A1162 Datasheet | Allegro MicroSystems

FEATURES AND BENEFITS - User-programmable unipolar switchpoints - Integrated diagnostics for enhanced system safety and reliability - - Enabled on demand - - Integrated electromagnetic coils test the entire sensor signal path - - Designed for ISO 26262:2011 / ASIL systems (QM) - Chopper stabilized - - Resistant to physical stress - - Superior temperature stability - Internal regulator for wide operating voltage range - - 3.8 to 24 V - Automotive-grade ruggedness - - Solid-state reliability - - Reverse-battery protection - - Output short-circuit protection - - AEC-Q100 qualified - - Small surface-mount package PACKAGE: 8-Pin e TSSOP (Suffix LE) Not to scale DESCRIPTION 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 26262:2011. 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 (>BOP max). The output transistor of the A1162 switches off (output signal switches high) when the magnetic field is removed (<BRP min). When the diagnostic feature is enabled, the output of the A1162 provides a square wave output which confirms the device is properly sensing the internally generated magnetic field. Therefore, use of the A1162 either eliminates the need for redundant sensors in safety-critical applications or increases robustness in safety-critical applications that might otherwise require redundant sensors (drive-by-wire systems, etc.). This monolithic IC integrates a voltage regulator, Hall voltage generator, small-signal amplifier, chopper stabilization,...