Micropower ultra-sensitive hall-effect switch
Allegro MicroSystems, Inc. introduces a new ultra sensitive, the A1172 Hall-effect switch with latched digital outputs and omnipolar magnetic actuation. The A1172 is an ultra-sensitive, pole-independent Hall-effect switch with a latched digital output. It features operation at low supply currents and voltages, making it ideal for battery-operated electronics. The 1.65 to 3.5 V operating supply voltage and unique clocking algorithm reduce the average operating power requirements to less than 15 µW with a 2.75 V supply. Allegro’s A1172 device is targeted at the consumer market and is available in a four-pin wafer level chip scale package (CG).
The A1172 has two push-pull output structures. Omnipolar activation for the output function is available on each output structure. As such, either a north or south pole of sufficient strength turns the available outputs off or on. The A1172 contains two complementary outputs. Therefore, for a fixed magnetic field, one output will be in a high voltage state and one output will be in a low voltage state. Unlike many Hall-effect switches, both north and south polarity magnetic fields of sufficient strength activate output switching, to either off or on. Additionally, Allegro’s 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.
The A1172 device offers magnetically optimized solutions, suitable for most applications. The wafer level chip scale package (WLCSP) is approximately only 1 mm by 1 mm by 0.5 mm. This package is smaller than most plastic packages and reduces the printed circuit board area consumed by micropower Hall-effect switches. 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.
Improved stability is made possible through dynamic offset cancellation using chopper stabilization, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. This device includes, on a single silicon chip, a Hall-voltage generator, a smallsignal amplifier, chopper stabilization, a latch, and a MOSFET output.
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