FSA8049

FSA8049 — Audio Jack Detection and Configuration, MIC/GND Cross point Switch August 2012 FSA8049 Audio Jack Detection and Configuration, MIC / GND Cross Point Switch Features Detection VDD THD (MIC) ESD (IEC 61000-4-2) (Air Gap) Operating Temperature Package Top Mark Ordering Information Audio Plug GND & MIC Polarity 2.5 to 4.4 V 0.002% Typical 15 kV -40°C to 85°C 9-Ball WLCSP 3x3 Array, 0.4 mm Terminal Pitch, 250 µm Ball M3 FSA8049UCX Applications  Cellular Phones, Smart Phones  MP3 and Portable Multimedia Player Description The FSA8049 is an audio jack detection switch for 3- or 4-pole accessories. The FSA8049 detects the locations of ground (GND) and microphone (MIC) poles on the audio plug and automatically routes them to the appropriate connections. This allows the end user to plug accessories, such as headsets with different audio pole configurations, into the mobile device and have them operate correctly.  Detects 3- or 4-pole audio accessories  Detects polarity of GND and MIC on 4-pole plugs  Automatically routes GND and MIC to audio jack terminals Related Resources  For evaluation boards and questions, please contact: [email protected]. Typical Application Baseband Processor GPIO Audio Sub System MIC Bias MIC RMIC CMIC VDD EN Oscillator & Logic CEXT Switch Enable Timing MIC 5Ω Detection To Audio Plug Detection Circuit Audio Jack LSPKR RSPKR GND/MIC1 3Pole 4Pole GND/MIC2 tOn/Off Capacitor GND 100mΩ GNDA Figure 1. Mobile P...