UM1570 Rev 7 19/41
UM1570 Hardware layout and configuration
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6.3 Power supply and power selection
The power supply is provided either by the host PC through the USB cable, or by an
external 5 V power supply.
The D1 and D2 diodes protect the 5 V and 3 V pins from external power supplies.
• 5 V and 3 V can be used as output power supplies when another application board is
connected to P1 and P2 pins. In this case, the 5 V and 3 V pins deliver a 5 V or 3 V
power supply and power consumption must be lower than 100 mA.
• 5 V and 3 V can also be used as input power supplies, for example when the USB
connectors are not connected to the PC. In this case, the STM32F3DISCOVERY board
must be powered by a power supply unit or by auxiliary equipment complying with the
standard EN 62368-1:2014+A11:2017 and must be Safety Extra Low Voltage (SELV)
with limited power capability.
Note: The board can be also powered through the USB USER connector. It is protected by D4 and
D5 diodes when both USBs are connected (in which case, the 5 V power is around 4.4
volts).
6.4 LEDs
• LD1 PWR: Red LED indicates that the board is powered.
• LD2 COM: LD2 default status is red. LD2 turns to green to indicate that
communications are in progress between the PC and the ST-LINK/V2.
• User LD3: Red LED is a user LED connected to the I/O PE9 of the STM32F303VCT6.
• User LD4: Blue LED is a user LED connected to the I/O PE8 of the STM32F303VCT6.
• User LD5: Orange LED is a user LED connected to the I/O PE10 of the
STM32F303VCT6.
• User LD6: Green LED is a user LED connected to the I/O PE15 of the
STM32F303VCT6.
• User LD7: Green LED is a user LED connected to the I/O PE11 of the
STM32F303VCT6.
• User LD8: Orange LED is a user LED connected to the I/O PE14 of the
STM32F303VCT6.
• User LD9: Blue LED is a user LED connected to the I/O PE12 of the STM32F303VCT6.
• User LD10: Red LED is a user LED connected to the I/O PE13 of the
STM32F303VCT6.
6.5 Push-buttons
• B1 USER: user and wake-up button connected to the I/O PA0 of the STM32F303VCT6.
• B2 RESET: push-button connected to NRST is used to RESET the STM32F303VCT6.
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