Huawei EM820W manual WDISABLE# Signal, LEDWWAN# Signal, Pins Name Description Direction to Module

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HUAWEI EM820W HSPA+ PC Embedded Module

 

Hardware Guide

Description of the Application Interfaces

3.7 W_DISABLE# Signal

The W_DISABLE# signal is provided to allow users to disable wireless communications add-in cards. When the W_DISABLE# signal is asserted, all radios should be disabled. When the W_DISABLE# signal is not asserted, the radio may transmit signals if it is not disabled by other means such as software.

The W_DISABLE# signal is an active low signal with internal 100 kΩ pull-up resistor that disables radio operation when being asserted (driven low) by the system.

The combination of the software state and W_DISABLE# assertion state must be determined before the normal operation is resumed. Table 3-10 lists this requirement for W_DISABLE# and the software control setting. For example, the radio RF operation remains disabled unless both the hardware and software are set to enable the RF features of the card.

 

Table

3-9W_DISABLE_N signal

 

 

 

 

Pins

 

Name

 

Description

 

Direction to Module

 

 

 

 

 

 

 

 

 

 

 

20

 

W_DISABLE_N

Close wireless communications

Input

 

 

 

 

 

 

 

 

 

 

 

Table

3-10Radio operational states

 

 

 

 

 

 

 

 

 

W_DISABLE#

SW Control Setting*

Radio Operation

 

 

 

 

 

 

 

 

 

High

 

 

Enabled

Enabled

 

 

 

 

 

 

 

 

 

High

 

 

Disabled

Disabled

 

 

 

 

 

 

 

 

 

 

Low

 

 

Enabled

 

 

 

 

 

 

 

 

 

 

 

 

Low

 

 

Disabled

 

 

 

 

 

 

 

 

 

 

 

 

*This control setting is implementation specific; this column represents the collective intention of the host software to manage radio operation.

zIf you do not turn off the radio manually, the radio will be on when the module is powered on.

zEnd users need to turn off the radio in some situations such as when being on an airplane.

zAccording to Mini-PCIE specification, the radio must be turned off through hardware or software. Nearly all PC companies comply with this specification.

3.8LED_WWAN# Signal

The LED_WWAN signal of the EM820W can allow the voltage of 3.3 V and absorb the current from 5 mA to 40 mA. According to the given circuit, in order to reduce the current of the LED, a resistance of 1 kΩ must be placed in series with the LED.

Issue 01 (2010-12-31)

Huawei Proprietary and Confidential

14

Copyright © Huawei Technologies Co., Ltd.

 

 

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Contents Hardware Guide Issue DateNo Warranty About This Document HistoryVersion Date Chapter Descriptions Contents Recommendations for Designing the Module Antennas Electrical and Reliability FeaturesTables Figures Overview IntroductionOverall Description Feature DescriptionAbout This Chapter Function OverviewSMS Circuit Block Diagram1Circuit block diagram of the EM820W module Application Block DiagramMini PCI Express Interface Description of the Application InterfacesWDISABLE# Wdisablen UimresetVCC3V3 COEX1USB signal D+ Input/output USB signal D Input/outputActive-low LED signal Output Indicating the state Card Mini Card ground Not connectedPower Supply Time Sequence Power Sources and GroundsName Pins Minimum Type Maximum VCCParameter Remarks USB SignalsTimeNominal value Unit Name Pin Description Direction to ModuleUsim Interface Schematic Reference Usim SignalsPin Name Description UIM/SIMDesign Guide 2Vcc Minimum Maximum7Vcc SIM CLK requirements 7Vcc8SIM IO requirements Certification TestVcc Vcc Vcc+0.3LEDWWAN# Signal WDISABLE# SignalPins Name Description Direction to Module SW Control Setting Radio OperationPins Name Description Additional Direction to Module 11LEDWWAN signalLedwwan IF*R+VF+IF*100 =VCCWakenbn Signal NC PinsNC pins are not internally connected in the EM820W Operating Frequencies RF SpecificationsConducted RF Measurement Test EnvironmentTest Standards Conducted Rx Sensitivity and Tx PowerConducted Receive Sensitivity EM820W Test Value dBm3GPP Protocol EM820W Test Value dBm Claim dBm Min Type Max Conducted Transmit PowerAntenna Design Requirements Antenna Design IndicatorsUMTS900 UMTS850DCS PCSEnvelope Correlation Coefficient Interference 3 GSM/WCDMA Antenna RequirementsGSM/WCDMA Antenna Requirements Passive Tests Radio Test EnvironmentRecommendations for Designing the Module Antennas Design RecommendationsESD Protection for the Antenna Interface Issue 01 Huawei Proprietary and Confidential Electrical and Reliability Features Working and Storage Temperatures and HumidityExtreme Working Conditions Specification Minimum Value Maximum Value Unit Electrical Criteria of Application InterfacesParameter Description Minimum Value Power Supply Power Supply FeaturesPower Consumption Power Voltage Tolerance Peak Maximum Normal MaximumHsdpa ConfigurationHsupa Description Test Value UnitsGPRS900 225 Up/1 DownEDGE850 250 Up/1 Down 351 488 165 217 293Reliability Features Scenario Idle Suspend Unit Offline Enabled DisabledTest Condition Standard Test Condition Standard EMC and ESD Features Dimensions and Interfaces Mechanical SpecificationsDimensions of the Mini PCI Express Connector Dimensions and Interfaces of EM820WInstalling the EM820W on the Main Board of PC Specification Selection for FastenersIssue 01 Huawei Proprietary and Confidential Romoving the EM820W from the Main Board of PC 1Circuits of typical interfaces in the EM820W module Appendix a Circuits of Typical InterfacesAcronym or Abbreviation Expansion Appendix B Acronyms and AbbreviationsPbcch NTCPCB PDU

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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