A1162: Programmable Precision Hall-Effect Switch with Advanced Diagnostics

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 and/or reliability are critical. 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, Schmitt trigger, and short-circuit-protected open-collector output able to sink up to 25 mA. The on-board regulator permits operation with supply voltages of 3.8 to 24 V. It is temperature-stable and stress-resistant, making it especially suited for operation over temperature ranges up to 150ºC (L temperature range). Superior high-temperature performance is made possible through advanced dynamic offset cancellation techniques, which reduce the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress.

 CHINA ELECTRONICS MARKET (CEM) EDITOR’S CHOICE AWARD

China Electronics Market (CEM) 

2016 Editor’s Choice Award Winner

Top Features

  • User-programmable unipolar switchpoints
  • Integrated diagnostics for enhanced system safety and reliability
    • Enabled on demand
    • Integrated electromagnetic coils test the entire sensor signal path
  • 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A1162LLETR-T 8-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep
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Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.