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Concerning ST-Link on Nucleo Board

Question asked by Zhitai Liu on Jun 8, 2017
Latest reply on Jun 9, 2017 by Clive One

hi,  fellows!


I have some questions about ST-Link, especially those on Nucleo boards.

First, I often use the on board st-link link to debug/program some other custom boards, it works fine.

But someday, I'd noticed that the debugger's AIN_1(target VCC) is never  really connected to the MCU VCC

of the application board, for R9 is not lying there. See below:

From the UM1075 User manual of ST-Link, it says:

The power supply from the application board is connected to the ST-LINK/V2 debugging and programming board to ensure signal compatibility between both boards.

So is this really unnecessary? (For me, the debugger/programmer works fine so far.)

Or is this risky for some reason?

I really need to know about this!

For we are making a project with the whole nucleo board as a part, with st-link on it.

And I've already removed R23 for saving power.

See below:

Thanks for reading the post!