FSA8008A Audio Jack Detection and Configuration Switch The FSA8008A is an audio jack detector and switch for 3 or 4pole accessories. In addition to detection, the FSA8008A features an integrated MIC switch that allows the processor to configure the audio www.onsemi.com jack. The architecture is designed to allow common thirdparty headphones to be used for listening to music from mobile handsets, personal media players, and portable peripheral devices. Features 1 Determines 3 or 4Pole Audio Jacks UQFN10 Removes Audio Jack PopnClick Caused by MIC Bias CASE 523BC Detects Audio Jack Accessories: Standard Headphones Headsets with MIC Detection Accessory PlugIn 3 or 4Pole Audio Jack Send/End Send / End Button Presses Key Pressed Integrates a MIC Switch for 4Pole Configuration Functionality Decreased Timing for Sensitive Send/End Keys Applications Switch Type MIC 3.5 mm and 2.5 mm Audio Jacks V 2.5 to 4.4 V DD Cellular Phones, Smartphones V 1.6 to V IO DD MP3 and PMP THD (MIC) 0.01% Typical Related Resources ESD (Air Gap) 15 kV FSA8008A Demonstration Board Operating 40C to 85C Temperature Package 10Lead UMLP 1.4 x 1.8 x 0.5 mm, 0.4 mm Pitch Top Mark KD 2.5 to 4.4V 1.6 to V DD Ordering FSA8008AUMX Information Baseband VIO V DD Processor VDD 0.5 A Normally Open LOW = plugged (NO) Switch HIGH = unplugged DET GPIO 1 EN J DET GPIO 2 J POLE L R GND MIC GPIO 3 S/E GPIO 4 Oscillator 1 2 3 4 and Logic Audio R MIC MIC J MIC MIC Bias S MIC COMP CMIC L SPKR HIGH=>J MIC=0V LOW=>J MIC>0.2V GND R SPKR Figure 1. Mobile Phone Example Semiconductor Components Industries, LLC, 2011 1 Publication Order Number: December, 2017 Rev. 2 FSA8008A/D 1632 1632 FSA8008A Pin Configuration DET VIO 2 1 EN J DET 3 10 JPOLE GND 4 9 VDD J MIC 5 8 6 7 S/E MIC Figure 2. 10Lead UMLP Pin Assignment (Through View) Table 1. PIN DESCRIPTIONS Name Pin Type Description Function DET 2 Output Indicates if an accessory is plugged into the audio jack, as detected 0 Plugged on the J DET pin 1 Unplugged JPOLE 4 Output Indicates if an accessory plugged into the audio jack is 3 pole or 4 0 4pole jack pole 1 3pole jack S/E 6 Output Indicates state of SEND/END for a 4pole accessory when a key 0 No key press has been pressed 1 Key press EN 3 Input Controls internal microphone switch between the J MIC and MIC 0 MIC / J MIC switch open pins 1 MIC / J MIC switch closed J DET 10 Input Input from a pin of the audio jack socket tied to a mechanical switch 0 Plugged that typically closes whenever an audio jack is inserted into that 1 Unplugged socket MIC 7 Switch Microphone switch path that goes to the microphone preamplifier See EN pin J MIC 8 Switch Microphone switch path that connects to the microphone and SEND/ END key audio jack pole VDD 5 Power Core supply voltage VIO 1 Power Baseband I/O supply voltage GND 9 Ground Ground for both the audio jack and the PCB 1. 0 = V or V 1 = V or V OL IL OH IH www.onsemi.com 2