Three-wire differential speed sensor is Hall-effect-based
The device provides a solution for true zero-speed digital gear tooth sensing. It occupies a small single over-moulded package that can be assembled and used in conjunction with a wide variety of gear tooth sensing applications. The ATS668 is designed for automotive transmission systems and non-automotive applications such as recreational vehicles, industrial equipment, white goods, and exercise equipment.
It incorporates a dual element Hall IC that switches in response to differential magnetic signals created by a ferromagnetic target. The IC contains a compensating circuit designed to eliminate the effects of magnet and system offsets. Digital processing of the analogue signal provides zero-speed performance independent of air gap and dynamic adaptation of device performance to the typical operating conditions found in automotive applications (i.e. vibration and runout). High-resolution peak detecting DACs are used to set the adaptive switching thresholds of the device. Hysteresis in the thresholds reduces the negative effects of any anomalies in the magnetic signal associated with system or target anomalies typically seen in many automotive applications.
Allegro MicroSystems; www.allegromicro.com
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