AC'97 Audio Front panel pin diagram
Now days if you buy new
components and build a computer you really do not have to know anything about
connecting the motherboard to the case. Everything is now labelled clearly and
the wires are usually joined together in order.
Its when you begin to
rebuild older computers that we start to run into problems.
The analog front panel header design lets OEMs and integrators place audio
functionality on the front panel of a PC system via a cabled up front panel
dongle. This document describes the header pinout configuration for connecting
chassis with Intel® High Definition Audio or AC'97 audio cable up.
The reason I have put this information on the internet is for self reference.
I especially need this information when I am trying to install a motherboard
into an odd computer case that is not suited to it.
Note: Intel® High Definition Audio headers are
pin-compatible with AC'97 chassis and connectors.

| |
For Intel® High Definition Front Panel Audio
|
| Pin
|
Signal Name
|
Description
|
|
1 |
PORT 1L |
Analog Port 1 - left
channel (Microphone) |
|
2 |
GND |
Ground |
|
3 |
PORT 1R |
Analog Port 1 -
right channel (Microphone) |
|
4 |
PRESENCE# |
Active low signal
that signals BIOS that an Intel® HD Audio dongle is connected to the
analog header. PRESENCE# = 0 when an Intel® HD Audio dongle is connected |
|
5 |
PORT 2R |
Analog Port 2 -
right channel (Headphone) |
|
6 |
SENSE1_RETURN |
Jack detection
return for front panel (JACK1) |
|
7 |
SENSE_SEND |
Jack detection sense
line from the Intel® HD Audio CODEC jack detection resistor network |
|
8 |
KEY |
Connector key |
|
9 |
PORT 2L |
Analog Port 2 - left
channel (Headphone) |
|
10 |
SENSE2_RETURN |
Jack detection
return for front panel (JACK2) |
|
| |
For AC-97 Front Panel Audio |
| Pin
|
Signal Name
|
Description
|
|
1 |
MIC |
Front panel
microphone input signal (biased when supporting stereo microphone) |
|
2 |
AUD_GND |
Ground used by
analog |
|
3 |
MIC_BIAS |
Microphone power /
additional MIC input for stereo microphone support |
|
4 |
AUD_GND |
Ground used by
analog audio circuits |
|
5 |
FP_OUT_R |
Right channel audio
signal to front panel (headphone drive capable) |
|
6 |
FP_RETURN_R |
Right channel audio
signal return from front panel (when headphones unplugged) |
|
7 |
AUD_5V |
Filtered +5 V used
by analog audio circuits |
|
8 |
KEY |
No pin |
|
9 |
FP_OUT_L |
Left channel audio
signal to front panel (headphone drive capable) |
|
10 |
FP_RETURN_L |
Left channel audio
signal return from front panel (when headphones unplugged) |
|
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