Allegro MicroSystems has introduced a true zero-speed, self-calibrating, differential Hall-effect gear-tooth sensor module for two-wire applications such as automotive antilock braking systems (ABS). The ATS640JSB sensor subassembly is a peak detecting device that uses internal gain control to provide extremely stable duty cycles down to zero speed.
Each sensor subassembly consists of a high-temperature plastic shell that holds together a samarium-cobalt magnet, a pole piece, and a true zero-speed BiCMOS differential Hall-effect gear-tooth sensor IC that has been optimised 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 sensor incorporates a dual-element Hall IC that switches in response to differential magnetic signals created by a ferrous target. The sophisticated self-calibrating digital-processing circuitry normalises the internal gain of the device to minimise the effect of air-gap variations and to reduce vibration sensitivity.
The compensation circuitry eliminates magnet and system offsets such as those caused by tilt, yet provides zero-speed detection capabilities without the associated running jitter inherent in classical digital solutions.
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