The FSA8009 is an audio jack microphone / video switch for 3- or 4-pole accessories with send / end (S/E) detection. In addition to detection, the FSA8009 features an integrated microphone / video switch that allows the processor to configure the audio jack. The architecture is designed to allow common third-party headphones to be used for listening to music from mobile handsets, personal media players, and portable peripheral devices. ￭ Determines When Send / End Button Key is Pressed ￭ Integrates a MIC / Video Switch for 4-Pole Configuration ￭ Reduces Pop / Click Caused by Microphone Bias