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Fuel gauge circuit and battery pack

  • US 8,658,300 B2
  • Filed: 01/12/2010
  • Issued: 02/25/2014
  • Est. Priority Date: 01/14/2009
  • Status: Active Grant
First Claim
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1. A fuel gauge system for detecting a residual quantity of a battery, comprising:

  • a substrate having a positive power-supply terminal;

    a protection circuit disposed on the substrate, the protection circuit protecting charging and discharging of the battery, and having a voltage monitor terminal; and

    a fuel gauge circuit disposed on the substrate, comprising;

    a voltage sensor;

    a voltage monitor terminal disposed on a side of the fuel gauge circuit, facing the positive power-supply terminal of the substrate, and connected to each of the positive power-supply terminal of the substrate and the voltage sensor disposed in the fuel gauge circuit;

    a voltage through terminal disposed on a side of the fuel gauge circuit, facing the protection circuit and being opposite to the side facing the positive power-supply terminal, and connected to the voltage monitor terminal of the protection circuit; and

    a wiring disposed within the fuel gauge circuit to connect the voltage monitor terminal of the fuel gauge circuit to the voltage through terminal.

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