ST STM32F301 6 Series Reference Manual page 75

RM0366
6 Power control (PWR)
6.1 Power supplies
An internal regulator is embedded in the STM32F3xx devices.
•
The internal regulator is enabled in the STM32F3xx MCUs:
The STM32F301x6/8 devices require a 2.0 V - 3.6 V operating supply voltage (V
and a 2.0 V - 3.6 V analog supply voltage (V
supply the internal 1.8 V digital power.
•
The internal regulator is disabled in the STM32F318 MCUs:
The STM32F318x8 devices require a 1.8 V +/- 8% operating voltage supply (V
1.65 V - 3.6 V analog voltage supply (V
directly supplies the regulator output.
The real-time clock (RTC) and backup registers can be powered from the V
when the main V supply is powered off.
DD
Figure 6. Power supply overview (STM32F301xx devices)
VSSA
V DDA
I/O ring
VSS
VDD
Voltage regulator
Low voltage detector
RTC domain
LSE crystal 32K osc
VBAT
BKP registers
RCC BDCR register
RTC
RM0366 Rev 5
). The embedded regulator is used to
DDA
). The embedded regulator is OFF and V
DDA
VDDA domain
A/D converter
D/A converter
Temp. sensor
Reset block
PLL
RCs
OPAMP
Comparators
VDD domain 1.8 V domain
Core
Memories
Standby circuitry
Digital
(Wakeup logic,
peripherals
IWDG)
Power control (PWR)
)
DD
) and
DD
DD
voltage
BAT
MS19668V2
75/874
89