Board Power Supply - Vdd50_Usb And Vregoutv33V; Table 11. Usb Power Sources; Figure 15. Mcu Power: Usb Regulator; Figure 16. Vdd50_Usb And Vregoutv33V Schematic - ST STM32H7B3I-EVAL User Manual

If a deadlock occurs because of a mismatch between hardware and firmware PWR settings (SMPS/LDO), the
user can recover the board by applying the following procedure:
1. Power off the board.
2. Set SW1 (BOOT0) to 1 (system memory).
This changes the BOOT0 pin to 1 instead of 0, thus changing the device boot address to boot address 1
and making the bootloader start in System memory. This avoids starting firmware in the user Flash with a
wrong SMPS/LDO configuration versus the hardware board configuration.
3. Power on the board and connect using STM32CubeProgrammer (STM32CubeProg).
4. Erase the user Flash.
5. Power off the board and set SW1 to 0.
6. The board is recovered and can be used normally with matching firmware PWR.
6.3.4

Board power supply - VDD50_USB and VREGOUTV33V

The USB power sources to STM32H7B3LIH6QU microcontroller can be selected by setting solder bridges as
shown in Table
1. The default setting is in bold.
UM2662 - Rev 1
Figure 15.
11:
Figure 16. VDD50_USB and VREGOUTV33V schematic (Page 21)
Table 11.
(1)
Power mode
External USB supply
USB regulator supply
MCU Power: USB regulator
USB power sources
Mount
SB16, SB17
SB18
UM2662
Power supply
Unmount
SB18
SB16, SB17
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