Hall-Effect Latch
November 2008
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An ultrasensitive, Hall-effect latch designed for portable devices employs rotational detection systems with a power supply voltage between 1.65 and 3.5 V. With a clocking scheme that will minimize power consumption in portable devices, the A1174 device has a single push-pull output structure and does not require an external pull-up resistor for reliable operation. When a sufficient positive magnetic field is present on the device, the device output transitions to the low state and is latched in this state until a negative field of sufficient strength latches the device output into the high state.

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