STMicroelectronics B-G474E-DPOW1, Руководство пользователя

Страница: 14 / 54

9 Embedded STLINK-V3E
The new STLINK-V3E is the embedded version of the STLINK-V3 included in the design of the Discovery board.
It allows access to the Program/Debug and Monitoring functions of the STM32 through the USB STLK CN3
connector.
In order to use the entire STLINK-V3E programming, debugging, and monitoring functions through the CN3 USB
STLK connector, ensure the following configuration is set on the STM32 target (Refer to
Figure 7 ):
• The SW1 octal mechanical switch must be set to ‘ALL ON’ configuration: all the 1.27 mm pitch switches
must be in a low physical position.
• The JP7 header must be equipped with a 2.54 mm jumper to connect the output reset from STLINK-V3E to
the TNRST reset input of the STM32G474RET6.
• The JP6 header must be OFF to set STLINK-V3E in Active mode.
• The JP4 header must be ON to power the STM32.
• The JP5 header must be ON (Power source selected and relevant power input connected as described in
Section 10.2 ).
• The CN1 debug and CN10 TAG connectors are not used.
Figure 7. Configuration to use STLINK-V3E
CN3
USB micro-B
ST-LINK receptacle
SW1
Octal mechanical
switch
JP7
TNRST
JP6
STLK NRST
CN1 debug
connector
JP5
5V_SELECTION
JP4
IDD
measurement
The B-G474E-DPOW1 product can be powered from the CN3 ST-LINK USB connector (STLK), but the host PC
only provides 100 mA to the ST-LINK circuit until the end of USB enumeration. Then, the B-G474E-DPOW1
product asks for the 500 mA power 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 B-G474E-DPOW1 product can draw a
current of 500 mA. At this step, the PC can rely on the STMPS2151STR overcurrent protection at 700 mA. In the
case of overcurrent detection, the FAULT pin is asserted which lights on the LD8 red LED (OC).
UM2577
Embedded STLINK-V3E
UM2577 - Rev 2
page 14/54