Datasheet
Functional overview STM32L476xx
22/270 DS10198 Rev 8
Note: If these supplies are tied to ground, the I/Os supplied by these power supplies are not 5 V
tolerant (refer to
Table 20: Voltage characteristics).
Note: V
DDIOx
is the I/Os general purpose digital functions supply. V
DDIOx
represents V
DDIO1
or
V
DDIO2
, with V
DDIO1
= V
DD
. V
DDIO2
supply voltage level is independent from V
DDIO1
.
Figure 2. Power supply overview
During power-up and power-down phases, the following power sequence requirements
must be respected:
• When V
DD
is below 1 V, other power supplies (V
DDA
, V
DDUSB
, V
DDIO2
, V
LCD
) must
remain below V
DD
+ 300 mV.
• When V
DD
is above 1 V, all power supplies are independent.
During the power-down phase, V
DD
can temporarily become lower than other supplies only
if the energy provided to the MCU remains below 1
mJ; this allows external decoupling
capacitors to be discharged with different time constants during the power-down transient
phase.
MSv45700V1
Low voltage detector
V
DDA
V
DDA
domain
V
SS
V
DD
V
BAT
3 x A/D converters
2 x comparators
2 x D/A converters
2 x operational amplifiers
Voltage reference buffer
V
DD
domain
I/O ring
V
SSA
Reset block
Temp. sensor
3 x PLL, HSI, MSI
Standby circuitry
(Wakeup logic, IWDG)
Voltage regulator
V
DDIO1
LSE crystal 32 K osc
BKP registers
RCC BDCR register
RTC
Backup domain
Core
SRAM1
SRAM2
Digital peripherals
V
CORE
domain
V
CORE
LCD
V
LCD
USB transceivers
V
DDUSB
V
SS
V
DDIO2
domain
I/O ring
V
DDIO2
V
SS
PG[15:2]
Flash memory
V
DD12
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