F303RE datasheet(19/65 Pages) ETC2

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DocID025833 Rev 9

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UM1724

Hardware layout and configuration

Using VIN or E5V as external power supply

VIN or E5V can be used as external power supply in case the current consumption of

NUCLEO and extensions boards exceeds the allowed current on USB. In this condition it is

still possible to use the USB for communication, for programming or debugging only, but it is

mandatory to power supply the board first using VIN or E5V then connect the USB cable to

the PC. Proceeding this way ensures that the enumeration occurs thanks to the external

power source.

The following power sequence procedure must be respected:

Connect the jumper between pin 2 and pin 3 of JP5.

Check that JP1 is removed.

Connect the external power source to VIN or E5V.

Power on the external power supply 7 V< VIN < 12 V to VIN, or 5 V for E5V.

Check that LD3 is turned ON.

Connect the PC to USB connector CN1.

If this order is not respected, the board may be supplied by VBUS first then by VIN or E5V,

and the following risks may be encountered:

Table 6. External power sources

Input power

name

Connectors

pins

Voltage range

Max

current

Limitation

VIN

CN6 pin 8

CN7 pin 24

7 V to 12 V

800 mA

From 7 V to 12 V only and input current capability

is linked to input voltage:

800 mA input current when Vin=7 V

450 mA input current when 7 V<Vin (< or =) 9 V

250 mA input current when 9 V<Vin (< or =) 12 V

E5V

CN7 pin 6

4.75 V to 5.25 V

500 mA

Table 7. Power-related jumper

Jumper

Description

JP5

U5V (ST-LINK VBUS) is used as power source when JP5 is set as shown below (Default

setting)

VIN or E5V is used as power source when JP5 is set as shown below.

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