Product category:
Sensors and Data Acquisition
News Release from: Allegro MicroSystems Europe | Subject: ATS640JSB
Edited by the Electronicstalk Editorial
Team on 10 May 2001
Self-calibrating gear-tooth sensor
controls ABS
Allegro MicroSystems has introduced a new true zero-speed, self-calibrating, differential Hall-effect gear-tooth sensor module for two-wire applications such as automotive antilock braking.
Allegro MicroSystems has introduced a new true zero-speed, self-calibrating, differential Hall-effect gear-tooth sensor module for two-wire applications such as automotive antilock braking systems (ABS) The new ATS640JSB sensor subassembly is a peak detecting device that uses internal gain control to provide extremely stable duty cycles down to zero speed
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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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.
This new device is ideal for use in gathering speed, position and timing information using gear-tooth-based configurations.
The ATS640JSB is particularly suited to those applications that require extremely accurate duty-cycle control or accurate edge detection.
The low vibration sensitivity also makes this device extremely useful for transmission speed sensing.
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