26.6.2 Voltage References
The reference voltages are generated by a functional analog block controlled by the SUPC. It is providing a fixed-voltage source VREF for modules as ADC and AC as well as a temperature dependent voltage in support of a temperature sensor.
Initialization
After reset, the voltage reference output is enabled and running at full power mode, and the temperature sensor is disabled.
Enabling, Disabling, and Resetting
The temperature sensor is enabled/disabled by setting/clearing the Temperature Sensor Enable bit in the Voltage Reference register (VREFCTRL.TSEN).