Tuesday, June 18, 2024

Two-Wire Hall Effect Switches Deliver High Sensitivity and Stability

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Developed using rigorous design processes, the automotive compliant switches with self-diagnosis meet demanding proximity/position-sensing

The two-wire unipolar (AH323xQ/4xQ) and latch (AH327xQ/8xQ) switch integrated circuits (ICs) provide high sensitivity and high stability over wide operating voltage and temperature ranges for use in automotive proximity and position-sensing applications, including seatbelt buckle, power window, gear selector and seat position. The adoption of two-wire hall switches reduces the number of wires required in the harness, saving on system complexity and cost while improving robustness to electrical noise.

The integrated self-diagnostics of AH324xQ and AH328xQ continuously monitor the main device blocks, supply voltage and temperature. A third output state warns of an abnormal condition. These devices are ISO 26262 ASIL-B ready, having been developed using rigorous design processes with safety analysis conducted following the ISO 26262 standard.

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An advanced chopper stabilised design provides superior magnetic operating stability and release points (BOP/BRP) over the 2.7V to 27V operating voltage and -40 degrees Celsius to +150 degrees Celsius temperature range. This stability, coupled with a high ESD rating of 8kV, built-in reverse blocking diode, and supply pin Zener clamp, enables the AH32xxQ series to meet the demanding requirements of automotive proximity/position-sensing applications.

All AH32xxQ devices are supplied in the SC59 package. They are qualified to AEC-Q100, manufactured in IATF 16949 certified facilities and support PPAP documentation. They are now available from Diodes Incorporated.


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