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HUAWEI MG323 GSM M2M Module
Hardware Guide
Description of the Application Interfaces
Issue 06 (2013-06-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
26
Pin No. Signal Name I/O Description
11 GND - Ground signal of the SIM card
3.7.2 Circuit Recommended for the SIM Card Interface
As the MG323 module is not equipped with a SIM card socket, you need to place a
SIM card socket on the user interface board. The SIM card signals are transmitted
outwards through the 50-pin B2B connector interface. Figure 3-11 shows the circuit of
the SIM card interface.
Figure 3-11 Circuit of the SIM card interface
VSIM
SIM_RST
SIM_CLK
SIM_DATA
GND
0.1µF
33 pF 33 pF 33 pF
ESD protection
SIM Card
Socket
HUAWEI Module
(Modem)