Hi Lucas Rosa, Some questions for you: Can you help us understand how you determined the ADC is causing this issue? It sounds like the discharge is causing this issue, which is negatively affecting the ADC and surrounding circuitry. Also, the ADC can work down to AVDD = 1.8V, so an LDO at 2V would not necessarily be an issue for the ADC When you say the boards have the "same reference", does this mean that there is a voltage reference on one of the boards that is used for both (the ADC and maybe some other circuit)? Or is "reference" in this case referring to the ground i.e. the boards share the same ground reference? How do you recover from this issue? Do you have to power cycle the boards? Or does the digital LDO return to 3.3V once the cap has finished discharging? Is the cap discharging into the same ground as the ADC? Or do you have something like a PCB ground and an earth ground, where the ADC is connected to the PCB ground and the cap discharges to earth ground? Can you provide a schematic of both boards? -Bryan
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