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XENSIV™ - TLE4966 magnetic design for correct direction detection

For many applications the information of speed and rotation direction of a motor is necessary to know. This can be done very convenient with a Hall switch and a magnetized pole wheel mounted on the axle of the motor. To determine the rotation direction, two sensors in a certain distance are used (Figure 1). The direction information is then obtained from the phase difference of the two output signals of the Hall elements S1 and S2. The TLE4966 consists of two Hall elements with a distance of d = 1.45mm and calculates this information internally. A dedicated output pin provides the direction of rotation (HI /LO) corresponding to “right” or “left” whereas the speed is provided on a second output pin.

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• 2025/04/27