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Hall-effect switch suits battery-operated apps

Posted: 13 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Hall-effect switch? battery-operated devices? WLCSP?

A1172

Allegro MicroSystems Inc. has introduced a new ultrasensitive, Hall-effect switch with latched digital outputs and omnipolar magnetic actuation. It features operation at low supply currents and voltages, making it suitable for battery-operated electronics. The low operating supply voltage, 1.65V to 3.5V, and unique clocking algorithm assist in reducing the average operating power consumption, the company claims. For example, the power requirements are less than 15mW with a 2.75 V supply.

Unlike many Hall-effect switches, both north and south polarity magnetic fields of sufficient strength activate output switching to either off or on. Additionally, the A1172, available in a four-pin wafer level chip scale package (WLCSP), provides two push-pull outputs. These outputs are configured such that one output switches off in the absence of sufficient magnetic field, while the other output switches on in the absence of a magnetic field.

This polarity-independence, as well as the minimal power requirements, allows the A1172 to easily replace reed switches, providing superior reliability and ease of manufacturing while eliminating the requirement for signal conditioning.

Allegro's A1172 device is targeted at the consumer market and is available in a four-pin WLCSP.





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