ZTE MW3736 WCDMA wireless data terminal User Manual user guide

ZTE Corporation WCDMA wireless data terminal user guide

User Manual

ZTEMW3736Hardware
Design
UserManual
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Version：V1.0
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CopyrightStatement
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ambiguousinthismanual,pleaseconsultZTECorporationoritsdistributoror
agentpromptly.
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Versionupdatedescription
Productversion Documentversion DocumentNo. Documentupdatedescriptions
 V1.0 Releasedforthefirsttime


Writer
Documentversion Date Writtenb
y
Requestedb
y
Approvedb
y
V1.0 2012‐08‐07LiuChangdi
YuXianwu 


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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.
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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. 
TargetReaders
Systemdesigningengineers
Mechanicalengineers
Hardwareengineers
Softwareengineers
Testingengineers
Descriptionofcontents:
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
1MODULE’S GENERAL DESCRIPTION .......................................................................... 1
1.1INTRODUCTION TO MODULE’S FUNCTIONS ..................................................... 1
1.2MODULE’S PRINCIPLE BLOCK DIAGRAM .......................................................... 2
1.3ABBREVIATIONS ................................................................................................... 3
2DESCRIPTION OF MODULE’S EXTERNAL INTERFACES ........................................... 6
2.1DEFINITIONS OF MODULE’S INTERFACES ........................................................ 6
2.2ANTENNA INTERFACE ......................................................................................... 8
2.3ANTENNA INTERFACE’S RF PERFORMANCE ................................................... 9
3MODULE’S ELECTRICAL CHARACTERISTICS ......................................................... 10
3.1DESCRIPTIONS OF INTERFACE LEVEL ........................................................... 10
3.2POWER ON/OFF TIME SEQUENCE ................................................................... 10
3.3RELIABILITY ........................................................................................................ 11
3.4ESD ...................................................................................................................... 11
4REFERENCE DESIGN OF INTERFACE CIRCUITS ..................................................... 13
4.1POWER AND RESET .......................................................................................... 13
4.2COM PORT .......................................................................................................... 14
4.3UIM CARD INTERFACE ....................................................................................... 17
4.4AUDIO INTERFACE (OPTIONAL) ....................................................................... 18
4.5WORK STATUS INDICATORS ............................................................................ 19
5MECHANICAL DESIGN ................................................................................................ 20
5.1APPEARANCE DIAGRAM ................................................................................... 20
5.2MODULE’S ASSEMBLY DIAGRAM ..................................................................... 21
5.3MODULE’S PCB ENCAPSULATION DIMENSIONS ............................................ 22
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1 Module’sGeneralDescription
 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provideshighly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 corresponds to the frequency band WCDMA850/1900,
GSM850/900/1800/1900; while MW3736_V1B corresponds to the frequency band
WCDMA850/900/2100,GSM850/900/1800/1900.
Thischaptermainlyintroducesthemodule’sbasicfunctionsandlogicblockdiagrams.
1.1 IntroductiontoModule’sFunctions
Table1‐1  Module’sfunctions
ParametersMW3736
Basicfeatures
FrequencybandWCDMA850/1900、
GSM850/900/1800/1900
Dimensions 39.50mm×31.00mm×2.65mm
Weight 10g
Worktemperature‐25℃~+65℃
Storagetemperature ‐30℃~+85℃
Performance
Workvoltage3.6V~4.2V
Standard:3.8V
Standardconsumption
Sleepcurrent(Min.):1mA
Idlecurrent（Ave.）:5mA@‐75dBm
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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ParametersMW3736
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
ProtocolInternalTCP/IPandUDP/IPprotocolstack
TCPserver
EmbeddedFTP
SMS
 SupportTEXT/PDUmode
 PTPMO/MT
SMSCellBroadcast
Audio(optional)
PCMaudio
Headset
 AudioencoderEVRC&13KQCELP
Volumecontrol
 SupportDTMF
ATcommandsettings 
CommonATcommands 
ZTEexclusiveATcommands 
1.2 Module’sPrincipleBlockDiagram
 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
A
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 
B
BER BitErrorRate
BTS BaseTransceiverStation
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C
CDMA CodeDivisionMultipleAccess
CDG CDMADevelopmentGroup
CS CodingScheme
CSD CircuitSwitchedData
CPU CentralProcessingUnit
D
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
E
EFR EnhancedFullRate
EGSM EnhancedGSM
EMC ElectromagneticCompatibility
EMI ElectroMagneticInterference
ESD ElectronicStaticDischarge
ETS EuropeanTelecommunicationStandard 
F
FDMA FrequencyDivisionMultipleAccess 
FR FullRate
G
GPRS GeneralPacketRadioService 
GSM GlobalStandardforMobileCommunications 
H
HR HalfRate 
I
IC IntegratedCircuit
IMEI InternationalMobileEquipmentIdentity 
ISO InternationalStandardsOrganization 
ITU InternationalTelecommunicationsUnion 
L
LCD LiquidCrystalDisplay
LED LightEmittingDiode
M
MCU MachineControlUnit
MMI ManMachineInterface   
MS MobileStation
P
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   
R
RAM RandomAccessMemory
RF RadioFrequency
ROM Read‐onlyMemory
RMS RootMeanSquare
RTC RealTimeClock 
S
SIM SubscriberIdentificationModule 
SMS ShortMessageService
SRAM StaticRandomAccessMemory
T
TA Terminaladapter
TDMA TimeDivisionMultipleAccess
TE TerminalEquipmentalsoreferreditasDTE 
U
UART Universalasynchronousreceiver‐transmitter 
UIM UserIdentifierManagement
USB UniversalSerialBus
V
VSWR VoltageStandingWave Rati o  
Z
ZTE ZTECorporation
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2 DescriptionofModule’sExternalInterfaces
 MW3736moduleadopts36pinstamp‐holeinterfacetoconnectexternally.
2.1 DefinitionsofModule’sInterfaces
Table2‐1Definitionsofmodule’sinterface
1VREG_USIM
UIM
MW3736
GND36
2USIM_RST
GND35
3USIM_CLK
LED
SIG_LED34
4USIM_DATA
PCM
(Opti
onal
)
PCM_DIN33
5GND
PCM_CLK32
6NC
USB
USB_DM31
7NCUSB_DP30
8NC
ON/OFF29
9NC
UART
PCM_SYNC(/DS
R
)28
10
NCPCM_DOUT(DCD)
27
11
NC/DTR26
12
GND
/RTS25
13
/PON_RESET
RI24
14
VBUS
POWER
TXD23
15
NCRXD22
16
VBAT/CTS21
17
V_MSME_1V8
GND20
18
VBAT
ANT
RF_ANT19
FunctionsPin
No.
Signalname I/O Basicfunctions Remarks
SIMcard
interface
1 VREG_USIM O 2.85V/1.8Vpowersupply
2 USIM_RST O USIM cardresetsignal
3 USIM_CL
K
O USIM cardclockcable
4 USIM_DATA I/O USIM carddatacable
11 MIC1_N I Differential audio input
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channel1‐
Reset 13 /PON_RESET I Resetsignal 1.8V, valid upon low
le ve l 
Power
14 VBUS I USB power +5V
16 VBAT I Module’smainpower 3.3V‐4.2V
17 V_MSME_1V8 O Digitalpower Voltageoutput, 1.8V
18 VBAT I Module’smainpower 3.3V‐4.2V
29 ON/OFF I Poweron/offcontrol 1.8V, valid upon low
le ve l 
UART
21 /CTS I Cleartosend 1.8V, valid upon low
le ve l 
22 RXD I Receivedata 1.8V
23 TXD O Transmitdata 1.8V
24 RI O Ringtone 1.8V
25 RTS O Requesttosend 1.8V, valid upon low
le ve l 
26 /DTR I Dataterminalready 1.8V, valid upon low
le ve l 
PCM
(optional)
27
PCM_DOUT
（DCD）O
PCM dataoutpu
t
1.8V，duplexwithDCD
28
PCM_SYNC
（/DSR）O
PCMframeSYNCclock 1.8V，duplexwith/DSR
32
PCM_CLK
（WAKEUP）O
PCM dataclock 1.8V,duplexingpin.See
Note(1)fordetailed
functions.
33 PCM_DIN I PCM datainpu
t
1.8V
USB
interface
30 USB_DP I/O USB data+
31 USB_DM I/O USB data‐
LED 34 SIG_LED O Module’s working status
indicator
Antenna 19 RF_ANT I/O Antennainterface
GND
5 
12
20
GND 
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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 AntennaInterface
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mustmore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usethe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 AntennaInterface’sRFPerformance
 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
Module’suplink
（MS‐>BTS）
Module’sdownlink
（BTS‐>MS）
Power
（dBm）
Antenna
interfaceRx.
sensitivity
WCDMA850 824MHz‐849MHz 869MHz‐894MHz 23(+1/‐2) <‐110dBm
WCDMA1900 1850MHz‐1910MHz 1930MHz‐1990MHz 23(+1/‐2) <‐110dBm
GSM850 824MHz‐849MHz 869MHz‐894MHz 32+‐0.5 <‐108dBm
GSM1900 1850MHz‐1910MHz 1930MHz‐1990MHz 29+‐0.5 <‐108dBm
GPRS850 824MHz‐849MHz 869MHz‐894MHz 30+‐0.5 <‐108dBm
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GPRS1900 1850MHz‐1910MHz 1930MHz‐1990MHz 28.5±0.5 <‐108dBm
EDGE850
EDGE1900
824MHz‐849MHz
1850MHz‐1910MHz
869MHz‐894MHz
1930MHz‐1990MHz
32+‐0.5
30+‐0.5
<‐108dBm
<‐108dBm
3 Module’sElectricalCharacteristics
This chapter mainly introduces the module’s electrical characteristics, including module’s
interfacelevel,powerconsumption,reliability,etc.
3.1 Descriptionsofinterfacelevel
Table3‐1  Descriptionoflevelofmodule’smainexternalinterfaces
External
interfaces
High/low
level Min. Typical Max. Remarks
UART 0 0 0.3*V_UART 
1 0.7*V_UART V_UART Internal voltage
conversion 
UIM 0 0 0.3*VREG_RUIM 
1 0.7*VREG_RUIM VREG_RUIM
 Amongthem,V_UARTis1.8V,andVREG_RUIMis1.8V/2.85V.
3.2 Poweron/offTimeSequence
 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. Max.  Remarks
To Normal work
temperature
‐25℃+65℃
Ta Limited work
temperature ‐30℃ +75℃
Basic
functions are
normal, but
the RF
performance
slightlydrops. 
Ts Module’s storage
temperature
‐40℃+85℃
3.4 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 Testitems Test
requirements Performance
Antenna
interface
Airdischarging ±8kV Nothingwrong
Contact
discharging ±６kVNothingwrong
UIM card
interface
Airdischarging ±8kV Nothingwrong
Contact
discharging ±６kVNothingwrong
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4 ReferenceDesignofInterfaceCircuits
 Thischapterdescribesthereferencedesignofinterfacecircuitsandprecautionsaccordingtothe
module’sfunctions. 
4.1 PowerandReset
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  lowpulsetothe
module’sON/OFFpintoturnonthemoduleagain.
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 COMPort
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controlto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 I Receivedata DTEtransmitsserialdata
25 UART_RTS O Readytosend DTEinformsDCEto
send 
23 UART_TX O TransmitdataDTEreceivesserialdata
26 UART_DTR I Dataterminalready DTEisready
21 UART_CTS I Cleartosend DCEhasswitchedtoRx.
mode
24 UART_RI O Ringtoneindication InformDTEupona
remotecall
28 UART_DSR O Datasetready DCEisready
27 UART_DCD O Carrierwavedetection Datalinkconnected
GND GND
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4.3 UIMcardInterface
 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 Remarks
UIM 1 V_RUIM O RUIMcardvoltage 
2 UIM_RST O RUIMcardrest
3 UIM_CLK O RUIMcardclock
4 UIM_DATA I/O RUIMcarddata
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wiringofUIM_CLKandUSIM_DATAshouldbe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 AudioInterface(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 WorkStatusIndicators
 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 searching
status Standardflash 3Hz
IDLEstatus Slowflash 1Hz
Trafficstatus Fastflash 5Hz
Figure4‐5Indicatorreferencedesignprinciplediagram 
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5 MechanicalDesign
5.1 AppearanceDiagram
 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’sAssemblyDiagram
 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’sPCBEncapsulationDimensions
 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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