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HUAWEI MG323 GSM M2M Module
Hardware Guide
3.7 SIM Card Interface
3.7.1 Overview
The MG323 module provides a SIM card interface complying with the ISO 7816-3
standard and supports automatic detection of a 3.0 V SIM card or a 1.8 V SIM card.
Table 3-6 lists the SIM card interface signals.
Table 3-6 SIM card interface signals
Pin No.
1
3
5
7
11
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 3-10 shows the circuit
of the SIM card interface.
Issue 04 (2011-08-22)
For detailed application of the MG323 UART1 interface, see
Port Design
Guide.
Signal Name
SIM_CLK
VSIM
SIM_DATA
SIM_RST
GND
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
HUAWEI Module UART Serial
I/O
Description
O
Clock signal of the SIM card
O
Power supply of the SIM card
I/O
Data signal of the SIM card
O
Reset signal of the SIM card
Ground signal of the SIM card
22
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