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SIM800_Hardware Design_V1.10 52 2018-08-13
5.2.4 Audio Interface
In order to avoid TDD noise, or current noise, or some other noise, the signal trace of audio should far away from
antenna and power, and it is recommended to surround audio traces by ground. And do not rout audio trace and
VBAT trace parallel.
5.2.5 Others
It’s better to trace signal lines of UART bunched, as well as signals of USB .
5.3 Recommended PCB Layout
Based on above principles, recommended layout is shown in the following illustration.
Figure 49: Recommended PCB layout
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