Huawei EM820W USB Signals, Parameter Remarks, TimeNominal value Unit, VOHmin VOLmax VIHmin VILmax

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HUAWEI EM820W HSPA+ PC Embedded Module

 

Hardware Guide

Description of the Application Interfaces

Figure 3-1HUAWEI EM820W power supply time sequence.

Parameter Remarks

Tpd

Power Valid to USB D+ high

Time(Nominal value)

Unit

 

 

3.24

sec

 

 

3.5 USB Signals

The EM820W is compliant with USB 2.0 specification. It supports full-speed (12 Mbit/s) and high-speed (480 Mbit/s) modes when acting as a peripheral and supports low-speed, full-speed, and high-speed modes when acting as a host. The USB 2.0 specifications allow peripherals to support any one or more of these speeds. To ensure best performance, the PC USB host controller should support high-speed mode when using the EM820W USB high-speed mode.

Table 3-3 USB pins

Name

Pin

Description

Direction to Module

 

 

 

 

USB D-

36

USB data signal D-

Input/output

 

 

 

 

USB D+

38

USB data signal D+

Input/output

 

 

 

 

To minimize the RF radiation through the PCI-E interface, you can add a 33 pF ceramic capacitor in the ground on every pin of the PCI-E on the host side except USB D+/D-.

The USB interface is powered directly from the 3.3 V supply. The USB input/output lines are compatible with the USB2.0 3.3 V signal specifications.

Table 3-4USB signal DC characteristics

VOHmin

VOLmax

VIHmin

VILmax

 

 

 

 

2.8 V

0.3 V

2 V

0.8 V

 

 

 

 

Issue 01 (2010-12-31)

Huawei Proprietary and Confidential

9

Copyright © Huawei Technologies Co., Ltd.

 

 

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Contents Issue Date Hardware GuideNo Warranty History About This DocumentVersion Date Chapter Descriptions Contents Electrical and Reliability Features Recommendations for Designing the Module AntennasTables Figures Introduction OverviewFeature Description Overall DescriptionAbout This Chapter Function OverviewCircuit Block Diagram SMSApplication Block Diagram 1Circuit block diagram of the EM820W moduleDescription of the Application Interfaces Mini PCI Express InterfaceUimreset WDISABLE# WdisablenVCC3V3 COEX1USB signal D Input/output USB signal D+ Input/outputActive-low LED signal Output Indicating the state Card Mini Card ground Not connectedPower Sources and Grounds Power Supply Time SequenceName Pins Minimum Type Maximum VCCUSB Signals Parameter RemarksTimeNominal value Unit Name Pin Description Direction to ModuleUsim Signals Usim Interface Schematic ReferencePin Name Description UIM/SIMDesign Guide Minimum Maximum 2Vcc7Vcc SIM CLK requirements 7VccCertification Test 8SIM IO requirementsVcc Vcc Vcc+0.3WDISABLE# Signal LEDWWAN# SignalPins Name Description Direction to Module SW Control Setting Radio Operation11LEDWWAN signal Pins Name Description Additional Direction to ModuleLedwwan IF*R+VF+IF*100 =VCCNC Pins Wakenbn SignalNC pins are not internally connected in the EM820W RF Specifications Operating FrequenciesConducted RF Measurement Test EnvironmentConducted Rx Sensitivity and Tx Power Test StandardsConducted Receive Sensitivity EM820W Test Value dBmConducted Transmit Power 3GPP Protocol EM820W Test Value dBm Claim dBm Min Type MaxAntenna Design Indicators Antenna Design RequirementsUMTS850 UMTS900DCS PCSEnvelope Correlation Coefficient 3 GSM/WCDMA Antenna Requirements InterferenceGSM/WCDMA Antenna Requirements Radio Test Environment Passive TestsDesign Recommendations Recommendations for Designing the Module AntennasESD Protection for the Antenna Interface Issue 01 Huawei Proprietary and Confidential Working and Storage Temperatures and Humidity Electrical and Reliability FeaturesExtreme Working Conditions Electrical Criteria of Application Interfaces Specification Minimum Value Maximum Value UnitParameter Description Minimum Value Power Supply Features Power SupplyPower Consumption Power Voltage Tolerance Peak Maximum Normal MaximumConfiguration HsdpaHsupa Description Test Value Units225 Up/1 Down GPRS900EDGE850 250 Up/1 Down 351 488 165 217 293Scenario Idle Suspend Unit Offline Enabled Disabled Reliability FeaturesTest Condition Standard Test Condition Standard EMC and ESD Features Mechanical Specifications Dimensions and InterfacesDimensions of the Mini PCI Express Connector Dimensions and Interfaces of EM820WSpecification Selection for Fasteners Installing the EM820W on the Main Board of PCIssue 01 Huawei Proprietary and Confidential Romoving the EM820W from the Main Board of PC Appendix a Circuits of Typical Interfaces 1Circuits of typical interfaces in the EM820W moduleAppendix B Acronyms and Abbreviations Acronym or Abbreviation ExpansionNTC PbcchPCB 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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