Patent ID: 8583398

Claim:
A temperature sensing device comprising: a bandgap voltage generator for providing a reference voltage, the bandgap voltage generator comprising a positive temperature coefficient current source; N mirror current sources, control ends of the mirror current sources being coupled to a control end of the positive temperature coefficient current source, so as to mirror N mirror currents based on a positive temperature coefficient current generated by the positive temperature coefficient current source, wherein N is a positive integer; a temperature voltage generator coupled to the mirror current sources, the temperature voltage generator setting a conducting number M of the mirror current sources based on a control signal, so as to generate a temperature voltage, a potential of the temperature voltage being determined based on the conducting number M of the mirror current sources, wherein M is a non-negative integer, and M≦N; and a temperature calculating unit coupled to the bandgap voltage generator and the temperature voltage generator, the temperature calculating unit gradually counting the control signal and comparing a potential of the reference voltage with the potential of the temperature voltage after counting the control signal, so as to calculate and obtain temperature information.