The FSA8028 is an audio jack detector and switch for 3- or 4-pole accessories. In addition to detection, the FSA8028 features an integrated MIC 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 3- or 4-Pole Audio JacksRemoves Audio Jack Pop-n-Click Caused by MIC BiasDetects Audio Jack Accessories:Standard HeadphonesHeadsets with MICSend / End Button PressesIntegrates a MIC Switch for 4-Pole Configuration