A circuit for providing a digital value (VABS) for an analog signal (vin) to be digitized, the circuit comprising: - a single A/D convertor having a reference port (Rp) for receiving a reference voltage (vref), and an input port (Ip) for receiving an analog voltage (vin) to be digitized; - a controller adapted for: a) applying a first reference signal (vptat) having a positive temperature coefficient to the input port of the A/D convertor while applying a reference voltage (vref) to the reference port of the A/D convertor, and obtaining a first digital reference value (VPTAT) from the A/D convertor; b) applying a second reference signal (vbe) having a negative temperature coefficient to the input port (ip) of the A/D convertor while applying the same reference voltage (vref) as was used in step a) to the reference port of the A/D convertor, and obtaining a second digital reference value from the A/D convertor; c) applying the analog signal to be measured (vin) or a signal (vin') derived therefrom to the input port of the A/D convertor while applying the same reference voltage (vref) as was used in step a) to the reference port of the A/D convertor, and obtaining a raw digital signal value from the A/D convertor; d) calculating the digital value (Vabs) for the analog signal (vin) to be digitized in the digital domain in accordance with the following formula: VABS = C ∗ VIN / α ∗ VPTAT + VBE wherein VABS is a digital representation of the absolute voltage of the analog signal (vin) to be digitized, VPTAT is the first digital reference value, and VBE is the second digital reference value, and VIN is the raw digital signal value, and α and C are predetermined constants. - a single A/D convertor having a reference port (Rp) for receiving a reference voltage (vref), and an input port (Ip) for receiving an analog voltage (vin) to be digitized; - a controller adapted for: a) applying a first reference signal (vptat) having a positive temperature coefficient to the input port of the A/D convertor while applying a reference voltage (vref) to the reference port of the A/D convertor, and obtaining a first digital reference value (VPTAT) from the A/D convertor; b) applying a second reference signal (vbe) having a negative temperature coefficient to the input port (ip) of the A/D convertor while applying the same reference voltage (vref) as was used in step a) to the reference port of the A/D convertor, and obtaining a second digital reference value from the A/D convertor; c) applying the analog signal to be measured (vin) or a signal (vin') derived therefrom to the input port of the A/D convertor while applying the same reference voltage (vref) as was used in step a) to the reference port of the A/D convertor, and obtaining a raw digital signal value from the A/D convertor; d) calculating the digital value (Vabs) for the analog signal (vin) to be digitized in the digital domain in accordance with the following formula: VABS = C ∗ VIN / α ∗ VPTAT + VBE wherein VABS is a digital representation of the absolute voltage of the analog signal (vin) to be digitized, VPTAT is the first digital reference value, and VBE is the second digital reference value, and VIN is the raw digital signal value, and α and C are predetermined constants. a) applying a first reference signal (vptat) having a positive temperature coefficient to the input port of the A/D convertor while applying a reference voltage (vref) to the reference port of the A/D convertor, and obtaining a first digital reference value (VPTAT) from the A/D convertor; b) applying a second reference signal (vbe) having a negative temperature coefficient to the input port (ip) of the A/D convertor while applying the same reference voltage (vref) as was used in step a) to the reference port of the A/D convertor, and obtaining a second digital reference value from the A/D convertor; c) applying the analog signal to be measured (vin) or a signal (vin') derived therefrom to the input port of the A/D convertor while applying the same reference voltage (vref) as was used in step a) to the reference port of the A/D convertor, and obtaining a raw digital signal value from the A/D convertor; d) calculating the digital value (Vabs) for the analog signal (vin) to be digitized in the digital domain in accordance with the following formula: VABS = C ∗ VIN / α ∗ VPTAT + VBE wherein VABS is a digital representation of the absolute voltage of the analog signal (vin) to be digitized, VPTAT is the first digital reference value, and VBE is the second digital reference value, and VIN is the raw digital signal value, and α and C are predetermined constants.