參數(shù)資料
型號(hào)： TLV320AIC28IRGZ
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQCC48
封裝： 7 X 7 MM, GREEN, PLASTIC, QFN-48
文件頁(yè)數(shù)： 25/85頁(yè)
文件大小： 1053K
代理商： TLV320AIC28IRGZ
TLV320AIC28
SLAS418B FEBRUARY 2004 REVISED MAY 2005
www.ti.com
31
1
MICBIAS_HED
MICBIAS_HND
2.5V
MICIN_HED
MICIN_HND
OUT8P
OUT8N
OUT32N
SPK1
SPK2
To Detection
block
SPKFC
VGND
1.5 V
MIC_DETECT_IN
To Detection block
LOUDSPEAKER
RECEIVER
s
gm
s
gm
s
g
Stereo
Cellular
Stereo +
Cellular
m = mic
s = stere
g = ground/midbias
2.5V
Figure 23. Connection Diagram for Cap Interface
D Auto Detection
The AIC28 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 AIC28 updates read-only bit D12 of control register 22H/Page 2. The AIC28 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 AIC28 also has the capability to detect button press on the headset microphone.
It consumes less than 50
A while waiting for button press with everything else powered down. Upon button
press, the AIC28 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 AIC28 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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