Continue with the audio CODEC schematic, selected a potential STIA 3.5mm...
Continue with the audio CODEC schematic, selected a potential STIA 3.5mm headphone jack, use logic level shifters on the WWAN/BT M.2's UART and PCM interfaces since the M.2 spec states that these are 1.8V logic levels Still need to assign the corresponding SAI interface for the BT.