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Liquid-level gauge driver circuit

  • US 5,887,479 A
  • Filed: 12/31/1996
  • Issued: 03/30/1999
  • Est. Priority Date: 12/31/1996
  • Status: Expired due to Term
First Claim
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1. An integrated circuit embodied in a single semiconductor chip for providing a liquid level gauge display driving signal to a liquid level gauge, the integrated circuit receiving a liquid level signal from a liquid level sensor unit, the integrated circuit comprising:

  • a clock signal circuit for providing a clock signal at a clock frequency;

    a digital logic circuit coupled to the clock signal circuit for converting the clock signal into a plurality of internal clock signals having different frequencies;

    a comparing circuit coupled to said digital logic circuit for generating the liquid level gauge display driving signal and for comparing the liquid level signal with the liquid level gauge display driving signal;

    a current switch circuit coupled to the comparing circuit for driving a reference current into the liquid level sensor unit, the reference current being converted into the liquid level signal having a voltage value proportional to a liquid level measured by the liquid level sensor unit, the voltage value of the liquid level signal then being fed into the comparing circuit; and

    a gauge driver circuit coupled to said comparing circuit for driving the liquid level gauge.

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