XENSIV™ TLE4955C E4 magnetic speed sensor based on Hall technology with excellent air-gap performance Infineon XENSIV™ Hall sensor detects tooth and magnet encoder motion. A back-biasing permanent magnet is used to sense ferromagnetic objects. Self-calibration cancels offsets, and a current output PWM protocol is included. TLE4955C-E4 features advanced vibration suppression and high magnetic sensitivity for excellent airgap performance.