Apparatus and method for providing an output signal indicative of a speed of rotation and a direction of rotation of a ferromagnetic object

摘要

An apparatus and a method provide an output signal indicative of a speed of rotation and a direction of rotation of a ferromagnetic object capable of rotating. A variety of signal formats of the output signal are described.

主权项

1. A rotation detector, comprising:
a magnetic field sensor for providing an output signal proportional to a magnetic field associated with a ferromagnetic object capable of rotating; one or more detector circuits coupled to receive the output signal from the magnetic field sensor, each configured to detect a rotation of the ferromagnetic object, the one or more detector circuits configured to generate a respective one or more output signals, each output signal having respective rising and falling edges; and an output protocol circuit coupled to receive the one or more output signals from the one or more detector circuits and configured to generate an output signal indicative of a speed of rotation of the ferromagnetic object and also indicative of a direction of rotation of the ferromagnetic object, wherein the output signal generated by the output protocol circuit comprises:
a plurality of pulses, each one of the plurality of pulses having a leading edge with a transition direction indicative of the direction of rotation.