Micropower Hall-effect Switch Conserves Board Space
Allegro MicroSystems introduced an ultra sensitive, Hall-effect switch with latched digital outputs and omnipolar magnetic actuation. It features operation at low supply currents and voltages, making it appropriate 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. For example, the power requirements are less than 15 mW with a 2.75V supply. 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, 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 provide reliability and while eliminating the requirement for signal conditioning. Allegro’s A1172 device is priced at $0.40 in quantities of 1,000.