Accurate position sensing with unidirectional linear Hall IC

December 15, 2016 // By Graham Prophet
In a surface-mount package, this pre-programmed device is intended for automotive and industrial applications requiring high accuracy and small package size. ALS31000 is a unidirectional linear Hall sensor IC targeted at applications involving displacement and angular position sensing.

The accuracy of this factory-programmed device is enhanced via end-of-line programming of the temperature coefficient to optimise both sensitivity and quiescent voltage output across the full operating temperature range. ALS3100 is a ratiometric Hall-effect sensor IC which provides a voltage output proportional to the applied magnetic field. The quiescent voltage output is adjusted to around 0.7V and the output sensitivity is set to 2.4 mV/G.

Each BiCMOS monolithic circuit integrates a Hall element, temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, a clamped low-impedance output stage, and a dynamic offset cancellation technique. The features of this linear device suit it to use in automotive and industrial applications requiring high accuracy and operation across an extended temperature range from -40°C to +150°C.

The device comes in LH package style: a SOT-23W style, miniature, low-profile package for surface-mount applications.