I’m using the PR54-3 with a Particle Argon with a PR33-14 (8 Ch ADC) and PR33-35 (12 Ch ADC) connected. I also use the PR54-3 board’s 3.3v I2C screwdowns for communication with a pair of GPIO devices.
I have build 4 devices with the exact same configuration, but on one device, I have issues with my GPIOs that share the bus with the ADCs. I can poweroff, then disconnect the ADCs, repower and the GPIOs work fine. Poweroff and reconnect either or both ADCs and power back on, the GPIOs act screwy.
I have replaced the PR54-3, the argon inserted on that board, the GPIOs and the ADCs but the problem persists. I’ve also disconnected every line into the ADCs to see if the problem was coming from that, but no change.
Have you experienced these ADCs polluting the 3.3v I2C lines from the Particle Argon? Again I’ve used this configuration before with no issues, and actually have an identical installation onsite that is working fine. But the only constant I can find is: ADCs are connected and the GPIOs get screwy. Any thoughts on this?