Hemisphere GPS Crescent P206 Assembly Instructions


CrescentP206/P207OEMModules
IntegratorGuide
PartNo.875‐0344‐0Rev.A2




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.

ThisproductcomplieswiththeessentialrequirementsandotherrelevantprovisionsofDirective2014/53/EU.Thedeclarationof
conformitymaybeconsultedathttps://hemispheregnss.com/About‐Us/Quality‐Commitment.

CopyrightNotice
CopyrightHemisphereGNSS,Inc.(2017).Allrightsreserved.
NopartofthismanualmaybereproP206duced,transmitted,transcribed,storedinaretrievalsystemor
translatedintoanylanguageorcomputerlanguage,inanyformorbyanymeans,electronic,mechanical,
magnetic,optical,chemical,manualorotherwise,withoutthepriorwrittenpermissionofHemisphereGNSS.

Trademarks
HemisphereGNSS®,theHemisphereGNSSlogo,COASTTM,Crescent®,EclipseTM,e‐Dif®,L‐DifTM,miniEclipseTM,
PocketMAXPCTM,PocketMAXTM,PocketMax3TM,S320TM,SBX‐4TM,SureTrack®,VectorTM,XF1TM,andXF2TMare
proprietarytrademarksofHemisphereGNSS,Inc.Othertrademarksarethepropertiesoftheirrespective
owners.

Patents
HemisphereGNSSproductsmaybecoveredbyoneormoreofthefollowingpatents:

U.S.Patents AustraliaPatents
6111549 6876920 7400956 8000381 8214111 2002244539
6397147 7142956 7429952 8018376 8217833 2002325645
6469663 7162348 7437230 8085196 8265826 2004320401
6501346 7277792 7460942 8102325 8271194
6539303 7292185 7689354 8138970 8307535
6549091 7292186 7808428 8140223 8311696
6711501 7373231 7835832 8174437 8334804
6744404 7388539 7885745 8184050 RE41358
6865465 7400294 7948769 8190337
OtherU.S.andforeignpatentspending.
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NoticetoCustomers
Contactyourlocaldealerfortechnicalassistance.Tofindtheauthorizeddealernearyou:
HemisphereGNSS,Inc.8515E.
AndersonDriveScottsdale,AZ
85255USAPhone:(480)348‐
6380
Fax:(480)270‐5070
[email protected] www.hemispheregnss.com

TechnicalSupport
IfyouneedtocontactHemisphereGNSSTechnicalSupport:
HemisphereGNSS,Inc.8515E.
AndersonDriveScottsdale,AZ
85255USAPhone:(480)348‐
6380
Fax:(480)270‐5070
[e-mail]

DocumentationFeedback
HemisphereGNSSiscommittedtothequalityandcontinuousimprovementofourproductsandservices.Weurge
youtoprovideHemisphereGNSSwithanyfeedbackregardingthisguidebywritingtothefollowingemailaddress:
[e-mail].

CrescentIntegratorGuide iii PN875‐0344‐0RevA2

Contents
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Contents
Chapter1 Introduction...................................................................................1
CrescentOEMBoardOptions..........................................................................2
What’sIncluded...............................................................................................3
CrescentIntegration........................................................................................3
CommonFeaturesofCrescentBoards.............................................................3
MessageInterface...........................................................................................4
UsingPocketMaxtoCommunicatewiththeCrescent.....................................4
Chapter2 BoardOverview.............................................................................5
CrescentOEMBoardKeyFeatures..................................................................6
MechanicalLayout...........................................................................................7
Connectors......................................................................................................9
MountingOptions..........................................................................................10
DirectElectricalConnectionMethod....................................................10
IndirectElectricalConnection(Cable)Method.....................................10
HeaderLayoutsandPinouts..........................................................................11
Crescent34‐PinHeaderLayout/Pinout.................................................12
Crescent20‐PinHeaderLayout/Pinout.................................................14
Signals............................................................................................................15
RFInput.................................................................................................15
SerialPorts............................................................................................15
CommunicationPortD..........................................................................15
USBPorts..............................................................................................15
LEDIndicators.......................................................................................18
1PPSTimingSignal................................................................................18
EventMarkerInput...............................................................................18
Grounds................................................................................................18
SpeedRadarOutput..............................................................................19
Shielding........................................................................................................20
ReceiverMounting........................................................................................20
ThermalConcerns..........................................................................................20
Chapter3 Operation.....................................................................................21
PoweringtheCrescent...................................................................................22
CommunicatingwiththeCrescent.................................................................22
ConfiguringtheCrescent...............................................................................22
Firmware.......................................................................................................23
ConfiguringtheDataMessageOutput..........................................................23
‘THIS’Portandthe‘OTHER’Port...........................................................23

CrescentIntegratorGuide iv PN875‐0344‐0RevA2
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Contents
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SavingtheCrescentConfiguration.................................................................24
UsingPortDforRTCMInput..........................................................................24
ConfigurationDefaults...................................................................................24
AppendixA FrequentlyAskedQuestions.........................................................25
Integration.....................................................................................................26
SupportandRepair........................................................................................27
Power,Communication,andConfiguration...................................................28
GNSSReceptionandPerformance.................................................................29
SBASReceptionandPerformance.................................................................30
ExternalCorrections......................................................................................31
Installation.....................................................................................................31
AppendixB Troubleshooting...........................................................................33
AppendixC TechnicalSpecifications................................................................37
P206Specifications........................................................................................38
P207Specifications........................................................................................40
Index..........................................................................................................................43
EndUserLicenseAgreement......................................................................................45
WarrantyNotice.........................................................................................................48

CrescentIntegratorGuide 1  PN875‐0344‐0RevA2
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Chapter1:Introduction
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Chapter1:Introduction
CrescentOEMBoardOptions
What’sIncluded
CrescentIntegration
CommonFeaturesofCrescentBoards
MessageInterface
UsingPocketMaxtoCommunicatewiththeCrescent

CrescentIntegratorGuide 2  PN875‐0344‐0RevA2
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Chapter1:Introduction
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Thismanualdoesnotcoverreceiveroperation,thePocketMax™utility,orcommandsandmessages
(NMEA0183,NMEA2000®orHGPSproprietary).Forinformationonthesesubjectsrefertothe
HemisphereGNSSTechnicalReference(gotowww.hemispheregnss.comandfollowthelinksto
Resources,GNSSReferenceGuide).

CrescentOEMBoardOptions
TheCrescent™OEMboardisavailableintwoformfactorsasshowninTable1‐1.
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Table1‐1:Crescentboardoptions
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Model GNSSSystems Compatibility L‐BandSupport
P206™ L1/L2GPS,GLONASS
andBEIDOU
HemisphereGNSS’standard
pinoutconfiguration(34‐pin)
Yes‐withoptional
HemisphereGNSSLX‐2
OEMboard
P207™ L1/L2GPS,GLONASS
andBEIDOU
Compatiblewithpopular
aftermarketproducts(20‐pin)
No
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Note:ThismanualcoversCrescentP206andP207OEMboards.Whenreferringtobothboards
thismanualusesthetermCrescent.WhenreferringtoeitherCrescentmodelthismanualusesthe
modelname(P206orP207).

CrescentIntegratorGuide 3  PN875‐0344‐0RevA2



Chapter1:Introduction


What’sIncluded
TheCrescentisavailableintwoconfigurations:
• CrescentOEMboardonly‐designedforintegratorswhoarefamiliarwithCrescent
boardintegration
• CrescentOEMboardandUniversalDevelopmentKit‐designedfor
integratorswhoarenewtoCrescentboardintegration
TheUniversalDevelopmentKitisdesignedtoworkwithvariousHemisphereGNSS
OEMboardsandincludesanenclosurewithcarrierboard,adapterboards,and
variouscables.
FormoreinformationontheUniversalDevelopmentKitvisitwww.hemispheregnss.com
andnavigatetotheOEMProductspageorcontactyourlocaldealer.

CrescentIntegration
SuccessfulintegrationoftheCrescentwithinasystemrequireselectronicsexpertisethatincludes:
• Powersupplydesign
• Serialportleveltranslation
• Reasonableradiofrequencycompetency
• Anunderstandingofelectromagneticcompatibility
• Circuitdesignandlayout
TheCrescentGNSSengineisalow‐levelmoduleintendedforcustomintegrationwiththefollowing
generalintegrationrequirements:
• Regulatedpowersupplyinput(3.3VDC±3%)and420mAcontinuous
• Low‐levelserialport(3.3VCMOS)and/orUSBportcommunications
• Radiofrequency(RF)inputtotheenginefromaGNSSantennaisrequiredtobeactively
amplified(10to40dBgain)
• GPSantennaispoweredwithaseparateregulatedvoltagesourceupto15VDC
maximum
• Antennainputimpedanceis50

CommonFeaturesofCrescentBoards
CommonfeaturesofCrescentboardsinclude:
• 372‐channelGNSSengine
• Sub‐meterhorizontalaccuracy95%
• Rawmeasurementoutput(viadocumentedbinarymessages)
• Positionandheadingupdateratesof20Hzmax
• COAST™technologythatprovidesconsistentperformancewithcorrectiondata
• e‐Dif®‐ready‐abasestation‐freewayofdifferentiallypositioning

CrescentIntegratorGuide 4  PN875‐0344‐0RevA2



Chapter1:Introduction


• L‐Dif™‐ready–LocaldifferentialisaproprietaryHemisphereGNSSmethodwherea
specializedsetofmessagesarerelayedbetweentwoCrescentreceivers
• Quicktimestofirstfix
• Fourfull‐duplexserialports
• USBports
– USBdeviceportonly(P207)
– USBhostandUSBdeviceports(P206)
• 1PPStimingoutput
• Eventmarkerinput


MessageInterface
TheCrescentusesaNMEA0183interface,allowingyoutoeasilymakeconfigurationchangesby
sendingtext‐typecommandstothereceiver.
TheCrescentalsosupportsaselectionofbinarymessages.Thereisawiderarrayofinformation
availablethroughthebinarymessages,plusbinarymessagesareinherentlymoreefficientwith
data.Iftheapplicationhasarequirementforrawmeasurementdata,thisinformationisavailable
onlyinabinaryformat.
FormoreinformationonNMEA0183commandsandmessagesaswellasbinarymessagesreferto
theHemisphereGNSSTechnicalReference(gotowww.hemispheregnss.comandfollowthelinksto
Resources,GPSReferenceGuide).


UsingPocketMaxtoCommunicatewiththeCrescent
Hemisphere’sPocketMaxisafreeutilityprogramthatrunsonyourWindowsPCorWindows
mobiledevice.SimplyconnectyourWindowsdevicetotheCrescentviatheCOMportandopen
PocketMax.ThescreenswithinPocketMaxallowyoutoeasilyinterfacewiththeCrescentto:
• SelecttheinternalSBAS,externalbeacon,orRTCMcorrectionsourceandmonitor
reception(beaconoptional)
• ConfigureGNSSmessageoutputandportsettings
• Recordvarioustypesofdata
• MonitortheCrescent’sstatusandfunction
PocketMaxisavailablefordownloadfromtheHemisphereGNSSwebsite
(www.hemispheregnss.com).
Note:ForcompletespecificationsofCrescentboardsseeAppendixC,“TechnicalSpecifications.”

CrescentIntegratorGuide 5  PN875‐0344‐0RevA2



Chapter2:BoardOverview


Chapter2:BoardOverview
CrescentOEMBoardKeyFeatures
MechanicalLayout
Connectors
MountingOptions
HeaderLayoutsandPinouts
Signals
Shielding
ReceiverMounting
ThermalConcerns

CrescentIntegratorGuide 6  PN875‐0344‐0RevA2



Chapter2:BoardOverview


CrescentOEMBoardKeyFeatures
Withitssmallformfactor,lowpowerconsumption,andsimpleon‐boardfirmwareCrescentisan
idealsolutionforintegrators,offeringscalabilityandexpandabilityfromL1GPSwithSBAStoL1
GPS,GLONASSandBeiDou(withRTKcapability).




Crescentisofferedintwocommonindustryformfactors:
• P206isadrop‐inreplacementsforHemisphereGNSS’Crescent®andminiEclipse
receivers(34‐pin)andprovideL‐bandsupportwiththeoptionalHemisphereGNSSLX‐
2™OEMboard
• P207hasamechanicaldesigncompatiblewithpopularaftermarketproducts
(20‐pin)
ThereliablepositioningperformanceofCrescentisfurtherenhancedthroughCrescentRTKand
COASTDGPStechnology.
WithCrescent,RTKperformanceisscalable.Utilizethesamecentimeter‐levelaccuracyineitherL1
GPS‐onlymode,oremploytheperformanceofallavailableL1GPS,GLONASSandBeiDouGNSS
signals.HemisphereGNSS’SureTracktechnologyprovidespeaceofmindknowingtheRTKroveris
makinguseofeverysatelliteitistracking.BenefitfromfewerRTKdropoutsincongested
environments,fasterreacquisition,andmorerobustsolutionsduetobettercycleslipdetection.
PatentedCOASTsoftwareenablesselectHemisphereGNSSreceiverstoutilizeagingDGPScorrection
data during times of interference, signal blockage, and weak signal. Thereceiverwillcoastand
continuetomaintainsub‐meterpositioningfor40minutesormorewithoutaDGPSsignal.

CrescentIntegratorGuide 7  PN875‐0344‐0RevA2



Chapter2:BoardOverview


MechanicalLayout
Figure2‐1showsthemechanicallayoutfortheCrescentP206OEMboard.Figure2‐2
shows the mechanical layout for the Crescent P207 OEM board. Dimensions are in
millimeters(inches)forallthreelayouts.


40.6 mm
(1.60 in)
34.3 mm
(1.35 in)
3.2mm 3.2mm
(.13 in)
(.13 in)
64.8 mm
(2.55 in)
71.1mm
(2.80 in)
7.4 mm
(.29 in)
4.2mm
(.17 in)
1.5 mm
(.06 in)
6.8 mm
(.27 in)
10.2 mm
(.40 in)
3.9 mm
(.15 in)
3.2 mm x4
(.13 in)
MCXJACK
RECEPTACLE


28.8 mm
(1.13 in)
4.3 mm
(.17 in)
Figure2‐1:CrescentP206mechanicallayout

CrescentIntegratorGuide 8  PN875‐0344‐0RevA2
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

Chapter2:BoardOverview




40.6 mm
(1.60 in)
34.3 mm
(1.35 in)
3.2 mm
4.6 mm 3.2 mm
(.13 in)
(.18 in)
64.8 mm
(2.55 in)
72.6 mm
(2.85 in)
(.13 in)
7.4 mm
(.29 in)
4.2 mm
(.17 in)
1.5 mm
(.06 in)
5.9 mm
(.23 in)
11.2 mm
3.2 mm
(.13 in)
3.2 mm x 4
(.13 in)
(.44 in)
MCX JACK
RECEPTACLE
12.6 mm
(.49 in)
4.8 mm
(.19 in)
Figure2‐2:CrescentP207mechanicallayout

CrescentIntegratorGuide 9  PN875‐0344‐0RevA2
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

Chapter2:BoardOverview


Connectors
Table2‐1describesCrescentconnectorsandmatingconnectors.Youcanusedifferentcompatible
connectors;however,therequirementsmaybedifferent.Theantennainputimpedanceis50.

Table2‐1:Crescentconnectors

CrescentBoardand
ConnectorType

CrescentSMTConnector

MatingConnector
Crescent
(P206
RF MCX,femalestraightjack
Emerson(Johnson)133‐3711‐202
MCX,malestraightplug
SamtecRSP‐127824‐01
Power/ 34‐pin(17x2)maleheader, 17x2femaleSMTheader
data 0.05in(1.27mm)pitch socket,0.05in(1.27mm)pitch
SamtecFTSH‐117‐01‐L‐DV(older SamtecFLE‐117‐01‐G‐DV
P200boards)
SamtecFTSH‐117‐04‐L‐DV
Crescent
(P207)
RF MCX,femalestraightjack
Emerson(Johnson)133‐3711‐202
MCX,malestraightplug
SamtecRSP‐127824‐01
Power/
data
20‐pin(10x2)maleheader,
0.08in(2mm)pitch
SamtecTMM‐110‐01‐T‐D‐SM
10x2femaleSMTheadersocket,
0.08in(2mm)pitch
SamtecTLE‐110‐01‐G‐DV
Note:FortheSamtecFTSHheaders,‘‐04’indicates0.150”posts.

CrescentIntegratorGuide 10 PN875‐0344‐0RevA2
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
Chapter2:BoardOverview


MountingOptions
TherearetwooptionsformountingtheCrescent:
• DirectElectricalConnectionmethod
• IndirectElectricalConnection(Cable)method

DirectElectricalConnectionMethod
PlaceanRFconnector,headingconnector,andmountingholesonthecarrierboardandthen
mounttheCrescentonthestandoffsandRFandheaderconnectors.Thismethodisverycost
effectiveasitdoesnotusecableassembliestointerfacetheCrescent.

TheCrescentusesastandoffheightof7.9mm(0.3125in).Withthisheightthereshouldbeno
washersbetweeneitherthestandoffandtheCrescentorthestandoffandthecarrierboard;
otherwise,youmustmakeaccommodations.Youmayneedtochangethestandoffheightifyou
selectadifferentheaderconnector.
IfyouwanttousearightangleMCXconnector,useatallerheaderthantheSamtecpartnumber
suggestedinthisguide.Thiswillprovideclearancetohavearightanglecable‐mountconnectorand
reducethecomplexitybynothavingthecarrierboardhandletheRFsignals.SeeTable2‐1onpage
9forCrescentconnectorinformation.
ThemountingholesoftheCrescenthaveastandardinnerdiameterof3.2mm(0.125in).

IndirectElectricalConnection(Cable)Method
ThesecondmethodistomounttheCrescentmechanicallysoyoucanconnectaribbonpower/data
cabletotheCrescent.Thisrequirescableassembliesandthereisareliabilityfactorpresentwith
cableassembliesinadditiontoincreasedexpense.
Note:BeawareoftheGPSRFsignalspresentonthecarrierboardandensurethecorrectstandoff
heighttoavoidanyflexualstressesontheboardwhenyoufastenitdown.

CrescentIntegratorGuide 11 PN875‐0344‐0RevA2
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
Chapter2:BoardOverview


HeaderLayoutsandPinouts
TheCrescentusesadual‐rowheaderconnectortointerfacewithpower,communications,and
othersignals.
Toidentifythefirstheaderpinorienttheboardsothediamondistotheupperleftofthepins;the
firstpinisontheleftdirectlybelowthediamond(seeFigure2‐3).Thepinsarethensequentially
numberedperrowfromtoptobottom.

Figure2‐3:Identifyingthefirstpinontheheaderconnector

CrescentIntegratorGuide 12 PN875‐0344‐0RevA2
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Chapter2:BoardOverview


Crescent34‐PinHeaderLayout/Pinout
TheP206boardshavea34‐pinheader.Figure2‐4showstheheaderlayoutandTable2‐2provides
theheaderpinout.

Figure2‐4:Crescent34‐pinheaderlayout


Table2‐2:Crescent34‐pinheaderpinout

Pin Name Type Description
1  3.3V Power Receiverpowersupply,3.3V
2  3.3V Power Receiverpowersupply,3.3V
3  AntennaPwr Power Antennapower,DC,15Vmax
4  BattBackup Power Power,1.5to5.5V,500nAtypical
5  USBDEV+ I/O USBdevicedata+
6  USBDEV– I/O USBdevicedata‐
7  GND Power Receiverground
8  GND Power Receiverground
9  PATX Output PortAserialoutput,3.3VCMOS,idlehigh
10 PARX Input PortAserialinput,3.3VCMOS,idlehigh
11 PBTX Output PortBserialoutput,3.3VCMOS,idlehigh
12 PBRX Input PortBserialinput,3.3VCMOS,idlehigh
13 PDTX Output PortDserialoutput,3.3VCMOS,idlehigh
14 PDRX Input PortDserialinput,3.3VCMOS,idlehigh
15 1PPS Output Activehigh,risingedge,3.3VCMOS
16 ManualMark Input Activelow,fallingedge,3.3VCMOS
17 GPSLock Output Statusindicator,3.3VCMOS,activelow
18 DiffLock Output Statusindicator,3.3VCMOS,activelow
19 DGPSLock Output Statusindicator,3.3VCMOS,activelow
20 n/c n/c n/c
21 GPIO0 I/O Generalpurposeinput/output
22 GPIO1 I/O Generalpurposeinput/output
23 GPIO2 I/O Generalpurposeinput/output

CrescentIntegratorGuide 13 PN875‐0344‐0RevA2
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
Chapter2:BoardOverview


Table2‐2:Crescent34‐pinheaderpinout(continued)

Pin Name Type Description
24 GPIO3 I/O Generalpurposeinput/output
25 SpeedOutput Output 0‐3Vvariableclockoutput
26 SpeedReady Output Activelow,speedvalidindicator,3.3VCMOS
27 GND Power Receiverground
28 GND Power Receiverground
29 n/c n/c n/c
30 n/c n/c n/c
31 PCTX Output PortCserialoutput,3.3VCMOS,idlehigh
32 PCRX Input PortCserialinput,3.3VCMOS,idlehigh
33 L‐BandEnable Output Reserved
34 Reset Open
collector 
Reset,opencollector,3.3Vtypical,notrequired
Note: • Pinsarenot5Vtolerant.Thepinvoltagerangeis0to3.3VDC,unless  otherwise
noted.
• LeaveanydataorI/Opinsthatwillnotbeusedunconnected.

CrescentIntegratorGuide 14 PN875‐0344‐0RevA2



Chapter2:BoardOverview


Crescent20‐PinHeaderLayout/Pinout
TheP207boardshavea20‐pinheader.Figure2‐5showstheheaderlayoutandTable2‐3provides
theheaderpinout.

Figure2‐5:Crescent20‐pinheaderlayout


Table2‐3:Crescent20‐pinheaderpinout

Pin Name Type Description
1  AntennaPwr Power Antennapower,DC,15Vmax
2  3.3V Power Receiverpowersupply,3.3V
3  USBDEV– I/O USBdevicedata‐
4  USBDEV+ I/O USBdevicedata+
5  Reset Open collector  Reset,opencollector,3.3Vtypical,notrequired
6  PCRX Input PortCserialinput,3.3VCMOS,idlehigh
7  PCTX Output PortCserialoutput,3.3VCMOS,idlehigh
8  PDRX Input PortDserialinput,3.3VCMOS,idlehigh
9  PDTX Output PortDserialoutput,3.3VCMOS,idlehigh
10 GND Power Receiverground
11 PATX Output PortAserialoutput,3.3VCMOS,idlehigh
12 PARX Input PortAserialinput,3.3VCMOS,idlehigh
13 GND Power Receiverground
14 PBTX Output PortBserialoutput,3.3VCMOS,idlehigh
15 PBRX Input PortBserialinput,3.3VCMOS,idlehigh
16 GND Power Receiverground
17 ManualMark Input Activelow,fallingedge,3.3VCMOS
18 GND Power Receiverground
19 1PPS Output Activehigh,risingedge,3.3VCMOS
20 PositionValid
Indicator
Output Statusindicator,3.3VCMOS,activelow
Note: • Pinsarenot5Vtolerant.Thepinvoltagerangeis0to3.3VDC,unless  otherwise
noted.
• LeaveanydataorI/Opinsthatwillnotbeusedunconnected.

CrescentIntegratorGuide 15 PN875‐0344‐0RevA2



Chapter2:BoardOverview


Signals
Thissectionprovidesinformationonthesignalsavailableviaconnectors.

RFInput
TheCrescentisdesignedtoworkwithactiveGNSSantennaswithanLNAgainrangeof10to40dB.
Thepurposeoftherangeistoaccommodateforlossesinthecablesystem.Essentially,thereisa
maximumcablelossbudgetof30dBfora40dBgainantenna.Dependingonthechosenantenna,
thelossbudgetwilllikelybelower(a24dBgainantennawouldhavea14dBlossbudget).
WhendesigningtheinternalandexternalcableassembliesandchoosingtheRFconnectors,
donotexceedthelossbudget;otherwise,youwillcompromisethetrackingperformanceof
theCrescent.
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SerialPorts
TheCrescentCrescenthasfourserialcommunicationports:
• PortA,PortB,PortC‐mainports
• PortD‐ExclusivelyusedtointerfacewiththeSBXbeaconboardoranexternal
correctionssource.ThisportwillnotoutputnormalGPS‐relatedNMEAmessages.
WhencommunicatingintoeitherPortA,B,orC,avirtualconnectionmaybe
establishedtothedeviceonPortDusingthe$JCONNcommand.See“Communication
PortD”belowformoreinformationonPortD.
TheCrescentserialports’3.3VCMOSsignallevelcanbetranslatedtointerfacetootherdevices.
Forexample,ifserialPortsA,B,and/orCareusedtocommunicatetoexternaldevices(suchasPCs)
youmusttranslatethesignallevelfrom3.3VCMOStoRS‐232.
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CommunicationPortD
PortDisexclusivelyforexternalDGPScorrectioninputtotheCrescent,suchasfromHemisphere
GNSS’SBXbeaconboard.
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USBPorts
TheCrescentP206hasbothaUSBhostportandaUSBdeviceportwhileP207hasonlyaUSBdevice
port,where:
• USBdeviceport(datacommunication)showninFigure2‐6onpage16servesasa
highspeeddatacommunicationsport,suchasforaPC
• USBhostport(datastorage)showninFigure2‐7onpage17servesasadatastorageport,
suchaswithaUSBflashdrive
TheUSBdatalinesarebidirectionalandaredifferentialpairs.TheUSBdatalinesshouldbelaidout
onprintedwireboard(PWB)with90 ±15%differentialimpedance.Thetracesshouldbeovera
solidcontinuousgroundplane.Maintainparalleltracesandsymmetry.Thereshallbenotracesor
breaksinthegroundplaneunderneaththeD+andD‐traces.Itisalsorecommendedtoleavea
minimum20milspacingbetweenUSBsignalsandothersignals.TreatthedatalinesasiftheyareRF
signals.

CrescentIntegratorGuide 16 PN875‐0344‐0RevA2
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Chapter2:BoardOverview
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RelevantDeviceCrescentPins
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USBDevice+USB
Device–
USB+Host
USB–Host
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DevicecanuseUSBType‐Bor
Mini‐Bconnectors.IfMini‐B
isused,“ID”pin4isNOTCONNECTED.
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Normally,adeviceuses5V;however,since
Crescentusesmorethan500mA(2.5W)it
cannotusetheBUS‐supplied5Vand
thereforeitisnotconnected
Figure2‐6:CrescentUSBdevicedesignexample