Power Control (Pwr); Power Supplies; Independent A/D Converter Supply And Reference Voltage; Figure 3. Power Supply Overview - ST STM32F101 Series Reference Manual

RM0008
3

Power control (PWR)

3.1

Power supplies

The device requires a 2.0-to-3.6 V operating voltage supply (V
is used to supply the internal 1.8 V digital power.
The real-time clock (RTC) and backup registers can be powered from the V
the main V
Figure 3.
(from 2 V up to V
Note: 1 V and V
DDA
3.1.1

Independent A/D converter supply and reference voltage

To improve conversion accuracy, the ADC has an independent power supply which can be
separately filtered and shielded from noise on the PCB.
The ADC voltage supply input is available on a separate V
An isolated supply ground connection is provided on pin V
When available (according to package), V
supply is powered off.
DD
Power supply overview
(V )
V
SSA
REF-
) V
REF+
DDA
V
DDA
(V )
DD
V
SSA
V
SS
(3.3 V)
V
DD
(V )
V
DD
BAT
must be connected to V
SSA
V domain
DDA
A/D 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
and V , respectively.
DD SS
must be tied to V
REF-
Power control (PWR)
). An embedded regulator
DD
voltage when
BAT
1.8 V domain
Core
Memories
digital
peripherals
pin.
DDA
.
SSA
.
SSA
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