LTE Module Series
Smart EVB User Guide
Smart_EVB_User_Guide Confidential / Released 16 / 29
3.3.2. Earphone
An earphone can be used in audio interface J702. The following figures and table show the circuit of J702
audio interface for earphone and pin assignment of J702.
Figure 8: Earphone Circuit
Figure 9: Pin Assignment of J702
Table 5: Pin Assignment of J702
J404
Pin Name
Function
1
MIC
Positive microphone input
2
GND
Dedicated GND for audio
3
R-AUDIO
Earphone right channel
1
2
3
6
4
5
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