19.1 Overview

The Supply Controller (SUPC) manages the voltage reference, power supply, and supply monitoring of the device. It is also able to control two output pins.

The SUPC controls the voltage regulators for the core (VDDCORE) and backup (VDDBU) domains. It sets the voltage regulators according to the sleep modes, or the user configuration. In active mode, the voltage regulators can be selected on-the-fly between LDO (low-dropout) type regulator or Buck converter.

The SUPC supports connection of a battery backup to the VBAT power pin. It includes functionality that enables automatic power switching between main power and battery backup power. This ensures power to the backup domain when the main battery or power source is unavailable.

The SUPC embeds two Brown-Out Detectors: BOD33 monitors the voltage applied to the device (VDD or VBAT) and BOD12 monitors the internal voltage to the core (VDDCORE). The BOD33 can monitor the supply voltage continuously (continuous mode) or periodically (sampling mode), in normal or low power mode.

The SUPC generates also a selectable reference voltage, which can be used by analog modules such as the ADC and DAC.