The FSA8039A is an audio jack switch for a normally open detect pin. The FSA8039A can work with 3-pole and 4-pole accessories. The FSA8039A features moisture sensing, which prevents false positive detection of accessories in the audio jack. The integrated MIC switch allows a processor to configure attached accessories. 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.Prevents False Detection of Accessories in the Audio Jack when Moisture is PresentRemoves Audio Jack Pop & Click Caused by MIC BiasDetects Audio Jack Accessories:Standard HeadphonesSend / End Button PressesIntegrates a MIC Switch for 4-Pole Configuration