The A1185 and A1186 are ultrasensitive, two-wire, unipolar Hall effect switches. The operate point, BOP, can be field-programmed, after final packaging of the sen- sor and placement into the application. This advanced feature allows the optimiza- tion of the sensor switching performance, by effectively accounting for variations caused by mounting tolerances for the device and the target magnet.
This family of devices are produced on the Allegro MicroSystems new DABIC5 BiCMOS wafer fabrication process, which implements a patented, high-frequency, chopper-stabilization technique that achieves magnetic stability and eliminates the offsets that are inherent in single-element devices exposed to harsh applica- tion environments. Commonly found in a number of automotive applications, the A1185 and A1186 devices are utilized to sense: seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position.
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