User manual
Hardware layout and configuration UM1724
16/49 DocID025833 Rev 3
Figure 8. Using ST-LINK/V2-1 to program the STM32 on an external application
5.3 Power supply and power selection
The power supply is provided either by the host PC through the USB cable, or by an
external Source: VIN (7V-12V), E5V (5V) or +3V3 power supply pins on CN6 or CN7.
5.3.1 Power supply input from the USB connector
The ST-LINK/V2-1 supports USB power management allowing to request more than
100 mA current to the host PC.
All parts of the STM32 Nucleo board and shield can be powered from the ST-LINK USB
connector CN1 (U5V or VBUS). Note that only the ST-LINK part is power supplied before
the USB enumeration as the host PC only provides 100 mA to the board at that time. During
the USB enumeration, the STM32 Nucleo board requires 300 mA of current to the Host PC.
If the host is able to provide the required power, the targeted STM32 microcontroller is
powered and the red LED LD3 is turned ON, thus the STM32 Nucleo board and its shield
can consume a maximum of 300 mA current, not more. If the host is not able to provide the
required current, the targeted STM32 microcontroller and the MCU part including the
extension board are not power supplied. As a consequence the red LED LD3 remains
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