NXP Semiconductors OM12000 GSM/GPRS Module User Manual

NXP Semiconductors GSM/GPRS Module

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NXPBUAUTOMOTIVETELEMATICS

ATOP2.5GProject

Documentation

RafPeeters



OM12000(ATOP)HWuser

manual



InfoContent

Documenttypedocumentation

AuthorRafPeeters

AuthorRoleApplicationHW engineer

KeywordsATOP 2.5G,Teleboxmini

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NXPSemiconductorsOM1200(ATOP)Project

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©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

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NXPSemiconductorsOM1200(ATOP)Project

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©NXPN.V.2010Allrightsreserved3/27

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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

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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.

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NXPSemiconductorsOM1200(ATOP)Project

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©NXPN.V.2010Allrightsreserved4/27

2. Blockdiagram&photos

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NXPSemiconductorsOM1200(ATOP)Project

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©NXPN.V.2010Allrightsreserved5/27

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

NXPSemiconductorsOM1200(ATOP)Project

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©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

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©NXPN.V.2010Allrightsreserved7/27

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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

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©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

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©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

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©NXPN.V.2010Allrightsreserved10/27

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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

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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

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GPS

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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:

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GPIOP3.26InternalLNA/passiveGPSBiassupply/activeGPS

1OFFON

0ONOFF

NXPSemiconductorsOM1200(ATOP)Project

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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

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NFC

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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.

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Remark:fordevelopmentaNXPreferencecoilsdesignisused.

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5. SIMcard

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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)

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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.

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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

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6. Clockmicrocontroller

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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.

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7. USB

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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.

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8. PNXuartbuffer

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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

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9. CANtransceiver

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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

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10. LED’sandbuttons

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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

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NXPSemiconductorsOM1200(ATOP)Project

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©NXPN.V.2010Allrightsreserved19/27

V3.2changes:

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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:

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11. Accelerometer/Eeprom/SSI1serialinterface

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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

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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

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NXPSemiconductorsOM1200(ATOP)Project

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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

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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

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V3.2changes:

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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

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12. Audioconnections

Analogaudioin

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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





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



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



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



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





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.

NXP Semiconductors OM12000 GSM/GPRS Module User Manual

NXP Semiconductors GSM/GPRS Module

User Manual

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