DB7 and DB8 pinmode problem

[monkazo]

hi, i was testing the library in the commercial 8 channel module, with an ESP32 and it worked fine but when i tested it on a PCB of my design (AD7606-4) it read 0 all the time. It took me a long time to find the solution, but in the end the problem was that the DB7 and DB8 pins where sets as outputs, i seted them as inputs and then the AD7606 began to read fine.

I am using the serial interface with the internal reference, again with an ESP32. do you have any idea about what happened there? because it's weird that the commercial module worked fine since the beginning but with my PCB i had to make that little change so i would appreciate any theories.

Regards

[leollo98]

It's possible that the decoupling caps have a incorrect placement, or not all the layout guidelines were not followed