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Semiconductor integrated circuit having a digital temperature sensor circuit

  • US 5,835,553 A
  • Filed: 04/22/1996
  • Issued: 11/10/1998
  • Est. Priority Date: 04/20/1995
  • Status: Expired due to Fees
First Claim
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1. A semiconductor integrated circuit comprising:

  • a temperature sensor circuit including a pulse source for generating a count pulse and a resistor having a resistance changing dependently upon a temperature change, said temperature sensor circuit being configured to convert the chance of the resistance of said resistor responding to said temperature change into a count pulse signal representative of said temperature chance in response to a temperature measuring signal having a first frequency; and

    a counter counting said count pulse signal and accumulating a count value of said count pulse signal, said counter outputting and resetting the accumulated count value in response to a reset signal having a second frequency lower than said first frequency,wherein said temperature sensor circuit includes;

    a delay circuit having an RC time constant circuit composed of said resistor and a capacitor, said delay circuit outputting a delayed signal that includes a delay of said temperature measuring signal by a time corresponding to the time constant of said RC time constant circuit;

    a clock generator for generating a clock signal of a third frequency higher than said first frequency, in synchronism with said temperature measuring signal; and

    a gate circuit receiving said delayed signal and said clock signal, for generating said count pulse signal by passing said clock signal until said delayed signal is received.

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