A19302PUBATN-RAE

A19302 ALLEGRO

Document overview

• Manufacturer or author: Provided By www.digicamel.com(free datasheet download site)
• PDF pages: 17

Technical content

The A19302 is an optimized Hall-effect integrated circuit (IC) with the option for PW- or AK-protocol two-wire interface, ideal for applications requiring the determination of speed and direction of the sensed target. The small package includes an integrated capacitor and Hall-based IC in a single overmolded design, with an additional molded lead-stabilizing bar for robust shipping and ease of assembly. The IC’s SolidSpeed Digital Architecture provides highly accurate speed and rotational direction detection. The intelligent algorithms provide signal optimization and compensation capable of maintaining stable operation in the harsh automotive environments common to wheel speed applications. The A19302 was developed in accordance with ISO 26262 as a hardware safety element out of context with ASIL B(D) capability for use in automotive safety-related systems when integrated and used in the manner prescribed in the applicable safety manual and datasheet. Integrated EEPROM memory allows traceability of the device throughout the product lifecycle. The IC is offered in the UB package, which integrates the IC and a high temperature ceramic capacitor in a single overmolded SIP package for enhanced EMC performance. The 2-pin SIP package is lead (Pb) free, with tin leadframe plating. A19302-DS, Rev. 5 MCO-0000789

• Hall-effect technology allows ease of use for ring magnet and ferromagnetic target sensing
• PW and AK Protocol provides speed and direction information, signal integrity, and functional status
• Integrated capacitor in a single overmolded miniature package provides greater EMC robustness
• SolidSpeed Digital Architecture supports advanced algorithms, maintaining pitch accuracy during dynamic air gap disturbances
• ISO 26262 ASIL B(D) with integrated diagnostics and certified safety design process
• EEPROM enables traceability throughout the product life cycle High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor IC Figure 1: Functional Block Diagram A19302 Oscillator EEPROM Digital Controller L-C Output Regulator VCC ADC ADC C-R VCC GND ESDOutput Current Generator FEATURES AND BENEFITS DESCRIPTION December 9, 2021 PACKAGE: Not to scale 2-Pin SIP (suffix UB)

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A. www.allegromicro.com SELECTION GUIDE [1] Part Number Packing A19302PUBATN-FAE Tape and reel, 4000 pieces per reel A19302PUBATN-RAE A19302PUBATN-FPE A19302PUBATN-RPE A19302PUBATN-FAE-A Tape and reel, 4000 pieces per reel A19302PUBATN-RAE-A A19302PUBATN-FPE-A A19302PUBATN-RPE-A [1] Not all combinations are available. Contact Allegro sales for availability and pricing of custom programming options. Configuration Options A19302 F – Pin 1 to pin 2 R– Pin 2 to pin 1 Forward Rotation Direction: PT N- Packing Instructions Package Designation Operating Temperature Range Allegro Identifier and Device Type UBA Protocol Options: P– PW protocol: warning, extended air gap, and standstill pulses enabled Magnetic Temperature Compensation: G– Samarium-cobalt magnet PW protocol: warning, extended air gap, and standstill pulses disabled Ferrite ring magnet or neodymium magnet E B Fault Detection Mode: ASIL protocol enabled-A ASIL protocol disabled[blank] AK protocolA

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Unit Supply Voltage VCC Refer to Power Derating section; potential between pin 1 and pin 2 28 V Reverse Supply Voltage VRCC –18 V Operating Ambient Temperature TA –40 to 160 °C Junction Temperature TJ(max) 175 °C Storage Temperature Tstg –65 to 170 °C INTERNAL DISCRETE CAPACITOR RATINGS Characteristic Symbol Test Conditions Value (Typ.) Unit Nominal Capacitance CSUPPLY Connected between pin 1 and pin 2 (refer to Figure 2) 2.2 nF Figure 2: Typical Application Circuit VCC GND RL CSUPPLYIC VOUT = ICC × RL CL A19302 SPECIFICATIONS PINOUT DIAGRAM 2-Pin SIP Pinout Diagram PINOUT TABLE Name Number Function VCC 1 Supply Voltage GND 2 Ground

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Characteristic Symbol Test Conditions Min. Typ.[1] Max. Unit ELECTRICAL SUPPLY CHARACTERISTICS Supply Voltage [2] VCC Potential between pin 1 and pin 2 -xBx and -xPx variants 4 – 24 V -xAx variant 5.2 – 24 V UVLO Hysteresis VHYS(AK) -xAx variant 1.1 – – V Reverse Supply Current [3] IRCC VCC = VRCC(max) –10 – – mA Supply Zener Clamp Voltage VZsupply ICC = 36.6 mA 28 – – V Supply Current ICC(LOW) Low-current state 5.9 7 8.4 mA ICC(MID) Mid-current state 12 14 16 mA ICC(HIGH) High-current state 23.52 28.0 33.6 mA Supply Current Ratio [4] ICC(MID) / ICC(LOW) Measured as ratio of mid current to low current (isothermal) 1.9 – – – ICC(HIGH) / ICC(LOW) Measured as ratio of high current to low current (isothermal) 3.6 – – – ASIL Safety Current IFAULT Refer to Figure 14 1.5 3.5 3.9 mA Output Rise/Fall Time tr, tf Voltage measured at pin 2 in Figure 2; RL = 100 Ω, CL = 10 pF, measured between 10% and 90% of ICC(LOW) and ICC(MID) (-xBx and -xPx variants) 0 – 1.5 μs Slew Rate SR Measured at pin 2 in Figure 2; RL = 50 Ω, CL = 10 pF, measured between 10% and 90% of ICC(LOW) and ICC(HIGH) or ICC(LOW) and ICC(MID) (-xAx variant) 8 – 28 mA/µs Overtemperature Threshold TJF Junction temperature that sets AK OT bit (-xAx variant) – 175 – °C Overtemperature Hysteresis TJHYS Junction overtemperature threshold hysteresis (-xAx variant) – 15 – °C POWER-ON CHARACTERISTICS Power-On State POS VCC > VCC(min), as connected in Figure 2 ICC(LOW) mA Power-On Time [5] tPO VCC > VCC(min), as connected in Figure 2 – 0.25 1 ms OPERATING CHARACTERISTICS AND PERFORMANCE Operating Differential Magnetic Input [6] BDIFF(pk-pk) Peak-to-peak of differential magnetic input Operating Differential Magnetic Range [6] BDIFF Refer to Figure 6 –700 – 700 G Operating Magnetic Input Signal Variation ∆BDIFF(pk-pk) Bounded amplitude ratio within TWINDOW [7]; no missed output transitions or flat line condition; possible incorrect direction information; see Figure 4 and Figure 5 0.4 – – – Operating Magnetic Input Signal Window TWINDOW Rolling window where ∆BDIFF(pk-pk) cannot exceed bounded ratio; see Figure 4 and Figure 5 4 – – TCYCLE Calibration Period TCAL Period between power-on and valid speed and correct direction output (f ≤ 200 Hz) – – 1.5 TCYCLE Operate Point BOP % of peak-to-peak IC-processed signal – 60 – % Release Point BRP % of peak-to-peak IC-processed signal – 40 – % Switch Point Separation BDIFF(SP-SEP) Required amount of amplitude separation between channel A and channel B at each BOP and BRP occurrence. Channels must be in phase; see Figure 7 20 – – % OPERATING CHARACTERISTICS : Valid over operating voltage and temperature, unless otherwise specified Continued on next page...

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Characteristic Symbol Test Conditions Min. Typ.[1] Max. Unit OUTPUT PROTOCOL CHARACTERISTICS [8] (-xAx variant) Bit Width tp Refer to Figure 8 40 50 60 µs Standstill Period tSTOP 105 150 195 ms AK Off Time tW(PRE) Pre-low time – 75 – µs Pulse Width, ASIL Fault tW(FAULT) Refer to Figure 13 5 – – ms Air Gap Reserve Level BLR Signal amplitude that engages AK LR bit – 24 – Gpk-pk Operating Frequency fSIG 0 – 2.5 kHz OUTPUT PROTOCOL CHARACTERISTICS [8] (-xBx variant) Pulse Width Off Time tW(PRE) Refer to Figure 8 38 45 52 µs Forward Pulse Width tW(FWD) 76 90 104 µs Reverse Pulse Width tW(REV) 153 180 207 µs Pulse Width, ASIL Fault tW(FAULT) Refer to Figure 13 5 – – ms Operating Frequency, Forward Pulses [9] fFWD 0 – 3.9 kHz Operating Frequency, Reverse Pulses [9] fREV 0 – 2.4 kHz OUTPUT PROTOCOL CHARACTERISTICS [8] (-xPx variant) Pulse Width Off Time tW(PRE) Refer to Figure 9 38 45 52 µs Forward Pulse Width tW(FWD) 76 90 104 µs Reverse Pulse Width tW(REV) 153 180 207 µs EA Forward Pulse Width tW(EA FWD) 306 360 414 µs EA Reverse Pulse Width tW(EA REV) 612 720 828 µs Warning Pulse Width tW(WARN) 38 45 52 µs Standstill Pulse Width tW(STILL) 1232 1440 1656 µs Standstill Period tSTOP 590 737 848 ms Pulse Width, ASIL Fault tw(FAULT) Refer to Figure 14 5 – – ms Operating Frequency, Forward Pulses [9] fFWD 0 – 3.9 kHz Operating Frequency, Reverse Pulses [9] fREV 0 – 2.4 kHz Operating Frequency, Warning Pulses fWARN 0 – 5 kHz Operating Frequency, EA Pulses fEA EA pulses output when f < fEA and BDIFF(pk-pk) < BEA – 117 – Hz Air Gap Warning Level BWARN Warning pulses output when BDIFF(pk-pk) < BWARN – 24 – Gpk-pk Extended Air Gap Level BEA EA pulses output when f < fEA and BDIFF(pk-pk) < BEA – 84 – Gpk-pk OPERATING CHARACTERISTICS (continued): Valid over operating voltage and temperature, unless otherwise specified Continued on next page...

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com OPERATING CHARACTERISTICS (continued): Valid over operating voltage and temperature, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Unit THERMAL CHARACTERISTICS Magnetic Temperature Coefficient [10] TC Based on ferrite ring magnet and neodymium magnet (-xxE variant) – 0.16 – %/°C Based on samarium-cobalt magnet (-xxG variant) – 0.04 – %/°C Package Thermal Resistance [11] RθJA Single-layer PCB with copper limited to solder pads – 213 – °C/W [1] Typical values are at TA = 25°C and VCC = 12 V. 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; refer to Power Derating section. [3] Negative current is defined as conventional current coming out of (sourced from) the specified device terminal. [4] Supply current ratio is taken as a mean value of ICC(MID) / ICC(LOW) and ICC(HIGH) / ICC(LOW). [5] Output transients prior to tPO should be ignored. [6] Differential magnetic field is measured for Channel A (E1-E2) and Channel B (E2-E3) independently. Each channel’s differential magnetic field is measured between two Hall elements. Magnetic field is measured orthogonally to the front of the package. BDIFF(pk-pk) only valid at TA(max) due to magnetic temperature compensation. Refer to UB package drawing. [7] Symmetrical signal variation is defined as the largest amplitude ratio from Bn to Bn + TWINDOW. Signal variation may occur continuously while BDIFF remains in the operating magnetic range. [8] Pulse width measured at threshold of (ICC(MID) + ICC(LOW)) / 2 and (ICC(HIGH) + ICC(LOW)) / 2. [9] These frequency ranges are based on valid pulse width generation with each pulse width preceding with a tw(PRE)(MAX). Frequency is based on BDIFF frequency. [10] Magnets decrease in strength with increasing temperature. The device temperature coefficient compensates to help maintain a consistent maximum air gap over temperature. [11] Additional thermal information is available on the Allegro website.

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Target S S BDIFF TCYCLE N S N Target Cycle; the amount of rotation that moves one north and one south pole across the sensorTCYCLE = The differential magnetic flux density sensed by the sensorBDIFF = Figure 3: Definition of TCYCLE Figure 4: Single Period-to-Period Variation Figure 5: Repeated Period-to-Period Variation Bn Bn+m Applied BDIFF TWINDOW Bn Bn+m Applied BDIFF TWINDOW

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 6: Definition of Differential Magnetic Input 0 G BDIFF(max) BDIFF(min) Time Applied BDIFF BDIFF BDIFF(pk-pk) BDIFF(BRP) BDIFF(BOP) BDIFF(pk-pk) BDIFF(pk-pk) BDIFF(SP) BDIFF(SP) BDIFF(SP)B=DIFF(SP-SEP) (B )OP (B )RP TCYCLE Channel A Channel B SN NS S N Figure 7: Definition of Switch Point Separation

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com FUNCTIONAL DESCRIPTION The A19302 sensor IC contains a single-chip Hall-effect circuit that supports three Hall elements. These elements are used in differential pairs to provide electrical signals containing informa- tion regarding edge position and direction of target rotation. The A19302 is intended for use with ring magnet targets, or, when back-biased with an appropriate magnet, with ferromagnetic targets. The IC detects the peaks of the magnetic signals and sets dynamic thresholds based on these detected signals. Output events are triggered when BDIFF transitions through the switch points. FORWARD ROTATION For the –Fxx variant, when the target is rotating such that a target feature passes from pin 1 to pin 2, this is referred to as forward rotation. This direction of rotation is indicated on the output by the AK or PW protocol. For the –Rxx variant, forward direction is indicated for target rotation from pin 2 to 1 (refer to Figure 8). REVERSE ROTATION For the –Fxx variant, when the target is rotating such that a target feature passes from pin 2 to pin 1, this is referred to as reverse rota- tion. This direction of rotation is indicated on the output by the AK or PW protocol. For the –Rxx variant, reverse direction is indicated for target rotation from pin 1 to 2. AK PROTOCOL DESCRIPTION When a target passes in front of the device (opposite the branded face of the package case), the A19302 generates an AK word for each magnetic pole or for each tooth and each valley of the target. Speed information is provided by the output pulse rate, while direction of target rotation is provided in the AK data bits. PW PROTOCOL DESCRIPTION When a target passes in front of the device (opposite the branded face of the package case), the A19302 generates an output pulse for each magnetic pole or for each tooth and each valley of the target. Speed information is provided by the output pulse rate, while direction of target rotation is provided by the duration of the output pulses. Figure 8: Target Orientation Relative to Device (ring magnet shown). N N NN N S S S SS N N NN N S S S SS (A) Forward Rotation (-F variant) (B) Reverse Rotation (-F variant) Branded Face of Sensor Branded Face of Sensor Pin 1 Pin 2 Pin 1 Pin 2 Rotating Target Rotating Target Figure 9: Output Timing Example

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com DESCRIPTION OF AK PROTOCOL The A19302 will fulfill the requirements according to the AK protocol specification “Requirement Specifications for Standard- ized Interface for Wheel Speed Sensors with Additional Infor- mation ‘AK-Protokoll’” version 4.0 with some modifications as discussed in the following. AK BIT DEFINITIONS The AK protocol (-xAx variant) consists of 10 pulses. A single speed pulse, 8 data bits, and a single parity bit. The speed pulse and data bit definitions are described below. Field Abbreviation Coding Speed Pulse SP ICC(HIGH) if speed pulse, ICC(MID) if standstill pulse Bit Number Field Abbreviation Coding Post-Power-On Default Value

0 Air Gap Reserve LR 1 if Gpkpk < BLR(pk-pk), 0 otherwise 0

1 Status Mode M 1 if not in running mode, 0 otherwise 1

2 Overtemperature OT 1 if overtemperature, 0 otherwise 0

3 Validity of the Direction of Rotation GDR 1 if direction is valid, 0 otherwise 0

4 Direction DR 1 if forward rotation, 0 if reverse rotation 0

5 Air Gap Indication LM0 LM LSB 0

6 Air Gap Indication LM1 LM 0

7 Air Gap Indication LM2 LM MSB 0

8 Parity P 1 if parity incl. parity bit is even, 0 otherwise 1 LM AIR GAP TABLE Data bits [5:7] report the air gap indication. These bits give 8 air gap ranges in respect to the measured peak to peak magnetic field (BDIFF(pk-pk)). LM2 LM1 LM0 Threshold Value (Typ.) Units 0 0 0 ≤ 12 G 0 0 1 > 12 G 0 1 0 > 18 G 0 1 1 > 24 G 1 0 0 > 36 G 1 0 1 > 54 G 1 1 0 > 78 G 1 1 1 > 111 G

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com BOP BOP BRP BRP Device Orientation to Target Package Case Branded Face Target Magnetic Profile Mechanical Position (Target moves past device pin 1 to pin 2) Target (Radial Ring Magnet) IC Internal Differential Analog Signals, BDIFF Detected Channel Switching Output Events (Pin 2 Side) (Pin 1 Side) (Top View of Package Case)IC This pole sensed later This pole sensed earlier NSS Channel A Channel A Channel B Channel B Package Case Branded Face (Pin 2 Side) (Pin 1 Side) (Top View of Package Case) Back-Biasing Magnet This tooth sensed earlier This tooth sensed later Device Orientation to Target Mechanical Position (Target moves past device pin 1 to pin 2) Target (Gear) Target Magnetic Profile IC South Pole North Pole BOP BOP BRP BRP IC Internal Differential Analog Signals, BDIFF Detected Channel Switching Output Events Channel A Channel A Channel B Channel B Figure 10: Basic Operation Channel A or Channel B can be used as the output switching channel. This is determined on startup by the first channel that switches. The non-switching channel is used for direction detection.

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Calibration and Direction Validation When power is applied to the A19302, the built-in algorithm per- forms an initialization routine. For a short period after power-on, the device calibrates itself and determines the direction of target rotation. Once the calibration routine is complete, the A19302 will transmit accurate speed and direction information. Target Rotation N Target Magnetic Differential Profile t Opposite North Pole Opposite South Pole Opposite N→S Boundary Opposite S→N Boundary Device Location at Power-On NNSS S Figure 11: Calibration Behavior (-xBx Variant)

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Direction Changes, Vibrations, and Anomalous Events During normal operation, the A19302 will be exposed to changes in the direction of target rotation (Figure 12), vibrations of the target (Figure 13), and anomalous events such as sudden air gap changes. During calibration, output pulses with direction information are immediately transmitted to the output. Depending on target design, air gap, and the phase of the target, direction may be momentarily incorrect. Following a direction change in running mode, direction changes are immediately transmitted to the output. NormalT arget Rotation NormalT arget Rotation S S SNN S SN NN Target Differential Magnetic Profile Vibration Figure 12: Direction Change Behavior Figure 13: Vibration Behavior N S N S N S N NS Forward Rotaon Reverse Rotaon Direcon Change Target Differenal Magnec Profile ICC

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ASIL Safe State Output Protocol The A19302 is being developed in accordance with ISO 26262:2011 (2018) as a hardware safety element out of context targeting ASIL B(D) capability for use in automotive safety-related systems when integrated and used in the manner prescribed in the applicable safety manual and datasheet. The -xxx-A variant enables diagnostic circuitry that will continu- ously monitor occurrences of failure defects within the IC. Refer to Figure 14 for the output protocol of the ASIL safe state after an internal defect has been detected. Error Protocol will result from faults which cause incorrect signal transmission (i.e., too few or too many output pulses). Note: If a fault exists continuously, the device will stay in perma- nent safe state. Refer to the A19302 Safety Manual for additional details on the ASIL Safe State Output Protocol. N S NMagnec Encoder ICC(HIGH) ICC(LOW) ICC(HIGH) S N Output Events (Normal Operaon) ICC(LOW) Fault Protocol (PW) Fault Protocol (AK) Error Error ICC(MID) ICC(MID) IFAULT IFAULT I tw(FAULT) tCAL tw(FAULT) tCAL Figure 14: Output Protocol (ASIL Safe State)

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com The device must be operated below the maximum junction tem- perature 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 TJ. (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 (RθJC ) is a 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 or 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) T J = TA + ΔT (3) For example, given common conditions such as: TA= 25°C, VCC = 12 V, ICC = 7.15 mA, and RθJA = 213°C/W, then: PD = VCC × ICC = 12 V × 7.15 mA = 85.8 mW ΔT = PD × RθJA = 85.8 mW × 213°C/W = 18.3°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 = 150°C, package UB, using minimum-K PCB. Observe the worst-case ratings for the device, specifically: RθJA = 213°C/W, TJ(max) = 175°C, VCC(max) = 24 V , and ICC(A VG) = 16.6 mA. ICC(A VG) is computed using ICC(HIGH)(max), ICC(MID)(max), and ICC(LOW)(max), with an input signal frequency of fSIG(max) (AK protocol). Calculate the maximum allowable power level (PD(max) ). First, invert equation 3: ΔTmax = TJ(max) – TA = 175 °C – 150 °C = 25°C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = ΔTmax ÷ RθJA = 25°C ÷ 213°C/W = 117.4 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) ÷ ICC(AVG) = 117.4 mW ÷ 16.6 mA = 7.0 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 100 120 140 160 180 Temperature (°C) 100 200 300 400 500 600 700 800 Power Dissipation P D (mW) Power Dissipation versus Ambient Temperature

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 15: Package UB, 2-Pin SIP For Reference Only –N ot for Tooling Use (Reference DWG-0000408, Rev. 3) Dimensions in millimeters – NOT TO SCALE Dimensions exclusive of moldfl ash, gate burs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown Mold Ejector Pin Indent A B C D E F Dambar removal protrusion (8×) Gate and tie burr area Hall elements (E1, E2, and E3); not to scale Molded Lead Bar for preventing damage to leads during shipment Active Area Depth, 0.38 mm ±0.03 Branding scale and appearance at supplier discretion

0.25 REF

0.30 REF

4 × 2.50 ±0.10 4 × 7.37 REF 4 × 0.85 REF

0.38 REF

45° 0.85 ±0.05 0.85 ±0.05 B 4×10° A Branded Face 0.25 +0.07 –0.03 0.42 ±0.05 4.00 4.00 4.00 1.00 ±0.05 1.80 ±0.10

2.54 REF

12.20 ±0.10 1.80 1.50 ±0.05 1.50 ±0.05 C F E1 E3 1.50 1.50 E E E E E 0.50 E 1.39 E D Lines 1, 2, 3 = Max 5 characters per line Line 1: 5-character Part Number Line 2: 4-digit Date Code Line 3: Characters 5, 6, 7, 8 of Asembly Lot Number Standard Branding Reference View Date Code Lot Number 19302 +0.06 –0.05 +0.06 –0.07 +0.06 –0.07 +0.06 –0.05 18.00 ±0.10 PACKAGE OUTLINE DRAWING

High-Accuracy, Pulse-Width or AK Protocol Hall-Effect Wheel Speed and Direction Sensor ICA19302 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com

Revision History

– February 24, 2020 Initial release

1 April 9, 2020 Updated Selection Guide

2 May 21, 2020 Updated ASIL assessment status (pages 1-2), Operating Differential Magnetic Input test conditions (page 4), ASIL Fault Pulse Width characteristic name (page 5), and Footnote 6 (page 6). 3 September 18, 2020 Updated ASIL status (pages 1-2) and other minor editorial updates. 4 October 14, 2020 Added Description of AK Protocol (page 10). 5 December 9, 2021 Updated Figure 9 (page 9) and Bit 4 Coding (page 10). For the latest version of this document, visit our website: www.allegromicro.com Copyright 2021, Allegro MicroSystems. Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. 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 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.