Push-Buttons; Mcu Voltage Selection: 1V8/3V3; Current Consumption Measurement (Idd); Virtual Com Port (Vcp): Lpuart/Usart - STMicroelectronics STM32H7 User Manual

Hardware layout and configuration
6.6.2

Push-buttons

B1 USER (blue button): the user button is connected to the I/O PC13 by default (tamper
support: SB51 ON and SB58 OFF) or PA0 (wake-up support: SB58 ON and SB51 OFF) of
the STM32H7 series microcontroller.
B2 RESET (black button): this push-button is connected to NRST and is used to reset the
STM32H7 series microcontroller.
6.6.3

MCU voltage selection: 1V8/3V3

The STM32H7 Nucleo-144 board offers the possibility to supply the STM32H7 series
microcontroller with 1.8 V or 3.3 V. JP5 is used to select the VDD_MCU power level.
•
Place the JP5 jumper on 3V3 to supply the MCU with 3V3, connecting pins 1 and 2.
• Place the JP5 jumper on 1V8 to supply the MCU with 1V8, connecting pins 2 and 3.
6.6.4

Current consumption measurement (IDD)

The IDD jumper (JP4) is used to measure the STM32H7 series microcontroller consumption
by removing the jumper and by connecting an ammeter:
•
JP4 must be ON when STM32H7 is powered with 3V3_VDD (default)
•
If JP4 is OFF, an ammeter must be connected to measure the STM32H7 current. If
there is no ammeter, the STM32H7 is not powered.
Warning:
If needed, for low power measurement (for example Standby mode), to measure only MCU
(U7) power consumption, the user must remove the following components: R4, R43, R44,
R45, R46, R47, R48, R49, R50, R51, R52, R53, R59, R61, U1, U10, U15, and SB45.
After removing these components, it becomes impossible to use Ethernet and 1.8 V debug
with STLINK-V3E.
6.6.5

Virtual COM port (VCP): LPUART/USART

The STM32H7 Nucleo-144 board enables connecting an LPUART or a USART interface to
the STLINK-V3E, or to the ST morpho and ARDUINO
The selection is done by setting the related solder bridges (refer to
below).
By default the USART3 communication between the target STM32H7 and the STLINK-V3E
is enabled, to support the Virtual COM port (SB12 and SB19 ON).
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On MB1364 REV.C, 'VDD_MCU' is also supplying Ethernet
PHY (U15) and debug voltage translation (U1 and U10).
UM2407 Rev 3
®
Uno V3 connectors.
Table 10
UM2407
and Table 11