Power Control (Pwr); Power Supplies; Independent A/D And D/A Converter Supply And Reference Voltage; Figure 6. Power Supply Overview - STMicroelectronics STM32F05 series Reference Manual

RM0091
6

Power control (PWR)

6.1

Power supplies

The device requires a 2.0 V - 3.6 V operating voltage supply (V
voltage supply (V
power.
The real-time clock (RTC) and backup registers can be powered from the V
the main V
Figure 6.
6.1.1

Independent A/D and D/A converter supply and reference voltage

To improve conversion accuracy and to extend the supply flexibility, the ADC and the DAC
have an independent power supply which can be separately filtered and shielded from noise
on the PCB.
●
The ADC and DAC voltage supply input is available on a separate V
●
An isolated supply ground connection is provided on pin V
The V
DDA
When a single supply is used, V
external filtering circuit in order to ensure a noise free V
). An embedded regulator is used to supply the internal 1.8 V digital
DDA
supply is powered off.
DD
Power supply overview
V
SSA
V
DDA
V
SS
V
DD
V
BAT
supply/reference voltage can be equal or higher than V
Doc ID 018940 Rev 1
V
DDA
A/D converter
D/A converter
Temp. sensor
Reset block
PLL
V domain
DD
I/O Ring
Standby circuitry
(Wakeup logic,
IWDG)
Voltage Regulator
Low voltage detector
Backup domain
LSE crystal 32K osc
BKP registers
RCC BDCR register
RTC
can be externally connected to V
DDA
Power control (PWR)
) and 2.0 V - 3.6 V analog
DD
BAT
domain
1.8 V domain
Core
Memories
digital
peripherals
DDA
.
SSA
.
DD
, through the
DD
/reference voltage.
DDA
voltage when
pin.
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