signal shift between output edges. The A17301 is ideally suited to obtain speed and duty cycle information for position and timing applications, such as in speedometers/tachometers. The A17301 is available in a 3-pin SIP (suffix UC). The package is lead (Pb) free, with 100% matte-tin leadframe plating. A17301-DS MCO-0000513

• Immune to common external magnetic disturbance
• Operates down to 20 Gpk-pk differential input field for large air gaps or small back-biasing fields
• Running mode recalibration after start-up vibration ensures immunity to possible target anomalies
• Accurate duty cycle on output signal throughout operating temperature range and air gaps
• Integrated capacitors for EMC performance Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration Figure 1: Functional Block Diagram Not to scale A17301 Tracking DAC AOA DAC OUT GND VCC Internal Regulator Automatic Offset Adjustment (AOA) Control Peak Hold Current Limit AGC DACAutomatic Gain Control (AGC) Hall AmplifierE1 Gain∑ FEATURES AND BENEFITS DESCRIPTION October 16, 2018 3-pin SIP (suffix UC)

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Unit Forward Supply Voltage VCC Refer to Power Derating Curves chart 38 V Reverse Supply Voltage VRCC –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 Operating Ambient Temperature TA P temperature range –40 to 160 °C Maximum Junction Temperature TJ(max) 175 °C Storage Temperature Tstg –65 to 170 °C SELECTION GUIDE Part Number Package Packing [1] Operating Ambient Temperature Range, TA (°C) A17301PUCFTN 3-pin SIP 13-inch tape and reel, 4000 pieces per reel –40 to 160 [1] Contact Allegro™ for additional packing options. Pinout Diagram TERMINAL LIST Number Name Description

1 VCC Supply voltage

2 GND Ground

3 OUT Open drain output

Name Reference Nominal Value Bypass Capacitor CBYP 100 nF Output Capacitor COUT 1.8 nF INTERNAL COMPONENT LIST VSUPPLY* RPULLUP VCC OUT

2 GND

*As shown, VSUPPLY = VPULLUP; device allows for independent VPULLUP voltage if desired. Figure 2: Typical Application Circuit

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Characteristics Symbol Test Conditions Min. Typ. Max. Unit [1]

ELECTRICAL CHARACTERISTICS

Supply Voltage [2] VCC Operating, TJ ≤ TJ(max) 4 – 26.5 V Undervoltage Lockout VCC(uv) VCC = 0 → VCC(min) + 1 V and VCC(min) + 1 V → 0 V – – 4 V Supply Current ICC VCC > VCC(min) 3 5 7.5 mA POWER-ON CHARACTERISTICS Power-On State POS VOUT, connected as in Figure 2 – High – V Power-On Time [3] tPO VCC > VCC(min) – – 2.3 ms TRANSIENT PROTECTION CHARACTERISTICS Supply Zener Clamp Voltage VZ(supply) ICC = ICC(max) + 3 mA, TA = 25 °C 38 – – V Supply Zener Current IZ(supply) VCC = 38 V – – ICC(max) + 3 mA Reverse Supply Current IRCC VRCC = –18 V, TJ < TJ(max) –1 – – mA Output Zener Clamp Voltage VZ(output) IOUT = 3 mA, TA = 25°C 28 – – V Output Zener Current IZ(output) VOUT = 28 V – – 3 mA Output Current Limit IOUT(lim) 30 – 85 mA OUTPUT STAGE CHARACTERISTICS Output Saturation Voltage VOUT(sat) IOUT(sink) = 20 mA – 220 400 mV Output Leakage Current IOFF VOUT = 24 V, output off – – 10 µA Output Fall Time tf 90% → 10%, VPULLUP = 12 V, RPULLUP = 1 kΩ – 1.7 – µs PERFORMANCE CHARACTERISTICS Operating Magnetic Signal Range BDIFF Peak-to-peak of differential signal; operation within specification 20 – 1200 G Operate Point [4] BOP See Figure 8 – 120 – mV 3 – 10 G Release Point [4] BRP See Figure 8 – 120 – mV 3 – 10 G Operating Frequency fOP 0 – 10 kHz Analog Signal Bandwidth BW Equivalent to f = –3 dB 20 – – kHz Initial Calibration Cycle [5] ncal Output rising edges before calibration is completed, 0 G offset, f OP ≤ 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 B DIFF = 50 Gpk-pk and fOP = 1 kHz – 0.3 – % Allowable User-Induced Differential Offset BDIFFEXT Output switching only – – ±100 G [1] 1 G (gauss) = 0.1 mT (millitesla). [2] Maximum 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. OPERATING CHARACTERISTICS: Valid throughout operating voltage and ambient temperature ranges, typical data applies at VCC = 12 V and TA = 25°C, unless otherwise specified

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com THERMAL CHARACTERISTICS : May require derating at maximum conditions; see application information Characteristic Symbol Test Conditions [1] Value Unit Package Thermal Resistance RθJA On single-layer PCB with copper limited to solder pads 270 °C/W [1] Additional thermal information available on the Allegro website. 100 200 300 400 500 600 700 800 20 40 60 80 100 120 140 160 180 Power Dissipation, PD (mW) Temperature (°C) Power Dissipation versus Ambient Temperature 1-layer PCB, Package UC (RθJA = 270°C/W) 20 40 60 80 100 120 140 160 180 Maximum Allowable VCC (V) Temperature (°C) Power Derating Curve VCC(max) VCC(min) 1-layer PCB, Package UC (RθJA = 270°C/W)

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CHARACTERISTIC PERFORMANCE -50 0 50 100 150 200 Supply Current, I CC (mA) Ambient Temperature ( °C) Supply Current Over Temperature and VCC Output On (VOUT = Low) VCC (V) -50 0 50 100 150 200 Supply Current, I CC (mA) Ambient Temperature ( °C) Supply Current Over Temperature and VCC Output Off (VOUT = High) VCC (V) 100 150 200 250 300 350 400 450 500 -50 0 50 100 150 200 Saturation Voltage (mV) Ambient Temperature ( °C) Output Saturation Voltage Over Temperature IOUT (mA) 0.5 1.5 2.5 -50 0 50 100 150 200 Fall Time (µs) Ambient Temperature ( °C) Output Fall Time Over Temperature

12 V, 1 kΩ

VPULLUP, RPULLUP 0 5 10 15 20 25 30 Supply Current, I CC (mA) Supply Voltage (V CC) Supply Current Over VCC and Temperature Output On (VOUT = Low) -40 160 TA (°C) 0 5 10 15 20 25 30 Supply Current, I CC (mA) Supply Voltage (V CC) Supply Current Over VCC and Temperature Output Off (VOUT = High) -40 160 TA (°C)

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com *Air gap defined as the distance between the front face of the A17301 package to the ring magnet target. CHARACTERISTIC PERFORMANCE (continued) 0 0.5 1 1.5 2 2.5 Duty Cycle Error (%) Opearating Frequency (kHz) Duty Cycle Error Over Operating Frequency At 1 mm Air G ap* -40 160 TA (°C) -50 0 50 100 150 200 Duty Cycle Error (%) Ambient Temperature ( °C) Duty Cycle Error Over Temperature At 1 mm Air G ap* 0.5 1.5 fOP (kHz) 0 0.5 1 1.5 2 2.5 3 3.5 Duty Cycle Error (%) Air Gap* (mm) Duty Cycle Error Over A ir Gap At 1 kHz Operating Frequency -40 160 TA (°C) -50 0 50 100 150 200 Duty Cycle Error (%) Ambient Temperature ( °C) Duty Cycle Error Over Temperature At 1 kHz Operating Frequency 0.5 1.5 2.5 Air G ap* (mm)

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ∆TEAGIN (mm) ∆TEAGOUT (mm) Allowable Air Gap Movement from TEAGCAL* 2.0 1.5 1.0 0.5 -0.5 -1.0 The colored area in the chart above shows the region of allow- able 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 move- ment and may not always be within specification throughout the entire operating region (to AG (OPmax)). The axis parameters for the chart are defined in Figure 3. As an example, assume the case where the air gap is allowed to vary from the nominal installed air gap (TEAG CAL , Figure 3, panel a) within the range defined by an increase of ΔTEAGOUT = 0.35 mm (Figure 3, panel b), and a decrease of ΔTEAGIN = 0.65 mm (Figure 3, panel c). This case is plotted with an “x” in the chart above. 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 ΔTEAG IN = 2.75 mm, the chart shows ΔTEAGOUT = –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. TEAGIN TEAGOUT (a) TEAGCAL (b) (c) *Data based on study performed using Allegro Reference ring magnet target, and applicable to ring magnet targets with similar magnetic characteristics. CHARACTERISTIC ALLOWABLE AIR GAP MOVEMENT Figure 3

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com FUNCTIONAL DESCRIPTION Sensing Technology The single-chip differential Hall-effect sensor IC possesses two Hall elements that 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, as shown in Figure 4. The Hall IC is self-calibrating and also possesses a temperature- compensated 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 process- ing electronics are integrated on the same silicon substrate, using a proprietary BiCMOS process. 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 6 presents the automatic translation of the magnetic profile to the digital output signal of the device. Output Polarity Figure 6 shows the output polarity for the orientation of target and device shown in Figure 5. 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 3 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. Target (Ring Magnet) NSS N (Pin 1 Side)(Pin 3 Side) Hall IC Element Pitch Hall Element 1Hall Element 2 Figure 4: Relative Motion of the Target The relative motion of the target is detected by the dual Hall elements mounted on the Hall IC. Figure 5: Target Rotation This left-to-right (pin 1 to pin 3) direction of target rotation results in a high output signal when a target north pole is nearest the face of the device (see Figure 6). A right-to-left (pin 3 to pin 1) rotation inverts the output signal polarity. Pin 1 Pin 3 N NN S NS S S Pin 1 Pin 3 Rotatin (Ring magnet or ferromagnetic) gT arget Branded Face of UC Package Forward Rotation N NN S NS S S Rotatin (Ring magnet or ferromagnetic) g Target Reverse Rotation Branded Face of UC Package

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com SN S SN S SN S SN S Left Left Left Left Right Right Right Right pin 1 pin 1 pin 1 pin 1 pin 3 pin 3 pin 3 pin 3 VPROC = LEFT-RIGHT VPROC = LEFT-RIGHT VPROC = LEFT-RIGHT VPROC = LEFT-RIGHT OUTPUT OUTPUT OUTPUT OUTPUT TIME TIME TIME TIME Figure 6: Output Profile of a Ring Magnet Target from Pin 1 to Pin 3 (as indicated in Figure 5)

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 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 B DIFF and BDIFFEXT specifications). During calibra- tion, the device determines the peak-to-peak amplitude of the signal generated by the target. The gain of the device is then auto- matically adjusted. Figure 7 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 Opera- tion section for more details. 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. Digital Peak Detection A 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 8, the DAC would first track up with the signal and hold the upper peak’s value. When V PROC drops below this peak value by BOP , the device hysteresis, the output would switch and the DAC would begin tracking the sig- nal downward toward the negative VPROC peak. After the DAC acquires the negative peak, the output will again switch states when V PROC 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. Figure 7: 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. N NS S Target Ring Magnet AG Small AGLarge AGSmall AGLarge Internal Differential Analog Signal Response, with AGC Internal Differential Analog Signal Response, without AGC Internal Differential Analog Signal, V PROC Device Output, V OUT VCC BOP BOP BRP BRP VOUT(sat) Figure 8: Differential Signal Peaks The peaks in the resulting differential signal are used to set the operate (BOP ) and release (BRP ) switchpoints.

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 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 infor- mation on the circuitry required for compliance with various EMC specifications. Refer to Figure 2 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. 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 con- struction. Device Operation Each operating mode is described in detail below. 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 A17301 powers-on in the high-voltage state, VOUT = VPULLUP , and the digital tracking DAC gets ready to 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 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 V PROC 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 switch- ing occurs, but the duty cycle is not guaranteed to be within specification. RUNNING MODE After the Initial Calibration period, the device establishes a signal gain and then transitions into 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.

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Device Electrical Output, VOUT Internal Differential Signal, VPROC BRP BOP BOP BRP 1 2 3 4 5 Figure 9: 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. The A17301 incorporates an algorithm for adjusting the signal gain during running mode. This algorithm is designed to optimize the V PROC 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 (see Figure 9). 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.

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 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 appli- cation. This section presents a procedure for correlating factors affecting operating T J. (Thermal data is also available on the Allegro MicroSystems website.) The Package Thermal Resistance, RθJA, 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 θJC, is relatively small component of RθJA. 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 × IIN (1) ΔT = PD × RθJA (2) TJ = TA + ΔT (3) For example, given common conditions such as: TA= 25°C, VCC = 12 V, ICC = 5 mA, and RθJA = 270°C/W, then: PD = VCC × ICC = 12 V × 5 mA = 60 mW Δ T = PD × RθJA = 60 mW × 270°C/W = 16.2°C A worst-case estimate, PD(max), represents the maximum allow- able power level (VCC(max) , ICC(max)), without exceeding TJ(max), at a selected RθJA and TA. Example: Reliability for VCC at TA = 160°C, package UC, using single-layer PCB. Observe the worst-case ratings for the device, specifically: RθJA = 270°C/W, TJ(max) = 175°C, VCC(max) = 26.5 V , and ICC(max) = 7.5 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: ΔTmax = TJ(max) – TA = 175°C – 160 °C = 15 °C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = ΔTmax ÷ RθJA = 15°C ÷ 270°C/W = 55.6 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) ÷ ICC(max) = 55.6 mW ÷ 7.5 mA = 7.41 V The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages ≤VCC(est). Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli- able operation between VCC(est) and VCC(max) requires enhanced RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions. POWER DERATING

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com For Reference Only –N ot for Tooling Use (Reference DWG-0000409, Rev. 2) Dimensions in millimeters – NOT TO SCALE Dimensions exclusive of moldfl ash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A B C D Dambar removal protrusion (12×) Gate and tie burr area Molded Lead Bar to prevent damage to leads during shipment Active Area Depth, 0.38 mm ±0.05 mm 45° 0.85 ±0.05 0.85 ±0.05

0.545 REF× 2

0.25 REF × 4

B 4×10° A DetailA DetailA Branded Face 0.42 ±0.05

1.27 REF × 2

4.00 4.00 R 0.20 All Corners R 0.30 All Corners

1.36 REF

12.20 ±0.10 18.00 ±0.10 1.80 1.50 ±0.05 1.50 ±0.05 C 4.00 0.25+0.07 –0.03 +0.05 –0.10 D Mold Ejector Pin Indent

0.25 REF

0.30 REF

0.38 REF

0.15 REF0.10 +0.06 –0.05 +0.06 –0.07 +0.06 –0.07 +0.06 –0.05 Plating Included 2.20 2.00 E E E2E1 E Hall elements, E1 and E2 (not to scale) F = Five digit part numberLine 1 Standard Branding Reference View XXXXX Date Code Lot Number = Four digit date codeLine 2 = Characters 5 through 8 of Assembly Lot NumberLine 3 F Branding scale and appearance at supplier discretion Figure 8: Package UC, 3-Pin SIP PACKAGE OUTLINE DIAGRAM

Three-Wire Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration A17301 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com

REVISION HISTORY

– October 16, 2018 Initial release For the latest version of this document, visit our website: www.allegromicro.com Copyright ©2018, 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.