ST STM32G4 Nucleo-32 User Manual

6.6 Board functions
6.6.1 LEDs
LD1 STLINK-V3 COM LED
The bicolor LED LD1 (green, red) provides information about STLINK-V3E communication status. LD1 default
color is red. LD1 turns to green to indicate that communication is in progress between the PC and the STLINK-
V3E, with the following setup:
• Blinking red: the first USB enumeration with the PC is taking place
• Red LED ON: when the initialization between the PC and STLINK-V3E is complete
• Blinking red or green: during programming and debugging with target
• Orange ON: communication failure
LD2 USER
This green LED is connected to the following STM32G4 I/O:
• PB8, if the configuration is SB7 ON, and SB6 OFF (default configuration)
• PB3, if the configuration is SB7 OFF, and SB6 ON
It is also connected to the ARDUINO
®
D13 signal.
To light this LED, a high-logic state “1” must be written in the corresponding GPIO PB8 or PB3. A transistor drives
the LED, so its consumption does not affect the VDD STM32G4 power measurement.
LD4 5V_PWR
The green LED indicates that the STM32G4 part is powered, and the 5 V power is available on CN3 pin 4.
LD3 USB power fault (OC, overcurrent)
LD3 indicates that the board power consumption on USB ST-LINK exceeds 500 mA. Therefore, the user must
check the root cause of the overconsumption, and consequently (if needed) power the STM32G4 Nucleo-32
board with an external power supply.
6.6.2 Push button
B1 RESET (button)
This push button is connected to NRST (PG10-NRST) and is used to reset the STM32G4 microcontroller.
6.6.3 Current consumption measurement (IDD)
Jumper JP1, labeled IDD, is used to measure the STM32G4 microcontroller consumption by removing the jumper
and by connecting an ammeter.
• JP1 ON: STM32G4 is powered by 3V3 voltage (default)
• JP1 OFF: an ammeter must be connected to measure the STM32G4 current. If there is no ammeter, the
STM32G4 is not powered.
6.6.4 Virtual COM port (VCP): USART
The STM32G4 Nucleo-32 board offers the possibility to connect a USART interface to the STLINK-V3E.
Table 8. USART2 connection
Solder bridge configuration
(1)
Feature
(1)
SB1, SB12: ON USART2 (PA2/PA3) connected to STLINK-V3E Virtual COM port.
1. The default configuration is in bold
The communication between the target and the MCU is enabled on USART2 to support the Virtual COM port.
UM2397
Board functions
UM2397 - Rev 2
page 16/30

ST STM32G4 Nucleo-32 Specifications

General

Brand	ST
Model	STM32G4 Nucleo-32
Category	Motherboard
Language	English