The Evaluation board can be powered by these USB connectors (CN14 or CN16) at 5 V DC with 500 mA current
limitation.
As several OTG1_FS signals are shared with the OTG1_HS ULPI bus and USART1, some PCB reworks are
needed when using OTG1_FS (CN16) as shown in
.
Table 11.
USB OTG1 and USART1 function configuration
Function
Mount
Remove
OTG1_HS-CN14 (Default)
R104,R105,SB27,SB30
R254,SB48,SB28,SB29
OTG1_FS-CN16
R254,SB48,SB28,SB29
SB47,SB49
R104,R105,SB27,SB30, SB46,SB51
USART1 (Default)
SB46,SB51
SB47,SB49
A USB power switch (U14) is also connected on V
BUS
and provides power to either CN14 (with SB27 and SB30
ON and SB28 and SB29 OFF) or CN16 (with SB28 and SB29 ON and SB27 and SB30 OFF).
Green LED LD5 (for CN14) or LD7 (for CN16) lights up in one of these cases:
•
Power switch (U14) is ON and the STM32H7x7I-EVAL board works as a USB host.
•
V
BUS
is powered by another USB host when the STM32H7x7I-EVAL board works as a USB device.
The red LED LD6 lights up when an overcurrent occurs (I
VBUS
> 500 mA).
Note:
The STM32H7x7I-EVAL board should be powered by an external power supply when using OTG function.
6.10
USB OTG2_FS
The STM32H7x7I-EVAL Evaluation board supports USB OTG2 full-speed communication through a USB Micro-
AB connector (CN18) and USB power switch (U18) connected to V
BUS
. The Evaluation board can be powered by
this USB connection at 5 V DC at a current up to 500 mA.
A green LED (LD10) lights up if either one of the following events occurs:
•
Power switch (U18) is ON and the STM32H7x7I-EVAL board works as a USB host.
•
V
BUS
is powered by another USB host when the STM32H7x7I-EVAL board works as a USB device.
The red LED (LD8) lights up when an overcurrent occurs (I
VBUS
> 500 mA).
Note:
The STM32H7x7I-EVAL board must be powered by an external power supply when using the OTG function.
Note:
JP2 and SB50 must be removed when using USB OTG_FS as mentioned in
Table 13. CAN related jumpers and
Note:
.
6.11
RS232
Communication through RS232 is supported by the D-type, 9-pins connector CN2, which is connected to the
USART1 of the STM32H7x7XI on the STM32H7x7I-EVAL Evaluation board. The signals Bootloader_RESET and
Bootloader_BOOT0 are added on the RS232 connector CN2 for ISP support.
The USART1 of the STM32H7x7XI is shared with the RS232 of the STLINK-V3E controller. Connection is
switched by setting JP7 and JP8.
UM2525
USB OTG2_FS
UM2525
-
Rev 3
page 17/69
