u/Historical_Fun6039

Hi, I am trying to make a pcb board with the ch32v006k8u6. The board includes an i2c component (SC7A20HTR) as well, which I connect up to pin 14 & 15, pc1 and pc2.

When I mount everything, I cannot connect to the board with swio. Not even a basic query for the linked mcu type or chip info.

After some trial and error, I tried a board with nothing but the ch32 chip, and that worked fine.

Going back to the fully mounted board, disconnecting the I2C component allowed the swio connection.

What could be causing the conflict?