ST STM32G473 User Manual

RM0440 Rev 4 229/2126
RM0440 Power control (PWR)
271
6 Power control (PWR)
6.1 Power supplies
The STM32G4 Series devices require a 1.71 V to 3.6 V operating supply voltage (V
DD
).
Analog peripherals are supplied through independent power domain V
DDA
.
• V
DD
= 1.71 V to 3.6 V
V
DD
is the external power supply for the I/Os, the internal regulator and the system
analog such as reset, power management and internal clocks. It is provided externally
through VDD pins.
• V
DDA
= 1.62 V (ADC/ COMP) / 1.71 V (DAC 1MSPS / DAC 15MSPS) / 2 V (OPAMP) /
2.4 V (VREFBUF)
V
DDA
is the external analog power supply for A/D converters, D/A converters, voltage
reference buffer, operational amplifiers and comparators. The V
DDA
voltage level is
independent from the V
DD
voltage. V
DDA
should be preferably connected to V
DD
when
these peripherals are not used.
During power up and power down, the following power sequence is required:
– When V
DD
is below 1 V, then V
DDA
supply must remain below V
DD
+ 300 mV
– When V
DD
is above 1 V, all power supplies became independent.
During power down phase, V
DD
can temporarily become lower then other supplies only
if the energy provided to the MCU remains below 1 mJ. this allows external decoupling
capacitors to be discarged with different time constants during the power down
transient phase.
• V
BAT
= 1.55 V to 3.6 V
V
BAT
is the power supply for RTC, external clock 32 kHz oscillator and backup registers
(through power switch) when V
DD
is not present. VBAT is internally bonded to VDD for
small packages without dedicated pin.
• V
REF-, VREF+
V
REF+
is the input reference voltage for ADCs and DACs. It is also the output of the
internal voltage reference buffer when enabled.
When V
DDA
< 2 V, V
REF+
must be equal to V
DDA
.
When V
DDA
≥ 2 V, V
REF+
must be between 2 V and V
DDA
.
V
REF+
can be grounded when ADC and DAC are not active.
The internal voltage reference buffer supports three output voltages, which are
configured with VRS bit in the VREFBUF_CSR register:
–V
REF+
around 2.048 V. This requires V
DDA
equal to or higher than 2.4 V.
–V
REF+
around 2.5 V. This requires V
DDA
equal to or higher than 2.8 V.
–V
REF+
around 2.9 V. This requires V
DDA
equal to or higher than 3.135 V.
V
REF+
pin is not available on all packages. When not available on the package, it is
bonded to V
DDA
. When the V
REF+
is double-bonded with V
DDA
in a package, the
internal voltage reference buffer (VREFBUF) is not available and must be kept disable
(refer to related device datasheet for packages pinout description).
V
REF-
is internally double bonded with V
SSA
.

ST STM32G473 Specifications

General

Brand	ST
Model	STM32G473
Category	Microcontrollers
Language	English