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Hi, I'm a "rookie" and I've got an STM32F407VET6 board and an STLINK/V2, and I seem to understand both are to be powered via USB; my question is: Would connecting them to the same PC give rise to a conflict, electrical or otherwise ? Thank you !

Associate II
ST Employee

The board with an STM32F407VET6 is probably a custom board, isn't it?

If so, then you can easily connect both this board and the STLINK/V2 to a PC at the same time.



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No, the ground is common, the 5V is relative to the same reference.

The authentic ST-LINK/V2 doesn't use the pin 1/2 VTarget for anything other than the buffers/level-shifters

Also there is a supply pin which could power the other board is some circumstances. Pin 19 3.3V out

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Associate II

To P.B. : Yes, this board is custom (from China), and comes w/ an LCD 320x240 screen ILI9341 driven; when USB-plugged alone on a Win7 PC, it turns on, does some self tests, and then tries to communicate w/ his host (PC). Having no driver of any kind nor info on what it could need, I still wonder what this exchange should contain... I will surely learn about it somewhere, I guess. Anyway, thank you very much for comforting me about electrically connecting both devices together w/o risking damages, I'll soon begin to explore the Cube ecosystem that I've downloaded & installed. Thanks again for caring.

Associate II

To T.DL. : Ok ! I don(t know about the authenticity of the STLINK/V2 I have, but it 'looks' ok (for what it's worth); once both devices connected, I'll have a look at the voltages present @ JTAG pins 1,2 & 19 on the target board side, as they are accessible. I think I know STM32' GPIO pins are 5V tolerant, but I didn't know STLINK/V2' JTAG pin 19 could provide the 3.3V supply to the target board, thank you for instructing 🙂 Thank you very much for your info.