UM2408 Rev 1
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UM2408
Hardware layout and configuration
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6.11
USB OTG FS or device
The STM32H7 Nucleo-144 board supports USB OTG or device-full-speed communication
via a USB Micro-AB connector (CN13) and USB power switch (U18) connected to V
BUS
.
Warning:
USB Micro–AB connector (CN13) cannot power the Nucleo-
144 board. To avoid damaging the STM32, it is mandatory to
power the Nucleo-144 before connecting a USB cable on
CN13. Otherwise there is a risk of current injection on
STM32H7 I/Os.
A green LED LD8 lights in one of these cases:
•
Power switch (U18) is ON and STM32H7 Nucleo-144 board works as a USB host.
•
V
BUS
is powered by another USB host when the STM32H7 Nucleo-144 board works as
a USB device.
The red LED LD7 lights if overcurrent occurs when 5 V is enabled on V
BUS
in USB host
mode.
Note:
1.It is recommended to power Nucleo-144 board by an external power supply when using
USB OTG or host function.
Table 12. USART3 pins
Pin
name
Function
Virtual COM port (default
configuration)
Arduino D0 & D1
ST morpho
connection
PD8
USART3 TX
SB103 OFF,
SB16 ON
and
SB15 OFF
SB103 OFF, SB16
OFF and
SB15 ON
SB103 ON
, SB16
OFF, SB15 OFF
PD9
USART3 RX
SB104 OFF,
SB17 ON
and
SB94 OFF
SB104 OFF, SB17
OFF and
SB94 ON
SB104 ON
, SB17
OFF and SB94 OFF
Table 13. USB pin configuration
Pin
name
Function
Configuration when using
USB connector
Configuration when using ST
morpho connector
Remark
PA8
USB SOF
-
-
Test point
TP4
PA9
USB VBUS
SB21 ON
SB21 OFF
-
PA10
USB ID
SB29 ON
SB29 OFF
-
PA11
USB DM
SB26 ON
SB26 OFF
-
PA12
USB DP
SB27 ON
SB27 OFF
-
PD10
USB FS PWR
EN
H745ZI-Q/H755ZI-Q: JP8 ON
H745ZI-Q / H755ZI-Q: JP8 OFF
-
PF10
USB FS PWR
EN
H745ZI-Q / H755ZI-Q: SB91
OFF
H745ZI-Q / H755ZI-Q: SB91 OFF
-
PG7
USB FS OVCR SB100 ON
SB100 OFF
-
