Usb Otg_Fs; Table 10. Usart3 Connection; Table 11. Lpuart1 Connection - STMicroelectronics STM32H7 User Manual

UM2407
Pin
name
PD8
PD9
Pin
name
PB6
PB7
Hardware connection required for USART bootloader:
The STM32H7x3 embeds a USART bootloader. To use the USART bootloader (USART1),
hardware modifications are required on the Nucleo board. Flying wires must 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 the USB
Micro-AB connector (CN13) and the USB power switch (U18) connected to V
Warning:
A green LED (LD8) lights in one of these cases:
• Power switch (U12) is ON and the STM32H7 Nucleo-144 board works as a USB Host
•
V
BUS
as a USB Device.
The red LED (LD7) lights if overcurrent occurs when +5 V is enabled on V
mode.
Note: 1.ST recommends powering the Nucleo-144 board with an external power supply when
using the USB OTG or Host function.
2.SB76 must be ON when using USB OTG_FS.

Table 10. USART3 connection

Function
(default configuration)
SB19 ON
USART3 TX
SB9, SB18, and SB82 OFF
SB12 ON
USART3 RX
SB34, SB66, and SB81 OFF

Table 11. LPUART1 connection

Function Virtual COM port
SB9 and SB18 ON
LPUART1 TX
SB8, SB19, and SB61
OFF
SB34 and SB66 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
Virtual COM port
ARDUINO
SB8 and SB19 ON
SB9, SB18, and SB61
OFF
SB12 and SB68 ON
SB34 and SB66 OFF
UM2407 Rev 3
Hardware layout and configuration
ST morpho connection
SB82 ON
SB18 and SB19 OFF
SB81 ON
SB12 and SB66 OFF
®
D0 and
ST morpho connection
D1
SB8, SB9, and SB61
OFF
SB34 and SB68 OFF
BUS
.
BUS
in USB Host
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