NXP Semiconductors OM12000 GSM/GPRS Module User Manual

NXP Semiconductors GSM/GPRS Module

User Manual

NXPBUAUTOMOTIVETELEMATICSATOP2.5GProjectDocumentationRafPeetersOM12000(ATOP)HWusermanualInfoContentDocumenttypedocumentationAuthorRafPeetersAuthorRoleApplicationHW engineerKeywordsATOP 2.5G,Teleboxmini
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved2/27Summary1.Documentpurpose..................................................................................................3Purpose...................................................................................................................................................3Scope.......................................................................................................................................................3Support...................................................................................................................................................3History.....................................................................................................................................................32.Blockdiagram&photos...........................................................................................43.Powersupply&batterycharger..............................................................................64.RFAntennaconnections........................................................................................10GPRS......................................................................................................................................................10GPS........................................................................................................................................................11NFC........................................................................................................................................................125.SIMcard.................................................................................................................126.Clockmicrocontroller............................................................................................137.USB.........................................................................................................................148.PNXuartbuffer......................................................................................................159.CANtransceiver.....................................................................................................1610.LED’sandbuttons..................................................................................................18Resetswitch..........................................................................................................................................18Ecallbutton...........................................................................................................................................18LED’s......................................................................................................................................................1811.Accelerometer/Eeprom/SSI1serialinterface....................................................2012.Audioconnections.................................................................................................22Analogaudioin.....................................................................................................................................22Analogaudioout...................................................................................................................................2312.1.1Earphone...................................................................................................................2312.1.2Speaker.....................................................................................................................2413.Boardtechnology..................................................................................................2514.CommentsUserManual........................................................................................2715.FCCClassstatement.............................................................................................27
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved3/271. DocumentpurposePurposePurposeofthisdocumentistoprovideanuszermanualforOM12000bydescribingTeleboxMiniHW,whichservesasreferenceHWplatformforNXPSWdevelopmentanddemowithincontextofATOP(OM12000)2.5Gproject.ScopeThisdocumentisintendedforall(HW/SWengineers,customers)whoneeddetailedunderstandingofTeleboxMiniv3.xHWimplementationandschematics.SupportForHWquestions,issueoranyproblem,pleasecontactcustomersupport.HistoryTheTeleboxMinihasalreadysomehistory.Thisnewversion3.xwhichaccommodatesB2ATOPversion,andalsosomemajorchangesareimplementedinthepowersupplycircuitry.SincethisTeleboxMiniaimstobeaprototypeforSWdevelopmentanddemo,therearealotofjumperstuffoptionsfortestpurposewhichcustomersdon’tneedtocopy.Thedefaultstuffoptionisindicatedintheschematicsbyadding“dnp”“donotplace”markersoncomponentsnotstuffedbydefault.MainmechanicaldimensionsofthisdemopcbweredefinedinordertofitinthesmallbluedemoboxGEPRO8023fromELPAC.Asaresultlayoutdesignandcomponentchoicehadsomerestrictiontofulfilthetightpcbarearestriction.
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved4/272. Blockdiagram&photos
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved5/27
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved6/273. Powersupply&batterychargerTheATOPSiPmodulebasicallyhas4powersupplyinputs: V_BATT_SW:suppliesbasebandPNX,frontendGPRSpoweramp,NFCpart,andGPSpart(viaonboardLDO’scontrolledbyPNX) V_BAT_RTC_PNX:suppliesbasebandRTCfunction(ifnotconnectedexternally,internallysupplied/bypassedbyV_BATT) V_BATT_LPC:suppliesmicrocontrollerLPC(viaonboardLDO3V0,defaultON)R67allowsforcurrentmeasurementonLPCdomain V_BATT_RTC:suppliesRTCfunctionofmicrocontrollerLPCTheATOPalsohassomepowersupplyoutputs,generatedbybasebandPMUfunction: V_SIM:SIMcardinterface V_PERM,VREF:forreferenceonly,shouldnotbeexternallyloaded V_IO(2V8):forreferenceonly,shouldnotbeexternallyloaded(suppliesbasebanddigitalinterfaceincludingSSI,GPIO,DAI,JTAGanddebug)PresenceofV_IOcanbedetectedonthemicrocontrollerLPCviaR53onGPIOLPC_uart1_CTSP0.17 VDD_3V0:ThisistheoutputvoltageoftheonboardLDOsupplyingthemicrocontrollerLPC.Thissupplycanbeusedintheapplication,butwithlimitedcurrentloadsincesharedwithmicrocontrollerconsumption.(TheLDO,LDS3985M30,isa3V/300mAoutputcurrentregulator.TheonboardmicrocontrollerLPC2368hasmax125mAatmaximumactivityaccordingdatasheet)
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved7/27Figure1:extractofschematicsTeleboxMiniv3.0:powersupply&batterychargerMainsupplyofthedesignisprovidedbytheLi‐polymerbattery,inthiscasePLF323450fromVartaMicrobattery,typicalcapacity570mAh.(connectorJ5)Sincethisbatterysamplehasnobuilt‐inNTCthermistor,R1510khasbeenaddedtoallowthebasebandPNXchargerfunctiondetectthebatterypresence.SlideswitchJ4allowstotaldisconnectionofthebatteryfromthesystemtoavoidpossiblebatterydrain(ontheshelve)ormanuallyswitchON/OFFthesystembytheuser.CapacitorsC1andC43provideextraenergybuffertocompensate,duringGPRStransmissionslots,possiblebatteryvoltagedropduetoallkindofV_BATTresistance
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved8/27(totalpathfrombatteryuptosupplypinofGPRSfrontendpoweramp)likeconnectionwires,slideswitch,powerpathFET,pcbtraceandinternalbatteryimpedance.Thevalueactuallyimplemented/neededoncustomerboardsdependsonrequirementsandimplementation.ThebatterylevelcanbemeasuredviaresistivedividerR49/R50,connectedtotheADCinputoftheATOPmicrocontrollerLPC.PowerpathcontrollerLTC4412:VSYSisthemainsupplyconnectedtoVBATpinsofATOPmodule.LTC4412controlsthesourceforthisVSYS,2options:‐ battery‐ externalsupply/adaptorWhicheverofthese2inputsupplieshasthehighestlevelwillbeconnectedtoVSYS.TheexternalsupplyVINisattachedtothesystemviaeitherminiUSBconnectororsolderpadPAD1.(stuffoptionviaR157/R159)VBAToftheATOPhasamaximumlimitof4.8V.OtherdevicesontheTeleboxMini(CAN,LPCVBUSandclassD)havealsomaximumlimitson5.5V.Inordertofulfiltheselimitationsomeextracircuitryhasbeenadded:a)DiodesD16andD12createsomevoltagedrop,whichwilldependonthecurrenttoVSYS,onit’sturndependentonapplication.D12canbebypassedbyR24incasethesystemcurrentishighenough.WetargettohaveLTC4412switchedalwaysforVINpath,ifexternalsupplyispresent(forthisweneedforworstcase,meaningwhenfullychargedbattery,minimum4.2VatSENSEpinofLTC4412)b)Comparator/zenerU22willenablethepathVIN_to_VDC_5V(2ndFETofdualFETT3)aslongasVINissmallerthen5.36V,sothatafterdiodevoltagedropVSYSislessthan4.8V.Outputpin1ofU22willpulldownthegateandassuchenablethePFET.InordertobeabletofulfilmaximumallowedcurrentdrainfromUSBhosts(USB_spec:initiallyduringenumerationmax100mA…maximumcurrentnegotiableupto500mA)dualbipolartransistorQ28(internalresistors)andQ29isadded.Thisallows,inTeleboxMiniapplicationswereexternalsupplyisconnectedtoarealUSBhostbuswithcurrentlimitation,andVINR157optionisstuffed,theLPCFWtocontrolandforcethepowerpathcontrollerLTC4412toconnectVSYStobatterysource,
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved9/27incasesystemcurrentisexpectedtoincreaseabovethenegotiatedallowedmaxUSBhostcurrentdrain.ThePNPpartofQ28willshorttheGate_SourceresistorR146ofVIN_to_VDC_5VFETT3_2whentheGPIOLPC_PIPESTAT(1)P2.2ispulledLOW.DefaultafterresetofLPC(input/pullupmodeGPIO)this“disable”functionisOFF,inUSBapplicationsthesystemstartupcurrentshouldbelimitedto100mA…Chargerfunction:TheATOPbasebandPNXhasanintegratedchargerfunctionwhichneedsonlysomeexternalFETSi5935DC,T1(dualFETpackageofwhichoneFETischargeON/OFFcontrolwithbodydiodesuchtoavoidanyreversecurrentwhenOFF,theotherFETisanalogcontrolledforchargecurrentlevelsetting)andseriesresistorR4(100mOhm)tomeasurechargecurrent.Importantremark:‐ makesurethechargecurrentamplitude,programmedinbasebandflashmemory,iscompatiblewithmaximumallowedchargecurrentspecifiedinthedatasheetoftheappliedbattery!‐ InordertoavoidoverheatingthechargerdualFETT1(dissipationof2ndFETisequaltoproduct(deltaVIN–VBAT)*I_chargelimitVINoftheexternalattachedchargeradaptorto5V!(someprecautions(coolingcopperarea)havebeentakentoreducethethermalresistanceRth_jaofT1,butphysicalpcbarealimitationofTeleboxMinilimitscoolingefficiency)RTCbackupfrombattery:InordertokeepRTCofLPCalivewhenmainsupplyisoff(externalsupplydisconnectedandslideswitchJ4inOFFstate)theLPCRTCcircuitrywillbekeptsuppliedbyVBAT_in(=directlyconnectedtobattery)viadual_seriesdiodeD14(D15preventsreversecurrenttoVDD_3V0).Seenextstuffingoption:
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved10/274. RFAntennaconnectionsGPRSOnboardtheATOPmodulethereisanantennaRFswitchinfrontofthepoweramp.TheTeleboxMinioffers2waysforconnectinga50ohmGPRSquad‐bandantenna.GSM_ANT1:SMAjackJ7(SMA19‐70‐4‐TGGMulticomp)RGSM_ANT2:UFLjackJ8(U.FL‐R‐SMTHirose)Thispathismeanttoaccommodatesomeinternalgprsantennainsidetheproducthousingbymeansof50ohmU.FLcableassembly.MicrocontrollerGPIO‘GSM_ANT_SWITCH’P1.0selectseitherofthepaths:GPIOP1.0GSM_ANT1GSM_ANT2
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved11/271OFFON0ONOFFRemark:fordevelopmentthisquadbandGPRSantennaisusedonGSM_ANT1SMA:MC0114015‐FME‐BU‐W,manufacturedMC‐Technologieshttp://www.mc‐technologies.net/en/wireless_modules/antennen‐und‐zubehoer/index.phpGPSTheATOPmodulehasanonboardLNAwhichaccommodatesforapassiveGPSantenna.ThisinputoftheLNAisconnectedtotheU.FLconnectorJ2.ThispathismeanttoaccommodatesomeinternalGPSantennainsideamechanicalprototypehousingbymeansof50ohmU.FLcableassembly.InordertoconnectsomeexternalactiveGPSantenna,connectorJ1accomodatesfora(longer)50ohmSMAcable.Inthisoption,weuseinputGPS_ANT_2whichbypassestheonboardLNA.TheonboardLNAisdisabledbypullingitsinputlowviathenpnpartofQ24(controlledbyGPIOLPC_PWM_1_3P3.26).ThebiassupplyfortheactiveantennaisprovidedviathechargepumpU14MAX1759,configuredforVout=4.3V.SincethereisaPINdiodeinthepathwithdropofabout1V,thisleavesabout3.3Vfortheantennasupply.ToaccommodateforothersupplyrequirementsR102/R40canbechangedaccordingly.GPIOP3.26willexclusivelyactivateeithertheonboardLNAorthechargepumpbiassupplyaccordingfollowingtruthtable:GPIOP3.26InternalLNA/passiveGPSBiassupply/activeGPS1OFFON0ONOFF
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved12/27Remark:fordevelopmentfollowingactiveGPSpatchantennaisused:GAACZ‐A,,5mcable,3‐5V,manufacturedbyActiveRobotsLtd.http://www.active‐robots.co.uk/active‐gps‐antenna‐p‐552.htmlNFCTheATOPmodulehasaNFCreaderfunctiononboard.ConnectorJ3,Molex53261‐0371,accommodatesfortheNFCcoil.StuffoptionC3isforRFtest,fornormaluseitisstuffedwith0ohmjumper.ThecableconnectingtheTeleboxMiniwiththeantennacoilshouldbemaximum10cm.Remark:fordevelopmentaNXPreferencecoilsdesignisused.5. SIMcard
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved13/27ConnectorJ9,CCM03‐MK3fromC&K,accommodatesforSIMcardinsertion.U5,PRTR5V0U4YNXP,providesESDprotection.TheTeleboxMinihasastuffoptiontoaccommodateapcbsolderedSIMchip(U6).(R38/R42allowforpossiblefuturepinchange)InordertoswitchaccessbetweenbothSIMcardoptions,analogmuxU13multiplexestheSIMdatalinesbyGPIOcontrolLPC_tracepkt(1)P2.6.DefaultstuffoptionR48/R47selectsconnectorJ9.R58allowsbypass/i.e.nottostuffthemux.IfR47and/orU6wouldbestuffedfollowingtruthtablewouldhold:GPIOP2.6SIMcardSIMchip1OFFON0ONOFF6. Clockmicrocontroller
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved14/27Thereare2optionsontheTeleboxMinitosourceanexternalclocktothemicrocontrollerLPC.26M_EXTisa26MHzoutputclockfromtheATOPbaseband.BufferU11bufferstheclocksignal,whileR69/R65resistivedividermatchesmaxvoltageswingspecifiedbytheLPC.AnotheroptionforsourcingtheLPCexternalclockisusingthe12MHzcrystalY1withtheLPCowninternalmainoscillator.(requiredforUSBorHSCANfeatureimplementationwithmorestringentclockjitterrequirements)Forthisoption:stuffR147/R148andremoveACcouplingC18.7. USB
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved15/27TheATOPmicrocontrollerLPChasaUSB2.0fullspeeddevicecontrolleronboardwhichcanbeaccessedbymini‐BUSBconnectorJ10.U7providesESDprotectionwithintegratedpi‐typefilter,33ohmseriesresistorsand1k5pullupresistor(connectedtoQ26fordelayeddevicedetectsignallingoption).AlsothisUSBconnectorisusedasbatterychargerinput.Pleaserefertochapter3‘powersupplyandbatterycharger’,regardingstuffoptionsR157/R158/R159andmaximumUSBhostdraincurrentlimitations!ItispossibletowakeupthemicrocontrollerLPCfrompowerdownmodebyeventdetectiononanyGPIOfromport0or2.ToallowwakeupeventfromUSBchargercableinsertdetection,R44connectsLTC4412‘STAT’signaltoGPIOLPC_tracepkt(0)P2.5.WhenUSB_miniBconnectorisusedaschargerinput,STATwillbepulledLOWwhenchargerispresent.8. PNXuartbuffer
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved16/27Inordertoproperlystartupthebaseband,thereshouldnotbeanyparasiticsupplycurrentpresentonthePNXpinsbeforesending“powerON”commandviaLPCSW.SoanyinputcurrentshouldbeavoidedforallPNXIOpins(pcm,analog,…)InordertoavoidRS232transceiveronthePNXuartlinescouldunintentionallysupplycurrent,abufferU9hasbeeninsertedontheTeleboxMinitoallowpropercontrolbythemicrocontrollerLPCviaGPIOLPC_CAP0_1P1.27.GPIOP1.27PNXuart1Enabled0Disabled9. CANtransceiver
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved17/27TheATOPmicrocontrollerLPChas2CANcontrollersonboard(CAN2.0,1Mbit/s).TeleboxMiniaccommodatesoneCANcontrollerwithahighspeedCANtransceiver,U2TJA1042T,withsomecommonmodechokeoptionandESDprotection.TheCANinterfaceisonlyfunctionalwhenVDC_5Visappliedtothesystem(eitherviaUSBorviaexternalpowersupply).Whennotpowered,thetransceiverhasidealpassivebehaviour,notdisturbingeventuallyconnectedCANbus.GPIOLPC_PWM_1_2P3.25cancontrolstandbystatusofthetransceiver.Instandbymodethereispossibilityforremotewake‐upcapabilityviatheCANbus.BesidesCANinterface,the3pJ6Molex53261‐0371connectorcanalsoaccommodateforconnectiontothemicrocontrollerLPCuart0port.ThiswouldallowflashingnewcodetoLPCfromoutsidethebluemechanicalbox(EINT_0,neededtobringLPCinflashmode,isavailableattheilluminatedpushbuttonSW1)StuffoptionJ6connection:‐R13/R14:LPC_uart0‐R17/R25:CAN2
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved18/2710. LED’sandbuttonsResetswitchTactswitchSW2onthesideoftheboardallowsmanualresettingthesystem.EcallbuttonIlluminatedpushbuttonSW1isintendedasmanualinputfromtheusertoinitiateanEcall.GPIOLPC_EINT0P2.10islowwhenthebuttonispushed.Sinceitispartofport2,thisbuttoniscapabletowakeupapowereddownsystem.ThebuttonalsohasanintegratedredLEDtoallowuserinteraction.LED’s1redLEDD4and1green/redLEDD5areavailableforuserinterface.InallcasestheLED’sareONwhentheGPIOissetHIGH(U3/U4arebufferinginvertors)FollowingtableprovidesanoverviewofGPIOconnectionstotheLED’sRedLEDD4GPIOP2.1GreenLEDD5GPIOP1.18RedEcallbuttonLEDGPIOP1.28
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved19/27V3.2changes:RemovedstuffoptionR28/R30forsupplyofLED’s.SinceVsyswillbehigherthen3V,U3andU4arenotabletodisableLEDcurrent…Followingupdatedschematics:
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved20/2711. Accelerometer/Eeprom/SSI1serialinterfaceOnesynchronousserialinterfaceSSI1ofATOPmicrocontrollerLPCisavailableforexternaldevice/userapplication(forinstancetoconnectsomeserialdisplayviathedebugconnectorJ11)OnboardtheTeleboxMinia3DdigitaloutputaccelerometerU10LIS302DL(ST)isstuffedandconnectedwiththisSSI1portaswellasaSPIEEPROMU21M95xxx.Theaccelerometerhas2configurableinterruptoutputlines,thatallowwakeupofapowereddownATOPsystem(evenwhenacceleroitselfinpowerdownmode).INT1GPIOP2.0INT2GPIOP2.3GPIOLPC_tracesyncP2.4selectswhichdevice(CS0orCS1)isconnectedwithSSI1port.TheCSlineismuxedbythe2‐inputORgateU18(invertorU17eitherselectsCS_0orCS_1)GPIOP2.4CS1CS00OFFON1ONOFF
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved21/27ViaresistorsstuffoptionsdifferentcombinationscanbeimplementedforconnectiontoCS0orCS1ofSSI1interfacechipselect:Defaultstuffing:‐ Accelero(CS_acc):CS0‐ Eeprom(CS_mem):CS1‐ Externalviadebugconnector(CS_ext):notconnectedAnotherstuffoption(viaR81/R99)allowsforconnectingtheacceleroinI2Cmode(thiswaymakingSSI1alsoavailablefordebuginterfaceconnectoratthesametime)Default:AcceleroinSPImodeV3.2changes:a)InordertoallowlinkingbasebandBB_PCMaudiooutputwithSSI1channelofthemicrocontroller,aspecialstuffingoptionhasbeenadded.(R162/163/164/165)Sinceinthisusecase,basebandPCMneedstobebusmaster,LPCshouldbeconfiguredasslaveSSI1.InordertoavoidpossibleconflictswiththeotherslaveSSI1peripherals(chipselectsCS0andCS1,SPI_memoryU21CS_memandSPI_acceleroU10CS_acc),bothCSshouldbedisconnectedfromthebus:RemoveR116/R135,stuffR115(memory)RemoveR137/R140,stuffR142(accelero)Alsodon’tuseexternalCS_ext,don’tstuffR145(default)
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved22/2712. AudioconnectionsAnalogaudioinTheATOPbasebandPNXhastwomicrophoneinputports:EXTMIC_BIAS/EXTMIC_IN_P/EXTMIC_IN_N:notconnectedINTMIC_BIAS/INTMIC_IN_P/INTMIC_IN_N:implementedonTeleboxMiniwithnecessarypassivecomponentsandprotectionDefaultstuffoptionprovidesforthedifferentialconnectionmode.ConnectorJ15accomodatesforastandard3.5mmmonoplugelectretmicrophone.Incaseasmallelectretmicrophonewouldbeintegratedinthemechanicalhousing,provisionhasbeenmadeforasmaller2pconnectorJ16Molex53261‐0271.(J16<>3.5mmJ15/J14canonlyexclusivelybestuffed!)Incasehigherbiassupplyisneeded(likeforinstanceautomotiveAKGQ400seriespreamplifiedmousemicrophone),anextraDCDCconvertorisaddedU15MAX1896,defaultconfiguredfor8V.InthiscaseplaceR133andremoveR87(alsoremoveprotectiondiodeD7sinceitwillclipat5V)EnablepinofU15canbeSWcontrolledvia2possibleGPIO’s,P2.2possiblyconflictingwith‘USBforcebatterysupply’,orP1.27possiblyconflictingwithPNX_uartbuffercontrol.ToenabletheDCDC,settheGPIOHIGH.DefaultthisSWcontrolisnotstuffed.Incasevoltageswingoutputofpreamplifiedmicrowouldbetoolarge,resistorsR129/R130couldberesistivedivider.
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved23/27V3.2changes:a)TomakeU15stablewhenloaded,R161/C49arerequired.Followingupdatedschematics:AnalogaudiooutTheATOPbasebandPNXprovidessomeanalogoutputchannels.12.1.1 EarphoneTeleboxMinihasimplementedearphoneoutputchannelEAR_OUTN/EAR_OUTPwithnecessarypassivecomponentsandprotection.Twostuffoptionsareimplemented:‐ audioreferencedtocommonmodeVCM(avoidslargecapacitors,butcouldbeproblemwhenconnectingtoexternaldevicewithinputreferencetoGNDlevel)‐ AC‐coupledoutputs,referenceGND
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved24/27Inthelattercase,someannoyingpoweron‘plop’canbeheared.ThiscanbeavoidedbykeepingtheoutputstoGNDlevelduringpoweron(Q12andQ13aresmallfootprint,andhaveverylowONresistancetominimizeploplevel).Controlofthe‘antiplop’transistorsisdonebybasebandGPIO2_BOOT0(haspullupresistoronATOPmodule)ThecommonmodeoptionshouldbepreferredsincethebodydiodesofQ12/Q13willcreatesomeharmonicdistortionatlargeroutputswing.NeverthelesstheotheroptionisstuffedbydefaulttoavoidpossibleunintentionallyconflictVCM<>GND.ConnectorJ14providesaccommodationforastandard3.5mmstereoplug.12.1.2 SpeakerTheATOPbasebandPNXprovidesoptiontosourcean8ohmspeakerwithmax500mWoutputpower.Forthis:removeR86/R90/R75/R87R78andstuffR79/R80.Ifthispowerlevelisnotsufficientfortheapplication,TeleboxMiniprovideswithanexternalclassDaudioamplifierSA58672fromNXP,whichcouldprovideupto1.7W/8ohmwhensuppliedfromVDC_5V.ClassDfeatureonlyavailablewhenexternalsupplyconnected!TheamplifierenablepincanbeSWcontrolledbyGPIOLPC_tracepkt(3)P2.8,setHIGHtoenable.SpeakerconnectorJ13:2pMolex53261‐0721.
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved25/27V3.2changes:a)Inordertohavespeakeroutputaccessibleonthe3.5mmjackconnectorJ14(=earphoneoutputdefault)somestuffingoptionisadded:R100/R112.Forthisusecasefollowingstuffingshouldbeapplied: RemoveL5/L6/R92/R93 StuffR100/R112Followingupdatedschematics:13. BoardtechnologyTheTeleboxMiniistargetedtobeaHWplatformforSWdevelopmentanddemovehicle.Itisaprototype,notintendedtobemassproductionready.Assuchitisnotadvisedtorunverylargequantitybatches,therewillbeyieldissues.Alsopossiblynotfullyoptimizedforcostandassemblymachinelimitations.Maximumefforthasbeendonetokeeptheoutlinemechanicaldimensionsassmallaspossible,integratingallfeaturesdescribedaboveandstillfittingthebluedemoboxGEPRO8023.EDAtoolbeingusedisORCADschematicCaptureandLayoutv10.5.0.DRC(designrulecheck)globalspacingsettingsaresetat70um.StandardVIAdimensionsusedare(padsize0.4mm/drillhole0.2mm)diameter.Outlinepcbdimensions:65mmx42.8mm(4halve‐circlecut‐outs,formechanicalspacerwith2mmscrews:inlongsideofthepcbathorizontalcoordinatesx=3andx=62andbothy=0and42.8)
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved26/27Pcbthickness:1.2mmNumberoflayers:6:1.top2.gnd3.pwr4.in15.in2(=gnd2)6.botStackbuilduptechnologyused:Regardingtheimpedancecontrolfor50ohmRFantennatraceslocatedonlayer1.top,layer5.in2isusedasreferencegroundinordertokeepRFtracewideenoughtolowerlosses(insteadofusinglayer2.gnd).Allotherlayersinbetweenhavebeenkeptfreeoftracesandcopperaroundthetransmissionlines.Tracewidth:0.9mmGNDclearancecopperfill:0.2mmsumthicknessoflayersbuildup:0.852mmEr=4.4copperthickness18um>>>resultsinabout50ohm:
NXPSemiconductorsOM1200(ATOP)Project©NXPN.V.2010Allrightsreserved27/2714. CommentsUserManualThisdevicecomplieswithpart15oftheFCCRules.Operationissubjecttothefollowingtwoconditions:(1)Thisdevicemaynotcauseharmfulinterference,and(2)thisdevicemustacceptanyinterferencereceived,includinginterferencethatmaycauseundesiredoperation.TheFCCrequirestheusertobenotifiedthatanychangesormodificationsmadetothisdevicethatarenotexpresslyapprovedbyNXPSemicondcutors,couldvoidtheuser'sauthoritytooperatetheequipment15. FCCClassstatementThisequipmenthasbeentestedandfoundtocomplywiththelimitsforaClassBdigitaldevice,pursuanttoPart15oftheFCCRules.Theselimitsaredesignedtoprovidereasonableprotectionagainstharmfulinterferenceinaresidentialinstallation.Thisequipmentgeneratesusesandcanradiateradiofrequencyenergyand,ifnotinstalledandusedinaccordancewiththeinstructions,maycauseharmfulinterferencetoradiocommunications.However,wecannotguaranteethatinterferencewillnotoccurinaparticularinstallation.Ifthisequipmentdoescauseharmfulinterferencetoradioortelevisionreception,whichcanbedeterminedbyturningtheequipmentoffandon,theuserisencouragedtotrytocorrecttheinterferencebyoneormoreofthefollowingmeasures:•Reorientorrelocatethereceivingantenna.•Increasetheseparationbetweentheequipmentandreceiver.•Connecttheequipmentintoanoutletonacircuitdifferentfromthattowhichthereceiverisconnected.•Consultthedealeroranexperiencedradioortelevisiontechnicianforhelp.

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