ST STM32F301 6 Series Reference Manual page 76

Power control (PWR)
The following supply voltages are available:
• V
DD
These supply voltages are provided externally through V
3.6 V(STM32F301x6/8 devices) or 1.8 V ± 8% (STM32F318x8 devices).
When the 1.8 V mode external supply is selected, V
output, which directly drives the VDD18 domain.
V
DD
•
VDD18 = 1.65 to 1.95 V (VDD18 domain): power supply for digital core, SRAM, and
flash memory.
VDD18 is either internally generated through an internal voltage regulator
(STM32F301x6/8) or can be provided directly from the external V
regulator is bypassed (STM32F318x8).
•
V
DDA
power supply for ADC, DAC, comparators, operational amplifiers, temperature sensor,
PLL, HSI 8 MHz oscillator, LSI 40 kHz oscillator, and reset block.
V
DDA
V
DDA
It is forbidden to have V
between V
•
V
BAT
backup registers when V
power switch switches the backup power to V
connected to V
76/874
Figure 7. Power supply overview (STM32F318xx devices)
V
DDA
V
SSA
V
DDIO
V
DD
V
SS
NPOR
V
BAT
and V : external power supply for I/Os and core.
SS
must always be kept lower than or equal to V
, V = 2.0 to 3.6 V (STM32F301x6/8) or 1.65 to 3.6 V (STM32F318x8): external
SSA
must be in the 2.4 to 3.6 V range when the OPAMP and DAC are used.
must be in the 1.8 to 3.6 V range when the ADC is used.
DDA
and V to guarantee that this condition is met.
DD DDA
= 1.65 to 3.6 V: Backup power supply for RTC, LSE oscillator, PC13 to PC15 and
DD
.
DD
V domain
DDA
A/D converter
D/A converter
Temp. sensor
Reset block
PLL
1.8 V domain
V domain
DD
I/O ring
Wakeup logic,
IWDG
Backup domain
LSE crystal 32K osc
BKP registers
RCC BDCR register
RTC
< V - 0.4 V. An external Schottky diode must be placed
DD
is not present. When a V
DD
RM0366 Rev 5
Core
Memories
Digital
peripherals
and V pins. V
DD SS
directly supplies the regulator
DD
.
DDA
DD
supply is present, the internal
DD
. If V is not used, it must be
BAT
RM0366
MSv34220V1
= 2.0 to
DD
pin when the