Hardware layout and configuration
UM2140
18/48
UM2140 Rev 3
5.4.4
Supplying the board from an external power supply through USB HS
A 5 V DC external power supply is connected to the CN19 USB OTG HS Micro-AB
connector (5 V power source on USB_HS silkscreen, refer to
).
Figure 11. CN8 external USB_HS supply
5.4.5
Supplying the board from an external power supply through USB FS
A 5 V DC external power supply is connected to USB OTG FS Micro-AB connector CN18
(5 V power source on USB_FS silkscreen, refer to
).
Figure 12. CN8 external USB_FS supply
5.5 Programming/debugging
when
the power supply is not from
ST-LINK
It is mandatory to power the board first using CN3 E5V, or CN12 VIN, or CN18 USB FS, or
CN19 USB_HS, then connect the USB cable to the PC. Proceeding this way ensures that the
enumeration succeeds thanks to the external power source.
The following power sequence procedure must be respected:
MSv44319V1
USB HS
MSv44320V1
USB F
S
