Compact Hall sensor IC works under extreme temperatures

December 13, 2016 // By Christoph Hammerschmidt
easuring displacement and angular position is a frequent use case in the automotive and industrial domains. Examples are applications that process the position of the gas or brake pedal positions or of the gear lever. Allegro MicroSystems is targeting these applications with its new ALS31000, a unidirectional Hall sensor IC. The device combines high accuracy with small package size.

The accuracy of this factory-programmed Hall sensor is enhanced via end-of-line programming of the temperature coefficient to optimize both sensitivity and quiescent voltage output across the full operating temperature range.

The 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 0.7 V 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 proprietary dynamic offset cancellation technique. The features of this linear device make it ideal for use in applications requiring high accuracy and operation across an extended temperature range from -40°C to +150°C.

Allegro’s ALS31000 sensor IC family is offered in the LH package style: a SOT-23W style, miniature, low-profile package for surface-mount applications. The package is lead (Pb) free, with 100% matt-tin leadframe plating. 

For a copy of the data sheet click here ALS31000 linear Hall-effect sensor