8 Embedded STLINK-V3E
The new STLINK-V3E is embedded in the design of the Discovery main board. It allows access to the
programming, debugging, and monitoring functions of the STM32 microcontroller through the USB STLK
connector (CN5).
Ensure the following configuration is set on the main board (refer to Figure 11):
• The JP1, JP2 and JP3 headers must be ON to power STM32U5A9NJ and peripherals.
• The JP4 header must be ON (STLK Power source selected) and the relevant power input connected as
described in Section 9.2 Power source selection.
• The JP5 header must be ON to connect the output reset from STLINK-V3E to the TNRST reset input of
STM32U5A9NJH6Q.
• The JP6 header must be OFF to set STLINK-V3E in Active mode. The debug (CN11) and TAG (CN3)
connectors are not used by default.
Figure 11. Default Configuration to use STLINK-V3E
DT56163V1
The STM32U5A9J-DK product can be powered from the ST-LINK USB connector (CN5), but the host PC might
provide only 100 mA to the ST-LINK circuit until the end of the USB enumeration. The LD3985 LDO (U13)
supplies 3.3 V to STLINK-V3E with up to 5.5 V recommended input voltage. Then, the STLINK-V3E requires a
500 mA current to the host PC.
If the host PC can provide the required power, the enumeration finishes by a SetConfiguration command, and
then, the power switch STMPS2151STR is turned ON, after which the STM32U5A9J-DK product can draw a
500 mA current. At this step, the PC can rely on the 800 mA overcurrent protection of STMPS2151STR. In case
of overcurrent detection, the FAULT pin is asserted and the OVC red LED (LD5) turns ON.
If the host PC is not able to provide the requested current, the enumeration fails. Therefore, STMPS2151STR
remains OFF and the 5 V power reference of the board is OFF. The 5 V green LED (LD2) is turned OFF.
The green LED (LD2) is turned ON when the STM32U5A9J-DK product is correctly powered by 5V. The COM
LED (LD6) indicates the STLINK-V3E communication status with the host (refer to the technical note Overview of
ST-LINK derivatives (TN1235).
Note: In case the board is powered by a USB wall charger on CN5 with JP4 on STLK, there is no USB enumeration,
so the COM LED (LD6) remains OFF, but the power switch is activated and the board is powered up, with an
800 mA current protection.
UM2967
Embedded STLINK-V3E
UM2967 - Rev 1
page 15/68
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