Huawei EM820W manual Power Supply Features, Power Consumption

Page 37

HUAWEI EM820W HSPA+ PC Embedded Module

 

Hardware Guide

Electrical and Reliability Features

5.5 Power Supply Features

5.5.1 Power Supply

The EM820W receives its power supply from a 3.3 V power source, which must satisfy all requirements of PCI Express Mini CEM specifications, such as voltage tolerance and peak and normal current. The detailed requirements are listed in Table 5-3.

Table 5-3Power requirements

Power

Voltage Tolerance

Peak (Maximum)

Normal (Maximum)

 

 

 

 

3.3 V

±9%

2750 mA

1100 mA

 

 

 

 

In burst transmit mode of GSM/GPRS/EDGE, the instantaneous current of the module will exceed 2.75 A, which will pull down the power voltage transitorily and perhaps result in the reset of the module or host. In order to prevent this situation, you can add a large bulk capacitor beside the module on the host side (at least two 330uF capacitors).

5.5.2 Power Consumption

The power consumptions of the EM820W in different scenarios are listed in Table 5-4, Table 5-5 and Table 5-6 respectively.

Table 5-4DC power consumption (HSPA/WCDMA)

Description

Band

Test Value

Units

Power (dBm)

 

 

 

 

 

WCDMA

Band I

284

mA

1 dBm Tx Power

 

 

 

 

 

 

 

336

 

10 dBm Tx Power

 

 

 

 

 

 

 

544

 

24 dBm Tx Power

 

 

 

 

 

 

Band II

289

mA

1 dBm Tx Power

 

 

 

 

 

 

 

340

 

10 dBm Tx Power

 

 

 

 

 

 

 

606

 

24 dBm Tx Power

 

 

 

 

 

 

Band V

293

mA

1 dBm Tx Power

 

 

 

 

 

 

 

317

 

10 dBm Tx Power

 

 

 

 

 

 

 

501

 

24 dBm Tx Power

 

 

 

 

 

 

Band VIII

291

mA

1 dBm Tx Power

 

 

 

 

 

 

 

310

 

10 dBm Tx Power

 

 

 

 

 

 

 

517

 

24 dBm Tx Power

 

 

 

 

 

Issue 01 (2010-12-31)

Huawei Proprietary and Confidential

30

Copyright © Huawei Technologies Co., Ltd.

 

 

Page 36 Page 38
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Page 36 Page 38
Contents Hardware Guide Issue DateNo Warranty History About This DocumentVersion 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 =VCCNC Pins Wakenbn SignalNC 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 3 GSM/WCDMA Antenna Requirements InterferenceGSM/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 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 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 293Scenario Idle Suspend Unit Offline Enabled Disabled Reliability FeaturesTest 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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