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SIM800L-EVB_User Guide_V1.00 8 2013-07-22

3. Accessory Interface

3.1 Power Interface

Figure 4: Power Interface

Pin Signal I/O Description

1 Adapter input I 5V/2.5A DC source input

3.2 Audio Interface

Figure 5: Audio Interface

Headset interface:

Pin Signal I/O Description

1 MIC1P I Positive microphone input

2 SPK1P O Positive receiver output

3 MIC1N I Negative microphone input