Patent ID: 7003424

Claim:
A temperature detection cell comprising: a first temperature circuit for producing a voltage that increases with temperature, said first temperature circuit comprising a first current source for producing a first current that increases with the temperature, and at a given temperature, increases as a function of a received control potential, and a first resistance for receiving the first current and for providing the increasing voltage across its terminals; a second temperature circuit for producing a voltage that decreases with the temperature; a comparison circuit for comparing the increasing voltage with the decreasing voltage, and for producing a warning signal when the temperature reaches a detection threshold such that the decreasing voltage becomes lower than the increasing voltage; and a test circuit for determining the detection threshold and comprising a test current source for producing a test current, and a test resistance for receiving the test current and having a test voltage produced across its terminals at a reference temperature, the test voltage being proportional to the increasing voltage when the control potential has no effect on the first current and the test current produced by said first and test current sources, and being proportional to the decreasing voltage when said first and test current sources are controlled by the control potential such that the increasing voltage is equal to the decreasing voltage at the reference temperature.