ST STM32L4+ Series Reference Manual page 184

Power control (PWR)
5.1.1 Independent analog peripherals supply
To improve ADC and DAC conversion accuracy and to extend the supply flexibility, the
analog peripherals have an independent power supply which can be separately filtered and
shielded from noise on the PCB.
•
The analog peripherals voltage supply input is available on a separate V
•
An isolated supply ground connection is provided on V
The V
DDA
before enabling any of the analog peripherals supplied by V
converter, comparators, operational amplifiers, voltage reference buffer).
The V
DDA
with two thresholds (1.65 V for PVM3 or 2.2 V for PVM4), refer to
Voltage Monitoring (PVM)
When a single supply is used, V
external filtering circuit in order to ensure a noise-free V
184/2301
Figure 10. STM32L4S9xx/L4R9xx power supply overview
V
DDA
V
SSA
V
DDUSB
V
SS
V
DDIO2
V
SS
V
DDDSI
V
CAPDSI
V
DD12DSI
V
SS
V
DD
2 x V
DD12
V
BAT
supply voltage can be different from V
supply can be monitored by the Peripheral Voltage Monitoring, and compared
for more details.
V domain
DDA
1 x A/D converter
2 x comparators
2 x D/A converters
2 x operational amplifiers
Voltage reference buffer
USB transceivers
V domain
DDIO2
V
DDIO2
I/O ring
PG[15:2]
DSI
voltage regulator
DSI PHY
V domain
DD
V
DDIO1
I/O ring
Reset block
Temp. sensor
3 x PLL, HSI, MSI
Standby circuitry
(Wakeup logic,
IWDG)
V
Voltage regulator
Low voltage detector
Backup domain
LSE crystal 32 K osc
BKP registers
RCC BDCR register
RTC
. The presence of V
DD
can be externally connected to V
DDA
RM0432 Rev 6
V domain
CORE
Core
SRAM1
SRAM2
SRAM3
Digital
CORE
peripherals
Flash memory
pin.
SSA
must be checked
DDA
(A/D converter, D/A
DDA
Section 5.2.3: Peripheral
through the
DD
reference voltage.
DDA
RM0432
MSv43405V2
pin.
DDA