Usb Otg Fs; Table 11. Lpuart1 Connection; Table 12. Usb Pin Configuration - STMicroelectronics STM32H7 Nucleo-144 User Manual

Hardware layout and configuration
Pin
name
PB6
PB7
Hardware connection required for USART bootloader:
The STM32H7x3 embeds USART bootloader. To use the USART bootloader (USART1),
hardware modifications are required on the NUCLEO board. Flying wires have to be
connected between PD8/PD9 (USART3 available on SB19/SB12) and PB10/PB11
(USART1 available on CN15).
6.6.6

USB OTG FS

The STM32H7 Nucleo-144 board supports USB OTG FS communication via a USB Micro-
AB connector (CN13) and USB power switch (U18) connected to V
Warning:
A green LED LD8 lights in one of these cases:
•
Power switch (U12) is ON and STM32H7 Nucleo-144 board works as a USB host
•
V
BUS
a USB device.
The red LED LD7 lights if overcurrent occurs when +5 V is enabled on V
mode.
Note: 1.It is recommended to power Nucleo-144 board by an external power supply when using
USB OTG or host function.
2.SB76 must be ON when using USB OTG FS.
Pin
name
PA8
PA9
PA10
PA11
28/48

Table 11. LPUART1 connection

Function Virtual COM port
SB9 ON
LPUART1 TX
SB8 and SB18 OFF
SB34 ON
LPUART1 RX
SB12 and SB68 OFF
USB Micro–AB connector (CN13) cannot power the Nucleo-
144 board. To avoid damaging the STM32H7, 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.
is powered by another USB host when the STM32H7 Nucleo-144 board works as

Table 12. USB pin configuration

Configuration
Function when using USB
USB SOF -
USB V SB23 ON
BUS
USB ID SB24 ON
USB DM SB21 ON
Arduino D0 and D1
SB8 ON
SB9 and SB18 OFF
SB68 ON
SB34 and SB66 OFF
Configuration
when using ST
connector morpho connector
-
SB23 OFF
SB24 OFF
SB21 OFF
UM2407 Rev 1
UM2407
ST morpho connection
SB9 OFF and SB18 OFF
SB12 OFF and SB34
OFF
.
BUS
in USB host
BUS
Remark
Test point TP4
-
-
-