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Based on the Anisotropic MagnetoResistive (AMR) effect, the KMI23/2 and the KMI23/4
detect the rotational speed of target wheels. The KMI23/2 is used with active target
wheels (multipole encoders) and the KMI23/4 is used with passive target wheels
(ferromagnetic gear wheels). This design delivers secure speed information over a wide
range of speed, air gap and temperature. It delivers the speed information via a current
protocol at the supply pins.