SIM800C datasheet(32/52 Pages) SIMCOM

32 / 52 page

Smart Machine Smart Decision

SIM800C_Hardware_Design_V1.02

2015-4-27

M odule

PR ESEN C E

100nF

M O LE X -91228

SIM Card

22pF

VC C

GN D

RS T

VPP

CLK

I/O

GN D

VD D _EXT

SIM _VD D

SIM _R S T

SIM _C LK

SIM _D A T A

4.7K

ESD A6V 1

SIM _D E T

51Ω

Figure 30: Reference circuit of the 8-pin SIM card holder

The SIM_DET pin is used for detection of the SIM card hot plug in. Customer can select the 8-pin SIM card

holder to implement SIM card detection function. AT command “AT+CSDT” is used to enable or disable SIM

card detection function. For details of this AT command, please refer to document [1].

If the SIM card detection function is not used, customer can keep the SIM_DET pin open. The reference circuit

of 6-pin SIM card holder is illustrated in the following figure.

Module

SIM C ard

VC C

GN D

RS T

VPP

CLK

I/O

C 707 10M 006 512 2

22pF

100nF

SIM _VD D

SIM _R S T

SIM _C LK

SIM _D A T A

SIM _D E T

ESD A6V1

51Ω

Figure 31: Reference circuit of the 6-pin SIM card holder

4.8.2.

SIM Card Design Guide

SIM card signal could be interferenced by some high frequency signal, it is strongly recommended to follow

these guidelines while designing:



SIM card holder should be far away from GSM antenna



SIM traces should keep away from RF lines, VBAT and high-speed signal lines



The traces should be as short as possible



Keep SIM card holder’s GND connect to main ground directly



Shielding the SIM card signal by ground well



Recommended to place a 100nF capacitor on SIM_VDD line and keep close to the SIM card holder



Add some TVS which parasitic capacitance should not exceed 50pF



Add 51Ω resistor to (SIM_RST/SIM_CLK/SIM_DATA) signal could enhance ESD protection

4.8.3.

Design Considerations for SIM Card Holder

For 8 pins SIM card holder, SIMCom recommends to use Molex 91228.Customer can visit

http://www.molex.com for more information about the holder.

SIM800C 데이터시트(PDF) 32 Page - SIMCom

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