Audio Interface - SimCom SIM7100x EVB User Manual

4.2 Audio Interface

J306 is the handset interface. X501 is the headset interface.
NOTE: The MIC's polarity must be correct.
Table 3: The Pin Description of the Handset and Headset Interfaces
No. Signal
1 MIC1_P
2 EAR_P
3 EAR_N
4 MIC1_N
5 GND
6 HEADSET_MIC+
7 HPH_L
8 HPH_R
NOTE:
1) Please refer Figure 1.The Pin 1 and Pin 2 of J501 are the SPK_M and SPK_P.
2) Audio cable must be away from the RF antenna, otherwise TDD noise may be occurred.
SIM7100x EVB User Guide
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Figure 6: Audio Interface
Input/Output
I
O
O
I
I
O
O
13
Smart Machine Smart Decision
Description
Positive microphone input
Positive receiver output
Negative receiver output
Negative microphone input
Ground
Headset microphone input
Positive microphone output
Negative microphone output
2015-07-20