alc203-lf Realtek Semiconductor Corporation, alc203-lf Datasheet - Page 42

• Manufacturer Part Number: alc203-lf
• Description: Two-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

The figure below shows another simple way to implement the jack detect function without using the JD pin of the ALC203. It is
a good circuit for motherboard makers, as it is only a layout issue and no extra components are needed.
Once the HP_OUT jack is plugged in, output signals to LINE_OUT will be isolated, and no signals will be output to the
LINE_OUT jack. The only drawback to this plan is that software will not sense that the HP_OUT jack is plugged in. It may be
inconvenient for software to pay attention to this special application.
*To accommodate driver and hardware design, the following Jack-Detect pin assignment is
Two-Channel AC’97 2.3 Audio Codec
recommended.
For ALC203 D version:
Pin 17(JD1) = for UAJ1 (HP-OUT)
Pin 16(JD2) = for UAJ2 (AUX)
no pin for MIC-IN
Pin 43(GPIO0) = for HP-OUT or LINE-OUT
Pin 44(GPIO1) = for LINE-IN
For ALC203 E and later versions:
Pin 17(JD1) = for UAJ1 (HP-OUT)
Pin 16(JD2) = for UAJ2 (AUX)
Pin 45(JD0) = for MIC-IN
Pin 43(GPIO0) = for HP-OUT or LINE-OUT
Pin 44(GPIO1) = for LINE-IN
Implementing the Jack-Detect Function Without Using the JD Pin
HP-OUT-R
HP-OUT-L
A simple way to implement jack-detect function without
using ALC202's JD pin
+100uf
+100uf
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LINE-OUT
HP-OUT
ALC203 DataSheet
Rev1.6