ST Nucleo-64 STM32U3 User Manual page 22

CHGR is when a DC power charger is connected to the USB STLINK-V3EC (CN1). To select the CHGR power
source, the 5V jumper selection (JP3) must be on pins [7-8]. If an external USB charger powers the Nucleo-64
board, then the debugging feature through (CN1) is not available. With this configuration, the voltage and current
limitations are no longer effective. If a host computer is connected instead of the charger, it is recommended to
select the STLK power source.
CHGR configuration: 5V jumper selection JP3[7-8] must be connected as shown in
Note: With this JP3 configuration: the USB_PWR protection is bypassed. This configuration is forbidden to power the
board with a computer USB port, as the USB_PWR_protection is bypassed. The reason is that if the board
consumes more than 500 mA, it can damage the computer.
UM3062 - Rev 2
Figure 13. 5V jumper selection JP3[7-8]: CHGR power source
STM32
microcontroller
UM3062
Hardware layout and configuration
Figure 13.
USB STLINK-V3EC
(CN1)
5V LED
(LD3)
CHGR selection
(JP3 [7-8])
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