STMicroelectronics Nucleo Development Board for STM32 Microcontrollers NUCLEO-F103RB NUCLEO-F103RB Data Sheet

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DocID025833 Rev 5

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. In 
 case VIN, E5V or +3V3 is used to power the Nucleo board, using an external power supply 
unit or an auxiliary equipment, this power source must comply with the standard EN-60950-
1: 2006+A11/2009, and must be Safety Extra Low Voltage (SELV) with limited power 
capability.

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 

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