SLOW SPEED SIGNAL DETECTION FOR ABS SENSORS WITH ADAPTIVE TIME WATCHDOG CONCEPT FOR 0Hz CAPABILITY

摘要

The present disclosure relates to a rotation speed sensor, including at least one sensor element to detect a magnetic input signal of the rotation speed sensor, a time watchdog with a programmable time constant and an output control circuit. The time watchdog generates a time-out event when no minimum or maximum or no output switching event of a magnetic input signal of the rotation speed sensor is detected within a time-interval equal to a programmed time constant of the time watchdog. Further, the output control circuit changes the output signal of the rotation speed sensor from a first value to a second value, when a minimum or a maximum or output switching event of the magnetic input signal is detected within the time interval and a change of the magnetic input signal is greater than a predetermined value.