Xnucleo User Manual
8
V2.6.1, Apr. 25
th
2015
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JP5
U5V (ST-LINK VBUS) is used as power source when JP5 is set as shown below (Default
setting)
CN2, VIN or E5V is used as power source when JP5 is set as shown below
2.1.2
USING CN2, VIN OR E5V AS EXTERNA L POWER SUPPLY
CN2, VIN or E5V can be used as external power supply in case the current consumption of
Xnucleo and its extension boards exceeds the allowed current on USB. In this condition, it is
mandatory to power supply the board using the external power source firstly, then connect the
USB cable and ST-LINK/V2 (mini) to the PC to ensure that the Xnucleo board can work properly.
Table 3: External power source parameters
Name
Pins
Voltage range
Max. current
Limitations
CN2
CN2
6V~12V
800mA
The inputted current is in connection
with the inputted voltage:
For CN2/VIN = 7V,
the inputted current is 800mA.
For 6V < CN2/VIN <= 9V,
the inputted current is 450mA.
For 9V<CN2/VIN(< or =)12V,
the inputted current is 250mA
VIN
CN6 pin 8
or
CN7 pin 24
E5V
CN7 pin 6
4.75V~5.25V
500mA
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Notices: The following power sequence procedure must be respected when using an external
power source:
1)
Set JP3 to U5V;
2)
Connect the external power source to CN2, VIN or E5V;
3)
Power on the external power supply CN2, VIN: 7V~12V, or E5V: 5V;
4)
Check that PWR LED is turned ON;
5)
Connect the PC to USB connector or ST-LINK/V2(mini) on Xnucleo.
