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Diagnostic circuit for monitoring an analog-digital converter circuit

  • US 8,373,585 B2
  • Filed: 03/30/2010
  • Issued: 02/12/2013
  • Est. Priority Date: 04/28/2009
  • Status: Active Grant
First Claim
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1. A diagnostic circuit for monitoring an analog-digital converter circuit during an input of a measured value of at least one of a level gauge, a pressure gauge and a flowmeter, comprising:

  • a multiplexer selecting different signals;

    a first microcontroller controlling at least the multiplexer;

    wherein a supply voltage is provided for the microcontroller; and

    wherein the diagnostic circuit is configured to detect a change in the supply voltage on the basis of a comparison of the supply voltage with a stored supply voltage reference value of the supply voltage by utilizing the multiplexer and the first microcontroller.

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