ZTE MW3736 WCDMA wireless data terminal User Manual user guide

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ZTE MW3736Hardware Design
User Manual
Intend to OEM Integrator Installation
Version：V1.0
Intend to OEM Integrator Installation
Copyright Statement
If you accept this manual of ZTE Corporation, it means that you have agreed to the following terms
and conditions; if you don’t agree, please stop using this manual.
The copyright of this manual belongs to ZTE Corporation. ZTE Corporation reserves any rights not
expressly granted in this manual. The contents in this manual are the proprietary information of
ZTE Corporation. This manual and any image, table, data or other information contained in this
manual may not be reproduced, transferred, distributed utilized or disclosed without the prior
written permission of ZTE Corporation.
and
are the registered trademark of ZTE Corporation. All other trademarks
appeared in this manual are owned by the relevant companies. Nothing contained in this manual
should be construed as granting, by implication, estoppel, or otherwise, any license or right to use
any trademarks displayed in this manual without the prior written permission of ZTE Corporation
or third‐party obligee.
This product conforms to the design requirements of relevant environment protection and
personal safety. The storage, usage and disposal of this product should comply with the product
user manual, relevant contracts or requirements of laws and regulation in relevant countries.
ZTE Corporation keeps the right to modify or improve the product described in the manual without
prior notice; and meanwhile keeps the right to modify or retract this manual.
If there is anything ambiguous in this manual, please consult ZTE Corporation or its distributor or
agent promptly.
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Version update description
Product version
Document version
V1.0
Document No.
Document update descriptions
Released for the first time
Writer
Document version
Date
V1.0
2012‐08‐07
第 II 页
Written by
Liu Changdi
Yu Xianwu
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Requested by
Approved by
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Important compliance information for North American users
The MW3736 Module has been granted modular approval for mobile applications. Integrators may use the
MW3736 Module in their final products without additional FCC certification if they meet the following
conditions. Otherwise, additional FCC approvals must be obtained.
1. At least 20cm separation distance between the antenna and the user’s body must be maintained at all
times.
2. To comply with FCC regulations limiting both maximum RF output power and human exposure to RF
radiation, the maximum antenna gain including cable loss in a mobile-only exposure condition must not
exceed 3dBi in the GSM850/WCDMA850 band and 5dBi for GSM1900/WCDMA1900 band.
3. The MW3736 Module and its antenna must not be co-located or operating in conjunction with any
other transmitter or antenna within a host device. This equipment complies with FCC RF radiation
exposure limits set forth for an uncontrolled environment.
4. A label must be affixed to the outside of the end product into which the MW3736 Module is
incorporated, with a statement similar to the following: For MW3736: This device contains FCC ID:
Q78-MW3736.
5. A user manual with the end product must clearly indicate the operating requirements and conditions
that must be observed to ensure compliance with current FCC RF exposure guidelines.
The end product with an embedded MW3736 Module may also need to pass the FCC Part 15 unintentional
emission testing requirements and be properly authorized per FCC Part 15.
Note: If this module is intended for use in a portable device, you are responsible for separate
approval to satisfy the SAR requirements of FCC Part 2.1093.
FCC NOTICE:
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired
operation.
Changes or modifications made to this equipment not expressly approved by ZTE Corporation may void the
FCC authorization to operate this equipment.
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With strong technical force, ZTE Corporation can provide CDMA/GPRS/WCDMA/GSM module
customers with the following all‐around technical support:
1. Provide complete technical documentation;
2. Provide the development board used for R&D, test, production, after‐sales, etc.
3. Provide evaluations and technical diagnosis for principle diagram, PCB, test scenarios;
4. Provide test environment;
ZTE Corporation provides customers with onsite supports, and also you could get supports through
telephone, website, instant messenger, E‐mail, etc.
第 IV 页
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Preface
Summary
This user manual mainly describes ZTE MW3736 module’s product principle diagram, module’s PINs,
hardware interfaces and module structure. This manual is used to instruct the users on the module’s
hardware design, and on the basis of this module, quickly and conveniently design different kinds of
wireless terminals.
Target Readers





System designing engineers
Mechanical engineers
Hardware engineers
Software engineers
Testing engineers
Description of contents:
This manual contains 5 chapters. See the table below:
1. Module’s General description. This chapter introduces MW3736 module’s basic technical
specification, relevant documents and abbreviations.
2. Module’s External Interfaces. This chapter introduces MW3736 module’s pin name and functions.
3. Module’s Electrical Characteristics. This chapter describes MW3736 module’s interface level,
power consumption, reliability, etc.
4. Description of Hardware Interfaces. This chapter describes MW3736’s hardware interfaces.
5. Mechanical Design. This chapter describes MW3736 module’s appearance diagram, assembly
diagram and PCB layout on the main board.
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Contents
MODULE’S GENERAL DESCRIPTION .......................................................................... 1
1.1
INTRODUCTION TO MODULE’S FUNCTIONS ..................................................... 1
1.2
MODULE’S PRINCIPLE BLOCK DIAGRAM .......................................................... 2
1.3
ABBREVIATIONS ................................................................................................... 3
DESCRIPTION OF MODULE’S EXTERNAL INTERFACES ........................................... 6
2.1
DEFINITIONS OF MODULE’S INTERFACES ........................................................ 6
2.2
ANTENNA INTERFACE ......................................................................................... 8
2.3
ANTENNA INTERFACE’S RF PERFORMANCE ................................................... 9
MODULE’S ELECTRICAL CHARACTERISTICS ......................................................... 10
3.1
DESCRIPTIONS OF INTERFACE LEVEL ........................................................... 10
3.2
POWER ON/OFF TIME SEQUENCE ................................................................... 10
3.3
RELIABILITY ........................................................................................................ 11
3.4
ESD ...................................................................................................................... 11
REFERENCE DESIGN OF INTERFACE CIRCUITS ..................................................... 13
4.1
POWER AND RESET .......................................................................................... 13
4.2
COM PORT .......................................................................................................... 14
4.3
UIM CARD INTERFACE....................................................................................... 17
4.4
AUDIO INTERFACE (OPTIONAL) ....................................................................... 18
4.5
WORK STATUS INDICATORS ............................................................................ 19
MECHANICAL DESIGN ................................................................................................ 20
5.1
APPEARANCE DIAGRAM ................................................................................... 20
5.2
MODULE’S ASSEMBLY DIAGRAM ..................................................................... 21
5.3
MODULE’S PCB ENCAPSULATION DIMENSIONS ............................................ 22
第 VI 页
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Module’s General Description
With 36‐PIN stamp‐hole interface, MW3736 module developed by ZTE Corporation is a kind of
WCDMA/GSM industrial module, which can be built in the Set‐Top‐Box, vehicle‐mounted terminals,
and enable users to get access to the Internet wirelessly and send/receive Emails, browse the web
pages, download at high speed and play online videos, etc.
It enables users to get access to the Internet any time in a place where WCDMA/GSM network is
covered. It also features in SMS, voice call, etc. and provides highly free and convenient solutions for
users in mobile data communication, and truly realizes the dream of mobile office.
MW3736 module is divided into two products with different frequency bands, respectively named
as MW3736_V1A and MW3736_V1B. They can be recognized through the silkscreen printed at the
bottom
of
it.
MW3736_V1A
GSM850/900/1800/1900;
while
corresponds
to
MW3736_V1B
the
frequency
corresponds
band
to
the
WCDMA850/1900,
frequency
WCDMA850/900/2100, GSM850/900/1800/1900.
This chapter mainly introduces the module’s basic functions and logic block diagrams.
1.1
Introduction to Module’s Functions
Table 1‐1 Module’s functions
Parameters
MW3736
Basic features
Frequency band
WCDMA850/1900、GSM850/900/1800/1900
Dimensions
39.50mm×31.00mm×2.65mm
Weight
10g
Work temperature
‐25℃~+65℃
Storage temperature
‐30℃~+85℃
Performance
Work voltage
3.6V~4.2V
Standard: 3.8V
Sleep current (Min.): 1mA
Idle current（Ave.）: 5mA@‐75dBm
Standard consumption
Talk current: 230mA@‐75dBm
Maximum current (instantaneous value):
1800mA@‐102dBm
Maximum output power
21dBm ~ 32.5dBm@‐102dBm
Rx. signal sensitivity
‐108dBm
Interface
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Parameters
MW3736
Connection method
36 Pin stamp‐hole
Antenna
U.FL‐R‐SMT 50ohm antenna connector
Integrated full duplex port
AT command, data transmission
UIM card socket level
1.8V /2.85V
Data service
Mode
WCDMA/ GSM/EDGE
Max. downlink data rate
14.4Mbps
Max. uplink data rate
5.76Mbps
Protocol
Internal TCP/IP and UDP/IP protocol stack
TCP server
Embedded FTP
SMS
Support TEXT/PDU mode
PTP MO/MT
SMS Cell Broadcast
Audio (optional)
PCM audio
Headset
Audio encoder EVRC & 13K QCELP
Volume control
Support DTMF
AT command settings
Common AT commands
ZTE exclusive AT commands
1.2
Module’s Principle Block Diagram
See MW3736’s major logic functions in the following block diagram:
Figure 1‐1 Module’s principle diagram
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MW3736_ principle diagram:
1.3
Abbreviations
Table 1‐2 Introduction to Abbreviations
ADC
Analog‐Digital Converter
AFC
Automatic Frequency Control
AGC
Automatic Gain Control
ARFCN
Absolute Radio Frequency Channel Number
ARP
Antenna Reference Point
ASIC
Application Specific Integrated Circuit
BER
Bit Error Rate
BTS
Base Transceiver Station
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CDMA
Code Division Multiple Access
CDG
CDMA Development Group
CS
Coding Scheme
CSD
Circuit Switched Data
CPU
Central Processing Unit
DAI
Digital Audio interface
DAC
Digital‐to‐Analog Converter
DCE
Data Communication Equipment
DSP
Digital Signal Processor
DTE
Data Terminal Equipment
DTMF
Dual Tone Multi‐Frequency
DTR
Data Terminal Ready
EFR
Enhanced Full Rate
EGSM
Enhanced GSM
EMC
Electromagnetic Compatibility
EMI
Electro Magnetic Interference
ESD
Electronic Static Discharge
ETS
European Telecommunication Standard
FDMA
Frequency Division Multiple Access
FR
Full Rate
GPRS
General Packet Radio Service
GSM
Global Standard for Mobile Communications
HR
Half Rate
IC
Integrated Circuit
IMEI
International Mobile Equipment Identity
ISO
International Standards Organization
ITU
International Telecommunications Union
LCD
Liquid Crystal Display
LED
Light Emitting Diode
MCU
Machine Control Unit
MMI
Man Machine Interface
MS
Mobile Station
PCB
Printed Circuit Board
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PCL
Power Control Level
PCS
Personal Communication System
PDU
Protocol Data Unit
PLL
Phase Locked Loop
PPP
Point‐to‐point protocol
RAM
Random Access Memory
RF
Radio Frequency
ROM
Read‐only Memory
RMS
Root Mean Square
RTC
Real Time Clock
SIM
Subscriber Identification Module
SMS
Short Message Service
SRAM
Static Random Access Memory
TA
Terminal adapter
TDMA
Time Division Multiple Access
TE
Terminal Equipment also referred it as DTE
UART
Universal asynchronous receiver‐transmitter
UIM
User Identifier Management
USB
Universal Serial Bus
VSWR
Voltage Standing Wave Ratio
ZTE
ZTE Corporation
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Description of Module’s External Interf aces
MW3736 module adopts 36pin stamp‐hole interface to connect externally.
2.1
Definitions of Module’s Interfaces
Table 2‐1 Definitions of module’s interface
VREG_USIM
GND
USIM_RST
GND
36
35
USIM_CLK
SIG_LED
34
USIM_DATA
PCM_DIN
33
32
31
30
29
NC
10
11
12
13
14
15
16
17
NC
V_MSME_1V8
18
VBAT
PCM
USB (Opti LED
onal)
UIM
GND
NC
NC
NC
USB_DM
USB_DP
ON/OFF
PCM_SYNC(/DSR
PCM_DOUT(DCD)
MW3736
UART
NC
GND
/PON_RESET
GND
RF_ANT
19
/DTR
/RTS
RI
NC
RXD
POWER
TXD
Pin
/CTS
ANT
Signal name
I/O
Basic functions
Remarks
No.
SIM card
interface
VREG_USIM
2.85V/1.8V power supply
USIM_RST
USIM card reset signal
USIM_CLK
USIM card clock cable
USIM_DATA
I/O
USIM card data cable
11
MIC1_N
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Differential audio input
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rights
28
27
26
25
24
23
22
21
20
VBUS
VBAT
Functions
PCM_CLK
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channel1 ‐
Reset
13
Power
Reset signal
1.8V, valid upon low
level
VBUS
USB power
+5V
16
VBAT
Module’s main power
3.3V‐4.2V
17
V_MSME_1V8
Digital power
Voltage output, 1.8V
18
VBAT
Module’s main power
3.3V‐4.2V
Power on/off control
1.8V, valid upon low
21
ON/OFF
/CTS
level
Clear to send
1.8V, valid upon low
level
22
RXD
Receive data
1.8V
23
TXD
Transmit data
1.8V
24
RI
Ringtone
1.8V
Request to send
1.8V, valid upon low
25
26
27
28
PCM
14
29
UART
/PON_RESET
(optional)
RTS
/DTR
PCM_DOUT
（DCD）
PCM_SYNC
（/DSR）
PCM_CLK
32
（WAKEUP）
level
Data terminal ready
1.8V, valid upon low
level
PCM data output
1.8V，duplex with DCD
PCM frame SYNC clock
1.8V，duplex with /DSR
PCM data clock
1.8V, duplexing pin. See
Note (1) for detailed
functions.
33
PCM_DIN
USB
30
USB_DP
I/O
USB data+
interface
31
USB_DM
I/O
USB data‐
LED
34
Antenna
19
GND
SIG_LED
RF_ANT
I/O
PCM data input
1.8V
Module’s working status
indicator
Antenna interface
GND
12
20
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35
36
Note:
（1） The default function is WAKEUP, and generally it is at high level. After entering the USB sleep
mode, the module needs to wake up the main controller (or PC) to trigger certain event (e.g.,
call or text message); in this case, it displays the level variation of “Low—High‐‐Low”, and
each state lasts for 1 second; after that, the PIN automatically becomes high level, and the
main controller (or PC) needs to send USB wakeup command to awaken the module.
（2） As the PCM function is enabled, it’s used as the CLK pin of the PCM. As the module enters the
sleep mode, there is high level at WAKEUP pin; when it needs to wake up the main controller
(or PC) if there is an incoming call at this moment, it displays the level variation of
“Low—High‐‐Low”, and each state lasts for 1 second; subsequently it displays the waveform
of the PCM CLK PIN. When it needs to wake up the main controller (or PC) if there is other
event such as text message, it displays the level variation of “Low—High‐‐Low”, and each
state lasts for 1 second; subsequently the PIN automatically becomes high level
2.2
Antenna Interface
Proper measures should be taken to reduce the access loss of effective bands, and good shielding
should be established between external antenna and RF connector. Besides, external RF cables should
be kept far away from all interference sources such as high‐speed digital signal or switch power
supply.
According to mobile station standard, stationary wave ratio of antenna should be between 1.1 and 1.5,
and input impedance is 50 ohm. Different environments may have different requirements on the
antenna’s gain. Generally, the larger gain in the band and smaller outside the band, the better
performance the antenna has. Isolation degree among ports must more than 30dB when multi‐ports
antenna is used. For example, between two different polarized ports on dual‐polarized antenna, two
different frequency ports on dual‐frequency antenna, or among four ports on dual‐polarized
dual‐frequency antenna, isolation degree should be more than 30dB.
Precautions of using PIN2 and RF connector:
Compatible design has been used on MW3736 RF external interface, therefore customers can
select reasonably according to the product form during the second‐time development of the module
to optimize the cost of BOM.
Program 1：
PIN2 is used as the antenna PIN. Pay attention to the following when using it as the antenna’s
feed PIN:
（1）The feed connected to PIN2 is 50ohm micro‐strip or strip line. To approach the module, put
π shape or F shape matching network for later tuning.
（2）The RF wires must be kept away from the GND, and generally the distance should be 3 times
of the width of RF wires.
（3）It’s forbidden to put some interference sources such as DCDC, WIFI module around RF wires
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or RF port
Program 2:
When using RF plug as the antenna feed, disconnect PIN2 from the main board and make sure
there are some clean areas below or around PIN2. Keep 2mm distance between the surface of PIN2
and GND, and drill holes below PIN2. It’s not suggested to use the compatible design of PIN2 at the
same time when using the RF connector.
Figure 2‐1 Antenna interface diagram
the maximum antenna gain is 3dBi for GSM850/WCDMA850 band and 5dBi for GSM1900/WCDMA1900
band.
2.3
Antenna Interface’s RF Performance
See the antenna interface’s RF performance in table 2‐2:
Table 2‐2 Antenna Interface’s RF Performance
MW3736_V1A:
Antenna
Interface’s RF
Performance
WCDMA850
WCDMA1900
GSM850
GSM1900
GPRS850
Module’s uplink
（MS‐>BTS）
824MHz‐849MHz
1850MHz‐1910MHz
824MHz‐849MHz
1850MHz‐1910MHz
824MHz‐849MHz
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Module’s downlink
（BTS‐>MS）
869MHz‐894MHz
1930MHz‐1990MHz
869MHz‐894MHz
1930MHz‐1990MHz
869MHz‐894MHz
Power
（dBm）
23 (+1/‐2)
23 (+1/‐2)
32+‐0.5
29 +‐0.5
30+‐0.5
© ZTE Corporation. All rights reserved.
Antenna
interface Rx.
sensitivity
< ‐110dBm
< ‐110dBm
< ‐108dBm
< ‐108dBm
< ‐108dBm
第9页
Intend to OEM Integrator Installation
GPRS1900
EDGE850
EDGE1900
1850MHz‐1910MHz
824MHz‐849MHz
1850MHz‐1910MHz
1930MHz‐1990MHz
869MHz‐894MHz
1930MHz‐1990MHz
28.5±0.5
32 +‐0.5
30+‐0.5
< ‐108dBm
< ‐108dBm
< ‐108dBm
Module’s Electrical Characteristics
This chapter mainly introduces the module’s electrical characteristics, including module’s
interface level, power consumption, reliability, etc.
3.1
Descriptions of interface level
Table 3‐1 Description of level of module’s main external interfaces
External
interfaces
High/low
level
UART
Min.
UIM
0.7*V_UART
Typical
Max.
0.3*V_UART
V_UART
Remarks
Internal
voltage
conversion
0.3*VREG_RUIM
0.7*VREG_RUIM VREG_RUIM
Among them, V_UART is 1.8V, and VREG_RUIM is 1.8V/2.85V.
3.2
Power on/off Time Sequence
The time sequence diagram indicates the whole power on/off process.
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Table 3‐1 Power on/off circuit time characteristics
3.3
Reliability
Before leaving the factory, the module has gone through a series of reliability tests, such as:
high/low temperature operation, high/low temperature storage, thermal shock, alternating
temperature humidity, etc. The test results conform to the requirements in the industry. List the
module’s work temperature in the table below:
Table 3‐3 Module’s temperature characteristics
Parameters
Descriptions
Min.
To
Normal
work
temperature
‐25℃
Limited
work
temperature
Ta
Ts
3.4
Module’s storage
temperature
‐30℃
‐40℃
Max.
Remarks
+65℃
+75℃
Basic
functions are
normal,
but
the
RF
performance
slightly drops.
+85℃
ESD
The module’s interface, antenna interface and UIM card interface all pass the standard ESD
performance testing.
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Table 3‐4 Module’s ESD characteristics
Interface
Antenna
interface
UIM
card
interface
©
第 12 页
Test items
Test
requirements
Performance
Air discharging
±8 kV
Nothing wrong
Contact
discharging
±６ kV
Nothing wrong
Air discharging
±8 kV
Nothing wrong
Contact
discharging
±６ kV
Nothing wrong
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Reference Design of Interf ace Circuits
This chapter describes the reference design of interface circuits and precautions according to the
module’s functions.
4.1
Power and Reset
See the reference design of power circuit in figure 4‐1.
Figure 4‐1 Power and reset circuit reference design diagram

Power design
The module is powered by VBAT. See the voltage characteristics in table 4‐1.
Table 4‐1 Voltage characteristics
Classification
MIN
TYPICAL
MAX（instantaneous）
Input voltage
3.6 V
3.7V
4.2 V
Input current
< 3mA (average)
‐‐
530mA（WCDMA）
1800mA（GSM）

Power on
The module will be normally powered off after connected to the power normally.
Provide one 4S ~ 6S low pulse to the module’s ON/OFF pin to turn on the module.
The time required to power on at each time depends on the module’s status. Usually, the low
level must last for at least 4 seconds.

Power off
Provide one 4S ~ 6S low pulse to the module’s ON/OFF pin to turn off the module.
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Reset

Provide one 3S low pulse to the module’s /RESET pin to reset the module.
After reset, the module will enter the power‐off status. Provide one at least 4S
module’s ON/OFF pin to turn on the module again.
low pulse to the
V_MSME_1V8
There is a voltage output pin with current adjuster on MW3736 module, which can be used to supply
external power to the board. The voltage of this pin and the voltage of baseband processor/memory
come from the same voltage adjuster. The voltage output is available only when the module is on. The
normal output voltage is 1.8V, and the user should absorb the current from this pin as little as
possible (less than 10mA). Generally, it is recommended to use this pin for pull‐up when matching the
level.
Other Advice
In order to make sure the data is saved safely, please don’t cut off the power when the module is
on. It’s strongly recommended to use the soft switch to turn off the mobile phone. If the interval
between the cut‐off and power‐on is less than 2 seconds, it would cause the module to automatically
power on.
4.2
COM Port
The module provides a full duplex UART interface, whose maximal data rate is 230.4kbps and
typical data rate is 115.2kbps. The external I/O level is 1.8V CMOS signal.
Precautions：
1）The module’s I/O level is 1.8V CMOS, and the level conversion is required when connected
with standard 3.3V logic circuit.(e.g., MCU or RS232 driver chip MAX3238). Otherwise, it might cause
unstable com ports because the level is not matched or cause damage to the module because it is at
high level for a long time.
For non 1.8V external UART, it needs to convert the level. Normally a dynatron is used to realize
the level conversion. As shown in figure 4‐2, the resistance is just for your information, please
calculate again during the design. The diode in the figure is Schottky diode (forward voltage drop:
0.3V). If you select other diode, please select one with smaller forward voltage drop to guarantee that
RXD_1V8’s level is below the threshold when inputting low level.
2）Port baud rate 115200 (by default), can be used for AT commands and MODEM. The hard flow
control is OFF by default.
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Figure 4‐2 UART interface level conversion
4）Connect to RXD and TXD only when there is no flow control in use;
When using hardware flow control to connect other processors, use RXD, TXD, /CTS and /RTS;
when used as Modem to connect to the PC, connect all IO signal cables (8 wires). Besides, the ringtone
signal will produce low level interruption upon an incoming call or text message. Select the port IO
signals for level conversion according to the specific conditions.
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Descriptions of UART interface:
Figure 4‐3 UART DCE－DTE connection relationship diagram
See the definitions of UART1 interface in table 4‐2.
Table 4‐2 Definitions of UART1 interface
Classification
No.
Definitions
I/O
Descriptions
Remarks
UART
(1.8V）
22
UART_RX
Receive data
DTE transmits serial data
25
UART_RTS
Ready to send
DTE informs DCE to
send
23
UART_TX
Transmit data
DTE receives serial data
26
UART_DTR
Data terminal ready
DTE is ready
21
UART_CTS
Clear to send
DCE has switched to Rx.
mode
24
UART_RI
Ringtone indication
Inform DTE upon a
remote call
28
UART_DSR
Data set ready
DCE is ready
27
UART_DCD
Carrier wave detection
Data link connected
GND
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4.3
UIM card Interface
The module supports 1.8V/2.85V UIM card. See the design in figure 4‐3. It’s recommended to add
ESD to protect the UIM card.
Table 4‐3 UIM card interface definitions
Classification
No.
Definitions
I/O
Descriptions
UIM
V_RUIM
RUIM card voltage
UIM_RST
RUIM card rest
UIM_CLK
RUIM card clock
UIM_DATA
I/O
RUIM card data
Remarks
The typical rate value of UIM card interface is about 3.25MHz, therefore the UIM card socket should
be put near the module’s interface to avoid serious waveform deformation caused by overlong wiring
(it’s advised that the wiring should not exceed 100mm), otherwise, it will affect the signal
communication.
The wiring of UIM_CLK and USIM_DATA should be enveloped by the ground wires. Add one 0.1uF or
0.22uF capacitance to V_RUIM, and add 33pF capacitance to UIM_CLK, UIM_DATA & UIM_RST to filter
the interference of antenna signals. Besides, the anti‐static performance of these four signals can be
realized through the TVS tube or ESD component. See the figure below for the reference design.
Figure 4‐4 UIM card circuit reference design
Note:
The PCB wiring of UIM card should be laid closely around the module as possible as you can, and the
ESD component should be put near the UIM card socket.
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4.4
Audio Interface (optional)
The module provides one PCM interface, which must connect one CODEC externally to input and
output audios. The module’s PCM interface provides PCM_CLK, PCM_SYNC, PCM_DIN, PCM_DOUT，and
it supports 2.048MHz PCM clock data rate and 8K frame data rate. PCM clock will stop the output
when it enters the dormant mode.
The module’s PCM interface must work under Master mode, and the clock and SYNC signal must
be sent by the module. The device connected with the interface can work under Slave mode only.
See the audio interface circuit in figure 4‐4.
Figure 4‐5 Audio interface circuit reference design principle diagram

Codec audio interface design on the headset
The two microphone interfaces MIC_N and MIC_P are both differential interfaces, which could
also be used for single‐end input. It’s recommended to use differential mode to reduce the noises.
Refer to the connection of EAR left/right channel in the figure.
See the time sequence of PCM interface in figure 4‐5.
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4.5
Work Status Indicators
The SIG_LED PIN output status is defined by the software. The SIG_LED PIN is MPP port, which
can drive 20mA current. See the reference design of indicators in figure 4‐5.
Table 4‐4 Description of work status indicators
Module status
Indicator status
Frequency
Power‐on status
Slow flash
1Hz
Network
status
Standard flash
3Hz
IDLE status
Slow flash
1Hz
Traffic status
Fast flash
5Hz
searching
Figure 4‐5 Indicator reference design principle diagram
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Mechanical Design
5.1
Appearance Diagram
See MW3736 module’s appearance in figure 5‐1.
Figure 5‐1 MW3736 module’s appearance diagram

Dimensions: 39.50mm×31.00mm×2.65mm

Weight: 10g
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5.2
Module’s Assembly Diagram
See the assembly diagram of the module in figure 5‐2.
Figure 5‐1 Module’s assembly diagram
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5.3
Module’s PCB Encapsulation Dimensions
See the module’s PCB encapsulation dimensions in figure 5‐3.
Figure 5‐2 PCB encapsulation diagram of relevant female socket (top view)
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Figure 5‐4 PCB encapsulation diagram of relevant female socket (bottom view)
Precautions while designing PCB:
1） Copper‐clad and wiring are forbidden on each layer of the PCB at the area below the RF test
points.
2） For the convenience of testing and maintenance, it might be necessary to drill holes on the
PCB to expose J‐TAG test points.
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