TSC2101-Audio Codec w/ Integrated Headphone Speaker Amp ...

SLAS392C− JUNE 2003 − REVISED SEPTEMBER 2004www.ti.comsssgggssmmStereo +Cellularg m ssCellulargmsStereogss32Figure 24. Connection Diagram for JacksHeadset Detection− Interrupt polarity: Active high.− Typical interrupt duration: 1.75 ms.− Debounce programmability on bits D10 and D9 in control register 22H/Page 2:− 00 => 16 ms duration (with 2 ms clock resolution)− 01 => 32 ms duration (with 4 ms clock resolution)− 10 => 64 ms duration (with 8 ms clock resolution)− 11 => 128 ms duration (with 16 ms clock resolution)− Headset detect flag is available till headset is connected.Button Detection− Interrupt polarity: Active high.− Typical interrupt duration: Button pressed time + clock resolution. Clock resolution depends upondebounce programmability.− Typical interrupt delay from button: Debounce duration + 0.5ms− Debounce programmability:− 00 => No glitch rejection− 01 => 8 ms duration (with 1 ms clock resolution)− 10 => 16 ms duration (with 2 ms clock resolution)− 11 => 32 ms duration (with 4 ms clock resolution)− Button detect flag is set when button is pressed. It gets clear when flag read is done after button pressremoval.AUDIO ROUTINGAudio Interface for Smart-Phone ApplicationsThe TSC2101 supports audio routing features to combine various analog inputs and route them to analogoutputs or the ADC for smart−phone applications. In smart-phone applications, the TSC2101 can be used tointerface the cell-phone module to microphones and speakers. The TSC2101 allows the input from thecell-phone module to be routed to different speakers through a PGA which supports a range of 12 dB to –34.5dB in steps of 0.5 dB. The cell-phone input can also be mixed with the microphone input for recording throughthe ADC. The microphone or DAC audio can be routed to the cell-phone output. The buzzer input fromcell-phone can be routed to the speakers through a PGA. The buzzer input supports PGA range of 0 dB to –45dB in steps of 3 dB. The mixing and PGA are under full software control. The mixing feature can be used evenwhen both ADC and DAC are powered down. Cell-phone PGA, microphone PGA and buzzer PGA includessoft-stepping logic. Soft-stepping logic works on Fsref if DAC is powered up otherwise; it works on internaloscillator clocks.