ST STM32WL55JC Reference Manual page 218

Power control (PWR)
6 Power control (PWR)
6.1 Power supplies
The STM32WL5x devices require a V
3.6 V. Several independent supplies (V
specific peripherals:
•
V
DD
V
DD
power management, internal clocks and low-power regulator. It is provided externally
through VDD pins.
•
V
DDSMPS
V
DDSMPS
externally through VDDSMPS supply pin and must be connected to the same supply as
V
DD
•
V
FBSMPS
V
FBSMPS
externally through VFBSMPS pin and is supplied through the SMPS step-down
converter.
•
V
DDA
1.8 V and VREFBUF minimum voltage is 2.4 V).
V
DDA
reference buffer, and comparators. The V
voltage (see power-up and power-down limitations below) and must preferably be
connected to V
•
V
DDRF
V
DDRF
VDDRF pin and must be connected to the same supply as V
•
V
DDRF1V5
V
DDRF1V5
the VDDRF1V5 pin.
• V
BAT
V
BAT
registers (through power switch) when V
•
V
REF-
V
REF+
reference buffer when enabled.
–
–
V
REF+
supports the following output voltages, configured with VRS bit in the VREFBUF_CSR
register:
–
–
218/1454
= 1.71 V to 3.6 V
is the external power supply for the I/Os, the system analog blocks such as reset,
= 1.71 V to 3.6 V
is the external power supply for the SMPS step-down converter. It is provided
.
= 1.55 V
is the external power supply for the main system regulator. It is provided
= 0 V to 3.6 V (DAC/COMPs minimum voltage is 1.62 V, ADC minimum voltage is
is the external analog power supply for A/D converters, D/A converters, voltage
when these peripherals are not used.
DD
= 1.71 V to 3.6 V
is the external power supply for the radio. It is provided externally through the
= 1.45 V to 1.62 V
is the external power supply for the radio. It is provided externally through
= 1.55 V to 3.6 V
is the power supply for RTC, TAMP, external clock 32 kHz oscillator and backup
, V
REF+
is the input reference voltage for ADC. It is also the output of the internal voltage
When V < 2 V, V
DDA REF+
When V ≥ 2 V, V
DDA REF+
can be grounded when ADC is not active. The internal voltage reference buffer
V around 2.048 V: this requires V
REF+
V around 2.5 V: this requires V
REF+
operating voltage supply between 1.71 V and
DD
, V
DDSMPS FBSMPS
voltage level is independent from the V
DDA
is not present.
DD
must be equal to V
must be between 2 V and V
≥ 2.4 V.
DDA
≥ 2.8 V.
DDA
RM0453 Rev 2
, V , V ) can be provided for
DDA DDRF
.
DD
.
DDA
.
DDA
RM0453
DD