HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide Contents Contents ............................1 1 Introduction 1.1 Overview ............................1 ..........................2 2 Overall Description 2.1 About This Chapter ........................2 2.2 Function Overview ........................2 2.3 Circuit Block Diagram ........................3 2.4 Application Block Diagram ......................
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6.2 Dimensions of the Mini PCI Express Connector ..............36 6.3 Specification Selection for Fasteners ..................37 6.3.1 Installing the EM820W on the Main Board of PC ............37 6.3.2 Romoving the EM820W from the Main Board of PC ............ 38 ...................40...
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Table 5-5 DC power consumption (GSM/GPRS/EDGE) ............32 Table 5-6 DC power consumption(Idle and Suspend) ..............33 Table 5-7 Test conditions and results of the mechanical reliability of the EM820W module . 34 Huawei Proprietary and Confidential Issue 01 (2010-12-09)
EM820W module) is used. This document helps you to understand the interface specifications, electrical features, and related product information of the EM820W module. To facilitate its use in different fields, relevant development guides document are also provided with the module, which can be obtained through Huawei website.
HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide Overall Description Overall Description 2.1 About This Chapter This chapter gives a general description of the EM820W module and provides: Function Overview Circuit Block Diagram Application Block Diagram 2.2 Function Overview Table 2-1 Feature...
European Conformity (CE), Federal Communications information Commission (FCC) 2.3 Circuit Block Diagram Figure 2-1 shows the circuit block diagram of the EM820W module. The application block diagram and major functional units of the EM820W module contain the following parts: Mobile data modem...
WAKE_NB_N Signal NC Pins 3.2 Mini PCI Express Interface The EM820W has a standard Mini PCI Express interface, which consists of several major signals, as shown in the following table. Table 3-1 Pin definitions of the Mini PCI-E Interface Definition of the EM820W Mini PCI Express pins...
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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 Mini PCI HUAWEI Pin Additional Direction to Express Description Description Module Standard Description 3.3Vaux VCC_3V3 3.3 V DC supply rails Input from the PC side.
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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 Mini PCI HUAWEI Pin Additional Direction to Express Description Description Module Standard Description PERp0 Not connected. Mini Card ground.
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 .
3.45 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.
SIM card may get destroyed. 3.6.1 USIM Interface Schematic Reference There is no SIM card interface circuit in the EM820W module, and users need to add the USIM interface circuit. Figure 3-2 shows the definition of interface signals and the typical USIM interface schematic.
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.
HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide Description of the Application Interfaces Table 3-8 SIM IO requirements Minimum Maximum 0.7Vcc –0.3 0.2 Vcc 0.7 Vcc Vcc+0.3 The V max of 0.45 V for the output is specified at an output current of 3 mA whereas the max of 0.4 V for the SIM IO input is specified at an input current of 1 mA.
Nearly all PC companies comply with this specification. 3.8 LED_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...
Figure 3-4 LED_WWAN# signal reference circuit diagram Normally, when the HUAWEI module is enabled, the LED is on, and when disabled, the LED is off. The wink mode of the LED can be customized according to the requirement of the client.
PC . This signal is used for 3G module to wake up the host. It’s designed as a OC gate, so it should be pulled up by the host and it’s active-low. 3.10 NC Pins The NC pins are not internally connected in the EM820W. Huawei Proprietary and Confidential Issue 01 (2010-12-09)
The instrument compensation needs to be set according to the actual cable conditions. 4.2.2 Test Standards Huawei modules meet all 3GPP test standards relating to both 2G and 3G. Each module has passed stringent tests in the factory, thus the quality of the modules is guaranteed.
In addition, the transmission cable from the antenna port of the EM820W to the antenna is also part of the antenna. The cable loss increases with the cable length and the frequency. It is recommended that the cable loss should be as low as possible, for example, U.FL-...
Antenna type Antenna direction The master antenna must be placed as near as possible to the EM820W to minimize the cable length. The slave antenna needs to be installed perpendicularly to the master antenna. The slave antenna can be placed farther away from the EM820W.
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HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide RF Specifications Frequency Transmit Conducted Wi-Fi Front End Band Frequency Transmit Isolator Filter Attenuation Power (dBm) (dB) (dB) GSM850 824–849 MHz GSM900 880–915 MHz 1710–1785 MHz 1850–1910 MHz S11 or VSWR S11 (return loss) indicates the degree to which the input impedance of an antenna matches the reference impedance (50 ohm).
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Take the RF transmission cable inside the laptop into account when measuring any of the preceding antenna indicators. Huawei cooperates with various antenna suppliers who are able to make suggestions on antenna design, for example, Amphenol, Skycross, Pulse etc.
To lessen the effects of interference sources on the module, you can use an LCD with optimized performance, shield the LCD interference signals, shield the signal cable of the board, or design filter circuits. Huawei is capable of making technical suggestions on radio performance improvement of the module. 4.4.3 GSM/WCDMA Antenna Requirements...
The antenna efficiency, antenna gain, radiation pattern, total radiated power (TRP), and TIS can be tested in a microwave testing chamber. Huawei has a complete set of OTA test environment (SATIMO microwave testing chambers and ETS microwave testing chambers). The testing chambers are certified by professional organizations and are applicable to testing at frequencies ranging from 380 MHz to 6 GHz.
HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide RF Specifications Figure 4-1 SATIMO microwave testing chamber 4.5 Design Recommendations Recommendations for Designing the Module Antennas The design recommendations are as follows: It is recommended that the module antennas are designed at the upper edge, left edge, or right edge of the laptop screen.
4.6 ESD Protection for the Antenna Interface In practical application, pay attention to the ESD protection for the antenna interface of the EM820W module. Incorrect operation may result in permanent damage to the RF components. Figure 4-3 shows the ESD protection circuit recommended for the antenna interface.
HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide RF Specifications Figure 4-3 ESD protection circuit recommended for the antenna interface It is recommended that you pay attention to the junction capacitance of the TVS diode when you choose the model of the TVS diode. Ensure that the junction capacitance of the TVS diode is lower than 1 pF.
Reliability Features EMC and ESD Features 5.2 Extreme Working Conditions Table 5-1 lists the extreme working conditions for the EM820W module. Using the EM820W module beyond these conditions may result in permanent damage to the module. 5.3 Working and Storage Temperatures and Humidity Table 5-1 lists the working and storage temperatures and humidity for the EM820W module.
°C storage Moisture [1]: When the EM820W module works at this temperature, all its RF indexes comply with the 3GPP TS 45.005 specifications. [2]: When the EM820W module works at this temperature, certain RF indexes do not comply with the 3GPP TS 45.005 specifications.
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.
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HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide Electrical and Reliability Features Description Band Test Value Units Power (dBm) (850M) 10 dBm Tx Power 24 dBm Tx Power Band Ⅷ 1 dBm Tx Power (900M) 10 dBm Tx Power 24 dBm Tx Power...
HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide Electrical and Reliability Features Table 5-5 DC power consumption (GSM/GPRS/EDGE) Description Test Value Units Configuration GPRS850 1 Up/1 Down 2 Up/1 Down 1 Up/1 Down 2 Up/1 Down GPRS900 1 Up/1 Down...
HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide Electrical and Reliability Features Description Test Value Units Configuration 4 Up/1 Down 1 Up/1 Down 2 Up/1 Down 4 Up/1 Down EDGE1900 1 Up/1 Down 2 Up/1 Down 4 Up/1 Down 1 Up/1 Down...
HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide Electrical and Reliability Features Table 5-7 Test conditions and results of the mechanical reliability of the EM820W module Item Test Condition Standard Low-temperature Temperature: –40±2ºC IEC60068 storage Test duration: 24 h High-temperature Temperature: 85±2ºC...
Ground plane: HUAWEI Wireless recommends a common ground plane for analog/digital/RF grounds. A metallic case or plastic casing with conductive paint is recommended, except for areas around the antenna. The HUAWEI EM820W Embedded Module does not include any protection against high voltage. Huawei Proprietary and Confidential Issue 01 (2010-12-09)
6.1 Dimensions and Interfaces 6.1.1 Dimensions and Interfaces of EM820W The dimensions of EM820W are 50.95 mm (length) × 30 mm (width) × 4.5 mm (height). Figure 6-1 shows the dimensions of EM820W in detail. Figure 6-1 shows the appearance of the interfaces on the EM820W.
6.3.1 Installing the EM820W on the Main Board of PC To install the EM820W on the main board of the PC, do the following: Step 1 Insert the Mini PCI Express connector of the EM820W into the WWAN Mini PCI Express interface on the main board of PC.
Mechanical Specifications Step 2 Press downwards to fix the EM820W in the module slot. Step 3 Use a screwdriver to fix the EM820W on the main board of the PC with two screws provided in the EM820W packing box. Step 4 Insert the connector of the main antenna into the MAIN antenna interface (M) of the EM820W according to the indication on the label of the EM820W.
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HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide Mechanical Specifications Step 2 Remove the two screws with the screwdriver. Step 3 Slide backwards the two clips to release the EM820W from the slot. Then, lift up the EM820W. Huawei Proprietary and Confidential Issue 01 (2010-12-09)
HUAWEI EM820W HSPA+ PC Embedded Module Appendix B Acronyms and Hardware Guide Abbreviations Appendix B Acronyms and Abbreviations Acronym or Abbreviation Expansion Baseband European Conformity Coding Scheme Circuit Switched Data direct current data circuit-terminating equipment direct memory access data terminal equipment...
HUAWEI EM820W HSPA+ PC Embedded Module Appendix B Acronyms and Hardware Guide Abbreviations Acronym or Abbreviation Expansion negative temperature coefficient PBCCH Packet Broadcast Control Channel printed circuit board protocol data unit Power manage Unit radio frequency RoHS Restriction of the use of certain Hazardous...