9 Power supply
9.1 Power diagram
Warning: This Discovery kit is a low
‑
power system designed for VDD and VDD_MCU at 1.8 V only.
Attention: Do not remove JP3 when the board is powered up, or do not start the board with JP3 OFF, for this might have
an impact on the long
‑
term reliability of the MCU in specific temperature conditions. Use preferably JP4 OFF,
Reset button, or Power source removal to restart the board.
Attention: Do not remove the JP2 header when the board is powered up, for it might have an impact on the long
‑
term
reliability of the peripherals.
Attention: This Discovery kit uses a power scheme that might be different from standard application notes. Refer to
relevant application notes for your design.
Figure 15 describes the power architecture and the maximum voltage and current limits, under which functions
can be safely used on the STM32U5A9J-DK product. In any case, ensure the total power budget of the
application always conforms to the selected 5V Power source mode, if not, malfunction can occur. For detailed
configuration, refer to the relevant function description and technical application notes.
Note: When using Expansion Connectors, it might be necessary to use one of the three following Power sources,
depending on the application power budget:
• 5V_VIN, up to 2 A: expansion connectors power the STM32U5A9J-DK application
• 5V_USB_CHGR, up to 1.5 A: power the board from a 1.5 A compatible USB Host port or USB charger
• 5V_UCPD, up to 3.0 A: power the board from a 1.5 or 3.0 A compatible USB Host port or USB charger
and check the 5 V power supply voltage tolerance fits with the application.
UM2967
Power supply
UM2967 - Rev 1
page 18/68
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