SIM800C datasheet(40/52 Pages) SIMCOM

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SIM800C_Hardware_Design_V1.02

2015-4-27

5.2.1

Antenna Interface



The length of trace between pin output and connector should be as short as possible;



Do not trace RF signal over across the board;



The RF signal should be far away from SIM card, power ICs.

5.2.2

Power Supply



Not only VBAT but also return GND are very important in layout;



The positive line of VBAT should be as short and wide as possible;



The correct flow from source to VBAT pin should go though Zener diode then huge capacitor;



Pin 36 and Pin37 are GND signals, and shortest layout to GND of power source should be designed;



There are 10 GND pads in the module; these pads could enhance the GND performances. On the

upper layer of these pads, do not trace any signal if possible.

5.2.3

SIM Card Interface



SIM card holder has no anti-EMI component inside. Thus SIM card interface maybe interfered,

please pay more attention on this interface during layout;



Ensure SIM card holder is far way from antenna or RF cable inside;



Put SIM card holder near the module, as nearer as possible;



Add ESD component to protect SIM_CLK, SIM_DATA, SIM_RST and SIM_VDD signals which

should be far away from power and high-speed-frequency signal.

5.2.4

Audio Interface



The signal trace of audio should far away from antenna and power;



The audio signal should avoid to parallel with VBAT trace.

5.2.5

Others



It is better to trace signal lines of UART bunched, as well as signals of USB.

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