External Power Supply Inputs: Vin And E5V; Table 7. External Power Sources; Table 8. Power-Related Jumper - ST STM32 User Manual

UM1724
6.3.2

External power supply inputs: VIN and E5V

The external power sources VIN and E5V are summarized in
power supplied by VIN or E5V, the jumpers configuration must be the following:
•
Jumper on JP5 pin 2 and pin 3
•
Jumper removed on JP1
Input
power name
VIN
E5V
Jumper
JP5
Using VIN or E5V as external power supply
VIN or E5V can be used as an external power supply in case the current consumption of the
STM32 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:

Table 7. External power sources

Connectors Voltage
pins range
CN6 pin 8
7 V to 12 V
CN7 pin 24
4.75 V to
CN7 pin 6
5.25 V

Table 8. Power-related jumper

U5V (ST-LINK VBUS) is used as a power source when JP5 is set as shown below
(Default setting)
VIN or E5V is used as a power source when JP5 is set as shown below.
UM1724 Rev 14
Hardware layout and configuration
Table 7.
Max
current
From 7 V to 12 V only and input current
capability is linked to input voltage:
800 mA input current
800 mA
450 mA input current
when 7 V < Vin <= 9 V
250 mA input current
when 9 V < Vin <= 12 V
500 mA
Description
When the board is
Limitation
when Vin = 7 V
-
3 2 1
3 2 1
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