Mcu Voltage Selection 1V8/3V3; Current Consumption Measurement (Idd); Virtual Com Port (Vcp): Lpuart1/Usart3; Table 12. Usart3 Connection - ST STM32H5 Nucleo-144 User Manual

10.3

MCU voltage selection 1V8/3V3

The STM32H5 Nucleo-144 board offers the possibility to supply the STM32H5 microcontroller with 1.8 or 3.3 V.
JP4 is used to select the VDD_MCU power level:
• JP4 jumper must be fitted on [1-2] to supply the MCU with 3V3
• JP4 jumper must be fitted on [2-3] to supply the MCU with 1V8
10.4

Current consumption measurement (IDD)

The JP5 jumper, labeled IDD, is used to measure the STM32H5 microcontroller consumption by removing the
jumper and by connecting an ammeter:
• JP5 must be ON when STM32H5 is powered with VDD (default)
• If JP5 is OFF, an ammeter must be connected to measure the STM32H5 current. If there is no ammeter,
the STM32H5 is not powered.
10.5

Virtual COM port (VCP): LPUART1/USART3

The STM32H5 Nucleo-144 board offers the flexibility to connect the LPUART1 or the USART3 interface to the
STLINK-V3EC, or to the ST morpho and ARDUINO
The selection is done by setting the related solder bridges. (refer to
By default, the serial interface USART3 (PD8/PD9) that supports bootloader is connected and directly available as
a Virtual COM port of a PC connected to the STLINK-V3EC USB Type-C
Pin name
PD8
PD9
Pin
name
PB6 LPUART1 TX
PB7 LPUART1 RX
By default:
• Serial communication between the target MCU and ST-LINK MCU is enabled on USART3 because this
interface supports the bootloader mode.
• Serial communication between target MCU, ARDUINO
LPUART1, not to interfere with the VCP interface.
UM3115 - Rev 1
Table 12.
Definition Virtual COM port (default configuration)
SB24 ON
USART3 TX
SB13, SB15, and SB23 OFF
SB18 ON
USART3 RX
SB40, SB65, and SB75 OFF
Table 13.
Virtual COM port (default
Definition
configuration)
SB15 and SB23 ON
SB14,SB24 OFF
SB40 and SB65ON
SB18 and SB63 OFF
®
Uno V3 connectors.
Table 12 and
®
connector (CN1).
USART3 connection
ST morpho connection
SB13 ON
SB23 and SB24 OFF
SB75 ON
SB18 and SB65 OFF
LPUART1 connection
®
ARDUINO D0 and D1
SB14 and SB24 ON
SB15 and SB23 OFF
SB18 and SB63 ON
SB40 and SB65 OFF
®
Uno V3, and ST morpho connectors is enabled on
UM3115
MCU voltage selection 1V8/3V3
Table 13 below).
ST morpho connection
SB14 and SB15 OFF
SB40 and SB63 OFF
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