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Reference voltage diagnostic suitable for use in an automobile controller and method therefor

  • US 20040263180A1
  • Filed: 06/24/2003
  • Published: 12/30/2004
  • Est. Priority Date: 06/24/2003
  • Status: Active Grant
First Claim
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1. A diagnostic apparatus suitable for use in an automobile controller comprising:

  • a power supply terminal conducting a reference voltage;

    a sampling circuit coupled to said power supply terminal and having an output terminal for providing sampled values of said reference voltage; and

    a reference voltage diagnostic circuit having an input terminal coupled to said output terminal of said sampling circuit, wherein said reference voltage diagnostic circuit maintains a historical value of said reference voltage over a predetermined time period, compares a current sampled value of said reference voltage to said historical value, and indicates a fault in said reference voltage in response to said current sampled value being different from said historical value by more than a predetermined threshold.

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