4114877
Rev 5.0
October 12, 2015
26
Development Kit User Guide
Interfaces
3.5.
Audio
Note:
HL75xx and HL85xxx modules do not support analog audio.
A headset jack (CN1105) is available on the development kit which allows the HL series module to
connect to an audio interface. Switch SW1100 allows audio selection from direct analog audio
connection or PCM codec conversion output, and switch SW1101 is used for activating an audio
amplifier. Jumpers CN1103 and CN1104 are used to bypass or to enable an audio amplifier.
Figure 15. Audio Interface
Figure 16. 4-pin RJ9 Connector for Audio Signals
Refer to the following table for Audio connector signal pin description.
Table 5.
Audio Connector Pin Description
Pin Number
Signal Name
I/O
I/O Type
Description
1
MIC_N
I
Analog
Microphone negative input
2
SPK_N
O
Analog
Main speaker negative output
3
SPK_P
O
Analog
Main speaker positive output
4
MIC_P
I
Analog
Main microphone positive input
Both microphone and speaker signals are configured in differential mode.
SW1100
SW1101
CN1103 and CN1104
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