TLV320AIC28_08 Datasheet, PDF (32/85 Pages) Texas Instruments – STEREO AUDIO CODEC WITH INTEGRATED HEADPHONE AND SPEAKER AMPLIFIERS

TLV320AIC28
SLAS418B − FEBRUARY 2004 − REVISED MAY 2005
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Figure 24. Connection Diagram for Jacks
D Headset 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.
D Button Detection
− Interrupt polarity: Active high.
− Typical interrupt duration: Button pressed time + clock resolution. Clock resolution depends upon
debounce 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 press
removal.
AUDIO ROUTING
Audio Interface for Smart-Phone Applications
The AIC28 supports audio routing features to combine various analog inputs and route them to analog outputs
or the ADC for smart−phone applications. In smart-phone applications, the AIC28 can be used to interface the
cell-phone module to microphones and speakers. The AIC28 allows the input from the cell-phone module to
be routed to different speakers through a PGA which supports a range of 12 dB to –34.5 dB in steps of 0.5 dB.
The cell-phone input can also be mixed with the microphone input for recording through the ADC. The
microphone or DAC audio can be routed to the cell-phone output. The buzzer input from cell-phone can be
routed to the speakers through a PGA. The buzzer input supports PGA range of 0 dB to –45 dB in steps of 3
dB. The mixing and PGA are under full software control. The mixing feature can be used even when both ADC
and DAC are powered down. Cell-phone PGA, microphone PGA and buzzer PGA includes soft-stepping logic.
Soft-stepping logic works on Fsref if DAC is powered up otherwise; it works on internal oscillator clocks.
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