Hall-effect switch features low power consumption for battery-operated applications

The low operating supply voltage (1.65 V to 3.5 V) and unique clocking algorithm assist in reducing the average operating power consumption: typically less than 15 µW with a 2.75 V supply.

Unlike some traditional Hall-effect switches, the A1171 allows the user to configure how the device is magnetically actuated. Under default conditions the device will activate output switching with either a north or south polarity magnetic field of sufficient strength. The polarity specific actuation can be set by the user via an external selection pin to operate in a unipolar mode, switching only on a north or south polarity field.

The new device has two push-pull output structures, which source and sink current to eliminate the need for external pull-up resistors. This polarity independence, as well as the minimal power requirements, allows the A1171 to easily replace reed switches, providing superior reliability and ease of manufacturing while eliminating the requirement for signal conditioning.

The A1171 is currently available in the EW 6-pin micro-leaded DFN package measuring 2 mm x 1.5 mm x 0.4 mm.