Hardware layout and configuration UM2435
34/48 UM2435 Rev 2
7.10 LEDs
Three LEDs on the top side of the Nucleo board help the user during the application
development.
• LED6 COM: LED6 is a bi-color LED, whose default status is Red, turns to Green to
indicate that communication is in progress between the PC and the ST-LINK/V2-1, as
follows:
– 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 successfully
finished
– Green ON: after successful target communication initialization
– Blinking red / green: during communication with target
– Green ON: communication finished and OK
– Orange ON: communication failure
• LED4: 5V_USB: this red LED switches ON when over-current is detected (more than
500 mA is requested) on USB VBUS. In this case it is recommended to supply the
board by E5V or VIN, or in USB_CHARGER mode.
• LED5: 5V_PWR: this red LED indicates that MCU part is powered and 5 V power is
available.
Three user LEDs are also available, they are LED1, LED2 and LED3.
7.11 Push buttons
Four buttons are available on the Nucleo board.
• SW1, SW2, SW3 USER: button for User and Wake-Up function is connected to the I/O
PC13 of the STM32 MCU. When the button is pressed the logic state is “1”, otherwise
the logic state is “0”. Wake-Up is available on SW1, SB48 must be ON and SB47 OFF.
• SW4 RESET: button is connected to NRST, is used to RESET the STM32. When the
button is pressed the logic state is “0”, otherwise the logic state is “1”.
7.12 Current measurement
Jumper JP2 allows the user to measure the power consumption, by removing the jumper
and connecting an ammeter.
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