22.2 Features

  • Voltage Regulator System
    • Main voltage regulator: LDO or Buck Converter in active mode (MAINVREG)
    • Low Power voltage regulator in standby mode (LPVREG)
    • Backup voltage regulator for backup domains
    • Adjustable VDDCORE to the sleep mode or the performance level
    • Controlled VDDCORE voltage slope when changing VDDCORE
  • Battery Backup Power Switch
    • Automatic switching from main power to battery backup power
      • Automatic entry to backup mode when switched to battery backup power
    • Automatic switching from battery backup power to main power
      • Automatic exit from backup mode when switched back to main power
      • Stay in backup mode when switched back to main power
    • Main power request upon wake-up sources from backup mode
  • Voltage Reference System
    • Reference voltage for ADC
  • 3.3V Brown-Out Detector (BOD33)
    • Programmable threshold
    • Threshold value loaded from NVM User Row at startup
    • Triggers resets, interrupts, or Battery Backup Power Switch. Action loaded from NVM User Row
    • Operating modes:
      • Continuous mode
      • Sampled mode for low power applications with programmable sample frequency
    • Hysteresis value from Flash User Calibration
    • Monitor VDD or VBAT
  • 1.2V Brown-Out Detector (BOD12)
    • Internal non-configurable Brown-Out Detector
  • Output pins
    • Pin toggling on RTC event