ST STM32WBA65I-DK1 User Manual page 16

7.2.4 VBUS_STLK
5V_USB_CHGR is the DC power charger connected to the USB STLINK (CN6). A jumper must be set on [7‑8] to
select the 5V_USB_CHARGER power source on the JP4 silkscreen. In this case, if the STM32WBA65I-DK1
Discovery board is powered by an external USB charger, the debug is not available. If a PC is connected instead
of the charger, the limitation is no longer effective and this might damage the PC.
7.2.5 5V_USB_MCU
5V_USB_MCU is the DC power coming from the user USB (CN5) Then, a jumper must be set on [9‑10] to select
the 5V_USB_MCU power source on the JP4 silkscreen. In this case, if the STM32WBA65I-DK1 Discovery board
is powered by a USB charger, the debug is not available. If a PC is connected instead of the charger, then the
limitation is no more effective and that might damage the PC.
Note: If the board is powered by a USB charger, there is no USB enumeration, so the red LED (LD2) remains OFF
permanently.
Caution: Be aware that, if you connect a PC to the ST-LINK connector (CN6), the PC is not protected. The green LED
(LD1) is lit when 5V correctly powers the STM32WBA65I-DK1 Discovery board.
UM3462 - Rev 1
Figure 12. 5V_USB_CHGR selection: JP4 [7-8]
JP4
5V_STLK
1
5V_VIN
3
5V_EXT
5
VBUS_STLK
7
5V_USB_MCU
9
Figure 13. 5V_USB_CHGR selection: JP4 [9-10]
JP4
5V_STLK
1
5V_VIN
3
5V_EXT
5
VBUS_STLK
7
5V_USB_MCU
9
Hardware layout and configuration
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4
6
8
10
2
4
6
8
10
UM3462
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