Datasheet
DS11585 Rev 9 23/272
STM32L496xx Functional overview
61
3.10 Power supply management
3.10.1 Power supply schemes
• V
DD
= 1.71 to 3.6 V: external power supply for I/Os (V
DDIO1
), the internal regulator and
the system analog such as reset, power management and internal clocks. It is provided
externally through VDD pins.
• V
DD12
= 1.05 to 1.32 V: external power supply bypassing internal regulator when
connected to an external SMPS. It is provided externally through VDD12 pins and only
available on packages with the external SMPS supply option. VDD12 does not require
any external decoupling capacitance and cannot support any external load.
• V
DDA
= 1.62 V (ADCs/COMPs) / 1.8 (DAC/OPAMPs) to 3.6 V: external analog power
supply for ADCs, DAC, OPAMPs, Comparators and Voltage reference buffer. The V
DDA
voltage level is independent from the V
DD
voltage.
• V
DDUSB
= 3.0 to 3.6 V: external independent power supply for USB transceivers. The
V
DDUSB
voltage level is independent from the V
DD
voltage.
• V
DDIO2
= 1.08 to 3.6 V: external power supply for 14 I/Os (PG[15:2]). The V
DDIO2
voltage level is independent from the V
DD
voltage.
• V
LCD
= 2.5 to 3.6 V: the LCD controller can be powered either externally through VLCD
pin, or internally from an internal voltage generated by the embedded step-up
converter.
• V
BAT
= 1.55 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and
backup registers (through power switch) when V
DD
is not present.
Note: When the functions supplied by V
DDA
, V
DDUSB
or V
DDIO2
are not used, these supplies
should preferably be shorted to V
DD
.
Note: If these supplies are tied to ground, the I/Os supplied by these power supplies are not 5 V
tolerant (refer to
Table 19: 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
.
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