Read the spec sheet and is know where in it.
All available information for the temp diode can be found in the P2020 Datasheet:
3.2 Temperature DiodeThe device has a temperature diode on the microprocessor that can be used in conjunction with other system temperaturemonitoring devices. These devices use the negative temperature coefficient of a diode operated at a constant current todetermine the temperature of the microprocessor and its environment.The following are the specifications of the P2020 on-board temperature diode:Operating range: 10 – 230 μAIdeality factor over 13.5 – 220 μA; n = 1.011 +/- 0.008
It is valid within operating temperature range -40C - +125C
Some helpful information can be found in the AN4787
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