>Is this just a compass chip mounted above a magnet on a motors shaft?
>
>http://www.encoderdevices.com/ed_15/ed_15.htm
>
>It can't be that simple, can it?

I guess the sensor chip consists of a pair of hall effect sensors at right
angles to each other, which could probably produce the 4096 step accuracy
they talk about, with a bit of on chip processing.

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