參數(shù)資料
型號(hào): AK4671EG
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/RCV/HP-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/垃圾車/惠普腺苷
文件頁數(shù): 60/164頁
文件大?。?/td> 1792K
代理商: AK4671EG
[AK4671]
MS0666-E-00
2007/10
- 60 -
MIC Detection
The AK4671 has the detecting function of microphone. The external circuit is showed in
Figure 56
.
The followings show the example of external microphone detection sequence:
(1)
PMMP bit should be set to “1” after CPU detects the jack insertion of microphone or headphone.
(2)
The MPWR pin drives external microphone.
(3)
The GPO2 pin (at GPOM2 bit = “1”) and DTMIC bit are set as
Table 21
. In case of Headset (with Mic), the input
voltage of MDT pin is higher than 0.075 x AVDD because of the relationship between the bias resistance at the
MPWR pin (typ. 2.2k
Ω
) and the microphone impedance. In case of Headphone (No Mic), the input voltage of MDT
pin is 0V because the pin of headphone jack connected to the MDT pin is assigned as ground.
Input Level of MDT pin
GPO2 pin
0.075 x AVDD
H
< 0.050 x AVDD
L
Table 21. Microphone Detection Result
DTMIC bit
1
0
Result
Mic (Headset)
No Mic (Headphone)
LIN1
LIN2
MPWR
DTMIC bit
MDT
0.075 x AVDD
PMMP bit
typ.
500k
G
M
R
L
Headset
G
R
L
Headphone
or
AK4671
Figure 56. Microphone Power Supply and Mic Detection
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