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)
2016 Editor’s Choice Award Winner
