Huawei EM820W manual Power Sources and Grounds, Power Supply Time Sequence, Vcc

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HUAWEI EM820W HSPA+ PC Embedded Module

 

 

Hardware Guide

 

 

Description of the Application Interfaces

 

 

 

 

 

 

 

 

Definition of the EM820W Mini PCI Express pins

 

 

 

 

 

 

 

 

 

 

Pin

 

 

Mini PCI

HUAWEI Pin

Additional

Direction to

 

No.

 

 

Express

Description

Description

Module

 

 

 

 

Standard

 

 

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

50

 

 

GND

GND

Mini Card Ground.

-

 

 

 

 

 

 

 

 

 

51

 

 

Reserved

NC

Not connected.

-

 

 

 

 

 

 

 

 

 

52

 

 

3.3Vaux

VCC_3V3

3.3V DC supply rail

Input

 

 

 

 

 

from the PC side.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.3 Power Sources and Grounds

The PCI Express Mini Card provides two power sources: one is 3.3 Vaux (+3.3 Vaux) and the other is 1.5 V (+ 1.5 V). For the EM820W, however, +3.3 Vaux is the only voltage supply that is available. The input voltage is 3.3 V±9%, as specified by PCI

Express Mini CEM Specifications 1.2.

Table 3-2Power and ground specifications

Name

Pins

Minimum

Type

Maximum

 

 

 

 

 

VCC

2, 24,39, 41, and 52

3.0 V

3.3 V

3.6 V

 

 

 

 

 

GND

4, 9, 15, 18, 21, 26, 27, 29, 34,

0 V

 

 

 

35, 37, 40, 43, and 50

 

 

 

 

 

 

 

 

To minimize the RF radiation through the power lines, it is suggested to add ceramic capacitors of 10pF and 100nF in the ground beside the Mini PCI Express connector on the host side.

3.4 Power Supply Time Sequence

Figure 3-1 shows the PCIE with 3.3 V voltage and USB D+ power supply time sequence.

Issue 01 (2010-12-31)

Huawei Proprietary and Confidential

8

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 IntroductionFunction Overview Feature DescriptionOverall Description About This ChapterSMS Circuit Block Diagram1Circuit block diagram of the EM820W module Application Block DiagramMini PCI Express Interface Description of the Application InterfacesCOEX1 UimresetWDISABLE# Wdisablen VCC3V3Mini Card ground Not connected USB signal D Input/outputUSB signal D+ Input/output Active-low LED signal Output Indicating the state CardVCC Power Sources and GroundsPower Supply Time Sequence Name Pins Minimum Type MaximumName Pin Description Direction to Module USB SignalsParameter Remarks TimeNominal value UnitUIM/SIM Usim SignalsUsim Interface Schematic Reference Pin Name DescriptionDesign Guide 7Vcc Minimum Maximum2Vcc 7Vcc SIM CLK requirementsVcc Vcc+0.3 Certification Test8SIM IO requirements VccSW Control Setting Radio Operation WDISABLE# SignalLEDWWAN# Signal Pins Name Description Direction to ModuleIF*R+VF+IF*100 =VCC 11LEDWWAN signalPins Name Description Additional Direction to Module LedwwanWakenbn Signal NC PinsNC pins are not internally connected in the EM820W Test Environment RF SpecificationsOperating Frequencies Conducted RF MeasurementEM820W Test Value dBm Conducted Rx Sensitivity and Tx PowerTest Standards Conducted Receive Sensitivity3GPP Protocol EM820W Test Value dBm Claim dBm Min Type Max Conducted Transmit PowerAntenna Design Requirements Antenna Design IndicatorsPCS UMTS850UMTS900 DCSEnvelope 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 Voltage Tolerance Peak Maximum Normal Maximum Power Supply FeaturesPower Supply Power ConsumptionDescription Test Value Units ConfigurationHsdpa Hsupa250 Up/1 Down 351 488 165 217 293 225 Up/1 DownGPRS900 EDGE850Reliability Features Scenario Idle Suspend Unit Offline Enabled DisabledTest Condition Standard Test Condition Standard EMC and ESD Features Dimensions and Interfaces of EM820W Mechanical SpecificationsDimensions and Interfaces Dimensions of the Mini PCI Express ConnectorInstalling 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 AbbreviationsPDU NTCPbcch PCB

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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