Hardware layout and configuration UM1907
16/49 DocID027942 Rev 3
6.7 USB OTG FS
The STM32F746G-DISCO discovery board supports USB OTG full speed communication
via a USB micro-AB connector (CN13) and USB power switch (U6) connected to VBUS.
The discovery board can be powered by this USB connection at 5V DC with 500mA current
limitation.
A green LED LD5 will be lit in one of these cases:
• Power switch (U6) is ON and STM32F746G-DISCO works as an USB host
• VBUS is powered by another USB host when STM32F746G-DISCO works as an USB
device.
The red LED LD6 will be lit when an overcurrent occurs.
Note: STM32F746G-DISCO board should be powered by an external power supply when using
OTG function.
6.8 USB OTG HS
The STM32F746G-DISCO discovery board supports the USB OTG high speed
communication via a USB micro-AB connector (CN12), USB high speed PHY (U15)
USB3320C-EZK from MICROCHIP for high speed function.
The discovery board can be powered by the USB connectors (CN12) at 5V DC with 500mA
current limitation.
A USB power switch (U7) is also connected on VBUS and provides power to CN12.
The green LED LD4 will be lit in one of these cases:
• Power switch (U17) is ON and STM32F746G-DISCO works as an USB host
• VBUS is powered by another USB host when STM32F746G-DISCO works as an USB
device.
The red LED LD3 will be lit when an overcurrent occurs.
Note: STM32F746G-DISCO board should be powered by an external power supply when using
OTG function.
6.9 microSD card
The 2-Gbyte (or more) microSD card connected to the SDMMC1 port of the
STM32F746NGH6 is supported by the board.
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