Figure 9. Jp6 [1-2]: 5V_Stlk Power Source - ST STM32U5 User Manual

5V_STLK is a 5V DC power with limitations from the STLINK-V3E USB connector (CN1). In this case, the 5V
jumper selection (JP6) must be on pin [1-2] to select the 5V_STLK power source on the JP6 connector. This is the
default setting. If the USB enumeration succeeds, the 5V_STLK power is enabled, by asserting the T_PWR_EN
signal from STLINK-V3E. This pin is connected to a power switch (U2) with the management of the maximum
current delivery.
The STM32U5 Nucleo-144 board and its shield can be powered from the STLINK-V3E USB connector (CN1), but
only the STLINK-V3E circuit is powered before USB enumeration because the host PC only provides 100 mA to
the board at that time. During the USB enumeration, the STM32U5 Nucleo-144 board requests 500 mA power to
the host PC.
• If the host can provide the required power, the U2 power switch is enabled, the green LED (LD5) is turned
ON, and the STM32U5 Nucleo-144 board and its shield can consume up to 500 mA.
• If the host is not able to provide the requested current, the enumeration fails. the U2 power switch remains
OFF and the MCU part including the extension board is not powered. As a consequence, the green LED
(LD5) remains OFF. In this case, it is recommended to use an external power supply.
5V_STLK configuration: 5V jumper selection JP6[1-2] must be connected as shown in
UM2861 - Rev 5
Figure 9. JP6 [1-2]: 5V_STLK power source
UM2861
Power supply and power selection
Figure 9.
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