Micropower Ultrasensitive 3D Hall-Effect Switch

The A1266 integrated circuit is an ultrasensitive Hall-effect switch with 3D omnipolar magnetic actuation. The single silicon chip includes: three Hall plates, multiplexer, small-signal amplifier, chopper stabilization, Schmitt trigger, and NMOS output transistors. The device outputs turn on when a magnetic field of sufficient strength is applied to the sensor in any orientation. Removal of the magnetic field will turn the output off.

Two versions of the A1266 offer a choice of output format: separate X, Y, and Z outputs, or a combined X+Y+Z output. The low operating supply voltage, 2.5 to 5.5 V, and unique clocking algorithm assist in reducing the average power consumption, making it ideal for battery operation (e.g., the power consumption is less than 25 μW with a 3.3 V supply).

The small geometries of the BiCMOS process allow for ultrasmall packages suitable for even space-constrained applications. In this case, a modified SOT23-W surface-mount package is available in a 3-pin (combined output) or a 5-pin (separate outputs) configuration, magnetically optimized for use in a variety of orientations. The packages are lead (Pb) free and RoHS-compliant, with 100% matte-tin leadframe plating.