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Two-wire gear tooth sensor. (Sensors & Actuators).

Allegro MicroSystems, Inc. has introduced the next-generation differential digital gear tooth sensor with a two-wire back-biased package, peak detecting algorithems and automatic gain control. The ATS645 is suitable for true zero-speed gear tooth sensing in two-wire applications by providing digital detection of gear tooth edges. This sensing IC consists of a single-shot molded plastic package, a single chip differential Hall-effect sensor IC, a Samarium cobalt magnet and a flat ferrous pole piece. The two Hall elements are spaced 1.5 mm apart, allowing the device to sense small gear teeth geometries. The magnetic gradient is measured by the passing of a ferrous object, converted to an analog voltage and processed to provide a digital output signal. It 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. The device makes speed sensing using a f errous target with symmetrical teeth very simple, and it removes the third sense wire from the circuit. Allegro MicroSystems, Inc., 115 Northeast Cutoff, Box 15036; Worcester, MA 01615; (508) 853-5000; www.allegromicro.com.

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Publication:ECN-Electronic Component News
Geographic Code:1USA
Date:May 15, 2003
Words:198
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