STMicroelectronics STM32WL5 Series User Manual

Power control (PWR) RM0453
228/1450 RM0453 Rev 5
6 Power control (PWR)
6.1 Power supplies
The STM32WL5x devices require a V
DD
operating voltage supply between 1.71 V and
3.6 V. Several independent supplies (V
DDSMPS
, V
FBSMPS
, V
DDA
, V
DDRF
) can be provided for
specific peripherals:
• V
DD
= 1.71 V to 3.6 V
V
DD
is the external power supply for the I/Os, the system analog blocks such as reset,
power management, internal clocks and low-power regulator. It is provided externally
through VDD pins.
• V
DDSMPS
= 1.71 V to 3.6 V
V
DDSMPS
is the external power supply for the SMPS step-down converter. It is provided
externally through VDDSMPS supply pin and must be connected to the same supply as
V
DD
.
• V
FBSMPS
= 1.55 V
V
FBSMPS
is the external power supply for the main system regulator. It is provided
externally through VFBSMPS pin and is supplied through the SMPS step-down
converter.
• V
DDA
= 0 V to 3.6 V (DAC/COMPs minimum voltage is 1.62 V, ADC minimum voltage is
1.8 V and VREFBUF minimum voltage is 2.4 V).
V
DDA
is the external analog power supply for A/D converters, D/A converters, voltage
reference buffer, and comparators. The V
DDA
voltage level is independent from the V
DD
voltage (see power-up and power-down limitations below) and must preferably be
connected to V
DD
when these peripherals are not used.
• V
DDRF
= 1.71 V to 3.6 V
V
DDRF
is the external power supply for the radio. It is provided externally through the
VDDRF pin and must be connected to the same supply as V
DD
.
• V
DDRF1V5
= 1.45 V to 1.62 V
V
DDRF1V5
is the external power supply for the radio. It is provided externally through
the VDDRF1V5 pin.
• V
BAT
= 1.55 V to 3.6 V
V
BAT
is the power supply for RTC, TAMP, external clock 32 kHz oscillator and backup
registers (through power switch) when V
DD
is not present.
• V
REF-, VREF+
V
REF+
is the input reference voltage for ADC. 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 is not active. The internal voltage reference buffer
supports the following output voltages, configured with VRS bit in the VREFBUF_CSR
register:
–V
REF+
around 2.048 V: this requires V
DDA
≥ 2.4 V.
–V
REF+
around 2.5 V: this requires V
DDA
≥ 2.8 V.

STMicroelectronics STM32WL5 Series Specifications

General

Brand	STMicroelectronics
Model	STM32WL5 Series
Category	Microcontrollers
Language	English