Patent ID: 7880528

Claim:
A temperature detection circuit, comprising: a first temperature sensor circuit that outputs a first output voltage according to a temperature, the first temperature sensor circuit having a first constant current source and a first temperature sensor element connected between a positive power supply terminal and a negative power supply terminal; a second temperature sensor circuit that outputs a second output voltage according to the temperature, the second temperature sensor circuit having a second temperature sensor element and a second constant current source connected between the positive power supply terminal and the negative power supply terminal; a switch circuit that conducts a switching operation in accordance with a control signal to switch between the first temperature sensor circuit and the second temperature sensor circuit to output the first output voltage and the second output voltage, respectively; a reference voltage circuit that outputs a reference voltage; a comparison circuit that compares the reference voltage from the reference voltage circuit with the first output voltage or the second output voltage that is output in accordance with the switching operation by the switch circuit; and a logic circuit to which the control signal and an output signal from the comparison circuit are input and that outputs a detection signal that is inverted on the basis of the control signal in a range in which the output signal from the comparison circuit is effective.