XENSIV™ TLE4959-5U-FX Hall magnetic speed sensor with flexible and programmable configuration Our Infineon XENSIV™ TLE4959-5U FX is an integrated differential Hall magnetic speed sensor ideally suited for transmission applications.Its basic function is to provide information about rotational speed and direction of rotation to the transmission control unit. TLE4959-5U FX includes a sophisticated algorithm which actively suppresses vibration while keeping excellent airgap performance.