Allegro MicroSystems, LLC introduces a new unipolar Hall-effect switch

The A1162 is a unipolar Hall-effect switch with an externally enabled diagnostic function and user-programmable switchpoints. On-chip electromagnetic coils are used to implement self-test of the sensor’s entire magnetic and electrical signal chain. It is designed for systems where precise magnet switchpoints and safety, reliability, or both, are critical, such as those designed to meet the requirements of ISO 26262.

In normal operating mode, the A1162 functions as a standard unipolar Hall-effect switch. The device output transistor turns on (output signal switches low) in the presence of sufficient magnetic field (>B_OP max). The output transistor of the A1162 switches off (output signal switches high) when the magnetic field is removed  ( RP min).