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PCB STM32 JTAG connector question.

werto165
By werto165
in Hobby Electronics
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Posted

Hi All, 

 

I have a wifi board that I need to update firmware with using JTAG 10 PIN:

 

ULINKpro User's Guide: Cortex Debug (10-pin)

 

Does it matter if Vcc/ GND/GND come from a different source other than the ST LINK programmer (it'll be coming from Vcc_usb from a LDO regulator turning it to 3.3V) because I want to expose as few pins as possible on the PCB. Additionally is GND detect needed?

image.png.874105edbb7e3c38b51de5387b4451dc.png

Thanks.

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Posted

I believe that you should give the WiFi board and programmer common ground, if that answers your question.

 

edit: as long as everything has common ground you should be good.

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It’s probably fine, but it’ll depend on your specific programmer. My jlink edu mini actually doesn’t provide power on its vcc line, I’m pretty sure it’s just a voltage detect for configuration. 

ASU

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