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Rev 002
43
17. AUDIO Function
There are 2 AUDIO interfaces in the module as defined in the subsections below.
These functions can be electrically disabled when the special soldering is not soldered from J702 to
J709. For example, having it unsoldered allows for transmission of undisturbed signals via the
external connector (J1100) to an external interface board.
By default, AUDIO signals are available on its dedicated connector J701 (for AUDIO1), and J700 (for
AUDIO2) (J702 to J709 soldered).
The Main Audio is named
“AUDIO2”.
The Auxiliary Audio is named
“AUDIO1”.
Table 16:
AUDIO Configuration
Mode
Single ended
Differential
AUDIO2
NO
YES
AUDIO1
YES
NO
17.1. AUDIO1 Connector (J701)
Caution:
The analog audio channels are very sensitive to noise; this board is not designed for audio noise
optimization.
J701 is a RJ9 4-pin connector. AUDIO1
1
2
3
4
Figure 25. AUDIO Connector J701 by a 4-pin RJ9 Connector on Board
Table 17 defines the signals and relative pins for the AUDIO1 connector.
Table 17:
Pin-out of the AUDIO1 Connector
Pin Number
Signal Name
I/O
I/O Type
Description
1
MIC1N
I
Analog
Auxiliary microphone negative input
2
SPK1N
O
Analog
Auxiliary speaker negative output
3
SPK1P
O
Analog
Auxiliary speaker positive output
4
MIC1P
I
Analog
Auxiliary microphone positive input
17.2. AUDIO2 Connector (J700)
J700 is a RJ9 4-pin connector.
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