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Analog sensor status detection single wire bus multiplex system

  • US 5,936,520 A
  • Filed: 11/13/1997
  • Issued: 08/10/1999
  • Est. Priority Date: 11/13/1997
  • Status: Expired due to Term
First Claim
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1. A monitoring circuit for a line bus having at least one analog sensor connected thereto, comprising:

  • a microcontroller, said microcontroller polling the analog sensor with a voltage over said bus, said at least one analog sensor producing a current on said bus representative of its status in response to said polling voltage; and

    a measuring circuit, said measuring circuit being responsive to said current of said bus producing by said at least one analog sensor and determining the status of said at least one analog sensor producing said current on the basis of said current the measuring circuit including;

    a current mirror circuit which monitors and generates a current replica of said current produced on said bus; and

    a conversion resistor for receiving said current replica.

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