St-Link/V2-1 Firmware Upgrade; Power Supply; Figure 5. Usb Composite Device - ST STM32H743I-EVAL User Manual

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ST-LINK/V2-1 firmware upgrade

The ST-LINK/V2-1 embeds a firmware upgrade mechanism for in-situ upgrade through the
USB port. As the firmware may evolve during the life time of the ST-LINK/V2-1 product (for
example new functionalities, bug fixes, support for new microcontroller families), it is
recommended to visit www.st.com
board and periodically, to stay up-to-date with the latest firmware version.

Power Supply

The STM32H743I-EVAL Evaluation board is designed to be powered by 5 V DC power
supply and is protected by PolyZen from wrong power plug-in events. It is possible to
configure the Evaluation board to use any of the following six sources for the power supply:
•
5 V DC power adapter connected to CN10, the power jack on the board (Power Supply
Unit on silk screen of JP10 (PSU)).
•
5 V DC power with 500 mA limitation from CN23, the USB Micro-B connector of ST-
LINK/V2-1 (USB 5 V power source on silkscreen of JP10 (STlk)). If the USB
enumeration succeeds (as explained below), the ST-LINK U5V power is enabled, by
asserting the PWR_EN pin. This pin is connected to a power switch (ST890) that
powers the board. This power switch features also a current limitation to protect the PC
in case of short-circuit on the board. If overcurrent (more than 600 mA) happens on the
board, the LED LD11 lights up.
•
5 V DC power with 500 mA limitation from CN14, the USB OTG2 HS Micro-AB
connector (USB 5V power source on silkscreen of JP10 (HS)).
•
5 V DC power with 500 mA limitation from CN18, the USB OTG1 FS Micro-AB
connector (USB 5V power source on silkscreen of JP10 (FS1)).
•
5 V DC power with 500 mA limitation from CN16, the USB OTG2 FS Micro-AB
connector (USB 5V power source on silkscreen of JP10 (FS2)).
•
5 V DC power from CN6 and CN7, the extension connectors for daughterboard
(daughterboard power source on silkscreen of JP10 (D5V)).
The STM32H743I-EVAL Evaluation board can be powered from the ST-LINK/V2-1 USB
connector CN23 (U5V), but only the ST-LINK/V2-1 circuit has the power before USB
enumeration, because the host PC only provides 100 mA to the board at that time. During
the USB enumeration phase the STM32H743I-EVAL board requires 300 mA power from the

Figure 5. USB composite device

before starting to use the STM32H743I-EVAL Evaluation
DocID030511 Rev 1
Hardware layout and configuration
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