All available information for the temp diode can be found in the P2020 Datasheet:
3.2 Temperature Diode
The device has a temperature diode on the microprocessor that can be used in conjunction with other system temperature
monitoring devices. These devices use the negative temperature coefficient of a diode operated at a constant current to
determine the temperature of the microprocessor and its environment.
The following are the specifications of the P2020 on-board temperature diode:
Operating range: 10 – 230 μA
Ideality factor over 13.5 – 220 μA; n = 1.011 +/- 0.008
It is valid within operating temperature range -40C - +125C
