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Connection problem for new board design

ashkanr65
Associate II

I designed new board with STM32WB55CGU6 based on MB1993C (P-NUCLEO-USBDongle). You can see my schematic attached(I uploaded both P-nucleo schematic and my schematic). But I can't connect to my MCU through SWD pins (DIO,CLK,NRST). I use st-link, I can connect to P-nucleo usbdongle with these 3 pins, but I can't connect to my MCU. ST-Link can't find MCU. Unfortunately one of the crystals in my design (which is connected to pins number 23 and 24) has wrong footprint, but at least I should be able to connect to the MCU. does anyone know what is the problem?

1 ACCEPTED SOLUTION

Accepted Solutions

Make sure you provide a common ground.

The standalone ST-LINK/V2 (authentic) will also need VCC to pin 1.

If the IC is non-responsive​ need to focus on power and orientation. Check net list for disconnected or misnamed power nets.

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Up vote any posts that you find helpful, it shows what's working..

View solution in original post

1 REPLY 1

Make sure you provide a common ground.

The standalone ST-LINK/V2 (authentic) will also need VCC to pin 1.

If the IC is non-responsive​ need to focus on power and orientation. Check net list for disconnected or misnamed power nets.

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..