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HUAWEI EM820W HSPA+ PC Embedded Module
Hardware Guide Description of the Application Interfaces
Issue 01 (2010-12-31)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
10
The high-speed signal characteristics are in accordance with the Eye Pattern
Templates of the USB2.0 signal specification.
3.6 USIM Signals
The USIM is a smart card for UMTS/GSM cellular applications. The USIM provides
the required subscription information to allow mobile equipment to attach to a GSM or
UMTS network. The USIM also provides the subscriber's verification procedures as
well as authentication methods for network authentication during the process of
attaching to a network.
Table 3-5 USIM pins
Pin Name Description Direction to Module
8 UIM_PWR Power source for the external
UIM/SIM.
Output
10 UIM_DATA External UIM/SIM data signal. Input/output
12 UIM_CLK External UIM/SIM clock signal. Output
14 UIM_RESET External UIM/SIM reset signal. Output
It is recommended that the SIM card is inserted only after the power supply of the module is
disconnected; otherwise the SIM card may get destroyed.
3.6.1 USIM Interface Schematic Reference
There is no SIM card interface circuit in the EM820W module, and users need to add
the USIM interface circuit.
Figure 3-2 shows the definition of interface signals and the
typical USIM interface schematic.