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Micropower Hall-Effect Switch
August 2008
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An ultrasensitive Hall-effect switch with latched digital outputs and omnipolar magnetic actuation is suited for battery-operated electronics. Its low operating supply voltage, 1.65 to 3.5 V, and unique clocking algorithm assist in reducing the average operating power consumption. The A1172 switch, available in a four-pin wafer-level chip-scale package, 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 reliability and ease of manufacturing while eliminating the need for signal conditioning.

Allegro MicroSystems, Inc.


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