HUAWEI EM820W HSPA+ PC Embedded Module

 

Hardware Guide

Description of the Application Interfaces

module board before entering the EM820W processor. There is also an EMI filtering and ESD protection circuit between the SIM card interface and the Mini PCI interface on the user’s board.

zPower supply

The SIM card interface is powered by an internal LDO regulator of EM820W. The default value of this regulator is 2.85 V. The power of the regulator is programmable in the range of 1.5 V to 3.05 V and is expected to be set to 3.0 V or 1.8 V.

zModem signals

After a power-on or reset, the USIM signals are activated to detect if a SIM card is present and to initialize it if it exists. Once a SIM card has been detected and initialized, the interface is always on. However, the clock signal is only activated when data is actually being transmitted. The USIM signals from the module are connected to the level translators, and then to the Mini Card host connector.

−The UIM_DETECT pin is optional, depending on whether this function is required.

−For UIM_DATA, it does not need to add a pull-up resistor, because it has been pulled up to UIM_PWR with a 15 kΩ resistor on the module, in compliance with the ISO/IEC 7816-3.

−For UIM_PWR, it is recommended to add an additional decoupling capacitor ranging from 1uF to 10uF, and to place a 10pF capacitor on each of the signals such as UIM_RST, UIM_CLK and UIM_DATA.

These levels exceed those required in ISO/IEC 7816-3.

zSIM signals

The following data is taken from the ETSI standard Specification of the 3 Volt Subscriber Identity Module - Mobile Equipment (SIM-ME) interface (GSM 11.12 version 4.3.1).

Table 3-6SIM RST requirements

RST

Minimum

Maximum

 

 

 

VIL

0

0.2Vcc

 

 

 

VIH

0.7Vcc

Vcc

 

 

 

Table 3-7SIM CLK requirements

 

 

 

 

CLK

Minimum

Maximum

 

 

 

VIL

0

0.2Vcc

 

 

 

VIH

0.7Vcc

Vcc

 

 

 

Issue 01 (2010-12-31)

Huawei Proprietary and Confidential

12

Copyright © Huawei Technologies Co., Ltd.

 

 

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Huawei EM820W manual Minimum Maximum, 2Vcc, 7Vcc SIM CLK requirements
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EM820W specifications

The Huawei EM820W is a cutting-edge mobile broadband device that exemplifies Huawei's commitment to innovation and excellence in the telecommunications sector. Designed for seamless connectivity, the EM820W caters primarily to users who demand high-speed data access while on the move.

One of the standout features of the Huawei EM820W is its support for high-speed 4G LTE connectivity. With download speeds that can reach up to 150 Mbps and upload speeds of up to 50 Mbps, users can enjoy smooth streaming, rapid downloads, and responsive online gaming experiences. This capability makes the device an ideal choice for both individual users and business professionals who rely on robust internet access.

The EM820W is equipped with a compact and lightweight design, making it highly portable. This device can be easily carried in a pocket or bag, allowing users to stay connected wherever they go. Its plug-and-play feature simplifies the setup process, ensuring that even those who are not tech-savvy can easily get online.

Another notable aspect of the Huawei EM820W is its compatibility with a wide range of operating systems, including Windows, macOS, and various distributions of Linux. This versatility means that users can connect the device to their preferred platforms without facing compatibility issues, enhancing the overall user experience.

The device also incorporates advanced security features to safeguard user data, including built-in encryption protocols. This is particularly important for business users who require secure connections for sensitive transactions and communications.

In addition to its connectivity capabilities, the EM820W showcases energy-efficient technologies that optimize battery performance. The device is designed to consume minimal power, allowing users to prolong usage times without frequently recharging.

The Huawei EM820W comes with a user-friendly interface, enabling users to easily manage their connections and monitor data usage. This feature is valuable for those who need to track their internet consumption to avoid exceeding data limits imposed by service providers.

With its blend of speed, portability, and user-oriented features, the Huawei EM820W stands out as a reliable solution for those seeking robust mobile broadband capabilities. Whether for personal use or professional needs, this device ensures that users remain connected in an increasingly digital world.
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