Patent ID: 7029171

Claim:
A digital integrated circuit temperature sensor comprising: an analog-to-digital converter providing a binary word representative of a temperature internal to the integrated circuit; a generating circuit for providing an analog voltage representative of the circuit temperature and for generating a reference voltage for the analog-to-digital converter; and a calibration circuit providing respective high and low conversion thresholds to the converter, the low voltage corresponding to said reference voltage, said calibration circuit comprising: a first operational amplifier having a non-inverting input receiving said reference voltage and having its output providing said high conversion threshold, the non-inverting input of the first amplifier being connected to the junction point of two variable resistive elements series-connected between the output terminal of the first amplifier and a supply reference potential; and a second operational amplifier having an inverting input terminal receiving the analog voltage depending on temperature and having a non-inverting input connected to the midpoint of two resistive elements series-connected between the output terminal of said second operational amplifier and said supply reference potential, the second operational amplifier providing an amplified voltage to be converted by said analog-to-digital converter.