Power Controller (Pwr); Power Supplies; Figure 9. Power Supply Overview For Stm32F405Xx/07Xx And Stm32F415Xx/17Xx - ST STM32F405 Reference Manual

Power controller (PWR)

5 Power controller (PWR)
This section applies to the whole STM32F4xx family, unless otherwise specified.
5.1

Power supplies

The device requires a 1.8 to 3.6 V operating voltage supply (V
voltage regulator is used to supply the internal 1.2 V digital power.
The real-time clock (RTC), the RTC backup registers, and the backup SRAM (BKP SRAM)
can be powered from the V
Note: Depending on the operating power supply range, some peripheral may be used with limited
functionality and performance. For more details refer to section "General operating
conditions" in STM32F4xx datasheets.

Figure 9. Power supply overview for STM32F405xx/07xx and STM32F415xx/17xx

VBAT =
1.65 to 3.6V
15 × 100 nF
+ 1 × 4.7 μF
VDD
100 nF
+ 1 μF
1. V and V must be connected to V
DDA SSA
116/1749
BAT
VBAT
GPIOs
VCAP_1
VCAP_2
2 × 2.2 μF
VDD
VDD
1/2/...14/15
VSS
1/2/...14/15
BYPASS_REG
PDR_ON
VDDA
VREF
VREF+
100 nF
VREF-
+ 1 μF
VSSA
and V
DD SS
voltage when the main V
Power
switch
OUT
IO
Logic
IN
Voltage
regulator
Reset
controller
Analog:
RCs,
ADC
PLL,..
, respectively.
RM0090 Rev 18
). An embedded linear
DD
supply is powered off.
DD
Backup circuitry
(OSC32K,RTC,
Wakeup logic
Backup registers,
backup RAM)
Kernel logic
(CPU, digital
& RAM)
Flash memory
RM0090
MS19911V2