A1160: Chopper-Stabilized Precision Hall-Effect Switch With Advanced Diagnostics


The A1160 is a unipolar, Hall-effect switch with an externally enabled diagnostic function. In normal operating mode, the A1160 functions as a standard, unipolar Hall-effect switch. The output transistor turns on (output signal switches low) in the presence of a sufficient magnetic field (>BOP(max)). Additionally, the output transistor of the A1160 switches off (output signal switches high) when the magnetic field is removed (<BRP(min)).

The A1160 includes conductive coils in close proximity to the Hall element. When the diagnostic feature is enabled, these coils are energized. The energized coils generate an internal magnetic field that can be sensed by the Hall element. While in Diagnostic mode, the output of the A1160 provides a square wave output, which confirms the IC is properly sensing the internally generated magnetic field. The Diagnostic mode exercises the entire magnetic and electrical signal path internal to the IC, fully confirming functionality. Therefore, use of the A1160 either eliminates the need for redundant sensors in safety critical applications or increases robustness in safety critical applications that require redundant sensors (drive-by-wire systems and so forth).

The A1160 Hall-effect sensor IC is extremely temperature-stable and stress-resistant, especially suited for operation at temperature ranges up to 150°C. 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. This device includes, on a single silicon chip: a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a open-drain output able to sink up to 25 mA. An on-board regulator permits operation with supply voltages of 3.8 to 24 V.

The A1160 is provided in a 5-pin SOT23W. The package is lead (Pb) free, with 100% matte-tin leadframe plating.

Top Features

  • AEC-Q100 automotive qualified 
  • Unipolar switchpoints
  • Externally enabled diagnostics feature
  • Diagnostics feature exercises the entire magnetic and electrical signal path within the IC
  • Resistant to physical stress
  • Superior temperature stability through advanced chopper stabilization techniques
  • Output short-circuit protection
  • Internal regulator enables operation from unregulated supplies
  • Reverse-battery protection
  • Solid-state reliability
  • Small surface-mount package