Connect Tech COM Express Type 2 Carrier Board - User Manual
Revision 0.03
22
Audio Interface
The COM Expres Carrier features two 3.5mm stereo audio jacks that function as follows:
Audio Connectors
Function Audio Input
Audio Output
Input Output
Location
P16
P15
Function
Jumper Selectable
Line In or
Microphone In
Jumper Selectable
Line Out or
Headphone Out
Type
3.5mm Stereo Jack
Notes:
1.
The Microphone input is equipped with a Phantom Power circuit.
2.
The Headphone output is amplified by the CS4207 Codec.
Audio Selection Jumpers
Jumper Selection Choice
J7 J6 J9 J8
J10
J7
Line Out / Head Phone Out Right
J6
Line Out / Head Phone Out Left
J9
Line In / Microphone In Right
J8
Line In / Microphone In Left
J10-A *
Line Out Enable
J10-B *
Line In Enable
J10-C *
Microphone In Enable
J10-D *
Headphone Out Enable
* J10 Provides the CS4207 Audio Codec with the Sense input:
The Sense input is used by Audio Codecs to detect the presence of an audio plug being installed into an audio jack,
via a switch inside the jack. The Audio jacks on the COM Express carrier do NOT have this switch, so we have
provided these jumpers to mimic that function.
Not all operating systems require this sense input to be satisfied, for example audio under Ubuntu 10.04 LTS will
function fine without the Jumpers, however audio under Windows XP will not.
