Smart Machine Smart Decision
SIM521x EVB User Guide
11.04.2011
10
4.2 Audio Interface
Figure 4:
Audio Interface
J204 is the headset interface. J201 is the handset interface.
NOTE: The MIC’s polarity must be correct.
Table 3: Headset interface
Pin
Signal
I/O
Description
1 GND
Ground
2 HEAD
I
Headset microphone input
3
HPH_L
O
Positive microphone output
4 HPH_R O
Negative
microphone
output
Table 4: Earphone interface
Pin
Signal
Input/Output
Description
5
MIC1P
I
Positive microphone input
6
EAR1Q_P
O
Positive receiver output
7
EAR1Q_N
O
Negative receiver output
8
MIC1N
I
Negative microphone input
Speaker interface
：
Please refer Figure 1. Pin 1 and Pin 2 is the SPK_P and SPK_N on J313.
NOTE: Audio cable must be away from the RF antenna, otherwise TDD noise may be occurred.
