SPRACU5C June 2021 – September 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
When the processor and the attached devices or an additional host are powered by different power sources, signal isolation is recommended since most of the processor IOs are not fail-safe. It is recommended to route the signals through a bus FET switch circuit designed to automatically isolate the two devices anytime the IO power is not valid for both devices. The bus FET switch and control logic are recommended to be powered from an always on power supply and only enabled by an AND function of power good signals from different power sources.