Hall-effect IC boosts auto sensing accuracy

Article By : Allegro Microsystems

Allegro’s programmable linear Hall-effect sensor's sensitivity covers 1mV/G to 14mV/G over –40°C to 150°C.

Allegro has introduced a programmable linear Hall-effect sensor IC designed for applications that require high accuracy and high resolution without compromising bandwidth. Allegro’s A1377 employs segmented, linearly interpolated temperature compensation technology. This improvement reduces the total error of the device across the whole temperature range from –40°C to 150°C. As a result, the device is suited for sensing in numerous automotive applications, such as linear and rotary position sensors in actuators and valves.

The A1377 has a broad range of sensitivity and offset operating bandwidth. The accuracy and flexibility of this device is enhanced with user programmability, via the VCC and output pins, which allows the device to be optimised in the application.

This ratiometric Hall-effect sensor IC provides a voltage output that is proportional to the applied magnetic field. The quiescent voltage output (QVO) is user-adjustable from approximately 5% to 95% of the supply voltage. The device sensitivity is adjustable within the range of 1 to 14mV/G.

The features of this linear device make it ideal for use in automotive and industrial applications requiring high accuracy, and apply across an extended temperature range. 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.

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