AW3643

FSA4480 ↔ AW3643

FSA4480: USB Type-C audio switch with detection circuitry for headset (analog audio, UART, debug). Commutates SBU1/SBU2 for audio signals, includes microphone bias and detection. AW3643 -- Awinic analog. Key difference: headset detection architecture (impedance detection thresholds for various headset types). FSA4480 supports 500uA microphone bias current -- verify at AW3643. Audio performance: THD+N, crosstalk between USB and audio paths. Important: switch resistance (RON) for SBU paths -- typically <1Ohm at ON Semi. Wet/Dry detection logic may differ -- requires firmware adaptation.