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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.
Table 5: Pin Assignment of J702
J404
Pin Name
1
MIC
2
GND
3
R-AUDIO
Smart_EVB_User_Guide
Figure 8: Earphone Circuit
2
3
5
Figure 9: Pin Assignment of J702
Function
Positive microphone input
Dedicated GND for audio
Earphone right channel
Confidential / Released
LTE Module Series
Smart EVB User Guide
1
6
4
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