Two-wire wheel-speed and direction sensor

25 August 2004 Switches, Relays & Keypads

Allegro MicroSystems' ATS650LSH is a two-wire sensor module designed for wheel-speed and direction sensing. The 4-lead module incorporates an integrated magnet and a single-chip IC containing three highly sensitive Hall-effect sensing elements and a sophisticated digital circuit to provide accurate speed and direction information. The regulated current output is configured for two-wire operation, and integrates the direction and diagnostic information with the speed signal using a PWM protocol. The device is optimised for a 2,5 mm airgap (as used on typical ABS targets). The use of triple Hall sensors provides quick calibration within three target edges. The ATS650LSH features true zero-speed operation, and will operate up to frequencies of more than 8 kHz.

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