ST Nucleo-64 STM32WL3 Series User Manual page 11

7.1 Power supply
7.1.1 General description
By default, the STM32WL33CC embedded on this Nucleo board is supplied by 3V3 but the board proposes many
possibilities to supply the module. In fact, at first, the 3V3 can come from ST-LINK USB, ARDUINO
morpho connectors. Moreover, STM32WL33CC can be supplied by an external source (between 1.7 and 3.6 V).
Thanks to level shifters, debugging by embedded ST-LINK is always possible even if the supply voltage of the
target is different than 3V3 (ST-LINK supply).
default state of the jumpers and the solder bridges.
AVDD (CN11-1)
ARDUINO® AVDD (CN6-8)
ST morpho AVDD (CN4-7)
VBUS_STLK
(CN15-A4/A9/B4/B9)
ARDUINO® VIN (CN5-8)
ST morpho VIN (CN3-24)
External (CN10-1)
SB33
ST morpho 5V_EXT (CN3-6)
ON
5V_USB MCU (CN9 if mounted)
5V_USB MCU (CN4-8)
* OVCP: Overvoltage and current protection
7.1.2 7 to 12 V power supply
A 7 to 12 V DC power source can power NUCLEO-WL33CCx. There are three connectors available for this
configuration:
• Pin VIN of the ARDUINO
ARDUINO
• Pin VIN of the ST morpho connector (CN3-24). It is possible to apply up to +12 V on this pin like for the
ARDUINO
• External input (CN10). Be careful, in this case, the states of the jumpers and solder bridge are significant.
Verify these states in
These sources are connected to a linear low‑drop voltage regulator (U3). The output of this regulator is a potential
source of the 5V signal. For further details, refer to the next section.
UM3418 - Rev 1
Figure 7. NUCLEO-WL33CCx power tree
U11 U5
3V3_STLK
LDO_3V3 STM32F7
U10
JP1 [1-2]
5V_STLK
OVCP*_5V
ON
JP1 [9-10]
VBUS_STLK
OFF
U3
JP1 [5-6]
LDO_5V
OFF
SB20
5V
OFF
SB21 JP1 [7-8]
ON OFF
SB22
OFF
JP1 [3-4]
OFF
®
connector (CN5-8). It is possible to apply up to +12 V on this pin or use an
®
shield, which can deliver this type of voltage.
®
connection.
Table 12. SB20 must be ON.
Figure 7 shows the power tree. Moreover, this figure also shows the
MB1801
20
VDDA
VDD
17
VDD
18
VDD
VDD
32
3V3
U4
LDO_3V3
SW1
4
V_Target
Hardware layout and configuration
®
, or ST
MB2029
3
VDD_1
21
VDD_2
STM32WL33CC
27
VDDRF
37
VDDSD
UM3418
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