A1184

• Chopper stabilization
  • Low switchpoint drift over operating temperature range
  • Low stress sensitivity
• Field-programmable for optimized switchpoints
• On-chip Protection
  • Supply transient protection
  • Reverse-battery protection
  • On-board Voltage Regulator
  • 3.5 V to 24 V operation

The A1184 device is a standard, two-wire, unipolar, Hall effect switches. The operate point, BOP, can be field programmed, after final packaging of the sensor and placement into the application. This advanced feature allows the optimization of the sensor switching performance, by effectively accounting for variations caused by mounting tolerances for the A1184 and the target magnet.

A1184 family of devices are produced on the Allegro MicroSystems advanced BiCMOS wafer fabrication process, which implements a patented, high-frequency, chopper-stabilization technique that achieves magnetic stability and eliminates the offsets that are inherent in single-element devices exposed to harsh application environments. Commonly found in a number of automotive applications, the A1184 is utilized to sense: seat track position, seat belt buckle presence, hood/ trunk latching, and shift selector position.