FSA8008A

FSA8008A Audio Jack Detection and Configuration Switch The FSA8008A is an audio jack detector and switch for 3− or 4−pole accessories. In addition to detection, the FSA8008A 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. Features Determines 3− or 4−Pole Audio Jacks Removes Audio Jack Pop−n−Click Caused by MIC Bias Detects Audio Jack Accessories: ♦ Standard Headphones ♦ Headsets with MIC ♦ Send / End Button Presses Integrates a MIC Switch for 4−Pole Configuration Applications 3.5 mm and 2.5 mm Audio Jacks Cellular Phones, Smartphones MP3 and PMP Related Resources FSA8008A Demonstration Board 2.5 to 4.4V 1.6 to VDD www.onsemi.com 1 UQFN10 CASE 523BC Detection Functionality Switch Type VDD VIO THD (MIC) ESD (Air Gap) Operating Temperature Package Top Mark Ordering Information Accessory Plug−In 3− or 4−Pole Audio Jack Send/End Key Pressed Decreased Timing for Sensitive Send/End Keys MIC 2.5 to 4.4 V 1.6 to VDD 0.01% Typical 15 kV −40°C to 85°C 10−Lead UMLP 1.4 x 1.8 x 0.5 mm, 0.4 mm Pitch KD FSA8008AUMX Baseband Processor GPIO 1 GPIO 2 GPIO 3 GPIO 4 Audio MIC Bias MIC CMIC L SPKR R SPKR RMIC VIO VDD DET EN J POLE S /E VDD LOW = plugged HIGH = unplugged 0 .5 mA J _DET Oscillator and Logic MIC S COMP HIGH =>J_MIC=0V LOW =>J_MIC>0.2V ...