Ublox AMY-5M Quick setup guide

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your position is our focus
Abstract
Thisdocumentdescribesthehardwarefeaturesandspecificationsofthecosteffective
andhigh-performanceAMY-5MROM-BasedGPSmodulefeaturingtheu-blox5
positioningengine.
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TheAMY-5Mmoduleboaststheindustry’ssmallestformfactorandisafullytested
standalonesolutionthatrequiresnoadditionalcomponentsandnohostintegration.
ThismodulecombinesexceptionalGPSperformancewithhighlyflexiblepower,design,
andserialcommunicationoptions.
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u-blox AG
Zürcherstrasse68
8800Thalwil
Switzerland
www.u-blox.com
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Phone+41447227444
Fax+41447227447
[email protected]
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AMY-5M
u-blox 5 GPS Module
Hardware Integration Manual
(incl. Reference Design)
Manual

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AMY-5M-HardwareIntegrationManual 
GPS.G5-MS5-08207 Page 2
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your position is our focus
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Title AMY-5M
Subtitle HardwareIntegrationManual (incl.ReferenceDesign)
Doc Type ManualObjectiveSpecification
Doc Id GPS.G5-MS5-08207
Revision
Index Date Name Status / Comments
InitialVersion3/12/2008TG
Thisdocumentandtheuseofanyinformationcontainedtherein,issubjecttotheacceptanceoftheu-bloxtermsandconditions.They
canbedownloadedfromwww.u-blox.com.
u-bloxmakesnowarrantiesbasedontheaccuracyorcompletenessofthecontentsofthisdocumentandreservestherighttomake
changestospecificationsandproductdescriptionsatanytimewithoutnotice.
u-bloxreservesallrightstothisdocumentandtheinformationcontainedherein.Reproduction,useordisclosuretothirdpartieswithout
expresspermissionisstrictlyprohibited.Copyright©2008,u-bloxAG.
u-blox®isaregisteredtrademarkofu-bloxHoldingAGintheEUandothercountries.ARM®istheregisteredtrademarkofARMLimitedin
theEUandothercountries.
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Document status
ObjectiveSpecificationThisdatasheetcontainstargetorgoalspecificationforproductdevelopment.
AdvanceInformationThisdatasheetcontainsdatabasedonearlytesting.Valuesmaychange.
Preliminary Thisdatasheetcontainspreliminarydata,revisedandsupplementarydatamaybepublishedlater.
Released Thisdatasheetcontainsthefinalproductspecification.
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Productsmarkedwiththislead-freesymbolontheproductlabelcomplywiththe
"Directive2002/95/ECoftheEuropeanParliamentandtheCouncilontheRestrictionof
UseofcertainHazardousSubstancesinElectricalandElectronicEquipment"(RoHS).
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ThisisanElectrostaticSensitiveDevice(ESD).
Observeprecautionsforhandling.

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AMY-5M-HardwareIntegrationManualObjectiveSpecification
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Preface
u-blox Technical Documentation
Aspartofourcommitmenttocustomersupport,u-bloxmaintainsanextensivevolumeoftechnical
documentationforourproducts.Inadditiontoourproduct-specifictechnicaldatasheets,thefollowingmanuals
areavailabletoassistu-bloxcustomersinproductdesignanddevelopment.
• GPS Compendium:Thisdocument,alsoknownastheGPSbook,providesawealthofinformation
regardinggenericGPSquestionsaboutsystemfunctionalitiesandtechnology.
• Protocol Specification: Messages,configurationandfunctionalitiesoftheu-blox5softwarereleasesare
explainedinthisdocument.
• Hardware Integration Manual:ThisManualprovideshardwaredesigninstructionsandinformationon
howtosetupproductionandfinalproducttests.
How to use this Manual
TheAMY-5MHardwareIntegrationManualprovidesthenecessaryinformationtosuccessfullydesigninand
configuretheseu-blox5poweredGPSreceivermodules.Fornavigatingthisdocumentpleasenotethe
following:
Thismanualhasamodularstructure.Itisnotnecessarytoreaditfromthebeginningtotheend.Tohelpin
findingneededinformation,abriefsectionoverviewisprovidedbelow:
1.Hardware Basics:ThischapterintroducesthebasicsoffunctionandarchitectureoftheAMY5modules.
2.Design In:ThischapterprovidestheDesign-Ininformationnecessaryforasuccessfuldesign.
3.Product Handling:Thischapterdefinespackaging,handling,shipment,storageandsoldering.
4.Product Testing:ThischapterprovidesinformationabouttestingofOEMreceiversinproduction.
5.Appendix: TheAppendixincludesguidelinesonhowtosuccessfullymigratetou-blox5designs,anduseful
informationaboutthedifferentantennatypesavailableonthemarketandhowtoreduceinterferencein
yourGPSdesign.
Thefollowingsymbolsareusedtohighlightimportantinformationwithinthemanual:
Anindexfingerpointsoutkeyinformationpertainingtomoduleintegrationandperformance.
A warning symbol indicates actions that could negatively impact or damage the module.
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Questions
Ifyouhaveanyquestionsaboutu-blox5HardwareIntegration,please:
• Readthismanualcarefully.
• Contactourinformationserviceonthehomepagehttp://www.u-blox.com
• ReadthequestionsandanswersonourFAQdatabaseonthehomepage3http://www.u-blox.com
Technical Support
Worldwide Web
Ourwebsite(5www.u-blox.com)isarichpoolofinformation.Productinformation,technicaldocumentsand
helpfulFAQcanbeaccessed24haday.

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AMY-5M-HardwareIntegrationManualObjectiveSpecification
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GPS.G5-MS5-08207u-bloxproprietaryPage 4
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your position is our focus
By E-mail
Ifyouhavetechnicalproblemsorcannotfindtherequiredinformationintheprovideddocuments,contactthe
nearestoftheTechnicalSupportofficesbyemail.Useourservicepoolemailaddressesratherthananypersonal
emailaddressofourstaff.Thismakessurethatyourrequestisprocessedassoonaspossible.Youwillfindthe
contactdetailsattheendofthedocument.
Helpful Information when Contacting Technical Support
WhencontactingTechnicalSupportpleasehavethefollowinginformationready:
• Receivertype(e.g.AMY-5M)andfirmwareversion(e.g.V5.00)
• Receiverconfiguration
• Cleardescriptionofyourquestionortheproblemtogetherwithau-centerlogfile
• Ashortdescriptionoftheapplication
• Yourcompletecontactdetails

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AMY-5M-HardwareIntegrationManualObjectiveSpecificationContents
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Contents
Preface ............................................................................................................................................................ 3
Contents..............................................................................................................................5
1Hardware Description ..................................................................................................8
1.1 FunctionalOverview ............................................................................................................................. 8
1.2 ModuleFeatures................................................................................................................................... 8
1.3 Architecture.......................................................................................................................................... 9
2Design-In.....................................................................................................................10
2.1 PowerManagement ........................................................................................................................... 10
2.1.1 Overview..................................................................................................................................... 10
2.1.2 PowerManagementConfiguration ............................................................................................. 12
2.1.3 SystemPowerConsumption........................................................................................................ 12
2.1.4 HowtoconnectthePowerSupplyPins ....................................................................................... 13
2.1.5 Single2.5…3.6VSupply............................................................................................................. 13
2.1.6 Single1.75…2.0VSupply........................................................................................................... 14
2.1.7 SeparateSuppliesof1.8V(1.75…2.0V)and1.4V(1.4…3.6V).................................................. 15
2.1.8 SeparateSuppliesof3.0V(2.5…3.60V)and1.4V(1.4…3.6V)................................................. 16
2.1.9 PowerModes .............................................................................................................................. 16
2.1.10 ActiveAntennaSupply ................................................................................................................ 17
2.2 SystemFunctions................................................................................................................................ 18
2.2.1 EXTINT-ExternalInterruptPin..................................................................................................... 18
2.2.2 SystemMonitoring ......................................................................................................................18
2.3 Interfaces............................................................................................................................................ 18
2.3.1 Serial ........................................................................................................................................... 18
2.3.2 USB ............................................................................................................................................. 18
2.3.3 DisplayDataChannel(DDC) ........................................................................................................ 19
2.3.4 SynchronousPeripheralInterface(SPI) ......................................................................................... 20
2.4 I/OPins ............................................................................................................................................... 20
2.4.1 PeripheralInputOutput(PIO)....................................................................................................... 20
2.4.2 ConfigurationPins....................................................................................................................... 20
2.4.3 SAFEBOOT_N .............................................................................................................................. 23
2.4.4 RTC ............................................................................................................................................. 23
2.5 IncreasingJammingImmunity............................................................................................................. 23
2.6 Design-InChecklist ............................................................................................................................. 23

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AMY-5M-HardwareIntegrationManualObjectiveSpecificationContents
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2.6.1 SchematicDesign-InChecklistforu-blox5 .................................................................................. 23
2.6.2 AMY-5MDesign ......................................................................................................................... 24
2.6.3 DesignforAMY-5M .................................................................................................................... 25
2.7 LayoutDesign-InChecklist.................................................................................................................. 27
2.8 Layout ................................................................................................................................................ 28
2.8.1 Footprint ..................................................................................................................................... 28
2.8.2 PasteMask.................................................................................................................................. 28
2.8.3 Placement ................................................................................................................................... 29
ESDProtectionMeasures............................................................................................................................... 30
2.9.1 ESDPrecautionsforUSB.............................................................................................................. 30
2.9.2 ESDPrecautionsforAntennas ..................................................................................................... 30
3Product Handling........................................................................................................31
3.1 Packaging........................................................................................................................................... 31
3.1.1 Reels ........................................................................................................................................... 31
3.1.2 Tapes .......................................................................................................................................... 32
3.2 Shipment,StorageandHandling ........................................................................................................ 32
3.2.1 Handling ..................................................................................................................................... 32
3.2.2 Shipment..................................................................................................................................... 32
3.2.3 Storage ....................................................................................................................................... 33
3.2.4 Handling ..................................................................................................................................... 33
3.2.5 FloorLife ..................................................................................................................................... 34
3.3 Processing .......................................................................................................................................... 35
3.3.1 MoisturePreconditioning ............................................................................................................ 35
3.3.2 SolderingPaste............................................................................................................................ 35
3.3.3 ReflowSoldering ......................................................................................................................... 36
3.3.4 OpticalInspection........................................................................................................................ 37
3.3.5 Cleaning...................................................................................................................................... 38
3.3.6 RepeatedReflowSoldering.......................................................................................................... 38
3.3.7 WaveSoldering ........................................................................................................................... 38
3.3.8 HandSoldering ........................................................................................................................... 38
3.3.9 Rework........................................................................................................................................ 38
3.3.10 ConformalCoating ..................................................................................................................... 39
3.3.11 Casting........................................................................................................................................ 39
3.3.12 GroundingMetalCovers ............................................................................................................. 39
3.3.13 UseofUltrasonicProcesses.......................................................................................................... 39
3.4 ESDHandlingPrecautions................................................................................................................... 40

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AMY-5M-HardwareIntegrationManualObjectiveSpecificationContents
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4Product Testing...........................................................................................................41
4.1 TestParametersforOEMManufacturer.............................................................................................. 41
4.2 SystemSensitivityTest ........................................................................................................................ 41
4.2.1 GuidelinesforSensitivityTests..................................................................................................... 41
4.2.2 ‘Go/Nogo’testsforintegrateddevices........................................................................................ 42
Appendix ..........................................................................................................................43
AReference Design........................................................................................................43
A.1 MinimumBillofMaterial .................................................................................................................... 43
A.1.1 Schematic.................................................................................................................................... 44
A.1.2 BillofMaterial............................................................................................................................. 45
A.1.3 Layout ......................................................................................................................................... 45
A.2 LEA-5SmartAntenna .........................................................................................................................46
A.2.1 Schematic.................................................................................................................................... 47
A.2.2 BillofMaterial............................................................................................................................. 48
A.2.3 Layout ......................................................................................................................................... 49
BComponent Selection.................................................................................................50
B.1 RTCCrystal(Y2).................................................................................................................................. 50
B.2 I2CSerialEEPROMMemory................................................................................................................ 50
B.3 USBLineProtection(D2)..................................................................................................................... 50
B.4 USBLDO(U3) ..................................................................................................................................... 51
B.5 DualOpen-DrainBuffer(U32)............................................................................................................. 51
B.6 AntennaSupervisorSwitchTransistor(T31) ........................................................................................ 51
B.7 StandardCapacitors ........................................................................................................................... 51
B.8 StandardResistors .............................................................................................................................. 51
CGlossary ......................................................................................................................53
Related Documents ..........................................................................................................53
Contact..............................................................................................................................205H54

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AMY-5M-HardwareIntegrationManualObjectiveSpecificationHardwareDescription
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1 Hardware Description
1.1 Functional Overview
TheAMY-5MistheGPSindustry’ssmalleststandalonereceiver.ItisafullytestedROM-basedsolutionthat
featuresthehighperformanceu-blox5positioningengine.TheAMY-5Mhasbeendevelopedforeasydesign
andintegration,requiresnohostintegration,whichenablesextremelyshorttimestomarket.
TheAMY-5Moffersfourdifferentserialinterfaces.Thereceiverfeaturesu-bloxSuperSense®IndoorGPS-and
usesastandardCrystal,whichprovidesveryfastacquisitionandtrackingperformanceataneconomicalprice.
Furthermore,2-layerPCBintegrationissupported,whichbringsadditionalcostsavings.
AMY-5M’sminiaturesizemeansthatitcanbeintegratedintothesmallestportabledevices.Advancedjamming
suppressionmechanismsandinnovativeRFarchitectureensuremaximumperformanceeveninhostilesignal
environments.
TheAMY-5Misnotdesignedforlifesavingorsupportingdevicesorforaviationandshouldnotbeusedin
productsthatcouldinanywaynegativelyimpactthesecurityorhealthoftheuserorthirdpartiesorthatcould
causedamagetogoods.
1.2 Module Features
Voltage Range (V)
Thickness (mm)
50-channel
engine
KickStart
SuperSense
FW Update
/ FLASH
Low Power
Modes
UART
USB
SPI
DDC
AssistNow
Online
AssistNow
Offline
Dead Reckoning
Raw Data
Precision Timing
1PPS
CFG Pins
Reset Input
Antenna
Supply
Antenna
Supervisor
AMY-5M 1.75-2.0
2.5-3.6
1.2
  P 1 1 1 1    9  E
P=PlannedE=Dependsonexternalcircuitry
Table 1: Features of the AMY-5M

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AMY-5M-HardwareIntegrationManualObjectiveSpecificationHardwareDescription
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1.3 Architecture
TheAMY-5Mmoduleconsistsoftwofunctionalparts-theRFandtheBasebandsections.SeeFigure1fora
blockdiagramoftheAMY-5M.
TheRFFront-Endincludestheinputmatchingelements,theintegratedLowNoiseAmplifier(LNA),theSAW
bandpassfilter,theu-blox5RF-ICandtheCrystal.
TheBasebandsectioncontainstheu-blox5Basebandprocessor.TheRTCcrystalandadditionalelementssuchas
theoptionalFLASHmemoryforenhancedprogrammabilityandflexibilityareoptional
RF Front-End Baseband
DigitalIFFilter
SRAM
ROMCode
ARM7TDMI-S
®
GPS/GALILEO
Engine
Power MGM
RTC
BackupRAM
Interfaces
RTC
(optional)
GPIO
UART
USB
V2.0
SPI
DDC
(I
2
Ccompatible.)
Crystal
F
RFFront-End
Integrated LNA
Fractional
NSynthesizer
MainPower
RF
Input
Matching
Activeor
passive
antenna
SAWFilter
BackupBattery
AMY-5M
Available
Interfaces

Figure 1:AMY-5M Hardware Block Schematic


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2 Design-In
InordertoobtaingoodperformancewithaGPSreceivermodule,thereareanumberofpointsthatrequire
carefulattentionduringthedesign-in.Theseinclude:
• PowerSupply
Goodperformancerequiresacleanandstablepowersupply.
• Interfaces
Ensurecorrectwiring,rateandmessagesetuponthemoduleandyourhostsystem.
• Antennainterface
Foroptimalperformanceseekshortrouting,matchedimpedanceandnostubs.
2.1 Power Management
2.1.1 Overview
The power supply circuitry can be adapted to various concepts, depending on the intended application.
Figure2givesanoverviewofthepowersupplyfeatures.
AMY-5
VDD_B NC
VDD_IO VDD_IO 1.65...3.6 V
XTAL_IN
XTAL_OUT
V_DCDC
1.4...3.6 V
Main Battery
1.4...3.6 V
Backup Battery V_BCKP
VDD_ANA NC
VDD_LNA NC
V_TH
V_TH=0: V_DCDC=2.5V - 3.6V
V_THopen: V_DCDC=1.75V - 2.0V
VDD_C NC
Crystal
C20
f
XTAL
= 32.768 kHz
Y2
C19
(optional)
VDD_3V
VDD_RF
V_RESET
V_RESET must be high to run the receiver.

Figure 2: Power Supply Diagram
2.1.1.1 Main Supply Voltage
Inoperationthebase-bandsupplycurrentissuppliedthroughpinV_DCDC.Thebuilt-inLDOgeneratesfrom
thatinputvoltagethestabilizedcorevoltageVDD_C.ThecurrentatV_DCDCdependsheavilyonthecurrent
systemstateandisingeneralverydynamic.
Itisstronglyrecommendedtousealow-impedancesupply(<<1Ohm)totheV_DCDCpin.

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2.1.1.2 Base-Band I/O Supply Voltage
Ingeneral,thedigitalI/Osofthebase-bandpartaresuppliedwithVDD_IOfromthehostsystem.Thewide
rangeofVDD_IOallowsseamlessinterfacingtostandardlogicvoltagelevels.VDD_IOmustbesuppliedinany
casewithavoltageinthespecifiedrange,assomeCFG_xxpinsarealwaysreadduringsystembootinorderto
definetheinitialconfigurationofthereceiver.
ThepowermanagementunitdoesnotsuperviseVDD_IO.ExternalcircuitrymustguaranteethatVDD_IO
iswithinoperatingspecificationbeforethesystembootsandthatitremainswithinspecificationuntil
thesystemshutsdown.Seealsosection2.1.1.6.
2.1.1.3 Base-Band Core Voltages
ThecorevoltagesVDD_BandVDD_Ccorearegeneratedseparately,inordertoenablemainsupplyVDD_C
switchoffwhiletheback-updomainVDD_Bremainsalive.Thecorevoltagesaregeneratedbymeansofinternal
LDOs.TheinputvoltagerangeoftheLDOsiswideandallowstheuseofseveraltypesofbatteries.
2.1.1.4 Backup Power Supply
AbackupbatterycanbeconnectedtosupplytheRTCandthebackupRAMincaseofpowerfailureatthemain
battery(VDD_IO).AninternalswitchwillsupplytheinternalVDD_BpowerdomainincaseVDD_IOdropsbelow
thespecifiedminimumvalue.VDD_IOwillsupplytheVDD_Bpowerdomainifasufficientlyhighinputvoltageis
detected.Seealsosection2.1.1.6.
ItisrecommendedtolimitV_BCKPandVDD_IOto3.6V.
2.1.1.5 RF Supply Voltages
ThemainsupplyoftheRFunitis1.8VsuppliedtotheVDD_RFpin.Optionally,thisvoltagecanbegenerated
withtheinternalLDOfromtheVDD_3Vinput.Dependingontheapplication,theVDD_3Vpincanbesupplied
independently,oritcanbeconnectedtotheV_DCDC.
VDD_RFmustbeacleansupplytoobtainoptimalperformance.SincetheV_DCDCcurrentisverydynamic,a
filterisrecommendedtoensurelittleornorippleonVDD_RF.
2.1.1.6 Built-In Supply Voltage Monitors
Built-insupplyvoltagemonitorsensurethatthesystemalwaysoperatesinsaferegions.Thefollowingconditions
needtobemetinorderthesystemtorunproperly:
1.ThecorevoltagesVDD_CandVDD_Bneedtobewithinspecification.Thesevoltagesaresupervisedby
internalsupplymonitors(signalsPOR_CandPOR_BinFigure2)
2.TheRFsupplyvoltageVDD_RFneedstobewithinspecification.
3.IFexternalmemory(FLASH/EEPROM)isused,itssupplyvoltage,i.e.VDD_IO,needstobewithinthe
specificationofthispart
Withrespecttopoints2and3listedabove,thevoltagethatdefinesthelowestoperationalboundarycondition
ofthesystemshallbesupervisedattheV_RESETpin.ThisisusuallyeithertheTCXOsupplyvoltage(VDD_3V)or
theRFICsupplyvoltage(VDD_RF).IndesignsusingFLASH/EEPROMmemoryitmayalsobeVDD_IO.Normally,
highersystemsupplyvoltagestakelongertoriseandfallfasterthanlowersupplyvoltages.E.g.ifinagiven
application,theRFsectionrequires1.8VbutexternalFLASHmemoryrequires2.7V,itisadvisabletomonitor
VDD_IOratherthanVDD_RF.
ThethresholdatV_RESETforreleasingtheMR_NmasterresetsignalcanbeconfiguredusingtheV_THpin.It
canbesettoeither2.5Vor1.8V.IfV_THisopen,thethresholdissetto1.8V,ifthispinisconnectedtoGND
thethresholdisat2.5V.
Internally,VDD_BandVDD_Caresupervisedbypower-onresetcircuits.Resetsignalsonbackupandcore
domainsPOR_BandPOR_Careonlyreleasedoncetherespectivesupplyvoltagesfallwithintheoperational
conditions.

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Anadditionalmonitorswitchesthesupplyoftheback-upregionVDD_BfromVDD_IOtoV_BCKP,onceVDD_IO
fallsbelowitsoperationalspecification.Thus,aseparatesupplysourcecanbeusedtomaintainRTCandbackup
RAMinformationevenifVDD_IOfails.Ifthisfeatureisnotneeded,V_BCKPmustbeconnectedtoeither
VDCDCorGND.
2.1.1.7 USB Interface Power Supply
VDD_USBsuppliestheI/OsoftheUSBinterface.IftheUSBinterfaceisnotused,theVDD_USBpinmustbe
connectedtoGND.
IftheapplicationusesUSB,thecorrectUSBpowermodeneedstobeconfigured(bus-poweredorself
powered).Seetheu-blox 5 Protocol Specification[3].
2.1.2 Power Management Configuration
Dependingontheapplication,thepowersupplyschematicwilldiffer.Someexamplesareshowninthe
followingsections:
• Supplyvoltagenominal3.3V(2.5–3.6V)seesection2.1.5
• Supplyvoltagenominal1.8V(1.75–2.0V)seesection2.1.6
• Directsupplyofcorevoltages(VDD_RF,VDD_3V1.8V,V_DCDC1.4V) seesection2.1.7
• Dualpowersupplyusing3.0Vand1.4V(VDD_3V3.0V,V_DCDC1.4V)seesection2.1.8
2.1.3 System Power Consumption
Table2comparestheapproximatepowerconsumptionforthedifferentscenarios.Itdifferentiates2cases.One
isacquisitionwhereaworst-casesupplycurrentisassumedforthebase-band-IC.Theothercaseiscontinuous
trackingwhereasteadystatecurrentisassumedforthebase-band-IC.Thetwocasesallowassessingthe
dimensioningofpeakpowerandcontinuouspowercapabilitiesofthepowersupplycircuit.

  RF 1.8 V
BB 1.4 V Single 1.8V Single 3.3V
RFFrontendpowerconsumptionRF-IC[mW]343463
Basebandpowercons.whiletrackingBB-ICTrk.[mW]324176
Basebandpowercons.whileacquisitionBB-ICAcq.[mW]116149274
TotalpowerconsumptionwhiletrackingTotalPwr.Trk.[mW]6676139
TotalpowerconsumptionwhileacquisitionTotalPwr.Acq[mW]150184337
TotalcurrentconsumptionwhiletrackingTotalCurrentTrk.[mA]424242
TotalcurrentconsumptionwhileacquisitionTotalCurrentAcq.[mA]102102102
Table 2: u-blox 5 Power Consumption for different Supply Voltages
ThetotalcurrentdrawnfromthemainbatteryisprovidedinTable2.Asexpected,thisvalueonlychangesifan
externalDC/DCconverterisused.FortheDC/DCconverter,anefficiencyof80%hasbeenassumedin
calculatingthepowervaluesshowninTable2.Fromthistableitcanbeconcludedthat1.4Vand1.8Vsupply
providestheoptimumsolutionintermsofpowerefficiency.Thecorrespondingapplicationcircuitisshownin
section2.1.7.Incasedistinct1.4Vand1.8Vsupplyvoltagesarenotavailableinthesystem,thesingle1.8V
supplyprovidesthebesttrade-offbetweencircuitcomplexityandpowerefficiency.Thisscenarioisdescribedin
section2.1.6.
Atsingle3.3VsupplyvoltagetheuseofaDC/DCconvertermayincreasepowerefficiencyonlymarginally,i.e.
byabout22%forcontinuoustrackingoperation.Theoptimumpower-efficiencyisachievediftheDC/DC
converterisonlyusedtogeneratethe1.4VcorevoltageandtheRF-ICsupplyvoltageisgeneratedusingthe
built-inLDO.Ifpower-efficiencyiskeyfortheapplication,useofanultra-highefficiencyexternalDC/DC
convertersuchasLinearTechnology’sLTC3410isrecommend.Thisparticulardevicealsoreducesthefootprint
neededfortheDC/DCconverterbyintegratingallactivecomponentsintoa2.8×18mm2package.Insection

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2.1.7and2.1.8theapplicablepower-supplycircuitryforthebaseband-ICisshownforthecaseifnoDC/DC
converterisused.Forsupplyvoltageshigherthan3.6V,theuseofanexternalregulator,preferablyaDC/DC
converter,ismandatory.ButagainitisobviousfromTable2,thatthissolutiondoesnotprovidetheutmost
power-efficiency.
2.1.4 How to connect the Power Supply Pins
Table3liststhepowersupplypinsandtheirrequirements.

Pin Function Comments
V_DCDCMainCoreSupplyAlwaysneedsinput.Thecurrentconsumptionvariesovertime(peakcurrents).
Keepseriesresistorlowtopreventrippleonthepowersupply.
VDD_3VMainRFSupplyAlwaysneedsinput.
VDD_IOI/ORingSupplyAlwaysneedsanexternalsupply
V_BCKPBackupvoltagesupplyConnecttoGNDifnotused
VDD_BBackupPowerNotconnectedunlessusingsupplycapacitors.
VDD_CCorePowerNotconnectedunlessusingsupplycapacitors.
VDD_RFCorePowerNotconnectedunlessusingsupplycapacitors.
VDD_ANAAnalogPowerNotconnectedunlessusingsupplycapacitors.
VDD_LNALNAPowerSupplyNotconnectedunlessusingsupplycapacitors.
Table 3: Power Supply Pins
2.1.5 Single 2.5…3.6 V Supply
Asingle3.0Vpowersupplyisveryeasytodesignbutisnotthemosteconomicsolutiontorunu-blox5receivers
(seesection2.1.3fordetails).
AMY-5
XTAL_IN
XTAL_OUT
V_DCDC
2.5...3.6 V
Main Battery
1.4...3.6 V
Backup Battery
V_BCKP
Crystal
C20
f
XTAL
= 32.768 kHz
Y2
C19
(optional)
V_TH
Connect
to GND
Connect
XTAL_IN
to GND
if no RTC used
VDD_3V
VDD_RF
When connecting
to V_DCDC
a filter is imperative
VDD_B
VDD_C
VDD_ANA
VDD_LNA
VDD_IO 1.65...3.6 V
V_RESET

Figure 3: Single 2.5…3.6 V Supply

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2.1.6 Single 1.75…2.0 V Supply
Thesingle1.8Vpowersupplyaveryefficientconfigurationtorunu-blox5receivers(seesection2.1.3for
details).Assureminimalserialresistanceinthepowersupplyasthecurrentconsumptionduringoperationvaries
significantlyovertime.
AMY-5
VDD_B
VDD_IO 1.65...3.6 V
XTAL_IN
XTAL_OUT
V_DCDC
1.75...2.0 V
Main Battery
1.4...3.6 V
Backup Battery
V_BCKP
VDD_ANA
VDD_LNA
VDD_C
V_TH
leave
V_TH
open
Crystal
C20
f
XTAL
= 32.768 kHz
Y2
C19
(optional)
VDD_3V
VDD_RF
When connecting to V_DCDC
a filter is imperative
1.8V
Connect
XTAL_IN
to GND
if no RTC used
V_RESET
Figure 4: Single 1.75…2.0 V Supply
2.1.6.1 RF Supply Voltage
Withasingle1.8Vsupply,VDD_3VmustbeshortedwiththeVDD_RFpin,sothattheinternalLDOisshorted
andthereisnovoltagedrop.TheotherLDOsintheRFunitprovideimprovedsupplyrejectionatverylow
dropoutvoltageandarealwaysrequired.

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2.1.7 Separate Supplies of 1.8 V (1.75…2.0V) and 1.4 V (1.4…3.6 V)
Thedual1.8Vand1.4Vpowersupplythemostefficientconfigurationtorunu-blox5receivers(seesection
2.1.3fordetails).Itassuresabetterstabilitythanasingle1.8VpowersupplyasthesensitiveRFsupplyiswell
separatedfromthefluctuatingbasebandpowersupply.
AMY-5
VDD_IO VDD_IO 1.65...3.6 V
XTAL_IN
XTAL_OUT
V_DCDC
1.4...3.6 V
1.4V Supply
1.4...3.6 V
Backup Battery V_BCKP
VDD_ANA
VDD_LNA
VDD_C
V_TH
Crystal
C20
f
XTAL
= 32.768 kHz
Y2
C19
VDD_3V
1.75...2.0 V
1.8V Supply
VDD_RF
VDD_B
(optional)
V_RESET
Connect
XTAL_IN
to GND
if no RTC used
leave
V_TH
open

Figure 5: Separate Supplies of 1.8 V and 1.4 V

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2.1.8 Separate Supplies of 3.0 V (2.5…3.6 0V) and 1.4 V (1.4…3.6 V)
Thedual3.0Vand1.4Vpowersupplythemostefficientconfigurationtorunu-blox5receivers(seesection
2.1.3fordetails).Itassuresabetterstabilitythanasingle3.0VpowersupplyasthesensitiveRFsupplyiswell
separatedfromthefluctuatingbasebandpowersupply.
AMY-5
VDD_IO VDD_IO 1.65...3.6 V
XTAL_IN
XTAL_OUT
V_DCDC
1.4...3.6 V
1.4V Supply
1.4...3.6 V
Backup Battery V_BCKP
VDD_ANA
VDD_LNA
VDD_C
V_TH
Crystal
C20
f
XTAL
= 32.768 kHz
Y2
C19
VDD_3V
2.5...3.6 V
3.0V Supply
VDD_RF
VDD_B
(optional)
V_RESET
Connect
XTAL_IN
to GND
if no RTC used
Connect
to GND

Figure 6: Dual Supplies of 3.0 V and 1.4 V
2.1.9 Power Modes
u-blox5technologyofferspoweroptimizedarchitecturewithbuilt-inautonomouspowersavingfunctionsthat
minimizepowerconsumptionatanygiventime.
u-blox5canbeoperatedintwodifferentpowermodes:MaximumPerformanceandEcoMode.Inbothcases,
thereceiverisoperatedincontinuousmode.Thedifferenceliesinhowtheacquisitionengineisused.Maximum
PerformanceModefreelyusestheacquisitionengine,resultinginthebestpossibleTTFFatweaksignals.With
EcoModetheuseoftheacquisitionengineisoptimizedtodeliverlowercurrentconsumption.PIO21selects
betweenthesetwomodes.
FurtherLowPowerModestoreducepowerconsumptionduringoperationareplanned.
Formoreinformation,seetheu-blox 5 Protocol Specification[3].

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2.1.10 Active Antenna Supply
WithAMY-5Mmodulesactiveantennasaresuppliedviaanexternalcoilorcircuit.AMY-5Mmodulesdonot
providetheantennabiasvoltageforactiveantennasontheRF_INpin.Itisthereforenecessarytoprovidethis
voltageoutsidethemoduleviaaninductorasindicatedinFigure7.u-bloxrecommendsusinganinductorfrom
Coilcraft(0402CS-36NX).Alternativepartscanbeusediftheinductor’sresonantfrequencymatchestheGPS
frequencyof1575.4MHz.

Low Noise Amplifier
Active Antenna
RF_IN
VDD_3V
36nor 27n
100n
C
1
L
1
C
2
10 Ω

Figure 7: Recommended wiring for active antennas
ForCandLvaluesseeComponentSelectionSectionB.
• Foroptimalperformance,itisimportanttoplacetheinductorasclosetothemicrostripaspossible.Figure8
illustratestherecommendedlayoutandhowitshouldnotbedone.
Microstrip
RF _IN
Antenna Supply Voltage
(e.g. VDD_3V)
Inductor L
Antenna Supply Voltage
(e.g. VDD_3V)
Inductor L
Microstrip
Good Bad
RF _IN

Figure 8: Recommended layout for connecting the antenna bias voltage for AMY-5M

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2.2 System Functions
2.2.1 EXTINT - External Interrupt Pin
EXTINT0isanexternalinterruptpin.ItwillbeusedinfutureAMY-5Mreleasesforwake-upfunctionsinlow-
powermodes.
2.2.2 System Monitoring
Theu-blox-5GPSReceiverprovidesSystemMonitoringfunctionsthatallowtheoperationoftheembedded
processorandassociatedperipheralstobesupervised.TheseSystemMonitoringfunctionsarebeingoutputas
partoftheUBXprotocol,class‘MON’.
Pleaserefertotheu-blox 5Protocol Specification [3]. FormoreinformationonUBXmessages,serialinterfaces
fordesignanalysisandindividualsystemmonitoringfunctions.
2.3 Interfaces
2.3.1 Serial
UART1(RxD1/TxD1)isthedefaultserialinterface.Itsupportsdataratesfrom4.8kBit/sto115kBit/s.An
interfacebasedonRS232standardlevels(+/-12V)canberealizedusinglevelshifterssuchasMaximMAX3232.
TheTxD1outputlevelsaredependantonVDD_IO.(seeAMY-5M Data Sheet[2]).TheRxD1hasfixed
inputvoltagethresholds,whichdonotdependonVDD_IO(seeAMY-5M Data Sheet[2]).
ForthedefaultsettingsseetheAMY-5M Data Sheet[2].
Hardwarehandshakesignalsandsynchronousoperationarenotsupported.
2.3.2 USB
Theu-blox5USBinterfacesupportsthefull-speeddatarateof12Mbit/s.
2.3.2.1 USB external components
TheUSBinterfacerequiressomeexternalcomponentsinordertoimplementthephysicalcharacteristicsrequired
bytheUSB2.0specification.TheseexternalcomponentsareshowninFigure9andlistedinTable4.
InordertocomplywithUSBspecifications,VBUSmustbeconnectedthroughanLDO(U1)topinVDD_USBof
themodule.
IftheUSBdeviceisself-powereditispossiblethatthepowersupply(V_DCDC)isshutdownandthe
Baseband-ICcoreisnotpowered.SinceVBUSisstillavailable,itstillwouldbesignaledtotheUSBhostthatthe
deviceispresentandreadytocommunicate.ThisisnotdesiredandthustheLDO(U1)shouldbedisabledusing
theenablesignal(EN)oftheVDD_USB-LDOortheoutputofavoltagesupervisor.Dependingonthe
characteristicsoftheLDO(U1)itisrecommendedtoaddapull-downresistor(R11)atitsoutputtoensure
VDD_USBisnotfloatingifLDO(U1)isdisabledortheUSBcableisnotconnectedi.e.VBUSisnotsupplied.If
thedeviceisbus-powered,LDO(U1)doesnotneedanenablecontrol.
Allu-blox5receiversbasedonROM5.00andabovesupportbothBusandSelfPoweredModeontheUSB
interface.Pleasebesuretousethelatestdriversfromourwebsite.
ConnectVDD_USBtoGNDifnotused.

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AMY-5
V_DCDC
1.4...3.6 V
Backup Battery
V_BCKP
V_TH
Connect to GND
because VDD_USB LDO
supplies 3.3V to V_DCDC
VDD_USB
USB_DP
USB_DM
LDO
VDD_USB
R4
R5
C24 C23
D2
VBUS
DP
DM
GND
USB Device
Connector
U1
EN R11
EN
VDD_3V
VDD_RF
V_RESET

Figure 9: USB Interface (Bus Powered Setup)
Name Component Function Comments
U1LDORegulatesVBUS(4.4…5.25V)
downtoavoltageof3.3V).
Almostnocurrentrequirement(~1mA)iftheGPSreceiverisoperatedasa
USBself-powereddevice,butifbus-poweredLDO(U1)mustbeabletodeliver
themaximumcurrentof~150mA.Alow-costDC/DCconvertersuchas
LTC3410fromLinearTechnologymaybeusedasanalternative.
C23,
C24
Capacitors RequiredaccordingtothespecificationofLDOU1
D2Protection
diodes
Protectcircuitfromovervoltage
/ESDwhenconnecting.UselowcapacitanceESDprotectionsuchasSTMicroelectronicsUSBLC6-2.
R4,R5Serial
termination
resistors
Establishafull-speeddriver
impedanceof28…44Ohms
Avalueof27Ohmsisrecommended.
R11ResistorEnsuresapulldownwhenLDO
isdisabled.
10kRisrecommendedforUSBself-poweredsetup.Forbus-poweredsetup
R11canbeignored.
Table 4: Summary of USB external components
2.3.3 Display Data Channel (DDC)
TheAMY-5MincludesanI2CcompliantDDCinterface.
FormoreinformationrefertotheDisplay Data Channel (DDC) Application Note[4].
MasterModeisonlysupportedwhenexternalEEPROMisusedtostoreconfiguration.Noothernodes
areconnectedtothebus.
TheDDCinterfacesupports7-bitaddressingandMaxspeed100kb/sec.

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2.3.4 Synchronous Peripheral Interface (SPI)
TheSPIinterfaceallowsfortheconnectionofexternaldeviceswithaserialinterface,e.g.EEPROMorA/D
converters,ortointerfacetoahostCPU.Theinterfacecanonlybeoperatedinslavemode.
FormoreinformationrefertotheSerial Peripheral Interface (SPI) Application Note[5].
MasterModeisnotsupported.
2.4 I/O Pins
2.4.1 Peripheral Input Output (PIO)
AllPIOshaveinternalpull-upsorpull-downs(PIO9only).ThusthereisnoneedtoconnectPIOstoGNDorVDDif
notused.ExceptionsfromthisgeneralrulearepinsRXD1,EXTINT0andEXTINT1.
AsignalchangeonpinsRXD1,EXTINT0,orEXTINT1canalsobeusedtowakeupthereceiverfromSleep-or
BackupMode.
PinsRXD1,EXTINT0,andEXTINT1arepoweredbythebackupdomain(VDD_B).Thesepinsdonothaveany
built-inpull-uporpull-downresistors.IfthesepinsarenotusedtheyshouldbeconnectedtoVDD_BortoGND.
Iftheymaybeundefinedduringoperationtheyshouldbeconnectedwith330kOhmsresistors(R8,R9,R10)to
theupperrailoftheinputvoltage(usuallyVDD_IO).
AMY-5
EXTINT1
EXTINT0
VDD_IO
VDD_IO
R9
VDD_IO VDD_IO
R10
RXD1
VDD_IO
R8

Figure 10: External pull-ups on RXD1, EXTINT0, EXTINT1
2.4.2 Configuration Pins
AMY-5Mmodulesprovideninepinsforboot-timeconfiguration.Thesepinsbecomeeffectiveimmediatelyat
start-up.Careneedstobeusedwhenconnectingthesepins,sincetheycanaffecttheconfigurationand
functionofthemodule.Figure11showsthesequenceofconfigurationatboot-time.