Design Considerations For Sim Card Holder - SimCom SIM900B Hardware Design

The SIM_PRESENCE pin is used for detection of the SIM card hot plug in. User 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, user can keep the SIM_PRESENCE pin open. The reference
circuit of 6-pin SIM card holder is illustrated in the following figure.
3.8.2

Design Considerations for SIM Card Holder

For 6-pin SIM card holder, SIMCom recommends to use Amphenol C707 10M006 5122. User can visit
http://www.amphenol.com
SIM900B_Hardware Design_V2.01
Figure 22: Reference circuit of the 8-pin SIM card holder
Figure 23: Reference circuit of the 6-pin SIM card holder
for more information about the holder.
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Smart Machine Smart Decision
2012-05-07