ST-LINK/V2 Pin Header

[Lucas Medeiros]

Posted on May 08, 2018 at 17:04

Hello

.

I want to use the

ST-LINK

/V2 to program a custom

STM32F0

micro

troght

SWD

.

Taking a look at

ST-LINK

/V2 User Manual

(

UM1075

)

,

I had a doubt about

VAPP

pins

.

These

pins

(

1

and

2

), are input or output

pins

?

I guess these

pins

are inputs and should be connected to my

power

supply

board, enabling the

STLink

to do identify the

power

supply

level. Am I right?

[S.Ma]

Posted on May 08, 2018 at 18:43

The note (1) seems to tell that the ST Link has a level shifter for the digital signals (3.3V, 2.5V, 1.8V), this level shifter needs to be powered by the application. Its consumption should be small.

I guess the STLink also uses VAPP as analog monitoring to detect when the application is unpowered and return error message when trying to debug.

The rest of ST Link electronics is powered by USB.

Typically, debug required minimum 4 wires.

[Lucas Medeiros]

Posted on May 10, 2018 at 15:23

Thank you.