ST Nucleo-64 STM32U3 User Manual page 18

7.4 Power supply and power selection
7.4.1 External power supply input
It is possible to configure the Nucleo-64 board to use any of the following power sources:
• STLK: 5 V from STLINK-V3EC USB-C
• VIN: 7 to 12 V from ARDUINO
• E5V: External 5 V power from ST morpho connector (CN7)
• CHGR: 5 V from STLINK-V3EC USB (CN1) without USB enumeration
• USB_USER: 5 V from user USB Type-C
• 3V3 on ARDUINO
Note: If VIN, E5V, or 3V3 is used to power a Nucleo-64 board, this power source must comply with the EN
62368-1:2014+A11:2017 standard and be safety extralow voltage (SELV) with limited power capability.
The power supply capabilities are summarized in
Input power name
STLK
VIN/VIN_5V
E5V
CHGR
USB_USER
3V3
VDD
UM3062 - Rev 2
®
connector (CN1)
®
(CN6) or ST morpho connector (CN7), with 5 V adaptation from LDO (U16)
®
connector (CN3)
®
(CN6) or ST morpho connector (CN7).
Table 7. Power sources capability
Connector pins Voltage range
CN1
4.75 to 5.5 V
JP3[1-2]
CN6 pin 8
CN7 pin 24 7 to 12 V
JP3[3-4]
CN7 pin 6
4.75 to 5.5 V
JP3[5-6]
CN1 pin 1
4.75 to 5.5 V
JP3[7-8]
CN3
4.75 to 5.5 V
JP3[9-10]
CN6 pin 4
3.0 to 3.6 V
CN7 pin 16
JP5 pin 2 1.71 to 3.6 V
Table 7.
Max.
current
The maximum current depends on the presence or
absence of USB enumeration:
500 mA
• 100 mA without enumeration
• 500 mA with enumeration OK.
From 7 to 12 V only and input current capability is
linked to input voltage:
• 800 mA input current when VIN = 7 V
800 mA
• 450 mA input current when 7 V < VIN < 9 V
250 mA input current when 9 V < VIN < 12 V
The maximum current depends on the power
1 A source. 1 A maximum is recommended for this
Nucleo-64 board.
The maximum current depends on the used wall
500 mA charger to power the Nucleo-64 board. No USB
enumeration.
The maximum current depends on the USB Host
1 A used to power the Nucleo-64 board. 1 A maximum
is recommended for this Nucleo-64 board.
The maximum current depends on the 3V3 source.
The 3V3 can be used when the STLINK-V3EC part
-
of the PCB is not used. SB8 might be OFF to
protect LDO (U15).
It is possible to power only the MCU power supply
pins by applying a voltage source on JP5 pin 2. In
this case, only the MCU is power. External
- functions like debugging, LED, or expansion
connectors are not powered. This option can be
used for the MCU power consumption
measurement.
UM3062
Hardware layout and configuration
Limitation
page 18/47