RTFM:
2.12 THERMAL SENSING PINS (THERM1, THERM0)
THERM1 and THERM0 are connected to an internal thermal resistor and provide information about the average temperature of the die. The resistance across these two pins is proportional to the average temperature of the die. The temperature coefficient of the resistor is approximately 1.2 Ω/°C with a nominal resistance of 400 Ω at 25°C.
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