Magnetic Field Sensors With Self Test

摘要

A system includes a magnetic target and a magnetic field sensor. The magnetic field sensor comprises an output node; a circuit to detect a magnetic field produced by the magnetic target; and a processor. The processor may be configured to transmit a signal onto the output node representing the detected magnetic field; detect whether the transmitted signal is interrupted by an external source; and, if the signal is interrupted, initiate a self-test of the apparatus. Corresponding methods and apparatuses are also disclosed.

主权项

1. A method comprising:
detecting, by a magnetic field sensor, a magnetic field; driving a signal representing the magnetic field onto an output node of the magnetic field sensor, receiving, by the magnetic field sensor, the signal on the output node; determining if the driven signal is interrupted by an external source; and when the driven signal is interrupted, initiating a self-test.