UM1570
Hardware and layout
Doc ID 023594 Rev 2
4.3
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.
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5 V and 3 V can be used as output power supplies when another application board is
connected to pins P1 and P2. 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.
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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
standard EN-60950-1: 2006+A11/2009, and must be safety extra low voltage (SELV)
with limited power capability.
Note:
The board can be also powered through the USB USER connector and is protected by D4
and D5 diodes when both USBs are connected (in which case, the 5 V power is around 4.4
volts).
4.4 LEDs
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LD1 PWR: red LED indicates that the board is powered.
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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.
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User LD3: red LED is a user LED connected to the I/O PE9 of the STM32F303VCT6.
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User LD4: blue LED is a user LED connected to the I/O PE8 of the STM32F303VCT6.
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User LD5: orange LED is a user LED connected to the I/O PE10 of the
STM32F303VCT6.
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User LD6: green LED is a user LED connected to the I/O PE15 of the
STM32F303VCT6.
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User LD7: green LED is a user LED connected to the I/O PE11 of the
STM32F303VCT6.
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User LD8: orange LED is a user LED connected to the I/O PE14 of the
STM32F303VCT6.
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User LD9: blue LED is a user LED connected to the I/O PE12 of the STM32F303VCT6.
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User LD10: red LED is a user LED connected to the I/O PE13 of the STM32F303VCT6.
4.5 Pushbuttons
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B1 USER: user and wake-up button connected to the I/O PA0 of the STM32F303VCT6.
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B2 RESET: pushbutton connected to NRST is used to RESET the STM32F303VCT6.
