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Magnetic field sensors with self test

  • US 9,739,846 B2
  • Filed: 10/03/2014
  • Issued: 08/22/2017
  • Est. Priority Date: 10/03/2014
  • Status: Active Grant
First Claim
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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 by comparing the received signal to the driven signal by determining if a voltage of the output node was driven to a predetermined voltage state during transmission of the signal representing the magnetic field;

    interrupting the signal representing the magnetic field andwhen the driven signal is interrupted, initiating a self-test.

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