XENSIV™ - TLE4959-5U FX magnetic speed sensor flexible, Hall based and programmable 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.