TLV320AIC29 Datasheet, PDF (32/85 Pages) Texas Instruments – STWREO AUDIO CODEC WITH INTERGRATED HEADPHONE AND SPEAKER AMPLIFIERS

TLV320AIC29
SLAS494A − DECEMBER 2005 − REVISED JANUARY 2006
MICBIAS_HND
MICIN_HND
2.5V
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Stereo
g
ss
OUT8P
LOUDSPEAKER
OUT8N
−1
MICBIAS_HED ^2.5V
MIC_DETECT_IN
To Detection block
MICIN_HED
Cellular g m
s
Stereo +
Cellular
gm
ss
m = mic
s = stere
g = ground/midbias
OUT32N
RECEIVER
−1
SPK1
SPK2
SPKFC
VGND
To Detection
block
1.5 V
Figure 23. Connection Diagram for Cap Interface
D Auto Detection
The AIC29 has built in monitors to automatically detect the insertion and removal of headsets. The detection
scheme can differentiate between stereo, cellular and stereo-cellular headsets. Upon detection of headset
insertion or removal, the AIC29 updates read-only bit D12 of control register 22H/Page 2. The AIC29 can be
programmed to send an active high interrupt for insertion and removal of headsets to the host-processor over
GPIO1 using bit D3 of control register 22H/Page 2 and GPIO2 using bit D4 of control register 22H/Page 2. The
headset detection feature can be enabled by setting bit D15 of control register 22H/Page 2. When headset
detection is enabled and headset is not detected, SPK1, VGND and MICBIAS_HED are turned off irrespective
of control register settings. The AIC29 also has the capability to detect button press on the headset microphone.
It consumes less than 50 µA while waiting for button press with everything else powered down. Upon button
press, the AIC29 updates read-only bit D11 of control register 22H/Page 2. It can also send an active high
interrupt for indicating button press to the processor over GPIO1 using bit D1D0 of control register 22H/Page
2. The AIC29 provides debounce programmability for headset and button detect. Debounce programmability
can be used to reject glitches generated, and hence avoids false detection, while inserting headset or pressing
button.
Figure 24 shows terminal connections and jack configuration required for various headsets. Care should be
taken to avoid any dc path from MIC_DETECT_IN to ground, when a headset is not inserted.
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