Allegro MicroSystems Inc. (Worcester, MA) introduced a next-generation, differential digital, gear tooth sensor with a two-wire back-biased package, peak detecting algorithms and automatic gain control, the ATS645, which provides a user-friendly solution for true zero-speed gear tooth sensing in two-wire applications by providing digital detection of gear tooth edges. The ATS645 is suitable for obtaining speed and duty cycle in ABS and transmission application, gear-tooth-based configurations, and is primarily targeted to the automotive marketplace.
The ATS645 consists of a single-shot, molded plastic package containing a single chip differential Hall-effect sensor IC, a Samarium Cobalt magnet, and a flat ferrous pole piece. The two Hall elements are spaced 1.5mm 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.
The ATS645 has a 22-week lead time to market and is priced at $1.51 in quantities of 100,000.
