Patent ID: 8818749
Filing Date: 2014-08-26
Classification: G01R

Abstract:
1. A magnetic field sensor, comprising: a magnetic field sensing element supported by a substrate, wherein the magnetic field sensing element is configured to generate a self-test signal responsive to a pulsing self-test magnetic field during one or more self-test time periods; a self-test circuit supported by the substrate, the self-test circuit comprising: a decoder coupled to receive the diagnostic input signal, configured to decode the diagnostic input signal, and configured to generate a decoded diagnostic signal, or an internal diagnostic clock generator configured to generate the diagnostic clock signal to control the self-test current to comprise a group of current pulses during the one or more time periods, wherein, the diagnostic request processor is configured to generate the diagnostic control signal to control the self-test current in response to at least one of the decoded diagnostic signal or the diagnostic clock signal.