The A1171 integrated circuit is an ultra sensitive, Hall effect switch with latched digital outputs and either unipolar or omnipolar actuation. It features operation at low supply currents and voltages, making it ideal for battery-operated consumer products.

The low operating supply voltage, 1.65 V to 3.5 V, and unique clocking algorithm assist in reducing the average operating power consumption. For example, the power requirements are less than 15 μW with a 2.75 V supply. Unlike some traditional Hall-effect switches, A1171 in the EW package allows the user to configure how the device is magnetically actuated. By setting the state of an external mode selection pin, the device can be actuated in omni-polar or uni-polar mode. Omni-polar operation is pole independent so the device will react to both North and South magnetic poles. Uni-polar mode is selected by tying the select pin to GND and the two outputs become a South pole activated switch and a North pole activated switch.

Lastly, the A1171 has two push-pull output structures, which source and sink current to eliminate the need for external components.