Config1
SMPS OFF
LDO ON
Config2
SMPS ON
LDO OFF
(Default config)
Config3
(SMPS and LDO
cascaded)
SMPS ON
LDO ON
Config4
(External SMPS)
SMPS ON
LDO ON
R71 ON ON ON ON
SB37 - ON ON ON
SB38 - ON - -
C15 2.2 uF 100 nF 2.2 uF 2.2 uF
C27 2.2 uF 100 nF 2.2 uF 2.2 uF
R13 - ON - -
R12 - - ON ON
SB34 - - - ON
C97 - - - ON
Warning:
Board SMPS/LDO firmware PWR configuration must match with the hardware configuration.
If not, you face a deadlock: after the reset, STLINK cannot connect the target anymore.
The firmware PWR configuration corresponds with the following in the main.c:
In the function SystemClock_Config:
• In the case of “Direct SMPS” hardware configuration (default):
HAL_PWREx_ConfigSupply(PWR_DIRECT_SMPS_SUPPLY);
• In the case of “LDO” hardware configuration:
HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);
If a deadlock is faced due to a mismatch between the hardware board setting and the firmware
setting (LDO/SMPS), the user can recover the board by doing the following:
• Power off the board.
• Change the SW1 switch position to "1".
• This changes the BOOT0 pin to 1 instead of 0 and thus the device boot address is changed
to boot address 1 making the bootloader starting in System memory, instead of starting the
firmware in the user Flash (Firmware that is setting a wrong LDO/SMPS configuration).
• Power on the board, and connect using STM32CubeProgrammer.
• Erase the user Flash.
• Power off the board and put back the switch SW1 to position "0".
• The board is now recovered and can proceed normally.
8.3
Measurement of MCU current consumption
The Jumper JP2 allows the current consumption of STM32H7B3LIH6QU to be measured directly by removing the
jumper and replace it with an external ammeter. If there is no ammeter, the STM32H7B3LIH6QU is not powered.
UM2569
Measurement of MCU current consumption
UM2569 - Rev 1
page 19/54
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