Huawei MS2131 Guide

MS2131
Hardware Design Guide
Issue 02
Date 2017-1-13

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MS2131
Hardware Design Guide
About This Document
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About This Document
Change History
Issue Date Chapter Note
V1.0 2014-9-20 All Initial Release
V1.1 2017-1-13 6.3.2 Modify Peripheral
Staking Requirements

MS2131
Hardware Design Guide
Contents
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4
Contents
1 Introduction ...........................................................................................................................6
2 Precautions.............................................................................................................................7
3 MS2131 Overall Description ................................................................................................8
3.1 About This Chapter...............................................................................................................................................................8
3.2 Product Information..............................................................................................................................................................8
3.3 Function Overview ...............................................................................................................................................................9
3.4 Circuit Diagram ..................................................................................................................................................................10
3.5 Port Application Diagram...................................................................................................................................................11
4 MS2131 Interface Features and Design Requirements ....................................................12
4.1 About This Chapter.............................................................................................................................................................12
4.2 MS2131 Interface Introduction..........................................................................................................................................12
4.2.1 USB Port and Reference Circuits ...................................................................................................................................12
4.2.2 Power Port Introduction ..................................................................................................................................................13
4.3 SIM Card Port Introduction ...............................................................................................................................................14
5 MS2131 RF Features and Design Requirements............................................................... 15
5.1 About This Chapter.............................................................................................................................................................15
5.2 Working Bands....................................................................................................................................................................15
5.3 Wireless Performance Specifications ................................................................................................................................16
5.3.1 TIS ....................................................................................................................................................................................16
5.3.2 TRP ...................................................................................................................................................................................16
5.4 Antenna Design Requirements...........................................................................................................................................16
5.5 Antenna Test Environment.................................................................................................................................................19
6 MS2131 Structure Features and Design Requirements....................................................21
6.1 About This Chapter.............................................................................................................................................................21
6.2 Dimensions and Weight......................................................................................................................................................21
6.3 MS2131 Design Requirements Addressing the Host Structure.......................................................................................22
6.3.1 USB Connector Outline Dimensions..............................................................................................................................22
6.3.2 MS2131 Peripheral Staking Requirements....................................................................................................................24
7 MS2131 Power Design Guide.............................................................................................26
7.1 About This Chapter.............................................................................................................................................................26

MS2131
Hardware Design Guide
Contents
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7.2 MS2131 Power Supply.......................................................................................................................................................26
7.3 MS2131 Power Requirements in 2G Mode ......................................................................................................................26
7.4 MS2131 Power Requirements in 3G Mode ......................................................................................................................28
7.5 MS2131 Power Consumption Features.............................................................................................................................29
7.6 Peripheral Power Design Requirements............................................................................................................................29
7.6.1 Recommended Power Supply Structure.........................................................................................................................29
7.6.2 Derating Requirements....................................................................................................................................................30
7.6.3 Peripheral Power Supply Design Rules..........................................................................................................................30
8 MS2131 PCB Design Guide................................................................................................31
8.1 General PCB Design Rules ................................................................................................................................................31
8.2 Power Design ......................................................................................................................................................................31
8.3 Cable Routing Rules...........................................................................................................................................................32
8.3.1 Power Design ...................................................................................................................................................................32
8.3.2 USB Signal Cable Routing Design.................................................................................................................................32
8.3.3 Grounding Measure.........................................................................................................................................................33
9 MS2131 ESD Design Guide................................................................................................34
9.1 PCB Design Recommendations for the Host....................................................................................................................34
9.2 Shell Design Recommendations for the Host ...................................................................................................................34
10 MS2131 Electrical and Reliability Features..................................................................... 35
10.1 About This Chapter...........................................................................................................................................................35
10.2 Ultra Working Conditions ................................................................................................................................................35
10.3 Working and Storage Environment..................................................................................................................................36
10.4 Power Features..................................................................................................................................................................36
10.4.1 Input Power....................................................................................................................................................................36
10.4.2 Working Current ............................................................................................................................................................36
10.5 Reliability Features...........................................................................................................................................................36
11 Appendix ............................................................................................................................40
11.1 Appendix One MS2131 Power Consumption Data in Different Scenarios ..................................................................40
11.2 Appendix Two MS2131 OTA Data ..................................................................................................................................42
11.3 Appendix Three MS2131 Thermal Test...........................................................................................................................44

MS2131
Hardware Design Guide
Introduction
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1 Introduction
This document describes the MS2131's hardware specifications, port design requirements,
design guide, and working principles. The next five chapters describe the MS2131's
specifications and design requirements of its host. Chapter 6 to Chapter 9 provide details of
the MS2131'S working principles and design guides. Chapter 10 introduces the MS2131's
electrical features and reliability.
Upon learning this document, you will understand the MS2131's port standards, electricity
supply characteristics, design requirements, and product information. The document provides
you reference for related design.

MS2131
Hardware Design Guide
Precautions
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2 Precautions
This chapter describes the precautions for using the MS2131, especially for the user device or
host design. If not properly used, the MS2131 may not function normally and require design
changes on the host.
1. The MS2131 has strict peripheral power supply requirement. Strictly follow the design
requirements in Chapter 7 when designing the power supply circuits. Otherwise, cases
may occur that the board restarts in 2G large power events.
2. The MS2131 has its antennas embedded. Strictly follow the stacking design
requirements in section 5.4 "Antenna Design Requirements" when designing a host.
Otherwise, the antennas may deteriorate. As a result, exceptions, such as network access
fa ilures and call failures, may occur and adversely affect user experience.
Pay attention to the preceding precautions, especially for designing the host.

MS2131
Hardware Design Guide
MS2131 Overall Description
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3 MS2131 Overall Description
3.1 About This Chapter
This chapter describes the MS2131's basic information, functions, circuit diagram, and
application ports to help you understand its application scenarios and feasible functions for
future usage and integration.
3.2 Product Information
HUAWEI MS2131 (MS2131 for short) is a wireless termina l de vice that implements
high-speed wireless network access and supports various network modes as follows:
HSPA+ (High Speed Packet Access+)
UMTS (Universal Mobile Telecommunications System)
EDGE (Enhanced Data Rates for Global Evolution)
GPRS (General Packet Radio Service)
GSM (Global System for Mobile Communications)
The MS2131 supports the following services:
HSUPA-based packet services
HSPA+/UMT-based high-speed packet services
EDGE/GPRS-based packet services
WCDMA/GSM short message service (SMS)
The MS2131 can be connected to a host over a USB port to implement data card functions.
In the coverage area of the HSPA+/UMTS or EDGE/GPRS/GSM network, you can access
wireless networks, use SMS for communication, send and receive emails, and more.
An enhanced user experience is ensured by the MS2131 as it provides high-speed connectivity,
reliable performance, and convenient operations. With the Universal Plug and Play (UPnP)
service, the MS2131 can be connected to USB port–supported devices to implement the
2G/3G communication. The MS2131 authentication is independent from its peripherals, and
therefore, users do not need to authenticate the MS2131 by themselves.

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Hardware Design Guide
MS2131 Overall Description
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3.3 Function Overview
Table 3-1 Product features
Product Features Description
Working bands HSPA+/WCDMA 2100/1900/900/850 MHz
EDGE/GPRS/GSM 1800/1900/900/850 MHz
Chipset platform Hi6758
Working
temperature
–20°C to +55°C
Stora ge
temperature
–40°C to +70°C
P ow er vo lta ge 4.75 V to 5.25 V (5 V is recommended)
Protocol WCDMA/HSPA/HSPA+ (R7)
AT commands For details, see AT Command Interface Specification.
Application
interfaces
One standard SIM card slot (3 V or 1.8 V)
USB2.0 port
Antenna interface Embedded FPC support antenna
TS-5 external antenna port
SMS Text messages in TEXT mode
Data services WCDMA CS domain: UL 64 kbps/DL 64 kbps
WCDMA/HSPA+ PS domain: DL 21 Mbps(64QAM)/UL 5.76 Mbps
HSDPA Category 14
GSM CS domain: 9.6/14.4 kbps
GPRS: UL 85.6 kbps/DL 85.6 kbps
EDGE: only DL 236.8 kbps
Physical features Dimensions: 85 mm x 27 mm x 12.3 mm (33.5 in x 10.6 in x 4.8 in)
Weight: about 22 g
Certification CE, FCC, and GCF

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Hardware Design Guide
MS2131 Overall Description
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3.4 Circuit Diagram
The MS2131 contains the following functional modules, as shown in Figure 3-1.
Baseband processor (BB) and RF processor (RTR)
Nand flash
19.2 MHz crystal resonator
RF circuit
Antenna
USB2.0 port
Figure 3-1 MS2131function block diagram

MS2131
Hardware Design Guide
MS2131 Overall Description
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3.5 Port Application Diagram
The MS2131 contains the following ports, as shown in Figure 3-2.
USB2.0 port
SIM card slot (1.8 V or 3.0 V)
TS-5 external antenna port
Figure 3-2 MS2131 application diagram
MS2131
Application interfaces
USB SIM TS-5
SIM
card
External
antenna
RF

MS2131
Hardware Design Guide
MS2131 Interface Features and Design Requirements
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4 MS2131 Interface Features and Design
Requirements
4.1 About This Chapter
This chapter describes the port connector specifications and usage requirements of the
MS2131. Strictly follow the specified design requirements when designing the interface
circuits of a host.
4.2 MS2131 Interface Introduction
4.2.1 USB Port and Reference Circuits
The MS2131 communicates with the host over the USB port, which supports the USB2.0
protocol. The MS2131 has the USB signals adjusted and provides build-out circuits. The host
must be able to perform impedance matching and protection. Figure 4-1 shows the reference
circuits.
Table 4-1 Signals on the USB port
Pin No. Signal Name I/O Description
1 USB_D+ I/O USB differential data signal+
2 USB_D- I/O USB differential data signal-

MS2131
Hardware Design Guide
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Figure 4-1 USB port reference circuit diagram
The serial impedance of the USB differential data cables depends on the actual situation. The USB
cable routing design must strictly follow the USB2.0 protocol requirements. Cable routing must be
differentiated mode. The control impedance must be 90 Ω.
Electro-static discharge (ESD) components must be as close to the USB port as possible. It is
recommended that you use components with a rated reverse working voltage of 5 V and a junction
capacitance less than 10 pF.
4.2.2 Power Port Introduction
Table 4-2 Power pins
Signal
Name
I/O Description Direct Current Features (V)
Minimum
Value
Typical
Value
Maximum
Value
GND P Power ground
VBUS P USB power supply 4.75 5 5.25
The working power of the MS2131 is provided through the USB port with an input voltage
range from 4.75 V to 5.25 V (typical value: 5 V). Ensure that the power pins are properly
connected during the use of the MS2131 as to maintain its normal performance.
When the MS2131 is dedicated for different applications, attach importance to the power
supply design. In some network environments, when the MS2131works at its largest power
capacity (for example, when it works in GSM mode, a USB voltage dip may occur. Therefore,
make sure the power supply voltage for the host is 3.5 V at the minimum. Otherwise, the
MS2131 may restart.
External power supplies with the current output capacity larger than 2 A are recommended
and that a capacitor of larger than 300 μF and a decoupling capacitor of 0.1 μF must be
paralleled at the power port of the host. When the MS2131 works in GSM mode, its peak
current can reach 2 A. To prevent the MS2131's voltage from dropping to lower than 3.5 V
and help ensure the MS2131 function properly, place a large-capacity capacitor (at least 300
μF) near the USB port.
If the host is powered by batteries, configure a control switching diode or current limiting
chip between the battery power and the MS2131 power port. If a DC/DC converter or

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Hardware Design Guide
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low-dropout regulator (LDO) is used for the power supply, the transient current capacity must
be considered.
4.3 SIM Card Port Introduction
A standard SIM card port is embedded in the MS2131. The port supports the 3.0 V and 1.8 V
SIM cards. No external design is required.

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Hardware Design Guide
MS2131 RF Features and Design Requirements
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5 MS2131 RF Features and Design
Requirements
5.1 About This Chapter
This chapter describes the MS2131's RF parameters, such as its working bands and wire less
performance specifications, to help you understand the basic MS2131 RF features. As the
design of the host imposes a great impact on the MS2131's wireless performance, this chapter
provides detailed requirements for the host layout and stacking design. The antenna test
environment is also introduced to help you understand the wireless performance test methods
for the MS2131.
5.2 Working Bands
Table 5-1 describes the working bands that the MS2131 supports.
Table 5-1 MS2131 working bands
Working Band Tx Rx
UMTS Band I 1920–1980 MHz 2110–2170 MHz
UMTS Band II 1850–1910 MHz 1930–1990 MHz
UMTS Band V 824–849 MHz 869–894 MHz
UMTS Band VIII 880–915 MHz 925–960 MHz
GSM1900 1850–1910 MHz 1930–1990 MHz
GSM1800 1710–1785 MHz 1805–1880 MHz
GSM 900 880–915 MHz 925–960 MHz
GSM 850 824–849 MHz 869–894 MHz

MS2131
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5.3 Wireless Performance Specifications
5.3.1 TIS
Total Isotropic Sensitivity (TIS) is an important specification that determines the MS2131's
receiving performance. Table 5-2 describes the TIS specifications of the MS2131.
Table 5-2 MS2131 TIS specifications
Frequency
Band W2100 W1900 W900 W850 G1900 G1800 G900 G850
TIS
specification
(dBm)
–103 –101.5 –100 –98.5 –98.5 –100 –100 –98.5
The preceding design specifications can be realized only when the MS2131 is in optimal layout with
comprehensive shielding measures. Strictly follow the antenna design and stacking requirements to help
realize the optimal MS2131 performance.
5.3.2 TRP
Total Radiated Power (TRP) is an important transmission performance specification of the
MS2131. Table 5-3 describes the optimal TRP specifications of the MS2131.
Table 5-3 MS2131 TRP specifications
Frequency
Band W2100 W1900 W900 W850 G1900 G1800 G900 G850
TRP
specification
(dBm)
18 16.5 18 16.5 22.5 24 27 25.5
The preceding TRP specifications can be realized only when the MS2131 is in optimal layout. Therefore,
strictly follow the antenna design and stacking requirements to help realize the optimal MS2131
performance.
5.4 Antenna Design Requirements
The MS2131 has its antennas embedded and therefore, you do not need to design the antenna.
To ensure the MS2131 antenna performance, the following layout requirements shall be met:
1. The USB dongle be connected to a PCB that has a dimension not less than 10 cm x 10
cm (L x W) (as ①in Figure 5-2). The larger the PCB, the better the antenna
performance can be.
2. If the PCB is approximately a square, the layout shown in Figure 5-2 (excluding the ②
part) be adopted. The USB dongle is placed in the upper or lower part of the PCB side

MS2131
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(as ③in Figure 5-2). It is not recommended that the USB dongle be placed in the middle
of the PCB (as ⑧and ⑨in Figure 5-4).
3. The USB socket must be properly grounded to the PCB to ensure the optimal antenna
performance. It is not recommended that the PCB extend to the side of the USB dongle.
If this is required (as ②in Figure 5-2), reserve a minimum distance of 5 mm between the
USB dongle and the PCB.
4. Ensure that the USB dongle is in an open area without any other metals shielding around
(such as an earpiece or loudspeaker), except for cases of recommended layouts. If metals
cannot be avoided, a distance larger than 2 cm is required between the USB dongle and
the metal.
5. If there are other antennas in auxiliary devices, the antennas must keep a distance from
the USB dongle to avoid coupling.
6. If the diversity antenna (as ④in Figure 5-2) is in one side of the USB dongle, the
clearance opening should be faced outwards (as shown in Figure 5-2) to ensure the
optimal antenna performance.
7. In order to minimize devices' impact to the USB dongle, corollary equipment must be
filtered or shielded
8. Do not place any components that adversely affect the antenna performance on the top of
the USB dongle, especially of the main antenna (as ⑤in Figure 5-2). The antenna
performance will decrease by at least 1.5 dB if any adverse effect occurs.
9. It do not place any metal components around the antenna. Reference Figure 5-3.
Follow the preceding requirements to ensure the optimal MS2131 performance. If any
discrepancy exists, the MS2131 may fail to connect to the network or provide data, voice, or
SMS services.
Figure 5-1 MS2131 antenna area
Main
antenna
Diversity antenna

MS2131
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Figure 5-2 Recommended peripheral layout for the MS2131
Figure 5-3 Two common PCB layouts
Layout 1: The USB dongle is embedded in the longer edge of the PCB. Layout 2: The USB dongle is embedded in the shorter edge of the PCB.
If the terminal device is a rectangle (such as a POS device), the layouts shown in Figure 5-3
are recommended.
1
L
min
L
①
②
③
④
⑤

MS2131
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Figure 5-4 Two incorrect layouts
Layout 1: The USB dongle is embedded in the middle of the shorter edge.Layout 2: The USB dongle is embedded in the middle of the longer edge.
Figure 5-4 shows two incorrect layouts with the USB dongle embedded in the middle of the
PCB. The omni-directivity of the antenna deteriorates and the efficiency decreases due to the
closed space where the antennas are.
Strictly follow the antenna layout requirements and the stacking requirements specified in
section 6.3.2 "MS2131 Peripheral Staking Requirements" when designing the system. If you
fail to follow the requirements, the TRP and TIS specifications of the MS2131 will deteriorate,
and exceptions, such as network access failures and call failures, will occur.
5.5 Antenna Test Environment
The tests of antenna efficiency, gain, radiation pattern, and TRP and TIS specifications can be
performed in a microwave testing chamber. The following describes the test items in detail:
Passive tests:
−Antenna efficiency
−Antenna gain
−Antenna radiation pattern
−Envelope correlation coeffic ient
Active tests:
−TRP: GSM and WCDMATIS: GSM and WCDMA
CAUTION