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參數資料
| 型號： | WM9712LEFL |
| 廠商： | Wolfson Microelectronics |
| 元件分類： | Codec |
| 英文描述： | AC97 Audio and Touchpanel CODEC |
| 中文描述： | AC97音頻編解碼器和觸摸屏 |
| 文件頁數： | 75/78頁 |
| 文件大?。?/td> | 689K |
| 代理商： | WM9712LEFL |
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Production Data
WM9712L
w
PD Rev 4.0 December 2003
75
JACK INSERT DETECTION
The circuit diagram below shows how to detect when a headphone or headset has been plugged into
the headphone socket. It generates an interrupt, instructing the controller to enable HPOUTL and
HPOUTR and disable OUT3.
L
R
switch closes
on insertion
+
-
+
-
HPOUTL
HPOUTR
GPIO
interrupt
logic
100k
DBVDD
Figure 30 Jack Insert Detection Circuit
The circuit requires a headphone socket with a switch that closes on insertion. It detects both
headphones and phone headsets. Any GPIO pin can be used, provided that it is configured as an
input.
HOOKSWITCH DETECTION
The circuit diagram below shows how to detect when the “hookswitch” of a phone headset is pressed
(pressing the hookswitch is equivalent to lifting the receiver in a stationary telephone).
GPIO
interrupt
logic
MIC
L
R
HOOK
SWITCH
47
+
-
+
-
HPOUTL
AGND
HPOUTR
MICL/MICR
680
2.2k
MICBIAS
PHONE HEADSET
WM9712L
Figure 31 Hookswitch Detection Circuit
The circuit uses a GPIO pin as a sense input. The impedance of the microphone and the resistor in
the MICBIAS path must be such that the potential at the GPIO pin is above 0.7
×
DBVDD when the
×
DBVDD when it is closed.
相關PDF資料 |
PDF描述 |
|---|---|
| WM9712LEFT | AC97 Audio and Touchpanel CODEC |
| WM9712LEFV | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFL | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFT | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFV | AC97 Audio and Touchpanel CODEC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| WM9712LEFL/RV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFL/V | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFT | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFT/RV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
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