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WA_DEV_W228_PTS_002

001

August 26, 2009

WISMO228 WIreless Standard MOdem

Product Technical Specification &

Customer Design Guidelines

WA_DEV_W228_PTS_002 Rev 001 Page 2 of 108

Product Technical Specification &

Customer Design Guidelines

Important Notice

Duetothenatureofwirelesscommunications,transmissionandreceptionofdatacanneverbe

guaranteed.Datamaybedelayed,corrupted(i.e.,haveerrors)orbetotallylost.Althoughsignificant

delaysorlossesofdataarerarewhenwirelessdevicessuchastheSierraWirelessmodemareusedin

anormalmannerwithawell‐constructednetwork,theSierraWirelessmodemshouldnotbeusedin

situationswherefailuretotransmitorreceivedatacouldresultindamageofanykindtotheuseror

anyotherparty,includingbutnotlimitedtopersonalinjury,death,orlossofproperty.Sierra

Wirelessacceptsnoresponsibilityfordamagesofanykindresultingfromdelaysorerrorsindata

transmittedorreceivedusingtheSierraWirelessmodem,orforfailureoftheSierraWirelessmodem

totransmitorreceivesuchdata.

Safety and Hazards

DonotoperatetheSierraWirelessmodeminareaswhereblastingisinprogress,whereexplosive

atmospheresmaybepresent,nearmedicalequipment,nearlifesupportequipment,orany

equipmentwhichmaybesusceptibletoanyformofradiointerference.Insuchareas,theSierra

WirelessmodemMUST BE POWERED OFF.TheSierraWirelessmodemcantransmitsignalsthat

couldinterferewiththisequipment.DonotoperatetheSierraWirelessmodeminanyaircraft,

whethertheaircraftisonthegroundorinflight.Inaircraft,theSierraWirelessmodemMUST BE

POWERED OFF.Whenoperating,theSierraWirelessmodemcantransmitsignalsthatcould

interferewithvariousonboardsystems.

Note: Some airlines may permit the use of cellular phones while the aircraft is on the ground and the door is

open. Sierra Wireless modems may be used at this time.

ThedriveroroperatorofanyvehicleshouldnotoperatetheSierraWirelessmodemwhileincontrol

ofavehicle.Doingsowilldetractfromthedriveroroperator’scontrolandoperationofthatvehicle.

Insomestatesandprovinces,operatingsuchcommunicationsdeviceswhileincontrolofavehicleis

anoffence.

WA_DEV_W228_PTS_002 Rev 001 Page 3 of 108

Product Technical Specification &

Customer Design Guidelines

Limitations of Liability

Thismanualisprovided“asis”.SierraWirelessmakesnowarrantiesofanykind,eitherexpressedor

implied,includinganyimpliedwarrantiesofmerchantability,fitnessforaparticularpurpose,or

noninfringement.Therecipientofthemanualshallendorseallrisksarisingfromitsuse.

Theinformationinthismanualissubjecttochangewithoutnoticeanddoesnotrepresenta

commitmentonthepartofSierraWireless.SIERRAWIRELESSANDITSAFFILIATES

SPECIFICALLYDISCLAIMLIABILITYFORANYANDALLDIRECT,INDIRECT,SPECIAL,

GENERAL,INCIDENTAL,CONSEQUENTIAL,PUNITIVEOREXEMPLARYDAMAGES

INCLUDING,BUTNOTLIMITEDTO,LOSSOFPROFITSORREVENUEORANTICIPATED

PROFITSORREVENUEARISINGOUTOFTHEUSEORINABILITYTOUSEANYSIERRA

WIRELESSPRODUCT,EVENIFSIERRAWIRELESSAND/ORITSAFFILIATESHASBEEN

ADVISEDOFTHEPOSSIBILITYOFSUCHDAMAGESORTHEYAREFORESEEABLEORFOR

CLAIMSBYANYTHIRDPARTY.

Notwithstandingtheforegoing,innoeventshallSierraWirelessand/oritsaffiliatesaggregate

liabilityarisingunderorinconnectionwiththeSierraWirelessproduct,regardlessofthenumberof

events,occurrences,orclaimsgivingrisetoliability,beinexcessofthepricepaidbythepurchaser

fortheSierraWirelessproduct.

©2009SierraWireless.Allrightsreserved.

Trademarks

AirCard

and“HeartoftheWirelessMachine

”arefiledorregisteredtrademarksofSierraWireless.

Watcher

isatrademarkofSierraWireless,registeredintheEuropeanCommunity.SierraWireless,

theSierraWirelesslogo,theredwavedesign,andthered-tippedantennaaretrademarksofSierra

Wireless.

,,

,inSIM

,“YOUMAKEIT,WEMAKEITWIRELESS

”,

WAVECOM

,WISMO

,WirelessMicroprocessor

,WirelessCPU

,OpenAT

arefiledorregistered

trademarksofWavecomS.A.inFranceand/orinothercountries.

Windows

isaregisteredtrademarkofMicrosoftCorporation.

QUALCOMM

isaregisteredtrademarkofQUALCOMMIncorporated.Usedunderlicense.

Othertrademarksarethepropertyoftherespectiveowners.

WA_DEV_W228_PTS_002 Rev 001 Page 4 of 108

Product Technical Specification &

Customer Design Guidelines

Contact Information

Sales Desk:

Phone: 1-604-232-1488

Hours: 8:00 AM to 5:00 PM Pacific Time

E-mail:

sales@sierrawireless.com

Post:

Sierra Wireless

13811 Wireless Way

Richmond, BC

Canada V6V 3A4

Fax: 1-604-231-1109

Web:

www.sierrawireless.com

Consultourwebsiteforup-to-dateproductdescriptions,documentation,applicationnotes,firmware

upgrades,troubleshootingtips,andpressreleases:

www.sierrawireless.com

Document Update History

Rev Date History of the evolution

001 August 26, 2009 Creation



WA_DEV_W228_PTS_002 Rev 001 Page 5 of 108

Product Technical Specification &

Customer Design Guidelines

Contents

CONTENTS ......................................................................................................................... 5

LISTOFFIGURES .............................................................................................................. 9

LISTOFTABLES .............................................................................................................. 11

1. REFERENCES .............................................................................................................. 13

ReferenceDocuments ............................................................................................................................ 13

WavecomReferenceDocumentation ............................................................................................. 13

ListofAbbreviations ............................................................................................................................. 13

2. GENERALDESCRIPTION ....................................................................................... 19

GeneralInformation .............................................................................................................................. 19

OverallDimensions ......................................................................................................................... 19

EnvironmentandMechanics .......................................................................................................... 19

RoHSDirectiveCompliant ....................................................................................................................... 19

CompleteShielding ................................................................................................................................... 19

GSM/GPRSFeatures ........................................................................................................................ 19

Interfaces ........................................................................................................................................... 20

Firmware ........................................................................................................................................... 20

ConnectionInterfaces ...................................................................................................................... 20

FunctionalDescription .......................................................................................................................... 21

RFFunctionalities ............ ......... ........ ......... ........... ......... ......... ........... ......... ........ ......... ........... ......... . 21

BasebandFunctionalities ................................................................................................................. 22

3. INTERFACES ............................................................................................................... 23

GeneralInterfaces .................................................................................................................................. 23

PowerSupply .......................................................................................................................................... 24

PowerSupplyDescription .............................................................................................................. 24

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 25

PinDescription ................................................................................................................................. 25

Application ....................................................................................................................................... 25

PowerConsumption .............................................................................................................................. 27

VariousOperatingModes ............................................................................................................... 27

PowerConsumptionValues ........................................................................................................... 28

ConsumptionWaveformSamples ....... .. .. .. ... .. .... .. ... .. .. .. .. ... .. .. .. .. ..... .. .. .. .. ... .. .. .. .. ... .. .... .. ... .. .. .. .. ... .. . 30

ConnectedModeCurrentWaveform ..................................................................................................... 31

TransferModeClass10CurrentWaveform .......................................................................................... 32

IdleModePage2CurrentWaveform ..................................................................................................... 32

IdleModePage9CurrentWaveform ..................................................................................................... 33

RecommendationsforLessConsumption ..................................................................................... 33

ElectricalInformationforDigitalI/O ................................................................................................. 34

WA_DEV_W228_PTS_002 Rev 001 Page 6 of 108

Product Technical Specification &

Customer Design Guidelines

SPIBusforDebugTraceONLY ......... ....... ...... ....... ....... ........ ....... ....... ...... ......... ....... ...... ....... ...... ........ 35

PinDescription ................................................................................................................................. 35

SPIWaveforms ................................................................................................................................. 35

MainSerialLink(UART) ................ .... ....... .... ..... .... .... ..... .... ....... .... ..... .... .... ..... ...... ..... .... .... ..... .... ..... ... 38

PinDescription ................................................................................................................................. 38

5‐wireSerialInterfaceHardwareDesign ............................................................................................... 39

4‐wireSerialInterfaceHardwareDesign ............................................................................................... 39

2‐wireSerialInterfaceHardwareDesign ............................................................................................... 39

Application ....................................................................................................................................... 40

V24/CMOSPossibleDesign ..................................................................................................................... 41

SIMInterface .......................................................................................................................................... 44

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 44

PinDescription ................................................................................................................................. 45

Application ....................................................................................................................................... 46

SIMSocketConnection .................................................................................................................... 46

GeneralPurposeInput/Output ............................................................................................................ 48

PinDescription ................................................................................................................................. 48

AnalogtoDigitalConverter ................................................................................................................. 49

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 49

PinDescription ................................................................................................................................. 49

AnalogAudioInterface ......................................................................................................................... 50

MicrophoneFeatures ....................................................................................................................... 50

ElectricalCharacteristics ........................................................................................................................... 51

SpeakerFeatures .............................................................................................................................. 52

ElectricalCharacteristics ........................................................................................................................... 52

PinDescription ................................................................................................................................. 53

Application ....................................................................................................................................... 53

Microphone ................................................................................................................................................ 53

SpeakerSPKPadSPKN ............................................................................................................................ 56

DesignRecommendations ........... .................. ................... .................. .................... ................. ........ 57

General ........................................................................................................................................................ 57

RecommendedMicrophoneCharacteristics .......................................................................................... 58

RecommendedSpeakerCharacteristics .................................................................................................. 58

RecommendedFilteringComponents .................................................................................................... 58

AudioTrackandPCBLayoutRecommendation .................................................................................. 59

Pulse‐WidthModulators(PWMs) ....................................................................................................... 62

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 62

PinDescription ................................................................................................................................. 62

Application ....................................................................................................................................... 63

BUZZEROutput ..................................................................................................................................... 64

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 64

PinDescription ................................................................................................................................. 65

Application ....................................................................................................................................... 65

LowFilterCalculations ............................................................................................................................. 66

RecommendedCharacteristics ................................................................................................................. 66

ON/~OFFSignal ..................................................................................................................................... 68

WA_DEV_W228_PTS_002 Rev 001 Page 7 of 108

Product Technical Specification &

Customer Design Guidelines

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 68

PinDescription ................................................................................................................................. 68

Application ....................................................................................................................................... 69

PowerON ................................................................................................................................................... 69

PowerOFF .................................................................................................................................................. 70

WISMO_READYIndication ................. .............. ............. ............... ............. ................ ............. ............ 72

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 72

PinDescription ................................................................................................................................. 72

VCC_2V8Output ................................................................................................................................... 73

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 73

PinDescription ................................................................................................................................. 73

Application ....................................................................................................................................... 73

BAT‐RTC(BackupBattery)................................................................................................................... 74

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 74

PinDescription ................................................................................................................................. 74

Application ....................................................................................................................................... 74

SuperCapacitor ......................................................................................................................................... 75

Non‐RechargeableBattery ........................................................................................................................ 75

RechargeableBatteryCell ......................................................................................................................... 76

TX_CTRLSignalforTXBurstIndication ........... ............... .................. ............... .................. .............. 77

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 77

PinDescription ................................................................................................................................. 78

Application ....................................................................................................................................... 78

Reset ......................................................................................................................................................... 79

ElectricalCharacteristics ............ ...... ....... ......... ...... ....... ....... ........ ....... ....... ...... ....... ........ ....... ....... ... 79

PinDescription ................................................................................................................................. 80

Application ....................................................................................................................................... 80

RFInterface ............................................................................................................................................. 82

RFConnection .................................................................................................................................. 82

RFPerformances .............................................................................................................................. 83

AntennaSpecifications .................................................................................................................... 83

4. CONSUMPTIONMEASUREMENTPROCEDURE ............................................. 85

HardwareConfiguration ....................................................................................................................... 85

Equipments ....................................................................................................................................... 85

WISMO218DevelopmentKit ......................................................................................................... 87

Socket‐UpBoard .................. ..... .... .... ....... .... ..... .... ..... .... .... ....... .... ..... .... .... ..... .... ....... .... ..... .... .... ..... . 88

SIMCards ......................................................................................................................................... 88

SoftwareConfiguration ......................................................................................................................... 88

WISMO228Configuration ........... ............... ................ ................. ................ ................. ................ ... 88

EquipmentConfiguration ............................................................................................................... 89

Template .................................................................................................................................................. 90

5. TECHNICALSPECIFICATIONS ............................................................................. 93

WA_DEV_W228_PTS_002 Rev 001 Page 8 of 108

Product Technical Specification &

Customer Design Guidelines

CastellationPins ........... ......... ......... ......... .......... ......... ......... ........... ......... ........ ......... ........... ......... .......... 93

PinConfiguration .......... ................. ................ ................. ................ ................. ............... ................. 93

PinDescription ................................................................................................................................. 94

RecommendedConnectionWhenNotUsed................................................................................. 95

PCBSpecificationsfortheApplicationBoard ......... ................ ................. ................ ................. ........ 96

EnvironmentalSpecifications .............................................................................................................. 97

FunctionStatusClassification ......................................................................................................... 97

ClassA ........................................................................................................................................................ 97

ClassB ......................................................................................................................................................... 97

MechanicalSpecifications .................................................................................................................... 99

PhysicalCharacteristics ................................................................................................................... 99

RecommendedPCBLandingPattern ................. .. ... .. .. .. ..... .. .. .. .. ... .. .. .. .. ... .. .... .. .. ... .. .. .. .. ... .. .. .. ..... .. . 99

WISMO228Dimensions .................................................................................................................. 99

6. RECOMMENDEDPERIPHERALDEVICES ....................................................... 100

GeneralPurposeConnector ................................................................................................................ 100

SIMCardReader .................................................................................................................................. 100

Microphone ........................................................................................................................................... 100

Speaker .................................................................................................................................................. 100

AntennaCable ...................................................................................................................................... 101

GSMAntenna ....................................................................................................................................... 101

7. NOISESANDDESIGN ........................................................................................... 102

EMCRecommendations ...................................................................................................................... 102

PowerSupply ........................................................................................................................................ 102

Overvoltage ........................................................................................................................................... 102

8. APPENDIX ................................................................................................................. 103

StandardsandRecommendations ..................................................................................................... 103

SafetyRecommendations(forInformationOnly) .......................................................................... 106

RFSafety ......................................................................................................................................... 106

GeneralSafety ....... ......... ........ ........... ......... ......... ......... ........... ......... ........ ......... ........... ......... ....... ... 107



WA_DEV_W228_PTS_002 Rev 001 Page 9 of 108

Product Technical Specification &

Customer Design Guidelines

List of Figures

Figure1. FunctionalArchitecture...............................................................................................................21

Figure2. PowerSupplyDuringBurstEmission......................................................................................24

Figure3. RejectFilterDiagram....................................................................................................................25

Figure4. SPITimingDiagram.....................................................................................................................35

Figure5. ExampleofanSPItoUART2InterfaceConversionImplementation.................................36

Figure6. ExampleofanRS‐232LevelShifterImplementationforUART2........................................37

Figure7. ExampleofRS‐232LevelShifterImplementationforUART................................................40

Figure8. ExampleofV24/CMOSSerialLinkImplementationfora2‐wireUART............................41

Figure9. ExampleofV24/CMOSSerialLinkImplementationfora4‐wireUART............................42

Figure10. ExampleofV24/CMOSSerialLinkImplementationfora5‐wireUART............................42

Figure11. ExampleofaFullModemV24/CMOSSerialLinkImplementationforafullUART.......43

Figure12. ExampleofaSIMSocketImplementation...............................................................................46

Figure13. DCEquivalentCircuitofMIC....................................................................................................50

Figure14. ACEquivalentCircuitofMIC....................................................................................................50

Figure15. EquivalentCircuitofSPK............................................................................................................52

Figure16. ExampleofaDifferentialMICConnectionwithanLCFilter..............................................54

Figure17. ExampleofaDifferentialMICConnectionwithoutanLCFilter........................................54

Figure18. ExampleofaSingle‐EndedMICConnectionwithanLCfilter............................................55

Figure19. ExampleofaSingle‐EndedMICConnectionwithoutanLCFilter.....................................56

Figure20. ExampleofaDifferentialSpeakerConnection........................................................................57

Figure21. ExampleofaSingle‐EndedSpeakerConnection....................................................................57

Figure22. CapacitorSolderedinParalleltotheMicrophone..................................................................58

Figure23. AudioTrackDesign.....................................................................................................................60

Figure24. DifferentialAudioConnection...................................................................................................60

Figure25. Single‐EndedAudioConnection...............................................................................................61

Figure26. RelativeTimingforthePWMOutput.......................................................................................62

Figure27. ExampleofanLEDDrivenbythePWM0orPWM1Output...............................................63

Figure28. BUZZEROutput...........................................................................................................................64

Figure29. ExampleofaBUZZERImplementation...................................................................................65

Figure30. ExampleofanLEDDrivenbytheBUZZEROutput..............................................................67

Figure31. ExampleoftheON/~OFFPinConnection...............................................................................69

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Customer Design Guidelines

Figure32. Power‐ONSequence....................................................................................................................69

Figure33. Power‐OFFSequence...................................................................................................................70

Figure34. RTCSuppliedbyaGoldCapacitor...........................................................................................75

Figure35. RTCSuppliedbyaNonRechargeableBattery........................................................................75

Figure36. RTCSuppliedbyaRechargeableBatteryCell.........................................................................76

Figure37. TX_CTRLStateDuringTXBurst...............................................................................................77

Figure38. ExampleofaTXStatusImplementation..................................................................................78

Figure39. ResetTiming..................................................................................................................................79

Figure40. Exampleof~RESETPinConnectionwithaPushButtonConfiguration...........................80

Figure41. Exampleof~RESETPinConnectionwithaTransistorConfiguration...............................80

Figure42. Exampleofa50ΩRFLine...........................................................................................................82

Figure43. TypicalHardwareConfiguration..............................................................................................86

Figure44. WISMO228PinConfiguration....................................................................................................93

Figure45. PCBStructureExamplefortheApplicationBoard.................................................................96

Figure46. WISMO228Dimensions...............................................................................................................99

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Customer Design Guidelines

List of Tables

Table1. FrequencyRangeforTxandRx..............................................................................................21

Table2. WISMO228Interfaces................................................................................................................23

Table3. InputPowerSupplyVoltage...................................................................................................25

Table4. PowerSupplyPinDescription................................................................................................25

Table5. WISMO228OperatingModes..................................................................................................27

Table6. WISMO228PowerConsumption............................................................................................29

Table7. Consumption/SoftwareDriverRecommendations.............................................................33

Table8. ElectricalCharacteristicsofDigitalI/Os................................................................................34

Table9. SPIBusPinDescription............................................................................................................35

Table10. MainSerialLinkPinDescription............................................................................................38

Table11. ElectricalCharacteristicsoftheSIMInterface......................................................................44

Table12. SIMInterfacePinDescription..................................................................................................45

Table13. SIMSocketPinDescription......................................................................................................46

Table14. GPIOPinDescriptions..............................................................................................................48

Table15. ElectricalCharacteristicsoftheADCInterface.....................................................................49

Table16. AnalogtoDigitalConverterPinDescription........................................................................49

Table17. ElectricalCharacteristicsofMIC.............................................................................................51

Table18. SpeakerDetails...........................................................................................................................52

Table19. ElectricalCharacteristicsofSPK..............................................................................................52

Table20. AnalogAudioInterfacePinDescription...............................................................................53

Table21. ElectricalCharacteristicsofthePWMInterface...................................................................62

Table22. PWMPinDescription................................................................................................................62

Table23. ElectricalCharacteristicsoftheBUZZERSignal..................................................................64

Table24. BUZZERPinDescription..........................................................................................................65

Table25. ElectricalCharacteristicsoftheON/~OFFSignal.................................................................68

Table26. ON/~OFFSignalPinDescription............................................................................................68

Table27. Power‐ONSequence.................................................................................................................69

Table28. ElectricalCharacteristicsoftheWISMO_READYIndication............................................72

Table29. WISMO_READYIndicationPinDescription........................................................................72

Table30. ElectricalCharacteristicsoftheVCC_2V8Signal.................................................................73

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Customer Design Guidelines

Table31. VCC_2V8PinDescription........................................................................................................73

Table32. ElectricalCharacteristicsoftheBAT‐RTCSignal.................................................................74

Table33. BAT‐RTCPinDescription........................................................................................................74

Table34. TX_CTRLStatus.........................................................................................................................77

Table35. ElectricalCharacteristicsoftheTX_CTRLSignal................................................................77

Table36. TX_CTRLSignalPinDescription............................................................................................78

Table37. ElectricalCharacteristicsoftheResetSignal.........................................................................79

Table38. ResetPinDescription................................................................................................................80

Table39. ResetCommands.......................................................................................................................81

Table40. AntennaSpecifications..............................................................................................................83

Table41. ListofRecommendedEquipments.........................................................................................87

Table42. OperatingModeInformation..................................................................................................89

Table43. WISMO228PowerConsumption............................................................................................90

Table44. WISMO228CastellationPinDescription...............................................................................94

Table45. RecommendedConnectionWhenNotUsed........................................................................95

Table46. OperatingClassTemperatureRange.....................................................................................97

Table47. EnvironmentalClasses..............................................................................................................98

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Product Technical Specification &

Customer Design Guidelines

1. References

Reference Documents

Severaldocumentsarereferencedthroughoutthisspecification.Formoredetails,pleaseconsultthe

listedreferencedocuments.TheWAVECOMdocumentsreferencedhereinareprovidedinthe

WAVECOMdocumentationpackage;however,thegeneralreferencedocumentswhicharenot

WAVECOMownedarenotprovidedinthedocumentationpackage.

Wavecom Reference Documentation

WISMO218HardwarePresentation

Reference:WA_DEV_W218_PTS_001

WISMO218ATCommandsManual

Reference:WA_DEV_W218_UGD_003

WISMO218DevelopmentKitUserGuide

Reference:WA_DEV_W218_UGD_004

CustomerProcessGuidelineforWISMOSeries

Reference:WM_DEV_W218_PTS_001

List of Abbreviations

Abbreviation Definition

AC Alternative Current

ADC Analog to Digital Converter

A/D Analog to Digital conversion

AF Audio-Frequency

AGC Automatic Gain Control

AT ATtention (prefix for modem commands)

AUX AUXiliary

CAN Controller Area Network

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Customer Design Guidelines

Abbreviation Definition

CB Cell Broadcast

CBS Cell Broadcast Service

CE -

CEP Circular Error Probable

CLK CLocK

CMOS Complementary Metal Oxide Semiconductor

CODEC COder DECoder

CPU Central Processing Unit

CS Coding Scheme

CSD Circuit Switched Data

CTS Clear To Send

DAC Digital to Analog Converter

DAI Digital Audio Interface

dB Decibel

DC Direct Current

DCD Data Carrier Detect

DCE Data Communication Equipment

DCS Digital Cellular System

DR Dynamic Range

DSR Data Set Ready

DTE Data Terminal Equipment

DTR Data Terminal Ready

EFR Enhanced Full Rate

E-GSM Extended GSM

EMC ElectroMagnetic Compatibility

EMI ElectroMagnetic Interference

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Product Technical Specification &

Customer Design Guidelines

Abbreviation Definition

EMS Enhanced Message Service

EN ENable

ESD ElectroStatic Discharges

ETSI European Telecommunications Standards Institute

FIFO First In First Out

FR Full Rate

FTA Full Type Approval

GND GrouND

GPI General Purpose Input

GPC General Purpose Connector

GPIO General Purpose Input Output

GPO General Purpose Output

GPRS General Packet Radio Service

GPS Global Positioning System

GPSI General Purpose Serial Interface

GSM Global System for Mobile communications

HR Half Rate

Hi Z High impedance (Z)

IC Integrated Circuit

IDE Integrated Development Environment

IF Intermediate Frequency

IMEI International Mobile Equipment Identification

I/O Input / Output

LCD Liquid Crystal Display

LED Light Emitting Diode

LNA Low Noise Amplifier

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Customer Design Guidelines

Abbreviation Definition

LSB Less Significant Bit

MAX MAXimum

MIC MICrophone

MIN MINimum

MMS Multimedia Message Service

MO Mobile Originated

MS Mobile Station

MT Mobile Terminated

na Not Applicable

NF Noise Factor

NMEA National Marine Electronics Association

NOM NOMinal

NTC Négative Temperature Coefficient

PA Power Amplifier

Pa Pascal (for speaker sound pressure measurements)

PBCCH Packet Broadcast Control CHannel

PC Personal Computer

PCB Printed Circuit Board

PCL Power Control Level

PCM Pulse Code Modulation

PCS

PDA Personal Digital Assistant

PFM Power Frequency Modulation

PLL Phase Lock Loop

PSM Phase Shift Modulation

PWM Pulse Width Modulation

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Customer Design Guidelines

Abbreviation Definition

RAM Random Access Memory

RF Radio Frequency

RFI Radio Frequency Interference

RHCP Right Hand Circular Polarization

RI Ring Indicator

RMS Root Mean Square

RST ReSeT

RTC Real Time Clock

RTCM Radio Technical Commission for Maritime services

RTS Request To Send

RX Receive

SCL Serial CLock

SDA Serial DAta

SIM Subscriber Identification Module

SMD Surface Mounted Device/Design

SMS Short Message Service

SPI Serial Peripheral Interface

SPL Sound Pressure Level

SPK SPeaKer

SW SoftWare

PSRAM Pseudo Static RAM

TBC To Be Confirmed

TDMA Time Division Multiple Access

TP Test Point

TU Typical Urban fading profile

TUHigh Typical Urban, High speed fading profile

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Customer Design Guidelines

Abbreviation Definition

TVS Transient Voltage Suppressor

TX Transmit

TYP TYPical

UART Universal Asynchronous Receiver-Transmitter

UBX µ-blox proprietary protocol (NE DOIT PAS APPARAITRE)

USB Universal Serial Bus

USSD Unstructured Supplementary Services Data

VSWR Voltage Standing Wave Ratio

WAP Wireless Application Protocol



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Product Technical Specification &

Customer Design Guidelines

2. General Description

General Information

TheWISMO228isaself‐containedGSM850/EGSM900/DCS1800/PCS1900quad‐bandmodulethat

wasspecificallydesignedforM2Msystemsdeployedallovertheworld.

Overall Dimensions

• Length:25.0mm

• Width:25.0mm

• Thickness:2.8mm(excludinglabelthickness)

• Weight:3.64g

Environment and Mechanics

RoHS Directive Compliant

TheWISMO228iscompliantwithRoHSDirective2002/95/ECwhichsetslimitsfortheuseofcertain

restrictedhazardoussubstances.Thisdirectivestatesthat“from1stJuly2006,newelectricaland

electronicequipmentputonthemarketdoesnotcontainlead,mercury,cadmium,hexavalent

chromium,polybrominatedbiphenyls(PBB)orpolybrominateddiphenylethers(PBDE)”.

Complete Shielding

AllelectronicpartsoftheWISMO228arenearly‐completelycoveredinaself‐containedshield.

GSM/GPRS Features

• 2WattsGSM850radiosectionrunningunder3.6Volts

• 2WattsEGSM900radiosectionrunningunder3.6Volts

• 1WattDCS1800radiosectionrunningunder3.6Volts

• 1WattPCS1900radiosectionrunningunder3.6Volts

• HardwareGPRSclass10capable

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Product Technical Specification &

Customer Design Guidelines

Interfaces

• VBATpowersupply

• Digitalsectionrunningunder2.8Volts

• 3V/1V8SIMinterface

• Powersupplies

• Seriallink(UART)

• Analogaudio

• ADC

• SerialbusSPIfordebugtrace

• PWM0,1andPWM2forbuzzeroutput

• GPIOs

• ON/~OFF

• TXburstindicator

• Modulereadyindicator

• Reset

Firmware

• DrivestheWISMO228viaanATcommandinterfaceoveraserialport

• FullGSM/GPRSOperatingSystemstack

• RealTimeClockwithcalendar

Connection Interfaces

TheWISMO228hasa46‐pincastellationformfactorwhichprovides:

• OneANTpinforRFin/out

• Otherpinsforbasebandsignals

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Product Technical Specification &

Customer Design Guidelines

Functional Description

TheglobalarchitectureoftheWISMO228isshowninthefigurebelow.



Figure 1. Functional Architecture

RF Functionalities

TheRadioFrequency(RF)rangecomplieswiththePhaseIIGSM850/EGSM900/DCS1800/PCS1900

recommendation.Thefrequencyrangeforthetransmitbandandreceivebandarelistedinthetable

below.

Table 1. Frequency Range for Tx and Rx

Transmit Band (Tx) Receive Band (Rx)

GSM 850 824 to 849 MHz 869 to 894 MHz

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Product Technical Specification &

Customer Design Guidelines

Transmit Band (Tx) Receive Band (Rx)

E-GSM 900 880 to 915 MHz 925 to 960 MHz

DCS 1800 1710 to 1785 MHz 1805 to 1880 MHz

PCS 1900 1850 to 1910 MHz 1930 to 1990 MHz

TheRFpartoftheWISMO228isbasedonaspecificdualbandchipwhichincludes:

• aDigitallow‐IFreceiver

• adual‐bandLNA(LowNoiseAmplifier)

• anOffsetPLL(PhaseLockedLoop)transmitter

• aFrequencysynthesizer

• aDigitallyControlledCrystalOscillator(DCXO)

• aTx/RxFEM(Front‐EndModule)forquad‐bandGSM/GPRS

Baseband Functionalities

TheBasebandiscomposedofanARM9,aDSPandananalogelement(withaudiosignals,I/Q

signalsandADC).

Thecorepowersupplyis1.2Vandthedigitalpowersupplyis2.8V.

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Customer Design Guidelines

3. Interfaces

General Interfaces

TheWISMO228hasa46‐pincastellationconnection,whichprovidesaccesstoallavailable

interfaces.ThefollowingtableenumeratestheavailableinterfacesontheWISMO228.

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Table 2. WISMO228 Interfaces

Available Interface Driven by

commands

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Product Technical Specification &

Customer Design Guidelines

Available Interface Driven by

commands

SPI Bus for Debug Trace ONLY

TheWISMO228providesoneSPIbusthroughthecastellationpin.

Caution: This interface is only used for monitoring trace for debug purposes.

Pin Description

ThefollowingtableprovidesthepindescriptionoftheSPIbus.

Table 3. SPI Bus Pin Description

Pin # Signal I/O I/O Type Reset State Description

13 SPI-IO I/O 2V8 Pull down SPI Serial input/output

14 SPI-O O 2V8 Pull down SPI Serial input

15 SPI-CLK O 2V8 Pull down SPI Serial Clock

17 ~SPI-CS O 2V8 Pull up SPI Enable

25 SPI-IRQ I 2V8 Pull down SPI Interrupt



AnSPI‐to‐UART2conversioncircuitisrequiredtoconverttheSPItracetoUART2.Also,theSPI‐IRQ

(pin25)isrequiredforinterrupt.Again,notethattheSPIinterfaceoftheWISMO228isnotopenfor

applicationuseotherthandebugtrace.

SPI Waveforms

Figure 2. SPI Timing Diagram



WA_DEV_W228_PTS_002 Rev 001 Page 26 of 108

Product Technical Specification &

Customer Design Guidelines

Available Interface Driven by

commands

SIM Interface Yes

Error! Reference source not found. No*

Error! Reference source not found. Yes

Serial Interface (SPI) No

Analog to Digital Converter No*

Pulse-Width Modulators (PWMs) Yes

ON/~OFF No

PWM2 for Buzzer Output Yes

Module Ready Indication No

VBAT_RTC (Backup Battery) No

TX Burst Indication Signal No

Error! Reference source not found. No

* These interfaces will have AT command support in future versions.

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Product Technical Specification &

Customer Design Guidelines

Power Supply

Power Supply Description

ThepowersupplyisoneofthekeyelementsinthedesignofaGSMterminal.Duetotheburst

emissioninGSM/GPRS,thepowersupplymustbeabletodeliverhighcurrentpeaksinashorttime.

Duringthesepeaks,theripple(U

ripple

)onthesupplyvoltagemustnotexceedacertainlimit.Referto

Table4InputPowerSupplyVoltagefortheinputpowersupplyvoltagevalues.

ListedbelowarethecorrespondingradioburstratesforthedifferentGPRSclassesin

communicationmode.

• AGSM/GPRSclass2terminalemits577μsradioburstsevery4.615ms.(SeeFigure5Power

SupplyDuringBurstEmission.)

• AGPRSclass10terminalemits1154μsradioburstsevery4.615ms.

VBATTprovidesforthefollowingfunctions:

• DirectlysuppliestheRFcomponentswith3.6V.Itisessentialtokeepaminimumvoltage

rippleatthisconnectioninordertoavoidanyphaseerror.

• Thepeakcurrent(TBDApeakinGSM/GPRSmode)flowswitharatioof:

 1/8ofthetime(around577μsevery4.615msforGSM/GPRSclass2)

and

 1/4ofthetime(around1154μsevery4.615msforGSM/GPRSclass10)

withtherisingtimeataround10μs.

• Internallyusedtoprovide,viaseveralregulators,thesupplyrequiredforthebaseband

signals.



Figure 5. Power Supply During Burst Emission

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Product Technical Specification &

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Electrical Characteristics

Table 4. Input Power Supply Voltage

Vmin Vnom Vmax ITYP Imax Ripple max (Uripp)

VBATT2 3.21 3.6 4.8 TBD TBD TBD

1: This value has to be guaranteed during the burst (with TBDA Peak in GSM or GPRS mode)

2: The maximum operating Voltage Stationary Wave Ratio (VSWR) is 1.5:1.

Note: When powering the WISMO228 with a battery, the total impedance (battery + protections + PCB)

should be less than 150m

Ω

Pin Description

Table 5. Power Supply Pin Description

Pin Numbers Signal

29,30 VBATT

20,22,23,26,28,31 GND

Application

TherejectfiltercanbeconnectedbetweenVBATTandthesupplysourcesifthesupplysourceis

noisy.

Caution: If the reject filter (C1+L1+C2) is an option, a capacitor (i.e. C2) is mandatory close to the VBATT.



Figure 6. Reject Filter Diagram



Thefollowingtableslisttherecommendedcomponentstouseinimplementingtherejectfilter.

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Customer Design Guidelines

C1,C2: 10μF+/‐20%

Component Manufacturer

GRM21BR60J106KE19L MURATA

CM21X5R106M06AT KYOCERA

JMK212BJ106MG-T TAYO YUDEN

C2012X5R0J106MT TDK



L1: 220nH+/‐5%

Component Manufacturer

0805CS-221XJLC COILCRAFT

0805G221J E STETCO

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Customer Design Guidelines

Power Consumption

ThepowerconsumptionlevelsoftheWISMO228varydependingontheoperatingmodeusedand

thefollowingsub‐sectionsdescribethepowerconsumptionvaluesoftheWISMO228whenrunning

invariousoperatingmodesandRFbands.

Various Operating Modes

RefertothefollowingtableforthelistofavailableoperatingmodesontheWISMO228.

Table 6. WISMO228 Operating Modes

Mode Description

OFF Mode When VBATT power is supplied to the WISMO228 but it has not yet been powered

ON.

Alarm Mode

When alarm clock is set for the WISMO228 with ALL of the following conditions:

• before time is up

• with AT + CPOF having been entered from a computer that is connected to the

WISMO228

• with the ON/~OFF signal being left open (remains at HIGH level)

Idle Mode When the WISMO228 has a location update with a live network but with no

GSM/GPRS connection, while the UART interface is in sleep mode.

Connected Mode The WISMO228 has GSM voice codec connection with a live network.

Transfer Mode The WISMO228 has GPRS data transfer connection with a live network.

NotethattherearetwodifferentmethodsofenteringsleepmodethroughtheATcommand,

AT+PSSLEEP.

• AT+PSSLEEP=0

 TheentryofsleepmodeiscontrolledbytheleveloftheDTRsignalandthe

firmware.

 TheWISMO228willneverentersleepmodewhentheDTR(viewedfromthe

moduleside)isofLOWvoltagelevel.Ontheotherhand,theWISMO228willenter

sleepmodewhentheDTR(viewedfromthemoduleside)isofHIGHvoltagelevel.

 TowaketheWISMO228up,itisnecessarytotoggletheDTR(viewedfrommodule

side)fromHIGHtoLOWvoltagelevel.

 Thismethodshouldbeusediftheapplicationneedstoforbidtheentryofsleep

mode.

• AT+PSSLEEP=1

 Theentryofsleepmodeiscontrolledjustbythefirmware.

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 WhentheWISMO228hashadnoactivitiesforacertainperiodoftime,itwillenter

sleepmodeautomatically,regardlessoftheDTRlevel.

 AnyASCIIcharacterontheUARTcanwaketheWISMO228up.

RefertotheWISMO218ATCommandsManualformoreinformationabouttheAT+PSSLEEP

command.

Power Consumption Values

ThreeVBATTvalueswereusedtomeasurethepowerconsumptionoftheWISMO228:VBATTmin

(3.2V),VBATTmax(4.8V)andVBATTtyp(3.6V).Boththeaveragecurrentandthemaximumcurrent

peakswerealsomeasuredforallthreeVBATTvalues.

ThefollowingconsumptionvalueswereobtainedbyperformingmeasurementsonWISMO228

samplesatatemperatureof25°Cwiththeassumptionofa50ΩRFoutput.

Note: Power consumption performance is software related. The results listed below are based on the

software version TBD.

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Table 7. WISMO228 Power Consumption

WISMO228 Power Consumption

Operating Mode Parameters IMIN

average

VBATT=4.8V

INOM

average

VBATT=3.6V

IMAX

average

VBATT=3.2

IMAX peak Unit

Off Mode* TBD TBD TBD TBD µA

Alarm Mode TBD TBD TBD TBD µA

Idle Mode** Paging 2 (Rx burst

occurrence ~0.5s) TBD TBD TBD TBD mA

Paging 9 (Rx burst

occurrence ~2s) TBD TBD TBD TBD mA

Connected Mode

850 MHz

PCL5 (TX

power 33dBm) TBD TBD TBD TBD mA

PCL19 (TX

power 5dBm) TBD TBD TBD TBD mA

900 MHz

PCL5 (TX

power 33dBm) TBD TBD TBD TBD mA

PCL19 (TX

power 5dBm) TBD TBD TBD TBD mA

1800 MHz

PCL0 (TX

power 30dBm) TBD TBD TBD TBD mA

PCL15 (TX

power 0dBm) TBD TBD TBD TBD mA

1900 MHz

PCL0 (TX

power 30dBm) TBD TBD TBD TBD mA

PCL15 (TX

power 0dBm) TBD TBD TBD TBD

mA

GPRS Transfer

Mode class

8 (4Rx/1Tx)

850 MHz

Gam.3 (TX

power 33dBm) TBD TBD TBD TBD mA

Gam.17 (TX

power 5dBm) TBD TBD TBD TBD

mA

900 MHz

Gam.3 (TX

power 33dBm) TBD TBD TBD TBD mA

Gam.17 (TX

power 5dBm) TBD TBD TBD TBD

mA

1800 MHz Gam.3 (TX

power 30dBm) TBD TBD TBD TBD mA

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Customer Design Guidelines

Gam.18 (TX

power 0dBm) TBD TBD TBD TBD

mA

1900 MHz

Gam.3 (TX

power 30dBm) TBD TBD TBD TBD mA

Gam.18 (TX

power 0dBm) TBD TBD TBD TBD

mA

Transfer

Mode class

10 (3Rx/2Tx)

850 MHz

Gam.3 (TX

power 33dBm) TBD TBD TBD TBD mA

Gam.17 (TX

power 5dBm) TBD TBD TBD TBD

mA

900 MHz

Gam.3 (TX

power 33dBm) TBD TBD TBD TBD mA

Gam.17 (TX

power 5dBm) TBD TBD TBD TBD

mA

1800 MHz

Gam.3 (TX

power 30dBm) TBD TBD TBD TBD mA

Gam.18 (TX

power 0dBm) TBD TBD TBD TBD

mA

1900 MHz

Gam.3 (TX

power 30dBm) TBD TBD TBD TBD mA

Gam.18 (TX

power 0dBm) TBD TBD TBD TBD

mA

* Current consumption in OFF mode is measured with BAT-RTC being left open.

** Idle Mode consumption depends on the SIM card used. Some SIM cards respond faster than others, in which

case the longer the response time is, the higher the consumption is.

Note: TX means that the current peak is the RF transmission burst (Tx burst).

RX means that the current peak is the RF reception burst (Rx burst), in GSM mode only (worst case).

4. Refer to section 1

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ConsumptionMeasurementProcedureformoreinformationregardingconsumptionmeasurement

procedures.

Consumption Waveform Samples

TheconsumptionwaveformspresentedbelowhaveatypicalVBATTvoltageof3.6Vandareforan

EGSM900networkconfiguration.

Foursignificantoperatingmodeconsumptionwaveformsareshowninthefollowingsubsections,

namely:

• ConnectedMode(PCL5:Txpower33dBm)

• Transfermode(GPRSclass10,gam.3:Txpower33dBm)

• Idlemode(Paging2)

• Idlemode(Paging9)

Note: The following diagrams only show the waveform of the current, and not the exact values.

Connected Mode Current Waveform



TXPEAK

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Transfer Mode Class 10 Current Waveform



Idle Mode Page 2 Current Waveform



RXPEAK

TXPEAK

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Idle Mode Page 9 Current Waveform



Recommendations for Less Consumption

Forbetterpowerconsumption,inparticularforthequiescentcurrent,itisrecommendedtodrive

theGPIOsasshowninthetablebelow.

Table 8. Consumption/Software Driver Recommendations

Pin # Signal I/O I/O Type Reset State Recommended SW Driver (Logic

Level Output State)

16 GPIO3 I/O 2V8 Pull up 1

19 GPIO5 I/O 2V8 Z** Input: 0

Output: 1

24 GPIO1 I/O 2V8 Pull up 1

** When GPIO5 is used as a general purpose output, it is necessary to have an external pull up resistor

connecting to a 2.8V source. The resistance value depends on the current drain required by the application side.

Note: GPIO2 is dedicated for WISMO_READY and is not open as a GPIO for customer use.

GPIO4 is dedicated for TX burst indication and is not open as GPIO for customer use.



RXPEA

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Electrical Information for Digital I/O

ThefollowingtabledescribestheelectricalcharacteristicsofthedigitalI/Os(interfacessuchas

GPIO,SPI,etc.)availableontheWISMO228.

Table 9. Electrical Characteristics of Digital I/Os

2.8Volt Type (2V8)

Parameter Conditions I/O Type Minimum Typical Maximum

Internal 2.8V power supply VCC_2V8 2.7V 2.8V 2.95V

Input/Output

VIL CMOS -0.4V* - 0.4V

VIH CMOS 2.4V - VCC_2V8 +

0.4V

VOL CMOS - - 0.1V

VOH

CMOS 2.7V - -

IOH = 4mA CMOS 2.4V - -

* Absolute maximum ratings

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Customer Design Guidelines

SPI Bus for Debug Trace ONLY

TheWISMO228providesoneSPIbusthroughthecastellationpin.

Caution: This interface is only used for monitoring trace for debug purposes.

Pin Description

ThefollowingtableprovidesthepindescriptionoftheSPIbus.

Table 10. SPI Bus Pin Description

Pin # Signal I/O I/O Type Reset State Description

13 SPI-IO I/O 2V8 Pull down SPI Serial input/output

14 SPI-O O 2V8 Pull down SPI Serial input

15 SPI-CLK O 2V8 Pull down SPI Serial Clock

17 ~SPI-CS O 2V8 Pull up SPI Enable

25 SPI-IRQ I 2V8 Pull down SPI Interrupt



AnSPI‐to‐UART2conversioncircuitisrequiredtoconverttheSPItracetoUART2.Also,theSPI‐

IRQ(pin25)isrequiredforinterrupt.Again,notethattheSPIinterfaceoftheWISMO228isnot

openforapplicationuseotherthandebugtrace.

SPI Waveforms



Figure 7. SPI Timing Diagram



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

Figure 8. Example of an SPI to UART2 Interface Conversion Implementation



ThefollowingtableliststherecommendedcomponentstouseinimplementingtheSPItoUART2

interface.

Component Description/Details Manufacturer

U103 SC16IS750IPW NXP Semiconductors

X101 3, 6864MHz 86SMX surface mount crystal (971-

3131) Farnell

R104, R105 10KΩ

R106 1KΩ

C105 22pF

C106 33pF

C107 100nF

AfterconvertingtheSPIsignaltoaUARTsignal,aUARTtransceivercircuitryisneededto

communicatethisUARTsignaltotheDTE.

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

Figure 9. Example of an RS-232 Level Shifter Implementation for UART2



ThefollowingtableliststherecommendedcomponentstouseinimplementingaUARTtransceiver

circuitry.

Component Description/Details Manufacturer

U200 LTC2804IGN-1 LINEAR TECHNOLOGY

L200 LQH2M CN100K02L MURATA

J200 096615276119 SUBD9F HARTING

R202 NC

R204 100KΩ

C200 1µF

C201 220nF

C207 1µF

C208 1µF

Note: It is recommended to make SPI signals accessible for diagnostics by reserving some test points, for

example.



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Main Serial Link (UART)

Aflexible8‐wireserialinterfaceisavailableontheWISMO228thatcomplieswiththeV24protocol

signaling,butnotwiththeV28(electricalinterface)protocol,duetoits2.8Vinterface.

ThesupportedbaudratesoftheUARTare1200,2400,4800,9600,19200,38400,57600and115200

Kbits,withautobauding;andthesignalsusedbytheUARTare:

• TXdata(CT103/TXD)

• RXdata(CT104/RXD)

• RequestToSend(~CT105/RTS)

• ClearToSend(~CT106/CTS)

• DataTerminalReady(~CT108/DTR)

• DataSetReady(~CT107/DSR)

• DataCarrierDetect(~CT109/DCD)

• RingIndicator(~CT125/RI).

Pin Description

ThefollowingtableprovidesthepindescriptionsoftheUARTinterface.

Table 11. Main Serial Link Pin Description

* According to PC (DTE) view

Note: The rising time and falling time of the reception signals (mainly CT103/TXD) have to be less than

300ns.

The WISMO228 is designed to operate using all the serial interface signals and it is recommended to

Pin # Signal* I/O I/O Type Reset State Description

38 CT103/TXD I 2V8 1 Transmit serial data

39 ~CT105/RTS I 2V8 1 Request To Send

40 CT104/RXD O 2V8 0 Receive serial data

41 ~CT106/CTS O 2V8 0 Clear To Send

42 ~CT107/DSR O 2V8 1 Data Set Ready

43 ~CT109/DCD O 2V8 1 Data Carrier Detect

44 ~CT108/DTR I 2V8 1 Data Terminal Ready

45 ~CT125/RI O 2V8 1 Ring Indicator

GND GND Ground

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Product Technical Specification &

Customer Design Guidelines

use ~CT105/RTS and ~CT106/CTS for hardware flow control in order to avoid data corruption during

transmissions.

5-wire Serial Interface Hardware Design

Thesignalsusedinthisinterfacehardwaredesignareasfollows:

• CT103/TXD

• CT104/RXD

• ~CT105/RTS

• ~CT106/CTS

• ‐CT108/DTR



Thesignal~CT108/DTRmustbemanagedfollowingtheV24protocolsignalingifidlemodeistobe

used.

Foradetailedconfiguration,refertoFigure13ExampleofV24/CMOSSerialLinkImplementation

fora5‐wireUART.

Note: All signals are specified according to PC (DTE) view.

4-wire Serial Interface Hardware Design

Thesignalsusedinthisinterfacehardwaredesignareasfollows:

• CT103/TXD

• CT104/RXD

• ~CT105/RTS

• ~CT106/CTS



Thesignal~CT108/DTRcanbeloopedbackto~CT107/DSRfromboththeWISMO228sideandfrom

theDTEside.

Foradetailedconfiguration,refertoFigure12ExampleofV24/CMOSSerialLinkImplementation

fora4‐wireUART.

Note: All signals are specified according to PC (DTE) view.

2-wire Serial Interface Hardware Design

Note: Although this case is possible for a connected external chip, it is not recommended.

All signals are specified according to PC (DTE) view.

Thesignalsusedinthisinterfacehardwaredesignareasfollows:

• CT103/TXD

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• CT104/RXD

Signals~CT105/RTSand~CT106/CTSarenotusedinthisconfiguration.ConfiguretheATcommand

AT+IFC=0,0todisabletheflowcontrolfunctionontheWISMO228.RefertotheWISMO218AT

CommandsManualformoreinformationaboutconfiguringATcommands.

Also,

• Thesignal~CT108/DTRcanbeloopedbackto~CT107/DSRfromboththeWISMO228side

andfromtheDTEside.

• Thesignal~CT105/RTScanbeloopedbackto~CT106/CTSfromboththeWISMO228side

andfromtheDTEside.

• Theflowcontrolmechanismhastobemanagedfromthecustomerside.

Foradetailedconfiguration,refertoFigure11ExampleofV24/CMOSSerialLinkImplementation

fora2‐wireUART.

The loop back connection of ~CT108/DTR to

~CT107/DSR is not allowed when

AT+PSSLEEP=0 is used, for which sleep mode

entry is ~CT108/DTR level dependent. For more

details, refer to the discussion about AT + PSSLEEP

= 0 in section 0

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Power Consumption.

In order to go to sleep mode properly under this

instead. For more details, refer to the discussion

about AT + PSSLEEP = 1 in section 0

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Note: Power Consumption.

Application

ThelevelshiftermustbeaV28electricalsignalcompliantwith2.8V.



Figure 10. Example of RS-232 Level Shifter Implementation for UART

Note: The U1 chip also protects the WISMO228 against ESD (air discharge) at 15KV.

Thefollowingtableliststherecommendedcomponentstouseinimplementingalevelshifter

UART.

Component Description/Details Manufacturer

R1, R2 15KΩ

C1, C2, C3, C4, C5 1µF

C6 100nF

C7 6.8uF TANTAL 10V CP32136 AVX

U1 ADM3307EACP ANALOG DEVICES

J1 SUB-D9 female

R1andR2arenecessaryonlyduringtheResetstatetoforcethe~CT125/RIand~CT109/DCDsignals

toHIGHlevel.

TheADM3307EACPcanbepoweredbytheVCC_2V8(pin46)oftheWISMO228orbyanexternal

regulatorat2.8V.

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Product Technical Specification &

Customer Design Guidelines

ItisnotnecessarytouselevelshifterswhentheUARTinterfaceisdirectlyconnectedtoahost

processor.Refertothefollowingsectionsforstepsonhowtoconnecttheinterfaceusingother

designimplementations.

V24/CMOS Possible Design



Figure 11. Example of V24/CMOS Serial Link Implementation for a 2-wire UART



Figure 12. Example of V24/CMOS Serial Link Implementation for a 4-wire UART

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Customer Design Guidelines



Figure 13. Example of V24/CMOS Serial Link Implementation for a 5-wire UART

ThedesignsshowninFigure11,Figure12andFigure13arebasicdesigns.BoththeDCDandtheRI

canbeleftopenwhennotused.

However,amoreflexibledesigntoaccessthisseriallinkwithallmodemsignalsisshownbelow.



Figure 14. Example of a Full Modem V24/CMOS Serial Link Implementation for a full UART

Aninternal10KΩpull‐upresistorisconnectedonbothRIandDCDtosetthesignalstoHIGHlevel

duringtheResetstate.

TheUARTinterfaceisa2.8Vtype,butitis3Vtolerant.

Note: The WISMO228 UART is designed to operate using all the serial interface signals. In particular, it is

recommended to use ~CT105/RTS and ~CT106/CTS for hardware flow control in order to avoid data

corruption during transmission.

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Product Technical Specification &

Customer Design Guidelines

SIM Interface

TheSubscriberIdentificationModulecanbedirectlyconnectedtotheWISMO228throughthis

dedicatedinterface.

Thisinterfacecontrolsboth1.8Vand3VSIMcardsandisfullycompliantwithGSM11.11

recommendationsconcerningSIMfunctions.

TheSIMusesfoursignals,namely:

• SIM‐VCC:SIMpowersupply

• ~SIM‐RST:reset

• SIM‐CLK:clock

• SIM‐IO:I/Oport



ItisrecommendedtoaddTransientVoltageSuppressor(TVS)diodesonthesignalsconnectedto

theSIMsocketinordertopreventanyElectrostaticDischarge.TVSdiodeswithlowcapacitance

(lessthan10pF)havetobeconnectedontheSIM‐CLKandSIM‐IOsignalstoavoidanydisturbance

fromtherisingandfallingedgeofthesignals.TVSdiodesaremandatoryfortheFullType

ApprovalandtheymustbeplacedasclosetotheSIMsocketaspossible.

TherecommendedlowcapacitancediodearraytouseistheDALC208SC6fromSTMicroelectronics.

Electrical Characteristics

ThefollowingtabledescribestheelectricalcharacteristicsoftheSIMinterface.

Table 12. Electrical Characteristics of the SIM Interface

Parameters Conditions Minimum Typical Maximum Unit

SIM-IO VIH IIH = ± 20µA 0.7xVSIM - - V

SIM-IO VIL IIL = 1mA - - 0.4 V

~SIM-RST, SIM-CLK

VOH Source current = 20µA 0.9xVSIM - - V

SIM-IO VOH Source current = 20µA 0.8xVSIM - - V

~SIM-RST, SIM-IO, SIM-

CLK

VOL

Sink current =

-200µA - - 0.4 V

SIM-VCC Output Voltage SIM-VCC = 2.9V 2.75 2.9 3.0 V

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Product Technical Specification &

Customer Design Guidelines

Parameters Conditions Minimum Typical Maximum Unit

SIM-VCC = 1.8V 1.65 1.8 1.95 V

SIM-VCC current

full-power mode - - 20 mA

Sleep mode with 32kHz

system clock enabled. - - 3 mA

SIM-CLK Rise/Fall Time Loaded with 30pF and ESD

protection diode - 25 50 ns

~SIM-RST, Rise/Fall

Time Loaded with 30pF and ESD

protection diode - 45 - ns

SIM-IO Rise/Fall Time

Loaded with 30pF and ESD

protection diode

- 0.2 1 µs

SIM-CLK Frequency Loaded with 30pF - - 3.25 MHz

Pin Description

ThefollowingtableprovidesthepindescriptionoftheSIMinterface.

Table 13. SIM Interface Pin Description

Pin # Signal I/O I/O Type Reset State Description Multiplexed

8 SIM-VCC O 2V9 / 1V8 SIM Power Supply No

9 SIM-CLK O 2V9 / 1V8 0 SIM Clock No

10 SIM-IO I/O 2V9 / 1V8 Pull up SIM Data No

11 ~SIM-RST O 2V9 / 1V8 0 SIM Reset No

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Customer Design Guidelines

Application



Figure 15. Example of a SIM Socket Implementation

ThefollowingtableliststherecommendedcomponentstouseinimplementingtheSIMsocket.

Component Description/Details Manufacturer

C400 100nF

D400 ESDA6V1SC6 ST

D401 DALC208SC6 SGS-THOMSON

J400

ITT CANNON CCM03 series

(Refer to the SIM Card Reader sub-section of

section 1 Error! Not a valid result for table. for

more information)

CANNON

SIM Socket Connection

ThefollowingtableprovidesthepindescriptionoftheSIMsocket.

Table 14. SIM Socket Pin Description

Pin # Signal Description

1 VCC SIM-VCC

2 RST ~SIM-RST

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Customer Design Guidelines

Pin # Signal Description

3 CLK SIM-CLK

4 CC4 Not connected

5 GND GROUND

6 VPP Not connected

7 I/O SIM-IO

8 CC8 Not connected

Note: CC4 and CC8 are not connected as the WISMO228 does not support the SIM detect feature.

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Customer Design Guidelines

General Purpose Input/Output

TheWISMO228providesuptothreeGeneralPurposeI/Os.Theyareusedtocontrolanyexternal

devicesuchasanLCDoraKeyboardbacklight.

TheseGPIOsofferthepossibilitytoreadthepinstatewhatevertheirdirectionmaybe.

Pin Description

ThefollowingtableprovidesthepindescriptionoftheGPIOs.

Table 15. GPIO Pin Descriptions

Pin # Signal I/O I/O Type Reset State

16 GPIO3 I/O 2V8 Pull up

19 GPIO5 I/O 2V8 Pull down

24 GPIO1 I/O 2V8 Pull up

WhenGPIO5isusedasageneralpurposeoutput,itisnecessarytohaveanexternalpullupresistor

connectedtoa2.8Vsource.Theresistancevaluewilldependonthecurrentdrainrequiredbythe

application.

Note: GPIO2 is dedicated for WISMO_READY and is not open as GPIO for customer use.

GPIO4 is dedicated for TX burst indication and is not open as GPIO for customer use.

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Customer Design Guidelines

Analog to Digital Converter

OneAnalogtoDigitalConverterinput,AUX‐ADC0,isprovidedbytheWISMO228forcustomer

applications.Itisa10‐bitresolutionconverter,rangingfromeither0to1Vor0to3V,dependingon

thegeneralpurposeinputmode.

Electrical Characteristics

ThefollowingtabledescribestheelectricalcharacteristicsoftheADCinterface.

Table 16. Electrical Characteristics of the ADC Interface

Parameters Minimum Typical Maximum Unit

Resolution - 10 - bits

Sampling frequency - - 200 kHz

Input signal range

1 general purpose input 0 - 1 V

1 general purpose input in div-by-3

mode 0 - 3 V

Integral non-linearity (INL) -2.5 - +2.5 bit

Differential non-linearity (DNL) -1 - +3 bit

Input impedance

input resistance 120 - - KΩ

input capacitance - - 10 pF

Pin Description

ThefollowingtableprovidesthepindescriptionoftheAnalogtoDigitalConverterinterface.

Table 17. Analog to Digital Converter Pin Description

Pin # Signal I/O I/O Type Description

5 AUX-ADC0 I Analog A/D converter

Caution: The AUX-ADC0 pin is ESD sensitive and it is a must to add ESD protection to this pin once it is

externally accessible. The recommended ESD protection to use is the AVL5M02200 from Amotech.

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Customer Design Guidelines

Analog Audio Interface

TheWISMO228supportsonemicrophoneinputandonespeakeroutput.Italsoincludesanecho

cancellationfeaturewhichallowshandsfreefunction.

Insomecases,ESDprotectionmustbeaddedontheaudiointerfacelines.

Microphone Features

Themicrophone,MIC,canhaveeitherasingle‐endedoradifferentialconnection.However,itis

stronglyrecommendedtouseadifferentialconnectioninsteadofasingle‐endedconnectioninorder

torejectcommonmodenoiseandTDMAnoise.

Whenusingasingle‐endedconnection,besuretohaveaverygoodgroundplane,verygood

filteringaswellasshieldinginordertoavoidanydisturbanceontheaudiopath.

ThegainofMICinputsisinternallyadjustedandcanbetunedusingATcommands.

TheMICinterfacealreadyincludessuitablebiasingforanelectretmicrophone.Theelectret

microphonecanbeconnecteddirectlyontheinputsforeasyconnection.

ACcouplingisalsoalreadyembeddedintheWISMO228.



Figure 16. DC Equivalent Circuit of MIC



Figure 17. AC Equivalent Circuit of MIC

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Electrical Characteristics

Thefollowingtabledescribestheelectricalcharacteristicsoftheaudiointerface,MIC.

Table 18. Electrical Characteristics of MIC

Parameters Minimum Typical Maximum Unit

Internal biasing

DC Characteristics

MICP - 2.4 - V

MICN without 2.2KΩ to GND - 2.4 - V

MICN with 2.2KΩ to GND - 1.2 - V

Output current mA

R2 - 2.2 -

KΩ

AC Characteristics

200 Hz<F<4 kHz

Z2 MICP (MICN=Open)

2.2

KΩ

Z2 MICN (MICP=Open)

Z2 MICP (MICN=GND)

2.2

Z2 MICN (MICP=GND)

Impedance between MICP

and MICN without 2.2KΩ to

GND 4.5

Impedance between MICP

and MICN with 2.2KΩ to

GND 3.2

Maximum working voltage

( MICP-MICN)

(THD 10%)

AT+VGT*=1

- -

210

mVp

Maximum rating voltage

(MICP or MICN)

-0.5

4.4 V

* The input voltage depends on the input micro gain set by the AT command. Refer to the WISMO218 AT

Commands Manual for more information about AT commands.

Note: Because both MICP and MICN are internally biased, it is necessary to use a coupling capacitor to

connect an audio signal provided by an active generator. Only a passive microphone can be directly

connected to the MICP input.

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Customer Design Guidelines

Speaker Features

Thespeaker,SPK,caneitherhaveasingle‐endedoradifferentialconnection.However,itisstrongly

recommendedtouseadifferentialconnectioninsteadofasingle‐endedconnectioninordertoreject

commonmodenoiseandTDMAnoise.Moreover,inasingle‐endedconnection,half(½)ofthe

powerislost.



Figure 18. Equivalent Circuit of SPK

Table 19. Speaker Details

Parameters Typical Unit Connection

Z (SPKP, SPKN) 16 or 32 Ω Differential

Z (SPKP, SPKN) 8 Ω Single-ended



Ifasingle‐endedconnectionisused,onlySPKPhastobeconnected.Theresultisamaximaloutput

powerdividedby2.Also,whenusingasingle‐endedconnection,besuretohaveaverygood

groundplane,verygoodfilteringaswellasshieldinginordertoavoidanydisturbanceontheaudio

path.

Electrical Characteristics

Thefollowingtabledescribestheelectricalcharacteristicsofthemicrophoneinterface,MIC.Note

thatthemaximumvaluesspecifiedinthefollowingtableareavailablewiththemaximumpower

outputconfigurationvaluessetbyanATcommand;butusingthetypicalvaluesisrecommended.

Table 20. Electrical Characteristics of SPK

Parameters Minimum Typical Maximum Unit

Biasing voltage SPKP and SPKN - 1.4 - V

Output swing RL=8Ω: AT+VGR=6*; single ended - - 1 Vpp

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Parameters Minimum Typical Maximum Unit

voltage RL=8Ω: AT+VGR=6*; differential - - 2 Vpp

RL=16Ω or 32Ω: AT+VGR=6*; single

ended - - 1.1 Vpp

RL=16Ω or 32Ω: AT+VGR=6*;

differential - - 2.2 Vpp

RL Load resistance 6 8 -

Ω

IOUT Output current; peak value; RL=8Ω - - 90 mA

POUT RL=8Ω; AT+VGR=10*; - - 65 mW

* The output voltage depends on the output speaker gain set by the AT command. Refer to the WISMO218 AT

Commands Manual for more information about configuring AT commands.

Pin Description

Thefollowingtableprovidesthepindescriptionoftheanalogaudiointerface.

Table 21. Analog Audio Interface Pin Description

Pin # Signal I/O I/O Type Description

1 SPKP O Analog Speaker positive output

2 SPKN O Analog Speaker negative output

3 MICP I Analog Microphone positive input

4 MICN I Analog Microphone negative input

Application

Microphone

Thefollowingsub‐sectionsdescribethedifferentmicrophoneconfigurationexamples.

Differential Connection

WhenadifferentialconnectionofMICisused,itisnecessarytoadda2.2KΩresistorfromMICNto

GNDinordertohaveaproperbiasofthemicrophone.

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

Figure 19. Example of a Differential MIC Connection with an LC Filter



AudioqualitycanbeverygoodwithoutL1,L2,C2,C3andC4dependingonthedesign.Butifthere

isEMIperturbation,thisfiltercanreducetheTDMAnoise.Thisfilter(L1,L2,C2,C3andC4)isnot

mandatory,andifnotused,thecapacitormustberemovedandthecoilreplacedbya0Ωresistoras

showninthefollowingschematic.



Figure 20. Example of a Differential MIC Connection without an LC Filter



ThecapacitorC1ishighlyrecommendedtoeliminateTDMAnoiseandmustbeclosetothe

microphone.

ThefollowingtableliststherecommendedcomponentstouseinimplementingadifferentialMIC

connectionwithoutanLCfilter.

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Customer Design Guidelines

Component Description/Details Notes

C1 12pF to 33pF needs to be tuned depending on the design

C2, C3, C4 47pF needs to be tuned depending on the design

L1, L2 100nH needs to be tuned depending on the design

Single-Ended Connection

Whensingle‐endedconnectionisusedforMIC,MICNisjustleftopen.



Figure 21. Example of a Single-Ended MIC Connection with an LC filter

Note: Z2 is from 200Hz to 4kHz. For more details, refer to Table 18 Electrical Characteristics of MIC.

Whenusingasingle‐endedconnection,bearinmindthat:

• Theinternalinputimpedancevaluebecomes1100Ω,duetotheconnectionoftheotherend

toground.

• ThesingleendeddesignisverysensitivetoTDMAnoise.

• AverygoodgroundingontheMICisamustinordertoensuregoodaudioperformance

againstTDMA.Also,specialcareonthePCBlayoutmustbetaken.

• ItisrecommendedtoaddL1andC2footprintsasanLCfiltertotrytoeliminateTDMA

noise.

• Whennotused,thefiltercanberemovedbyreplacingL1witha0Ωresistorandby

disconnectingC2,asshowninthefollowingschematic.

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

Figure 22. Example of a Single-Ended MIC Connection without an LC Filter

Note: *Z2 is from 200Hz to 4kHz. For more details, refer to Table 18 Electrical Characteristics of MIC.

ThecapacitorC1ishighlyrecommendedtoeliminateTDMAnoiseandmustbeclosetothe

microphone.

Thefollowingtableliststherecommendedcomponentstouseinimplementingasingle‐endedMIC

connectionwithoutanLCfilter.

Component Description/Details Notes

C1 12pF to 33pF needs to be tuned depending on the design

C2 needs to be tuned depending on the design

L1 needs to be tuned depending on the design

Speaker SPKP ad SPKN

Differential Connection

Inadifferentialconnection,simplyconnectbothSPKPandSPKNtothespeaker.

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SPKP

SPKN



Figure 23. Example of a Differential Speaker Connection

Single-Ended Connection

Inasingle‐endedconnection,SPKNcanbeleftopen.Refertothefollowingdiagramforatypical

single‐endedimplementation.



Figure 24. Example of a Single-Ended Speaker Connection



Note: 4.7µF < C1 < 47 µF (Depending on speaker characteristics and output power.)

Whenusingasingle‐endedconnection,bearinmindthat:

• Usingasingle‐endedconnectionincludeslosingoutputpower(‐6dB)ascomparedtoa

differentialconnection.

• TheconnectionbetweentheWISMO228pinsandthespeakermustbedesignedtokeepthe

serialimpedancelowerthan1.5Ω.

Design Recommendations

General

Whenbothspeakerandmicrophoneareexposedtotheexternalenvironment,itisrecommendedto

addESDprotectionasclosetothespeakerormicrophoneaspossible,connectedbetweentheaudio

linesandagoodground.

Whenusingthesingle‐endedconnectionofMICP,ensuretohaveagoodgroundplane,good

filteringaswellasshielding,inordertoavoidanydisturbanceontheaudiopath.

Itisalsoimportanttoselectanappropriatemicrophone,speakerandfilteringcomponentstoavoid

TDMAnoise.

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Recommended Microphone Characteristics

• Theimpedanceofthemicrophonehastobearound2KΩ

• Sensitivityisfrom‐40dBto‐50dB

• SNR>50dB

• FrequencyresponseiscompatiblewithGSMspecifications



TosuppressTDMAnoise,itishighlyrecommendedtousemicrophoneswithtwointernal

decouplingcapacitors:

• CM1=56pF(0402package)fortheTDMAnoisecomingfromthedemodulationofthe

GSM850/EGSM900frequencysignals

• CM2=15pF(0402package)fortheTDMAnoisecomingfromthedemodulationofthe

DCS1800/PCS1900frequencysignals



Thecapacitorshavetobesolderedinparalleltothemicrophoneasshowninthefigurebelow.



Figure 25. Capacitor Soldered in Parallel to the Microphone

Recommended Speaker Characteristics

• Typeofspeakers:Electro‐magnetic/10mW

• Impedance:8Ωforhands‐free

• Impedance:32Ωforheadskit

• Sensitivity:110dBSPLmin

• ReceiverfrequencyresponseiscompatiblewithGSMspecifications.

Recommended Filtering Components

WhendesigningaGSMapplication,itisimportanttoselecttherightaudiofilteringcomponents.

Thestrongestnoise,calledTDMA,ismainlyduetothedemodulationoftheGSM850,EGSM900,

DCS1800andPCS1900signals,whereaburstisproducedevery4.615ms;andthefrequencyofthe

TDMAsignalisequalto216.7Hzplusharmonics.

TDMAnoisecanbesuppressedbyfilteringtheRFsignalusingtheappropriatedecoupling

components.

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Thetypesoffilteringcomponentsare:

• RFdecouplinginductors

• RFdecouplingcapacitors



Agood“ChipS‐Parameter”simulatorisavailablefromMurata.Referto

http://www.murata.com/products/design_support/mcsil/index.htmlformoredetails.

UsingdifferentMuratacomponents,itcanbeseenthatdifferentpackages(withdifferentvaluesand

ratings)canhavedifferentcouplingeffects.Refertothefollowingtableforexamplesusingdifferent

Muratacomponents.

Package 0402

Filtered band GSM900 GSM850/900 DCS/PCS

Value 100nH 56pF 15pF

Types Inductor Capacitor Capacitor

Position Serial Shunt Shunt

Manufacturer Murata Murata Murata

Rated 150mA 50V 50V

Reference LQG15HSR10J02 or

LQG15HNR10J02 GRM1555C1H560JZ01 GRM1555C1H150JZ01 or

GRM1555C1H150JB01

Package 0603

Filtered band GSM900 GSM850/900 DCS/PCS

Value 100nH 47pF 10pF

Types Inductor Capacitor Capacitor

Position Serial Shunt Shunt

Manufacturer Murata Murata Murata

Rated 300mA 50V 50V

Reference LQG18HNR10J00 GRM1885C1H470JA01 or

GRM1885C1H470JB01 GRM1885C1H150JA01 or

GQM1885C1H150JB01

Audio Track and PCB Layout Recommendation

ToavoidTDMAnoise,itisrecommendedtosurroundtheaudiotrackswithgroundasshowninthe

followingfigure.

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

Figure 26. Audio Track Design

Fordifferentialconnections,itisnecessarytoadda2.2KΩresistorfromMICNtoGNDtohavea

properbiasofthemicrophone.



Figure 27. Differential Audio Connection

Forsingle‐endedconnections,thenegativepoleofthemicrophone,MICN,shouldbeconnectedto

GND.

Differential Audio line is

always in parallel

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

Figure 28. Single-Ended Audio Connection

Caution: It is a must to avoid digital tracks crossing under and over the audio tracks.

Even when MICP is singled-ended, it is highly recommended to have the MIC ground and the LC

filter ground to act as an audio analog ground during the PCB layout. This audio ground, together

with the MICP signal, should act as the differential line pair. And this audio ground should only be

connected to the WISMO228 module ground as close as possible to the castellation GND pin of the

WISMO228.

The same case is applicable to SPKP and SPKN.

Also, the audio interface is ESD sensitive. It is a must to add ESD protection to the interface once it

is externally accessible. The recommended ESD protection is the ESDA6VIL from ST.

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Pulse-Width Modulators (PWMs)

TheWISMO228containstwoPulse‐WidthModulators(PWMs)thatcanbeusedinconjunctionwith

anexternaltransistorfordrivingavibrator,orabacklightLED.EachPWMusestwo7‐bitunsigned

binarynumbers:onefortheoutputperiodandoneforthepulsewidthorthedutycycle.

TherelativetimingforthePWMoutputisshowninthefigurebelow.



Figure 29. Relative Timing for the PWM Output

Electrical Characteristics

ThefollowingtabledescribestheelectricalcharacteristicsofthePWMinterface.

Table 22. Electrical Characteristics of the PWM Interface

Parameters Conditions Minimum Typical Maximum Unit

VOH

High impedance load 2.7 2.85 - V

Load with IoH = 4mA - 2.4 - V

VOL - - - 0.1 V

IPEAK - - - 4 mA

Frequency - 25.6 - 1083.3 kHz

Duty cycle - 0* - 100* %

Pin Description

ThefollowingtableprovidesthepindescriptionofthePulse‐WidthModulators.

Table 23. PWM Pin Description

Pin # Signal I/O I/O Type Description

35 PWM1 O 2V8 PWM output

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Pin # Signal I/O I/O Type Description

36 PWM0 O 2V8 PWM output

Application

BoththePWM0andPWM1signalscanbeusedinconjunctionwithanexternaltransistorfordriving

avibrator,orabacklightLED.



Figure 30. Example of an LED Driven by the PWM0 or PWM1 Output



ThevalueofR607canbeharmonizeddependingontheLED(D605)characteristics.

TherecommendeddigitaltransistortouseforT601istheDTC144EEfromROHM.

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BUZZER Output

TheBUZZERsignalcanbeusedinconjunctionwithanexternaltransistor/MOSFETfordrivinga

buzzerinordertogiveamaximumcurrentof100mA(PEAK)andanaverageof40mA,depending

onapplicationrequirement.

Itoutputsasquarewaveatthedesiredtonefrequency.Thetonefrequenciesareprogrammableand

canbere‐programmedon‐the‐flytogeneratemonophonicaudioringtonesoralerttones.Thetone

levelcanalsobeadjustedin4dBsteps,ormuted.



Figure 31. BUZZER Output

Electrical Characteristics

ThefollowingtabledescribestheelectricalcharacteristicsoftheBUZZERsignal.

Table 24. Electrical Characteristics of the BUZZER Signal

Parameters Conditions Minimum Typical Maximum Unit

VOH

High impedance load 2.7 2.85 - V

Load with IoH = 4mA - 2.4 - V

IPEAK - - - 4 mA

VOL - - - 0.1 V

Frequency - 200 - 2500 Hz

Duty cycle - 0* - 100* %

Tone level 4 dB step -24 - 0 dB

* Be mindful of the maximum frequency and the minimum/maximum duty cycle. There is a limitation to these

parameters due to the RC environment. The amplitude modulation becomes less fine when the set limits are

reached.

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Pin Description

ThefollowingtableprovidesthepindescriptionoftheBUZZERsignal.

Table 25. BUZZER Pin Description

Pin # Signal I/O I/O Type Description

34 BUZZER O 2.8V Buzzer output

Application

Themaximumpeakcurrentofthetransistor/MOSFETis100mAandthemaximumaveragecurrent

is40mA,whilethepeakcurrentoftheBUZZERpinshouldbelessthan4mA.Atransientvoltage

suppressordiodemustbeaddedasshownbelow.



Figure 32. Example of a BUZZER Implementation



Where:

• R1mustbechoseninordertolimitthecurrentatI

PEAK

maxto100mAandmustbeadjusted

inrelationtothefrequencyandthedutycycleused.

• D1=BAV70T‐7orBAS16(forexample)

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• T1=FDN335N(forexample)

• R2=0Ω

• R3=1MΩ

Note: A low filter is recommended at low frequencies.

Low Filter Calculations

Tocomputeforthecut‐offfrequency,usetheformulaFc=1/(2*Π*Req*C1)where:

• Fc=cut‐offfrequency

• Req=thetotalresistorsinline

• C1=thecapacitivechargeonT1andtheground



Bearinmindthat:

• FcmustbehigherthanFBUZZ‐OUT

• Fcmustbeatleast64*FBUZZ‐OUT

Note: The frequency modulation of the BUZZER signal is 64*FBUZZ-OUT.

Recommended Characteristics

• Electro‐magnetictype

• Impedance:7to30Ω

• Sensitivity:90dBSPLmin@10cm

• Current:60to90mA



TheBUZZERoutputcanalsobeusedtodriveanLEDasshowninthefigurebelow.

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

Figure 33. Example of an LED Driven by the BUZZER Output

ThevalueofR607canbeharmonizeddependingontheLED(D605)characteristics.

TherecommendeddigitaltransistortouseforT601istheDTC144EEfromROHM.

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ON/~OFF Signal

TheON/~OFFpinisusedtoswitchONorswitchOFFtheWISMO228.Itisinternallyconnectedto

thepermanent3.0VsupplyregulatorinsidetheWISMO228viaapull‐upresistor.Oncethereis

VBATTsupplytotheWISMO228,this3.0VsupplyregulatorwillbeenabledandsotheON/~OFF

signalisbydefaultatHIGHlevel.

ALOWlevelsignalhastobeprovidedontheON/~OFFpintoswitchtheWISMO228ON.

Caution: All external signals must be inactive when the WISMO228 is OFF to avoid any damage when starting

and to allow the WISMO228 to start and stop correctly.

Electrical Characteristics

ThefollowingtabledescribestheelectricalcharacteristicsoftheON/~OFFsignal.

Table 26. Electrical Characteristics of the ON/~OFF Signal

Parameter I/O Type Minimum Typical Maximum Unit

VIH 2V8 2.4 - 3.0 V

VIL 2V8 - - 0.4 V

Pin Description

ThefollowingtableprovidesthepindescriptionoftheON/~OFFsignal.

Table 27. ON/~OFF Signal Pin Description

Pin # Signal I/O I/O Type Description

37 ON/~OFF I 2V8 WISMO228 Power ON/OFF

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Application



Figure 34. Example of the ON/~OFF Pin Connection

Power ON



Figure 35. Power-ON Sequence

Table 28. Power-ON Sequence

Minimum (s) Typical (s) Maximum (s)

Tready 4 5 7

TheON/~OFFsignallevelisdetectedabout250msafterVBATTisavailable.

Note: This timing might be temperature dependant.

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ThevoltageofthissignalhastobepulledLOWforatleast685msforpoweringON.Withinthis

685ms,theWISMO_READYsignalwillinitiallysettoHIGHforabout135msandthenresumeto

LOW.

DuringthepowerONsequence,aninternalresetisautomaticallyperformedfor38ms(typically).

Duringthisphase,anyexternalresetshouldbeavoided.

OncetheWISMO228isproperlypoweredON,theWISMO_READYpinwillsettoHIGHlevelto

acknowledgethesuccessfulpoweringONoftheWISMO228beforeitisreadytooperate.The

ON/~OFFsignalcanbeleftatLOWleveluntilpoweroff.

TherecommendedwaytoreleasetheON/~OFFsignalistodetecttheWISMO_READYsignal

within685msofpoweringONwhilethelevelpulseoftheON/~OFFsignalissettoLOW,andwait

untiltheWISMO_READYsignalgoesHIGHagain.

Power OFF

TheWISMO228canbepoweredoffbyeithersoftwareorhardware.Refertothefollowingdiagram

forthepowerOFFsequence.



Figure 36. Power-OFF Sequence

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Software Power OFF

TheATcommandAT+CPOFisusedtopowerOFFtheWISMO228.

Note: If the ON/~OFF pin is maintained at LOW level when AT+CPOF is used, the module cannot be

switched OFF.

Hardware Power OFF

ALOWlevelpulseisappliedontheON/~OFFpinforTBCseconds.AT+CPOFwillthenbe

automaticallysenttotheWISMO228.

OncetheWISMO228receivestheAT+CPOFcommand,theWISMO228willbeunregisteredfrom

thenetwork.TheWISMO_READYpinwillbecomeLOWtoindicatethatATcommandsareno

longeravailablefortheWISMO228.IftheON/~OFFsignalisHIGH,thentheWISMO228willalso

beswitchedOFF.

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Customer Design Guidelines

WISMO_READY Indication

ThissignalindicatesthestatusoftheWISMO228afterbeingpoweredON.Notethatthereisan

initialpositivepulseoflessthan200msduringpowerON.RefertoFigure35:Power‐ONSequence

formoreinformationregardingthepowerONsequence.OncetheWISMO228isproperlypowered

ON,theWISMO_READYsignalwillsettoHIGHtoacknowledgethesuccessfulpoweringONof

theWISMO228beforeitisreadytooperate.Likewise,thepinwillsettoLOWbeforepoweringOFF.

Electrical Characteristics

ThefollowingtabledescribestheelectricalcharacteristicsoftheWISMO_READYsignal.

Table 29. Electrical Characteristics of the WISMO_READY Indication

Parameters I/O Type Minimum Typical Maximum Unit

VOH 2V8 2.7 2.8 2.95 V

VOL 2V8 - - 0.4 V

Pin Description

ThefollowingtableprovidesthepindescriptionoftheWISMO_READYsignal.

Table 30. WISMO_READY Indication Pin Description

Pin # Signal I/O I/O Type Description

7 WISMO_READY O 2V8 WISMO228 ready indication

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Customer Design Guidelines

VCC_2V8 Output

TheVCC_2V8outputvoltagesupplyisavailablewhentheWISMO228isswitchedONandcanonly

beusedforpull‐upresistor(s)andasareferencesupply.

Electrical Characteristics

ThefollowingtabledescribestheelectricalcharacteristicsoftheVCC_2V8signal.

Table 31. Electrical Characteristics of the VCC_2V8 Signal

Parameters Minimum Typical Maximum Unit

VCC_2V8

Output voltage 2.70 2.80 2.95 V

Output Current

Full-power mode - - 50 mA

Sleep mode - - 3 mA

Pin Description

ThefollowingtableprovidesthepindescriptionoftheVCC_2V8voltagesupply.

Table 32. VCC_2V8 Pin Description

Pin # Signal I/O I/O Type Description

46 VCC_2V8 O Supply Digital supply

Application

Thisdigitalpowersupplyismainlyusedto:

• Pull‐upsignalssuchasI/Os

• SupplythedigitaltransistorsdrivingLEDs

• ActasavoltagereferencefortheADCinterfaceAUX‐ADC0

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BAT-RTC (Backup Battery)

TheBAT‐RTC(backupbattery)pinisusedasaback‐uppowersupplyfortheinternalRealTime

Clock(RTC).VBATTprovidesthepowersupplytotheRTCwhenVBATTisswitchedonbuta

back‐uppowersupplyisneededtosavethedateandhourwhenitisswitchedoff.

IfVBATTisavailable,theback‐upbatterycanbechargedbytheinternal3.0Vpowersupply

regulatorviaa2KΩresistorimplementedinsidetheWISMO228.

IftheRTCisnotused,thispincanbeleftopen.

Electrical Characteristics

ThefollowingtabledescribestheelectricalcharacteristicsoftheBAT‐RTCsignal.

Table 33. Electrical Characteristics of the BAT-RTC Signal

Parameters Minimum Typical Maximum Unit

Input voltage - 3.0 - V

Input current consumption* - 2.5 - µA

Output voltage 2.82 3.0 3.18 V

Max charging current (@VBATT=3.6V) - 0.6 - mA

* Provided by an RTC back-up battery when the WISMO228 is off and VBATT = 0V.

Pin Description

ThefollowingtableprovidesthepindescriptionoftheBAT‐RTCvoltagesupply.

Table 34. BAT-RTC Pin Description

Pin # Signal I/O I/O Type Description

6 BAT-RTC I/O Supply RTC Back-up supply

Application

Thebackuppowersupplycanbeanyofthefollowing:

• Asupercapacitor

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• Anonrechargeablebattery

• Arechargeablebatterycell

Super Capacitor



Figure 37. RTC Supplied by a Gold Capacitor



Estimatedsupplytimewitha0.47Fgoldcapacitor:25minutes(minimum).

Note: The maximum voltage of the gold capacitor is 3.9V.

Non-Rechargeable Battery



Figure 38. RTC Supplied by a Non Rechargeable Battery



Thediode,D1,ismandatorytopreventthenonrechargeablebatteryfrombeingdamaged.

Estimatedsupplytimewithan85mAhbattery:800hours(minimum).

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Rechargeable Battery Cell



Figure 39. RTC Supplied by a Rechargeable Battery Cell



Estimatedsupplytimewithafullycharged3.4mAhrechargeablebattery:7days(minimum).

Caution: Before battery cell assembly, ensure that the cell voltage is lower than 3.0V to avoid damaging the

WISMO228.

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Customer Design Guidelines

TX_CTRL Signal for TX Burst Indication

TheTX_CTRLsignalisa2.8VindicationsignalforTXBurstwitha100KΩpull‐upresistor

implementedinsidetheWISMO228module.

Table 35. TX_CTRL Status

WISMO228 State TX_CTRL Status

During TX burst Low

No TX High



DuringTXburst,therewillbehighercurrentdrainfromtheVBATTpowersupplywhichcausesa

voltagedrop.ThisvoltagedropfromVBATTisagoodindicationofahighcurrentdrainsituation

duringTXburst.



Figure 40. TX_CTRL State During TX Burst

Electrical Characteristics

ThefollowingtabledescribestheelectricalcharacteristicsoftheTX_CTRLsignal.

Table 36. Electrical Characteristics of the TX_CTRL Signal

Parameters Conditions Minimum Typical Maximum Unit

VOH 2.6 - 2.95 V

VOL - - 0.4 V

Tadvance @500mA - 18 - µs

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Parameters Conditions Minimum Typical Maximum Unit

@1A - 27 - µs

Tdelay - 11 - µs

Pin Description

ThefollowingtableprovidesthepindescriptionoftheTX_CTRLsignal.

Table 37. TX_CTRL Signal Pin Description

Pin # Signal I/O I/O Type Reset State Description

18 TX_CTRL O 2V8 1 TX Burst indication

Application

TheTXburstindicationsignal,TX_CTRL,canbeusedtodriveanLEDthroughatransistor.Itcan

beagoodvisualindicatorforanyTXactivities.



Figure 41. Example of a TX Status Implementation



ThevalueofR607canbeharmonizeddependingontheLED(D1)characteristics.

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Reset

The~RESETpinisahardwareresetandshouldonlybeusedforemergencyresets.Ithasa100KΩ

internalpullupresistortoVCC_2V8.

Toactivatethe«emergency»resetsequence,the~RESETsignalhastobesettoLOWlevelmanually.

Thiscanbedonebyusingapushbutton,forexample.



Figure 42. Reset Timing

Electrical Characteristics

Thefollowingtabledescribestheelectricalcharacteristicsofthe~RESETsignal.

Table 38. Electrical Characteristics of the Reset Signal

Parameters Minimum Typical Maximum Unit

Input Impedance ( R )* - 100K - Ω

Input Impedance (C) - 10nF F

Cancellation time (Ta) at power up only - 38 - ms

VH** 1.57 - - V

VIL - 0 1.2 V

VIH 1.96 2.8 -- V

* Internal pull up resistance

** VH : Hysterisis Voltage

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Pin Description

ThefollowingtableprovidesthepindescriptionoftheRESETsignal.

Table 39. Reset Pin Description

Pin # Signal I/O I/O Type Description

12 ~RESET 100K

Pull-up 2V8 WISMO228 Reset

Application

Ifthe«emergency»resetisused,ithastobedrivenbyeitherapushbuttonoranopen

collector/draintransistorasshowninthefiguresbelow.



GND

Push button

~RESET



Figure 43. Example of ~RESET Pin Connection with a Push Button Configuration



GND

~RESET

Reset

command T1

Rohm DTC144EE



Figure 44. Example of ~RESET Pin Connection with a Transistor Configuration



Anopencollectororopendraintransistorcanalsobeusedtodrivethe~RESETpin(duetothe

internalpull‐upresistorembeddedintotheWISMO228).Ifanopencollectorischosen,the

recommendeddigitaltransistortouseforT1istheDTC144EEfromROHM.

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Table 40. Reset Commands

Reset Command ~RESET Operating Mode

1 0 Reset activated

0 1 Reset inactive



Note: It is recommended to add a varistor (such as the AVL5M02200 from AMOTECH) on the ~RESET pin

in order to enhance ESD immunity.

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RF Interface

TheRFinterfaceallowsthetransmissionofradiofrequency(RF)signalsfromtheWISMO228toan

externalantenna.Thisinterfacehasanominalimpedanceof50ΩandaDCresistanceof0Ω.

RF Connection

TheRFinput/outputoftheWISMO228isthroughoneofthecastellationpins(Pin21,ANT),with

groundedcastellationpinsatbothsides.Thiscastellationpinmustbeconnectedtoa50ΩRFlinein

ordertoprotecttheantennalinefromthenoisecomingfrombasebandsignals.



Figure 45. Example of a 50

Ω

RF Line



The50ΩRFlineissurroundedbytwogroundplanesinordertoprotecttheantennalinefrom

noise.Thelengthofthelineshouldn’tbetoolong(nomorethanafewcentimeters)becauseofRF

insertionloss.Thewidthofthelinemustbecalculatedinordertoensurea50Ωcharacteristic

impedance.

Forthissamereason,theembeddedRFlineshouldlikewisebekeptabout1cmawayfromany

(noisy)basebandsignalinordertoensureagoodRXsensitivitylevel.

Theotherendofthe50ΩRFlinecanbeconnectedtoanRFconnectorortoasolderingpadinorder

toconnectanantenna.ItisalsopossibletouseanantennachiportodesignaPCBantennadirectly

ontheapplicationboard.

TheANTpinoftheWISMO228isESDprotectedforboth±4KVcontactand±8KVairdischarge.

Note: The correct antenna cable and connector should be chosen in order to minimize loss in the frequency

bands used for GSM800, EGSM900, DCS1800 and PCS1900.

Castellation pin

for ANT

50Ω RF line

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0.5dB can be considered as the maximum value for loss between the WISMO228 and an external

connector.

RF Performances

RFperformancesarecompliantwithETSIrecommendationGSM05.05.Listedbelowarethemain

parametersforboththeReceiverandtheTransmitter.



ThemainparametersfortheReceiverare:

• GSM850/EGSM900ReferenceSensitivity=‐108dBm(typ.)

• DCS1800/PCS1900ReferenceSensitivity=‐108dBm(typ.)

• Selectivity@200kHz:>+9dBc

• Selectivity@400kHz:>+41dBc

• Lineardynamicrange:63dB

• Co‐channelrejection:>=9dBc



ThemainparametersfortheTransmitterare:

• Maximumoutputpower(EGSM):33dBm+/‐2dBatambienttemperature

• Maximumoutputpower(GSM1800):30dBm+/‐2dBatambienttemperature

• Minimumoutputpower(EGSM):5dBm+/‐5dBatambienttemperature

• Minimumoutputpower(GSM1800):0dBm+/‐5dBatambienttemperature

Antenna Specifications

Theoptimumoperatingfrequencydependsontheapplication.Adual‐bandoraquad‐bandantenna

willworkinthefollowingfrequencybandsandshouldhavethefollowingcharacteristics.

Table 41. Antenna Specifications

Characteristic WISMO228

GSM 850 E-GSM 900 DCS 1800 PCS 1900

TX Frequency 824 to 849 MHz 880 to 915 MHz 1710 to 1785 MHz 1850 to 1910 MHz

RX Frequency 869 to 894 MHz 925 to 960 MHz 1805 to 1880 MHz 1930 to 1990 MHz

Impedance 50Ω

VSWR

Rx max 1.5 :1

Tx max 1.5 :1

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Characteristic WISMO228

Typical radiated gain 0dBi in one direction at least

Caution: Both mechanical and electrical antenna adaptations are key issues in the design of a GSM terminal.

It is strongly recommended to work with an antenna manufacturer to either develop an antenna

adapted to the application or to adapt an existing solution to the application.

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5. Consumption Measurement

Procedure

ThischapterdescribestheconsumptionmeasurementprocedureusedtoobtaintheWISMO228

consumptionspecification.

TheWISMO228consumptionspecificationvaluesaremeasuredforalloperatingmodesavailableon

theproduct.

Hardware Configuration

Consumptionresultsarehighlydependentonthehardwareconfigurationusedduring

measurementandthissectiondescribesthehardwareconfigurationsettingsthatmustbeusedto

obtainoptimumconsumptionmeasurements.

Thefollowinghardwareconfigurationincludesboththemeasurementequipmentandthe

WISMO228withitssocket‐upboardontheWISMO218developmentkit.

Equipments

Fourdevicesareusedtoperformconsumptionmeasurement:

• Acommunicationtester

• Acurrentmeasuringpowersupply

• Astandalonepowersupply

• Acomputer,tocontroltheWISMO228andsavemeasurementdata

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

Figure 46. Typical Hardware Configuration



ThecommunicationtesterisaCMU200fromRhode&Schwartz.ThistesteroffersallGSM/GPRS

networkconfigurationsrequiredandallowsawiderangeofnetworkconfigurationstobeset.

TheAX502standalonepowersupplyisusedtosupplyallmotherboardcomponentsexceptthe

WISMO228.ThisisdonewiththeobjectivetoseparatetheWISMO218DevelopmentKitboard

consumptionfromtheWISMO228consumption–whichismeasuredbytheotherpowersupply,

the66321Bcurrentmeasuringpowersupply.Boththestandalonepowersupplyandthecurrent

measuringpowersupplyareconnectedtoandcontrolledbythecomputer(GPIBcontrol,whichis

notshowninthefigure).

Thestandalonepowersupply,AX502(orVBAT),maybesetfrom3.2Vto4.8V;whilethecurrent

measurepowersupply,66321B(orVBATT),mayalsobesetfrom3.2Vto4.8accordingtothe

WISMO228VBATTspecifications.

ASIMmustbeinsertedintheWISMO218DevelopmentKitduringallconsumptionmeasurement.

Thefollowingtableliststherecommendedequipmentstousefortheconsumptionmeasurement.

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Table 42. List of Recommended Equipments

Device Manufacturer Reference Notes

Communication Tester Rhode & Schwartz CMU 200 Quad Band

GSM/DCS/GPRS

Current measuring

power supply Agilent 66321B

Used for VBATT (supplies the

WISMO228)

Stand alone power

supply Metrix AX502

Used for VBAT (supplies the

WISMO218 development kit board)

WISMO218 Development Kit

TheWISMO218DevelopmentKitisusedasabasisfortheWISMO228measurementviaanadaptor

boardandisusedtoperformconsumptionmeasurementusingseveralsettings.Refertothe

WISMO218DevelopmentKitUserGuideandtheWISMO218HardwarePresentationformore

informationaboutthesesettings.

Note: The WISMO218 Development Kit can be replaced by WMP100 Development Kit once a suitable

socket-up board is available.

TheWISMO218DevelopmentKitboardispoweredbythestandalonepowersupplyatVBAT;while

theWISMO228ispoweredbythecurrentmeasuringpowersupplyatVBATT.Itisforthisreason

thatthelinkbetweenVBATTandVBAT(J605)mustbeopened(byremovingthesolderatthetopof

theboardintheSUPPLYarea).Notethefollowinginformationregardingbothpowersupplies.

• VBATTispoweredbythecurrentmeasuringpowersupply(66321B)

• VBATispoweredbythestandalonepowersupply(AX502)throughTP602



Alsotakenoteofthefollowingadditionalconfiguration/settings:

• TheR600resistorandtheD603andD604diodes(aroundtheBAT‐TEMPconnector)must

beremoved.

• TheUART2linkisnotused;therefore,J201,J202,J203,J204mustbeopened(byremoving

thesolder).

• The“FLASH‐LED”mustbenotused,soJ602mustbeopened(byremovingthesolder).

• TheUSBlinkisnotused;therefore,J301,J302,J303,J304,J305mustbeopened(byremoving

thesolder).

• Audioisnotused;therefore,J702,J703,J704,J705,J605mustbeopened(byremovingthe

solder).

• ThereisnoSIMdetectfeatureontheWISMO228;therefore,J403mustbeopened(by

removingthesoldered).

• Chargingisnotused;therefore,R602mustberemoved.

• C600andR607mustberemovedtoavoidunexpectedcurrentconsumption.

• Theswitch,BOOT(aroundthe“CONFIG”area),mustbesettotheOFFposition.

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Product Technical Specification &

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

ThegoalofthesettingslistedaboveistoeliminateallbiascurrentfromVBATTandtosupplythe

entireboard(excepttheWISMO228)usingonlyVBAT.

Socket-Up Board

Anadaptorboard,theWISMO218Socket‐UpBoard(WM0801706‐020‐20),isusedtoconnectthe

WISMO228toworkontheWISMO218DevelopmentKit.

Onthissocket‐upboard,thesolderingpointsofJ203,J204,JP101,JP102,JP103,JP104,JP105,JP106

andJP107mustbeopened.

SIM Cards

Consumptionmeasurementmaybeperformedwitheither3‐Voltor1.8‐VoltSIMcards.However,

allspecifiedconsumptionvaluesarefora3‐VoltSIMcard.

Caution: The SIM card’s voltage is supplied by the WISMO228’s power supply. Consumption measurement

results may vary depending on the SIM card used.

Software Configuration

Thissectiondiscussesthesoftwareconfigurationfortheequipment(s)usedandtheWISMO228

settings.

WISMO228 Configuration

TheWISMO228softwareconfigurationissimplyperformedbyselectingtheoperatingmodetouse

inperformingthemeasurement.

Adescriptionoftheoperatingmodesandtheproceduresusedtochangetheoperatingmodeare

givenintheappendixofWISMO218ATCommandsManual.

TheavailableoperatingmodesintheWISMO228areasfollows:

• OFFMode

• AlarmMode

• IdleMode

• ConnectedMode

• TransferModeclass8(4Rx/1Tx)(inGPRSmode)

• TransferModeclass10(3Rx/2Tx)(inGPRSmode)

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Equipment Configuration

ThecommunicationtesterissetaccordingtotheWISMO228operatingmode.Pagingduringidle

modes,TXburstpower,RFbandandGSM/DCS/GPRSmaybeselectedonthecommunication

tester.

Refertothefollowingtableforthenetworkanalyzerconfigurationaccordingtooperatingmode.

Table 43. Operating Mode Information

Operating Mode Communication Tester Configuration

OFF Mode N/A

Alarm Mode N/A

Idle Mode

Paging 2 (Rx burst occurrence ~0,5s)

Paging 9 (Rx burst occurrence ~2s)

Connected Mode

850 MHz

PCL5 (TX power 33dBm)

PCL19 (TX power 5dBm)

900 MHz

PCL5 (TX power 33dBm)

PCL19 (TX power 5dBm)

1800MHz

PCL0 (TX power 30dBm)

PCL15 (TX power 0dBm)

1900 MHz

PCL0 (TX power 30dBm)

PCL15 (TX power 0dBm)

GPRS

Transfer Mode class 8

(4Rx/1Tx)

850 MHz

Gam.3 (TX power 33dBm)

Gam.17 (TX power 5dBm)

900 MHz

Gam.3 (TX power 33dBm)

Gam.17 (TX power 5dBm)

1800MHz

Gam.3 (TX power 30dBm)

Gam.18 (TX power 0dBm)

1900 MHz

Gam.3 (TX power 30dBm)

Gam.18 (TX power 0dBm)

Transfer Mode class 10 850 MHz Gam.3 (TX power 33dBm)

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Operating Mode Communication Tester Configuration

(3Rx/2Tx) Gam.17 (TX power 5dBm)

900 MHz

Gam.3 (TX power 33dBm)

Gam.17 (TX power 5dBm)

1800MHz

Gam.3 (TX power 30dBm)

Gam.18 (TX power 0dBm)

1900 MHz

Gam.3 (TX power 30dBm)

Gam.18 (TX power 0dBm)

Template

Thistemplatemaybeusedforconsumptionmeasurementforallmodesandconfigurations

available.NotethatthreeVBATTvoltagesareusedtomeasureconsumption,namely:VBATTmin

(3.2V),VBATTtyp(3.6V)andVBATTmax(4.8V).Theminimum/maximumRFtransmissionpower

configurationsarealsosetandmeasured.

Table 44. WISMO228 Power Consumption

WISMO228 Power Consumption

Operating Mode Parameters IMIN

average

VBATT=4.8V

INOM

average

VBATT=3.6V

IMAX

average

VBATT=3.2

IMAX peak Unit

Off Mode* µA

Alarm Mode µA

Idle Mode

TBD

Paging 9 (Rx burst

occurrence ~2s) mA

Connected Mode

850 MHz

PCL5 (TX

power 33dBm) mA

PCL19 (TX

power 5dBm) mA

900 MHz PCL5 (TX

power 33dBm) mA

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Product Technical Specification &

Customer Design Guidelines

PCL19 (TX

power 5dBm) mA

1800 MHz

PCL0 (TX

power 30dBm) mA

PCL15 (TX

power 0dBm) mA

1900 MHz

PCL0 (TX

power 30dBm) mA

PCL15 (TX

power 0dBm)

mA

GPRS

Transfer

Mode class

8 (4Rx/1Tx)

850 MHz

Gam.3 (TX

power 33dBm) mA

Gam.17 (TX

power 5dBm)

mA

900 MHz

Gam.3 (TX

power 33dBm) mA

Gam.17 (TX

power 5dBm)

mA

1800 MHz

Gam.3 (TX

power 30dBm) mA

Gam.18 (TX

power 0dBm)

mA

1900 MHz

Gam.3 (TX

power 30dBm) mA

Gam.18 (TX

power 0dBm)

mA

Transfer

Mode class

10 (3Rx/2Tx)

850 MHz

Gam.3 (TX

power 33dBm) mA

Gam.17 (TX

power 5dBm)

mA

900 MHz

Gam.3 (TX

power 33dBm) mA

Gam.17 (TX

power 5dBm)

mA

1800 MHz

Gam.3 (TX

power 30dBm) mA

Gam.18 (TX

power 0dBm)

mA

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Product Technical Specification &

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1900 MHz

Gam.3 (TX

power 30dBm) mA

Gam.18 (TX

power 0dBm)

mA

* Current consumption in OFF mode is measured with BAT-RTC being left open.

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6. Technical Specifications

Castellation Pins

Pin Configuration



Figure 47. WISMO228 Pin Configuration



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Pin Description

Table 45. WISMO228 Castellation Pin Description

Pin # Signal Description I/O Pin # Signal Description I/O

1 SPKP Speaker output

positive 32 ohms Analog 24 GPIO1 2.8V GPIO I/O

2 SPKN Speaker output

negative 32 ohms Analog 25 SPI-IRQ 2.8V SPI interrupt

request input I

3 MICP Microphone input

positive Analog 26 GND Ground Ground

4 MICN Microphone input

negative Analog 27 NC Not connected -

5 AUX_ADC

0 Analog to digital

converter I 28 GND Ground Ground

6 BAT-RTC Power supply for RTC

backup I 29 VBATT Power supply I

7 WISMO_R

EADY 2.8V WISMO Ready O 30 VBATT Power supply I

8 SIM-VCC SIM power supply O 31 GND Ground Ground

9 SIM-CLK SIM clock O 32 NC Not connected -

10 SIM-IO SIM data I/O 33 NC Not connected -

11 ~SIM-RST SIM reset O 34 BUZZER 2.8V Buzzer PWM2 O

12 ~RESET input reset signal I 35 PWM1 2.8V DC PWM 1 O

13 SPI-IO 2.8V SPI data input I/O 36 PWM0 2.8V DC PWM 0 O

14 SPI-O 2.8V SPI data output O 37 On/~OFF Power On control

signal I

15 SPI-CLK 2.8V SPI clock output O 38 CT103/T

XD* 2.8V UART1:

Transmit data I

16 GPIO3 2.8V GPIO I/O 39 ~CT105/

RTS* 2.8V UART1:

Request to send I

17 ~SPI-CS 2.8V SPI chip select

output O 40 CT104/R

XD* 2.8V UART1:

Receive data O

18 TX_CTRL 2.8V TX Burst

Indicator O 41 ~CT106/

CTS* 2.8V UART1: Clear

to send O

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Pin # Signal Description I/O Pin # Signal Description I/O

19 GPIO5 2.8V GPIO I/O 42 ~CT107/

DSR 2.8V UART1: Data

set ready O

20 GND Ground Ground 43 ~CT109/

DCD 2.8V UART1: Data

carrier detect O

21 ANT Radio antenna

connection I/O 44 ~CT108/

DTR 2.8V UART1: Data

terminal ready I

22 GND Ground Ground 45 ~CT125/

RI 2.8V UART1: Ring

indicator O

23 GND Ground Ground 46 VCC_2V

8 2.8V power supply

from module O

* UART signal names are according to PC view.

* The I/O direction information only concerns the nominal signal. When the signal is configured in GPIO, it can

either be an Input or an Output.

Recommended Connection When Not Used

Thetablebelowgivestherecommendedconnectionforanyunusedpins.

Table 46. Recommended Connection When Not Used

Pin # Signal Recommended

Connection When Not

Used Pin # Signal Recommended

Connection When Not

Used

SPKP Open

GPIO1 Open

SPKN Open

SPI-IRQ PCB test point

MICP Open

GND Ground

MICN Open

NC Not connected

AUX_ADC0 Ground

GND Ground

BAT-RTC Open

VBATT Power supply

WISMO_READY Open

VBATT Power supply

SIM-VCC SIM power supply

GND Ground

SIM-CLK SIM clock

NC Not connected

SIM-IO SIM data

NC Not connected

~SIM-RST SIM reset

BUZZER Open

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Product Technical Specification &

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Pin # Signal Recommended

Connection When Not

Used Pin # Signal Recommended

Connection When Not

Used

~RESET Open

PWM1 Open

SPI-IO PCB test point

PWM0 Open

SPI-O PCB test point

On/~OFF Power On control signal

SPI-CLK PCB test point

CT103/TXD* 2.8V UART1: Transmit data

GPIO3 Open

~CT105/RTS* Connect to ~CT106/CTS

~SPI-CS PCB test point

CT104/RXD* 2.8V UART1: Receive data

TX_CTRL Not Connected

~CT106/CTS* Connect to ~CT105/RTS*

GPIO5 Open

~CT107/DSR Connect to ~CT108/DTR**

GND Ground

~CT109/DCD Open

ANT Radio antenna connection

~CT108/DTR Connect to ~CT107/DSR**

GND Ground

~CT125/RI Open

GND Ground

VCC_2V8 Open

* The I/O direction information only concerns the nominal signal. When the signal is configured in GPIO, it can

either be an Input or an Output.

** Refer to Table 11: Main Serial Link Pin

Description of the section discussing the SPI Bus

for Debug Trace ONLY

TheWISMO228providesoneSPIbusthroughthecastellationpin.

Caution: This interface is only used for monitoring trace for debug purposes.

Pin Description

ThefollowingtableprovidesthepindescriptionoftheSPIbus.

Table 47. SPI Bus Pin Description

Pin # Signal I/O I/O Type Reset State Description

13 SPI-IO I/O 2V8 Pull down SPI Serial input/output

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Pin # Signal I/O I/O Type Reset State Description

14 SPI-O O 2V8 Pull down SPI Serial input

15 SPI-CLK O 2V8 Pull down SPI Serial Clock

17 ~SPI-CS O 2V8 Pull up SPI Enable

25 SPI-IRQ I 2V8 Pull down SPI Interrupt



AnSPI‐to‐UART2conversioncircuitisrequiredtoconverttheSPItracetoUART2.Also,theSPI‐

IRQ(pin25)isrequiredforinterrupt.Again,notethattheSPIinterfaceoftheWISMO228isnot

openforapplicationuseotherthandebugtrace.

SPI Waveforms



Figure 48. SPI Timing Diagram



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

Figure 49. Example of an SPI to UART2 Interface Conversion Implementation



ThefollowingtableliststherecommendedcomponentstouseinimplementingtheSPItoUART2

interface.

Component Description/Details Manufacturer

U103 SC16IS750IPW NXP Semiconductors

X101 3, 6864MHz 86SMX surface mount crystal (971-

3131) Farnell

R104, R105 10KΩ

R106 1KΩ

C105 22pF

C106 33pF

C107 100nF

AfterconvertingtheSPIsignaltoaUARTsignal,aUARTtransceivercircuitryisneededto

communicatethisUARTsignaltotheDTE.

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

Figure 50. Example of an RS-232 Level Shifter Implementation for UART2



ThefollowingtableliststherecommendedcomponentstouseinimplementingaUARTtransceiver

circuitry.

Component Description/Details Manufacturer

U200 LTC2804IGN-1 LINEAR TECHNOLOGY

L200 LQH2M CN100K02L MURATA

J200 096615276119 SUBD9F HARTING

R202 NC

R204 100KΩ

C200 1µF

C201 220nF

C207 1µF

C208 1µF

Note: It is recommended to make SPI signals accessible for diagnostics by reserving some test points, for

example.



Main Serial Link (UART) for more information regarding the connection between DSR and DTR.

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Product Technical Specification &

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PCB Specifications for the Application Board

Inordertosavecostsforsimpleapplications,acheapPCBstructurecanbeusedfortheapplication

boardoftheWISMO228.A4‐layerthrough‐holetypePCBstructurecanbeused.



Figure 51. PCB Structure Example for the Application Board

Note: Due to the limited layers of 4-layer PCBs, sensitive signals like audio, SIM and clocks cannot be

protected by 2 adjacent ground layers. As a result, care must be taken during PCB layout for these

sensitive signals by avoiding coupling to noisy baseband through adjacent layers.

Environmental Specifications

TheWISMO228iscompliantwiththefollowingoperatingclasses.Thetablebelowliststheideal

temperaturerangeoftheenvironment.

Table 48. Operating Class Temperature Range

Conditions Temperature Range

Operating / Class A -20 °C to +55°C

Operating / Class B -40 °C to +85°C

Storage -40 °C to +85°C

Function Status Classification

Class A

TheWISMO228remainsfullyfunctional,meetingGSMperformancecriteriainaccordancewith

ETSIrequirements,acrossthespecifiedtemperaturerange.

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Product Technical Specification &

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Class B

TheWISMO228remainsfullyfunctionalacrossthespecifiedtemperaturerange.SomeGSM

parametersmayoccasionallydeviatefromtheETSIspecifiedrequirementsandthisdeviationdoes

notaffecttheabilityoftheWISMO228toconnecttothecellularnetworkandbefullyfunctional,as

itdoeswithintheClassArange.



Thedetailedclimaticandmechanicsstandardenvironmentalconstraintsapplicabletothe

WISMO228arelistedinthetablebelow.

Table 49. Environmental Classes



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Product Technical Specification &

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Mechanical Specifications

Physical Characteristics

TheWISMO228hasanearly‐completeself‐containedshield.

• Overalldimensions:25.0x25.0x2.8mm(excludinglabelthickness)

• Weight:3.64g

Recommended PCB Landing Pattern

RefertotheCustomerProcessGuidelineforWISMOSeriesdocument.

WISMO228 Dimensions

<tofollow>

Figure 52. WISMO228 Dimensions

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Product Technical Specification &

Customer Design Guidelines

7. Recommended Peripheral

Devices

General Purpose Connector

Thegeneralpurposeconnectorisa46‐pincastellationconnectorwitha1.5mmpitch.

SIM Card Reader

ListedbelowaretherecommendedSIMCardReaderstousewiththeWISMO228.

• ITTCANNONCCM03series(seehttp://www.ittcannon.com)

• AMPHENOLC707series(seehttp://www.amphenol.com)

• JAE(seehttp://www.jae.co.jp/e‐top/index.html)



Drawertype:

• MOLEX99228‐0002(connector)/MOLEX91236‐0002(holder)(seehttp://www.molex.com)

Microphone

Microphonescanbeobtainedfromthefollowingrecommendedsuppliers:

• HOSIDEN

• PANASONIC

• PEIKER

Speaker

Speakerscanbeobtainedfromthefollowingrecommendedsuppliers:

• SANYO

• HOSIDEN

• PRIMO

• PHILIPS

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Antenna Cable

ListedbelowaretherecommendedantennacablestomountontheWISMO228.

• RG178

• RG316

GSM Antenna

GSMantennasandsupportforantennaadaptationcanbeobtainedfrommanufacturerssuchas:

• ALLGON(http://www.allgon.com)

• HIRSCHMANN(http://www.hirschmann.com/)

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8. Noises and Design

EMC Recommendations

EMCtestshavetobeperformedassoonaspossibleontheapplicationtodetectanypossible

problems.

WhendesigningaGSMterminal,makesuretotakenoteofthefollowingitems:

• PossiblespuriousemissionsradiatedbytheapplicationtotheRFreceiverinthereceiver

band.

• ESDprotectionismandatoryforallperipheralsaccessiblefromoutside(SIM,seriallink,

audio,AUX_ADC0,etc.).

• EMCprotectiononaudioinput/output(filtersagainst900MHzemissions).

• Biasingofthemicrophoneinputs.

• LengthoftheSIMinterfacelines(preferably<10cm).

• Groundplane:Itisrecommendedtohaveacommongroundplaneforanalog/digital/RF

grounds.

• Itisrecommendedtouseametalliccaseorplasticcasingwithconductivepaint.

Power Supply

ThepowersupplyisoneofthekeyissuesinthedesignofaGSMterminalandcarefulattention

shouldbepaidtothefollowing:

• Qualityofthepowersupply:lowripple,PFMorPSMsystemsshouldbeavoided(usinga

PWMconverterispreferred).

• Thecapacitytodeliverhighcurrentpeaksinashorttime(pulsedradioemission).



Aweakpowersupplydesigncouldaffectthefollowingitemsspecifically:

• EMCperformances

• Theemissionsspectrum

• Phaseerrorandfrequencyerror

Overvoltage

TheWISMO228doesnotincludeanyprotectionagainstovervoltage.



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9. Appendix

Standards and Recommendations

GSM ETSI, 3GPP, and GCF recommendations for Phase II

Specification Reference Title

3GPP TS 45.005 v5.5.0 (2002-08)

Release 5 Technical Specification Group GSM/EDGE. Radio Access Network;

Radio transmission and reception

GSM 02.07 V8.0.0 (1999-07) Digital cellular telecommunications system (Phase 2+);

Mobile Stations (MS) features (GSM 02.07 version 8.0.0 Release 1999)

GSM 02.60 V8.1.0 (1999-07)

Digital cellular telecommunications system (Phase 2+);

General Packet Radio Service (GPRS); Service description, Stage 1

(GSM 02.60 version 8.1.0 Release 1999)

GSM 03.60 V7.9.0 (2002-09)

Technical Specification Group Services and System Aspects;

Digital cellular telecommunications system (Phase 2+); General Packet

Radio Service (GPRS); Service description; Stage 2 (Release 1998)

3GPP TS 43.064 V5.0.0 (2002-04)

Technical Specification Group GERAN; Digital cellular

telecommunications system (Phase 2+); General Packet Radio Service

(GPRS); Overall description of the GPRS radio interface; Stage 2

(Release 5)

3GPP TS 03.22 V8.7.0 (2002-08) Technical Specification Group GSM/EDGE. Radio Access Network;

Functions related to Mobile Station (MS) in idle mode and group receive

mode; (Release 1999)

3GPP TS 03.40 V7.5.0 (2001-12)

Technical Specification Group Terminals;

Technical realization of the Short Message Service (SMS)

(Release 1998)

3GPP TS 03.41 V7.4.0 (2000-09) Technical Specification Group Terminals; Technical realization of Cell

Broadcast Service (CBS) (Release 1998)

ETSI EN 300 903 V8.1.1 (2000-11)

Digital cellular telecommunications system (Phase 2+);

Transmission planning aspects of the speech service in the GSM

Public Land Mobile Network (PLMN) system (GSM 03.50 version 8.1.1

Release 1999)

3GPP TS 04.06 V8.2.1 (2002-05) Technical Specification Group GSM/EDGE Radio Access Network;

Mobile Station - Base Station System (MS - BSS) interface; Data Link

(DL) layer specification (Release 1999)

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Specification Reference Title

3GPP TS 04.08 V7.18.0 (2002-09)

Technical Specification Group Core Network;

Digital cellular telecommunications system (Phase 2+);

Mobile radio interface layer 3 specification (Release 1998)

3GPP TS 04.10 V7.1.0 (2001-12)

Technical Specification Group Core Networks;

Mobile radio interface layer 3 Supplementary services specification;

General aspects (Release 1998)

3GPP TS 04.11 V7.1.0 (2000-09)

Technical Specification Group Core Network; Digital cellular

telecommunications system (Phase 2+); Point-to-Point (PP) Short

Message Service (SMS) support on mobile radio interface

(Release 1998)

3GPP TS 45.005 v5.5.0 (2002-08) Technical Specification Group GSM/EDGE. Radio Access Network;

Radio transmission and reception (Release 5)

3GPP TS 45.008 V5.8.0 (2002-08) Technical Specification Group GSM/EDGE

Radio Access Network; Radio subsystem link control (Release 5)

3GPP TS 45.010 V5.1.0 (2002-08) Technical Specification Group GSM/EDGE

Radio Access Network; Radio subsystem synchronization (Release 5)

3GPP TS 46.010 V5.0.0 (2002-06) Technical Specification Group Services and System Aspects;

Full rate speech; Transcoding (Release 5)

3GPP TS 46.011 V5.0.0 (2002-06)

Technical Specification Group Services and System Aspects;

Full rate speech; Substitution and muting of lost frames for

full rate speech channels (Release 5)

3GPP TS 46.012 V5.0.0 (2002-06)

Technical Specification Group Services and System Aspects;

Full rate speech; Comfort noise aspect for full rate speech traffic

channels (Release 5)

3GPP TS 46.031 V5.0.0 (2002-06)

Technical Specification Group Services and System Aspects;

Full rate speech; Discontinuous Transmission (DTX) for full rate speech

traffic channels (Release 5)

3GPP TS 46.032 V5.0.0 (2002-06)

Technical Specification Group Services and System Aspects;

Full rate speech; Voice Activity Detector (VAD) for full rate speech traffic

channels (Release 5)

TS 100 913V8.0.0 (1999-08)

Digital cellular telecommunications system (Phase 2+);

General on Terminal Adaptation Functions (TAF) for Mobile Stations

(MS) (GSM 07.01 version 8.0.0 Release 1999)

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Specification Reference Title

GSM 09.07 V8.0.0 (1999-08)

Digital cellular telecommunications system (Phase 2+);

General requirements on interworking between the Public Land Mobile

Network (PLMN) and the Integrated Services Digital Network (ISDN) or

Public Switched Telephone Network (PSTN) (GSM 09.07 version 8.0.0

Release 1999)

3GPP TS 51.010-1 v5.0.0 (2002-

09)

Technical Specification Group GSM/EDGE ; Radio Access

Network ;Digital cellular telecommunications system (Phase 2+);Mobile

Station (MS) conformance specification; Part 1: Conformance

specification (Release 5)

3GPP TS 51.011 V5.0.0 (2001-12) Technical Specification Group Terminals; Specification of the Subscriber

Identity Module - Mobile Equipment (SIM - ME) interface (Release 5)

ETS 300 641 (1998-03)

Digital cellular telecommunications system (Phase 2);

Specification of the 3 Volt Subscriber Identity Module - Mobile Equipment

(SIM-ME) interface (GSM 11.12 version 4.3.1)

GCF-CC V3.7.1 (2002-08) Global Certification Forum – Certification criteria

TheWISMO228canonlybeusedformobileandfixedapplications.Theantenna(s)usedforthe

transmittermustbeinstalledataminimumdistanceof20cmfromallpersonsandmustnotbeco‐

locatedoroperatedwithanyotherantennaortransmitter.

Usersandinstallersmustbeprovidedwithantennainstallationinstructionsandtransmitter

operatingconditionsforsatisfyingRFexposurecompliance.

Notethatwheninstalledinportabledevices,theRFexposureconditionrequiresaseparate

mandatoryequipmentauthorizationforthefinaldevice.



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Safety Recommendations (for Information Only)

Warning: For the efficient and safe operation of your GSM application

based on the WISMO228, please read the following information

carefully.

RF Safety

General

YourGSMterminalisbasedontheGSMstandardforcellulartechnology.TheGSMstandardis

spreadallovertheworld.ItcoversEurope,AsiaandsomepartsofAmericaandAfrica.Thisisthe

mostusedtelecommunicationstandard.

YourGSMterminalisactuallyalowpowerradiotransmitterandreceiver.Itsendsoutandreceives

radiofrequencyenergy.WhenyouuseyourGSMapplication,thecellularsystemwhichhandles

yourcallscontrolsboththeradiofrequencyandthepowerlevelofyourcellularmodem.

ExposuretoRFEnergy

TherehasbeensomepublicconcernaboutpossiblehealtheffectsfromusingGSMterminals.

AlthoughresearchonhealtheffectsfromRFenergyhasfocusedonthecurrentRFtechnologyfor

manyyears,scientistshavebegunresearchregardingnewerradiotechnologies,suchasGSM.After

existingresearchhadbeenreviewed,andaftercompliancetoallapplicablesafetystandardshad

beentested,ithasbeenconcludedthattheproductwasfitforuse.

IfyouareconcernedaboutexposuretoRFenergytherearethingsyoucandotominimizeexposure.

Obviously,limitingthedurationofyourcallswillreduceyourexposuretoRFenergy.Inaddition,

youcanreduceRFexposurebyoperatingyourcellularterminalefficientlybyfollowingthe

guidelinesbelow.

EfficientTerminalOperation

ForyourGSMterminaltooperateatthelowestpowerlevel,consistentwithsatisfactorycallquality:

Ifyourterminalhasanextendibleantenna,extenditfully.Somemodelsallowyoutoplaceacall

withtheantennaretracted.However,yourGSMterminaloperatesmoreefficientlywiththeantenna

fullyextended.

Donotholdtheantennawhentheterminalis«INUSE».Holdingtheantennaaffectscallquality

andmaycausethemodemtooperateatahigherpowerlevelthanneeded.

AntennaCareandReplacement

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DonotusetheGSMterminalwithadamagedantenna.Ifadamagedantennacomesintocontact

withtheskin,aminorburnmayresult.Replaceadamagedantennaimmediately.Consultyour

manualtoseeifyoumaychangetheantennayourself.Ifso,useonlyamanufacturer‐approved

antenna.Otherwise,haveyourantennarepairedbyaqualifiedtechnician.

Useonlythesuppliedorapprovedantenna.Unauthorizedantennas,modificationsorattachments

coulddamagetheterminalandmaycontravenelocalRFemissionregulationsorinvalidatetype

approval.

General Safety

Driving

Checkthelawsandtheregulationsregardingtheuseofcellulardevicesintheareawhereyouhave

todriveasyoualwayshavetocomplywiththem.WhenusingyourGSMterminalwhiledriving,

please:

• givefullattentiontodriving,

• pullofftheroadandparkbeforemakingoransweringacallifdrivingconditionsso

require.

ElectronicDevices

Mostelectronicequipment,forexampleinhospitalsandmotorvehicles,isshieldedfromRFenergy.

However,RFenergymayaffectsomeimproperlyshieldedelectronicequipment.

VehicleElectronicEquipment

Checkyourvehiclemanufacturerrepresentativetodetermineifanyon‐boardelectronicequipment

isadequatelyshieldedfromRFenergy.

MedicalElectronicEquipment

Consultthemanufacturerofanypersonalmedicaldevices(suchaspacemakers,hearingaids,etc...)

todetermineiftheyareadequatelyshieldedfromexternalRFenergy.

TurnyourterminalOFFinhealthcarefacilitieswhenanyregulationspostedintheareainstructyou

todoso.HospitalsorhealthcarefacilitiesmaybeusingRFmonitoringequipment.

Aircraft

TurnyourterminalOFFbeforeboardinganyaircraft.

• Useitonthegroundonlywithcrewpermission.

• Donotuseitintheair.

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Topreventpossibleinterferencewithaircraftsystems,FederalAviationAdministration(FAA)

regulationsrequireyoutohavepermissionfromacrewmembertouseyourterminalwhilethe

aircraftisontheground.Topreventinterferencewithcellularsystems,localRFregulationsprohibit

usingyourmodemwhileairborne.

Children

DonotallowchildrentoplaywithyourGSMterminal.Itisnotatoy.Childrencouldhurt

themselvesorothers(bypokingthemselvesorothersintheeyewiththeantenna,forexample).

Childrencoulddamagethemodem,ormakecallsthatincreaseyourmodembills.

BlastingAreas

Toavoidinterferingwithblastingoperations,turnyourunitOFFwhenina«blastingarea»orin

areasposted:«turnofftwo‐wayradio».ConstructioncrewsoftenuseremotecontrolRFdevicesto

setoffexplosives.

PotentiallyExplosiveAtmospheres

TurnyourterminalOFFwheninanyareawithapotentiallyexplosiveatmosphere.Itisrare,but

yourapplicationoritsaccessoriescouldgeneratesparks.Sparksinsuchareascouldcausean

explosionorfireresultinginbodilyinjuriesorevendeath.

Areaswithapotentiallyexplosiveatmosphereareoften,butnotalways,clearlymarked.They

includefuellingareassuchaspetrolstations;belowdecksonboats;fuelorchemicaltransferor

storagefacilities;andareaswheretheaircontainschemicalsorparticles,suchasgrain,dust,or

metalpowders.

Donottransportorstoreflammablegas,liquid,orexplosivesinthecompartmentofyourvehicle

whichcontainsyourterminaloraccessories.

Beforeusingyourterminalinavehiclepoweredbyliquefiedpetroleumgas(suchaspropaneor

butane)ensurethatthevehiclecomplieswiththerelevantfireandsafetyregulationsofthecountry

inwhichthevehicleistobeused.

Sierra Wireless WISMO228 MODULE User Manual USERS MANUAL 1

Sierra Wireless Inc. MODULE USERS MANUAL 1

Contents

USERS MANUAL 1

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