I just finished a small prototype run with qty = 20 boards, with each board having a MAX32666GXMBT+T on it. 2 of the boards failed my power supply check and upon deeper analysis, and desoldering this part, I was able to confirm that the LXA pin (ball B11) was dead shorted (0 ohms) on the BGA part. Seeing how this occurred on only 10% of my boards, with all the others working just fine, I am hoping to determine if there is something that I could have done with my testing that would result in creating this internal short on the BGA or if there is potential for these parts to just be bad out of the box. I am unable to find specific electric specifications around this pin that could help me further understand how this could be happening. Are you able to provide any additional information on this pin and if it has known sensitivities? I have a planned larger production run and would like to not experience this in larger quantities.
