ATS645LSH ATS645LSH-DS 1000RPM DP7637/1 AEC-Q100 JA108 JA103 JA101 JA102 JA104

Preliminary Subject to Change True Zero Speed Miniature Gear Tooth Sensor PRELIMINARY DATASHEET (subject to change without

ATS645LSH ATS645LSH Preliminary Subject to Change True Zero Speed Miniature Gear Tooth Sensor PRELIMINARY DATASHEET (subject to change without notice) The ATS645LSH ATS645LSH is an optimized Hall effect sensing integrated circuit and magnet combination that provides a user-friendly solution for true zero-speed digital gear-tooth sensing in two-wire applications. The sensor consists of a single-shot molded plastic package that includes a samarium cobalt magnet, a pole piece, and a Hall effect 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 integrated circuit incorporates a dual element Hall effect sensor and signal processing that switches in response to differential magnetic signals created by ferrous gear teeth. The circuitry contains a sophisticated digital circuit to eliminate magnet and system offsets and to achieve true zero speed operation (ref U.S. Patent 5,917,320). A-D and D-A converters are used to adjust the device gain at power up and to allow air gap independent switching. Pin 1: Supply Pin 2: No connection Pin 3: Test pin Pin 4: Ground ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . 26.5 V* Reverse Supply Voltage, VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V Operating Temperature Range, TA . . . . . . . . . . . . . . . . . 40 °C to 150 °C* Storage Temperature, TS . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 °C Package Power Rating, JA . . . . . . . . . . . . . . . . . . . . . . . . 126 °C/W Maximum Junction Temperature, TJmax . . . . . . . . . . . . . . . . . . . . . 165 °C * Operation at increased supply voltages with external circuitry is described in the Applications Information. ATS645LSH-DS ATS645LSH-DS Rev. 1 The regulated current output is configured for two wire applications and the sensor is ideally suited for obtaining speed and duty cycle in ABS and transmission application gear-tooth-based configurations. FEATURES s s s s s s s s s s s s s s Fully optimized differential digital gear tooth sensor Single chip sensing IC for high reliability Internal current regulator for 2 wire operation Small mechanical size (8 mm dia x 5.5 mm length) Air gap independent switch points Digital output representing gear profile Precise duty cycle signal with temperature Large operating air gaps Automatic Gain Control (AGC) Automatic Offset Adjustment circuit True zero speed operation Under-voltage lockout Wide operating voltage range Defined power-on state ATS645LSH ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR CHARACTERISTICS Valid over operating temperature range and Supply Voltage within specification unless otherwise noted. Characteristics Symbol Limits Test Conditions Min. Typ. Max. Units 24 V ELECTRICAL CHARACTERISTICS Supply Voltage VCC Operating, TJ < 165°C 4.0 VCC(UV) VCC 0 5 V - -