Two-Wire Unipolar Vertical Hall-Effect Switches with Advanced Diagnostics

The A1130, A1131, and A1132 are vertical Hall-effect sensor ICs developed in accordance with ISO 26262:2011 (pending assessment). The A113x devices have integrated continuous diagnostic features and a safe output state. These devices feature a two-wire current output interface that facilitates open/short diagnosis along with signal path verification from input to output. These are ideal sensors for safety-critical automotive applications, and can assist a system in meeting the most stringent safety requirements.

This family of unipolar Hall-effect switch ICs is sensitive to magnetic fields that are parallel to the surface of the package. These south pole sensitive switches are temperature stable and include automotive-grade ruggedness features such as reverse-battery protection, overvoltage protection, and load dump capability. Each device includes on a single silicon chip: a voltage regulator, diagnostic circuitry, a Hall-voltage generator, a small-signal amplifier, chopper stabilization, a Schmitt trigger, and an NMOS current output. The on-board regulator permits operation with supply voltages down to 3V.

This family of devices is available in two package styles. The A1130, A1131, and A1132 in the LH package sense magnetic fields perpendicular to the non-leaded side of the package closest to pin 1.

The A1130 is additionally offered in the UA package, which offers magnetic field sensing either perpendicular to the top of the package (-Y option), or sensing perpendicular to the right side of the package closest to pin 3 (-X option).

Allegro’s A1130, A1131, and A1132 were developed in accordance with ISO 26262:2011 as a hardware safety element out of context with ASIL B capability (pending assessment) for use in automotive safety-related systems when integrated and used in the manner prescribed in the applicable safety manual and datasheet.