Hardware layout and configuration UM2407
26/50 UM2407 Rev 2
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 (Wakeup 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)
Jumper JP4, labeled IDD, 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: on MB1364 REV.C, ‘VDD_MCU’ is also supplying Ethernet
PHY (U15) and debug voltage translation (U1 and U10).
If needed, for low power measurement (for example standby mode), in order 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 offers the possibility to connect an LPUART or a USART
interface to the STLINK-V3E or to the ST morpho connectors and ARDUINO
®
Uno V3
connectors.
The selection is done by settings the related solder bridges. (Refer to Table 10 and Table 11
below).
By default the USART3 communication between the target STM32H7 and the STLINK-V3E
is enabled, to support the Virtual COM port for the Mbed (SB5 and SB6 ON).
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