ST STM32F101 series Reference Manual

DocID13902 Rev 15 68/1128
RM0008 Power control (PWR)
80
Figure 4. Power supply overview
1. V
DDA
and V
SSA
must be connected to V
DD
and V
SS
, respectively.
5.1.1 Independent A/D and D/A converter supply and reference voltage
To improve conversion accuracy, 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
DDA
pin.
• An isolated supply ground connection is provided on pin V
SSA
.
When available (according to package), V
REF-
must be tied to V
SSA
.
On 100-pin and 144-pin packages
To ensure a better accuracy on low-voltage inputs and outputs, the user can connect a
separate external reference voltage on V
REF+
. V
REF+
is the highest voltage, represented by
the full scale value, for an analog input (ADC) or output (DAC) signal. The voltage on V
REF+
can range from 2.4 V to V
DDA
.
On 64-pin packages and packages with less pins
The V
REF+
and V
REF-
pins are not available, they are internally connected to the ADC
voltage supply (V
DDA
) and ground (V
SSA
).
A/D converter
V
DDA
V
DD
V
SSA
V
REF+
V
BAT
V
SS
I/O Ring
(V
DD
)
(from 2.4 V up to V
DDA
)
BKP registers
Temp. sensor
Reset block
Standby circuitry
PLL
(Wakeup logic,
IWDG)
RTC
Voltage Regulator
Core
Memories
digital
peripherals
Low voltage detector
V
REF-
V
DDA
domain
V
DD
domain
1.8 V domain
Backup domain
LSE crystal 32K osc
RCC BDCR register
(V
SSA
)
(V
SS
)
D/A converter

ST STM32F101 series Specifications

General

Brand	ST
Model	STM32F101 series
Category	Computer Hardware
Language	English