Power Supplies Of The Stm32F05Xxx Family; Power Supply Schemes - ST STM32F0 Series Application Note

Power supplies of the STM32F05xxx family

1 Power supplies of the STM32F05xxx family
1.1

Power supply schemes

There are a variety of power supply schemes:
●
V
DD
Provided externally through V
●
V
DDA
HSI14, LSI and PLL (minimum voltage to be applied to V
and DAC are used).
The V
and must be provided first.
●
V
BAT
(through power switch) when V
Figure 1.
+ 1 × 4.7 μF
V DDA
10 nF
+ 1 μF
4/29
= 2.0 to 3.6 V: external power supply for I/Os and the internal regulator.
= 2.0 to 3.6 V: external analog power supply for ADC/DAC, Reset blocks, HSI,
voltage level must always be greater than or equal to the V
DDA
= 1.65 to 3.6 V: power supply for RTC, LSE 32 kHz oscillator and backup registers
Power supply scheme
V BAT
1.65 -3.6V
GP I/Os
V DD
2 ×
V DD
2 × 100 nF
2 × V SS
V DDA
V SSA
Doc ID 023035 Rev 2
pins.
DD
is not present.
DD
Po wer swi tch
OUT
IO
Logic
IN
Regulator
V REF+
ADC/
DAC
V REF-
is 2.4 V when the ADC
DDA
voltage level
DD
Backup circuitry
(LSE,RTC,
Backup registers)
Kernel logic
(CPU,
Digital
& Memories)
Analog:
RCs, PLL,
...
MS19875V2
AN4080