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Temperature sensor and related methods

  • US 6,824,307 B2
  • Filed: 11/09/2001
  • Issued: 11/30/2004
  • Est. Priority Date: 12/12/2000
  • Status: Expired due to Fees
First Claim
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1. A temperature sensor comprising:

  • a capacitor;

    a circuit element coupled in series with said capacitor and having a resistance that varies with temperature;

    a plurality of calibration resistors coupled to said capacitor and having different resistance values; and

    a controller for sequentially charging said capacitor through said circuit element and each of said calibration resistors, measuring respective charging times required to charge said capacitor to a predetermined threshold through said circuit element and said calibration resistors, cooperating with said plurality of calibration resistors to determine a capacitance variation of said capacitor, and determining the temperature based upon the charging times and the capacitance variation.

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