Melexis’ MLX90324 is a CMOS tri-axis Hall sensor that gives the angular position of a magnetic field parallel to the IC surface. It is designed for contactless rotary position sensors and detects the absolute angular position of a small magnet that is positioned and rotates above the device surface.
An integrated magneto-concentrator (IMC) concentrates the applied magnetic flux density parallel to the IC surface. At the boundaries of the IMC structure, an orthogonal component proportional to the applied flux density can be measured by two pairs of conventional planar Hall plates located orthogonally under the IMC and for each of the two directions parallel with the IC surface (X and Y).
The first part of the sensor encodes a mechanical angle into two sinusoidal signals with 90° phase shift (sine and cosine). The two signals proportional to the magnetic field are amplified, sampled and converted in the digital domain. The digital representations of the two signals are then used to calculate the angle through an Arctangent function implemented by a lookup table.
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