Active sensor for use as wheel rotational speed sensor in motor vehicle, has changeover module that changes between normal operating mode and special operating mode by reversal of polarity of supply voltage present at connections

摘要

The sensor (1) has a sensor unit (2), an evaluation circuit (3) and two connecting lines (4, 5) with a respective connection (41, 51) for transmitting sensor-related information, where supply voltage of the sensor is present on the connecting lines. A changeover module (6) changes between a normal operating mode and a special operating mode by the reversal of the polarity of the supply voltage present at the connections. An independent claim is also included for a method for driving an active sensor.