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.
Thanks for reading the post!