DocID028406 Rev 1 17/31
UM1956 Hardware layout and configuration
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+3V3 power supply
Using the +3V3 (CN4 pin 14) directly as power input, can be interesting, for instance, in
case the 3.3V is provided by a shield board. In this case the ST-LINK is not powered, thus
programming and debug features are not available. When the board is powered by +3V3
(CN4 pin 14), the solder bridge SB14 and SB9 (NRST) must be OFF.
6.2.3 External power supply output
When powered by USB or VIN, the +5V (CN4 pin 4) can be used as output power supply for
an Arduino Nano shield. In this case, the maximum current of the power source specified in
Table 4: External power sources must be respected.
The +3.3V (CN4 pin 14) can be used also as power supply output. The current is limited by
the maximum current capability of the regulator U3 (500 mA max).
6.3 LEDs
The tricolor LED (green, orange, red) LD1 (COM) provides information about ST-LINK
communication status. LD1 default color is red. LD1 turns to green to indicate that
communication is in progress between the PC and the ST-LINK/V2-1, with the following
setup:
• Slow blinking red/off: at power-on before USB initialization
• Fast blinking red/off: after the first correct communication between PC and ST-
LINK/V2-1 (enumeration)
• Red on: when initialization between PC and ST-LINK/V2-1 is completed
• Green on: after a successful target communication initialization
• Blinking red/green: during communication with target
• Green on: communication finished and successful
• Orange on: communication failure
User LD3: the green LED is a user LED connected to Arduino Nano signal D13
corresponding to STM32 I/O PB3 (Pin 26). Refer to Table 8, Ta b l e 9 and Table 10 for
concerned STM32:
• When the I/O is HIGH value, the LED is on
• When the I/O is LOW, the LED is off
PWR LD2: the red LED indicates that the STM32 part is powered and +5V power is
available.
6.4 Push button
B1 RESET: the push button is connected to NRST, and it is used to reset the STM32.
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