6.4.6 VDD_MCU I
DD
measurement
The labeled I
DD
jumper (JP5) is used to measure the consumption of the STM32 microcontroller by removing the
jumper and by connecting an ammeter or any other current measurement tool.
• Jumper ON: STM32 Microcontroller is powered (default).
• Jumper OFF: an ammeter or an external 3V3 power source must be connected to power and measure the
STM32 microcontroller consumption.
The I
DD
jumper performs the current measurement for both 3V3 and 1V8 MCU voltage ranges.
6.5
LEDs
User green LED (LD1)
The user green LED (LD1) is connected to the PC7 STM32 I/O (SB21 ON and SB23 OFF, default configuration)
or PA5 (SB21 OFF and SB23 ON, optional configuration corresponding to the D13 ST Zio connector). A transistor
is used to drive the LED whatever the MCU 1.8/3.3 V voltage range.
User blue LED (LD2)
The user blue LED (LD2) is connected to PB7. A transistor is used to drive the LED whatever the MCU 1.8/3.3 V
voltage range.
User red LED (LD3)
The user red LED (LD3) is connected to PG2. A transistor is used to drive the LED whatever the MCU 1.8/3.3 V
voltage range.
These user LEDs are ON when the I/O is in the HIGH state, and are OFF when the I/O is in the LOW state.
COM tricolor LED (LD4)
The tricolor (green, orange, and red) LED (LD4) provides information about STLINK-V3E communication status.
For details information about this LED refer to the technical note Overview of ST-LINK derivatives (TN1235)
Green PWR LED (LD5)
The green LED (LD5) indicates that the Nucleo-144 is powered by a 5 V source, and this source is available on
CN8 pin 9 and CN11 pin 18, but also for the LDO and external SMPS input.
Red STLINK-V3E USB OC power switch fault LED (LD6)
The red LED (LD6) indicates that the board power consumption on the USB exceeds 500 mA.
• If 500 mA or more is expected, the board must be supplied by one of the external 5 V sources compatible
with more than 500 mA capability.
• If more than 500 mA is not expected, the board must be analyzed to understand the extra consumption.
USB Type-C
®
green LED (LD7)
The green LED (LD7) is driven by the presence of the 5 V on the USB Type-C
®
user connector. refer to
USB Type-C
®
FS/HS for more details.
UM2861
LEDs
UM2861 - Rev 5
page 24/49
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