Three-Wire Hall-Effect Switch with Advanced Diagnostics

The APS11450 is a three-wire planar Hall-effect sensor integrated circuit (IC) developed in accordance with ISO 26262 (pending assessment). It includes internal diagnostics and a fault state that supports functional safety. The enhanced three-wire interface provides interconnect open/short diagnostics and a fault state to communicate diagnostic information while maintaining compatibility with legacy three-wire systems. The continuous background diagnostics are transparent to the host system and results in a reduced fault tolerant time.

The APS11450 product options include magnetic switchpoints, temperature coefficient, hysteresis, and response to north or south magnetic fields (unipolar switch) or both (bipolar latch or omnipolar switch). The response can be matched to SmCo, NdFeB, or low-cost ferrite magnets. For situations where a functionally equivalent three-wire latch device is preferred, refer to the APS12450.

APS11450 sensors are engineered to operate in the harshest environments with minimal external components. They are qualified beyond the requirements of AEC-Q100 Grade 0 and will survive extended operation at 175°C junction temperature.

These monolithic ICs include on-chip reverse-battery protection, overvoltage protection (e.g., 40 V load dump), ESD protection, overtemperature detection, and an internal voltage regulator for operation directly from an automotive battery bus. These integrated features reduce the end-product bill-of-materials (BOM) and assembly cost.

Package options include industry-standard surface-mount SOT (LH) and through-hole SIP (UA) packages. Both packages are RoHS-compliant and lead (Pb) free with 100% matte-tin-plated leadframes.

APS11450 was developed in accordance with ISO 26262:2011 as a hardware safety element out of context with ASIL B capability (pending asessment) for use in automotive safety-related systems when integrated and used in the manner prescribed in the applicable safety manual and datasheet.