Huawei EM820W Usim Signals, Usim Interface Schematic Reference, Pin Name Description, Uim/Sim

HUAWEI EM820W HSPA+ PC Embedded Module
Hardware Guide	Description of the Application Interfaces

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
8	UIM_PWR	Power source for the external
		UIM/SIM.
10	UIM_DATA	External UIM/SIM data signal.
12	UIM_CLK	External UIM/SIM clock signal.
14	UIM_RESET	External UIM/SIM reset signal.

Direction to Module

Output

Input/output

Output

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.

Issue 01 (2010-12-31)	Huawei Proprietary and Confidential	10
	Copyright © Huawei Technologies Co., Ltd.