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Version3.
2110/2/20121RN-171-DSRN-171802.
11b/gWirelessLANModuleFeaturesFCC/CE/ICcertified2.
4-GHzIEEE802.
11b/gtransceiverSmallformfactor:1050x700x130milConfigurabletransmitpower:0to10dBmRFpadconnectorforantennasCertifiedantennas:chipantenna,4"dipole,PCBtrace,andwireantennaUltra-lowpower:4-uAsleep,38-mARx,120-mATxat0dBmHighthroughput:921KbpsTX,500KbpsRXdataratewithTCP/IPandWPA2overUART,upto2MbpsoverSPIslave8-Mbitflashmemoryand128-KBRAM10general-purposedigitalI/Opins8analogsensorinterfacesReal-timeclockforwakeupandtimestampingAccepts3.
3-Vregulatedpowersupplyor3-VbatterySupportsadhocandinfrastructurenetworksCompleteon-boardTCP/IPnetworkingstackEnvironmentallyfriendly:RoHScompliantApplicationsRemoteequipmentmonitoringTelemetryIndustrialsensorsandhomeautomationcontrolsHomeautomationDescriptionTheRN-171moduleisacomplete,standaloneTCP/IPwirelessnetworkingmodule.
Withitssmallformfactorandextremelylowpowerconsumption,theRN-171isperfectformobilewirelessapplicationssuchasassetmonitoring,sensors,andportablebatteryoperateddevices.
Itincorporatesa2.
4-GHzradio,32-bitSPARCprocessor,TCP/IPstack,real-timeclock,cryptoaccelerator,powermanagement,andanalogsensorinterfaces.
Themoduleispreloadedwithfirmwaretosimplifyintegrationandminimizeapplicationdevelopment.
Inthesimplestconfiguration,thehardwareonlyrequiresfourconnections(PWR,TX,RX,andGND)tocreateawirelessdataconnection.
Additionally,theanalogsensorinputscanconnecttoavarietyofsensorssuchastemperature,audio,motion,andacceleration.
TheabilitytogointodeepsleepmodeandautomaticallyscanandassociatetoanaccesspointwhenawakemakestheRN-171suitableforroamingapplications.
TheRN-171alsoincludesabuilt-inHTMLclienttopostserialUARTdataorsensordatatoawebserverautomatically.
Figure1.
RN-171BlockDiagram128-KBRAM2.
4-GHzRadio2.
4-GHzPACryptoaccelerator32-BitCPU802.
11b/gMAC/PHYADC2-MBROMTimersSPIGPIOSDIOSensorInterface2-KBNVMPwrMgmtFlashMemorySPIGPIOUARTVDDINVDDBATT2.
4GHzTX/RXTraceforPCBAntennaRN-171www.
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2110/2/20122RN-171OVERVIEWHostdataratesupto921KbpsTX,500KbpsRXfortheUART,upto2MbpsovertheSPIslaveIntelligent,built-inpowermanagementwithprogrammablewakeupReal-timeclockfortimestamping,auto-sleep,andauto-wakeupConfigurationusingsimpleASCIIcommandsSoftwarecontrolledtransmitpower(0to10dBm)forultra-low-powerapplicationsMemory:128-KBRAM,2-MBROM,2-KBbattery-backedmemory,8-MbitflashSecureWi-FiauthenticationusingWEP-128,WPA-PSK(TKIP),andWPA2-PSK(AES)Built-innetworkingapplications:DHCP,UDP,DNS,ARP,ICMP,TCP,andHTMLclient802.
11powersaveandroamingfunctionsCastellatedpadsforreliablesolderingThemodule'smoisturesensitivitylevel(MSL)is1.
Themodulessizeandweightare:Size—1.
06x0.
70x0.
12inches(27x18x3.
1mm)Weight—0.
09ozTables1through5providedetailedspecificationsforthemodule.
Table1.
EnvironmentalConditionsParameterRN-171TemperatureRange(Operating)-40oC~+85oCTemperatureRange(Storage)-40oC~+85oCRelativeHumidity(Operating)≤90%RelativeHumidity(Storage)≤90%Table2.
ElectricalCharacteristics(Provisional)SupplyVoltageMin.
Typ.
Max.
UnitsSupplyvoltage(VBATToption)3.
03.
33.
7VDCDigitalinputInputlogichighVIH2.
3VDCInputlogiclowVIL1.
0VDCDigitalOutputDriveGPIO4,5,6,7,824mAGPIO9,10,11,12,138mAPowerConsumptionSleep4uAStandby(doze)-15-mAConnected(idle,RX)40mAConnected(TX)*0dBm120mA12dBm190mAwww.
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2110/2/20123RN-171Table3.
AnalogSensorInputsParameterValueSensor0,1,2,3wakeupdetectionthreshold500mVADsensor0-7measurementrange0-400mV(Donotexceed1.
2-VDC)Resolution14bits=12uVAccuracy5%un-calibrated,.
01%calibratedMinimumconversiontime35us(5kHzoverWi-Fi)Sensorpower(pin33)outputresistance3.
3V10ohms,maximumcurrent=50mATable4.
RadioCharacteristicsParameterSpecificationsFrequency2,402~2,480MHzModulation802.
11bcompatibility:DSSS(CCK-11,CCK-5.
5,DQPSK-2,DBPSK-1)802.
11g:OFDM(default)Channelintervals5MHzChannels1–14Transmissionrate(overtheair)1–11Mbpsfor802.
11b/6–54Mbpsfor802.
11gReceivesensitivity-83dBmtypicalOutputlevel(class1)-2dBmto+12dBm(configurableviasoftware)Table5.
TransmitPowerOutputPower802.
11b(2Mbps)CurrentinmANote(1)802.
11g(24Mbps)CurrentinmANote(1)012013521301504170190617520081802101018522512190240Note:1.
Measuredat3.
3-VDCVCC.
Thepowerconsumptionistheaveragepower,activeduringactualpowerconsumption.
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2110/2/20124RN-171TYPICALAPPLICATIONSCHEMATICFigure2showsatypicalapplicationschematicwithabatteryboostcircuit;Figure3showsatypicalschematicwithalinearregulator.
Figure2.
ApplicationSchematicwithBatteryBoostCircuitwww.
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2110/2/20125RN-171Figure3.
TypicalApplicationCircuitwithLinearRegulatorFigure4showsthepinpadsandTable6describesthepins.
Figure4.
PinPads48492829303133343221222324252627TopView353739414345363842404446472019181715141613119753121068421www.
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comVersion3.
2110/2/20126RN-171Table6.
PinDescriptionPadNumberSignalNameDescriptionOptionalFunctionDirectionNote(1)1GNDGround.
-2UnusedDonotconnect.
NoConnect3UnusedDonotconnect.
NoConnect4GPIO9Enableadhocmode,restorefactorydefaults,8mAdrive,3.
3-Vtolerant.
I/O5GPIO8GPIO,24-mAdrive,3.
3-Vtolerant.
TheRN-171drivesGPIO8HIGHonpowerup,whichoverridessoftwareconfiguredpowerupvalues,suchassetsysvalue0x0000onGPIO8.
I/O6GPIO7GPIO,24-mAdrive,3.
3-Vtolerant.
I/O7GPIO6GPIO,24-mAdrive,3.
3-Vtolerant,connectionstatusonRovingNetworks'firmware.
StatusofaccesspointassociationI/O8GPIO5GPIO,24-mAdrive,3.
3-Vtolerant.
DataTx/RxstatusI/O9GPIO4GPIO,24-mAdrive,3.
3-Vtolerant.
ConnectedoverTCPstatusI/O10VDD_3.
3V3.
3-Vpowersupply.
11GPIO3GPIO,8-mAdrive,3.
3-Vtolerant.
I/O12GPIO2GPIO,8-mAdrive,3.
3-Vtolerant.
I/O13GPIO1GPIO,8-mAdrive,3.
3-Vtolerant.
I/O14GNDGround.
-15UnusedDonotconnect.
NoConnect16UnusedDonotconnect.
NoConnect17UnusedDonotconnect.
NoConnect18UnusedDonotconnect.
NoConnect19UnusedDonotconnect.
NoConnect20GNDGround.
-21,22,23GNDGround.
-24ANTENNA802.
11b/g2.
4-Ghzantenna.
-25,26,27GNDGround.
-28GNDGround.
-29SENSOR0(2),(3)Sensorinterface,analoginputtomodule,1.
2-Vtolerant.
Input30SENSOR1(2),(3)Sensorinterface,analoginputtomodule,1.
2-Vtolerant.
Input31SENSOR2(2),(3)Sensorinterface,analoginputtomodule,1.
2-Vtolerant.
Input32SENSOR3(2),(3)Sensorinterface,analoginputtomodule,1.
2-Vtolerant.
Input33SENSORPOWEROutputvoltagefrommodule,3.
3Vmax.
-34VDD_3.
3V_RF3.
3-VRFpowersupply(connectto3.
3-Vrail).
-35SENSOR4(3)Sensorinterface,analoginputtomodule,1.
2-Vtolerant.
Input36SENSOR5(3)Sensorinterface,analoginputtomodule,1.
2-Vtolerant.
Input37SENSOR6(3)Sensorinterface,analoginputtomodule,1.
2-Vtolerant.
Input38SENSOR7(3)Sensorinterface,analoginputtomodule,1.
2-Vtolerant.
Input39GNDGround.
-40RESETOptionalmoduleresetsignal(activelow),100-kpullup,applypulseofatleast160us,3.
3-Vtolerant.
Input41FORCE_AWAKEOptionalmoduleawakesignal(activehigh),100-kpulldown,applypulseofatleast260us,3.
3-Vtolerant.
Input42GPIO14GPIO,8mAdrive,3.
3-Vtolerant.
I/Owww.
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comVersion3.
2110/2/20127RN-171PadNumberSignalNameDescriptionOptionalFunctionDirectionNote(1)43UART_RTSUARTRTSflowcontrol,8-mAdrive,3.
3-Vtolerant.
Output44UART_CTSUARTCTSflowcontrol,3.
3-Vtolerant.
Input45UART_RXUARTRX,3.
3-Vtolerant.
Input46UART_TXUARTTX,8-mAdrive,3.
3-Vtolerant.
Output47GNDGround.
-48SREG_3V3_CTRLBoostregulatorcontrol.
Output49VDD-BATTBatteryinput,2.
0-3.
3Vwithboostregulatorinuse,connecttoVDDifnotusingboostregulator.
-Notes:1.
SignalsmarkedasinputareinputstotheRN-171module.
Signalsmarkedasoutputareoutputsfromthemodule.
2.
Anyofthesensors0-3canbeusedtowakethemodule.
Thesensorpinsare1.
2-Vtolerant.
DONOTapply3.
3-Vonthesepins.
DONOTapply3.
3-Vonanyofsensorpins.
3.
Whensensorpinsareusedassensorinputs,theysaturateat400mV.
Sensorpinswillacceptinputvoltagesupto1.
2Vbutwillsaturateat400mV.
DONOTapply3.
3Vonanyofsensorpins.
Figure5showsthemodule'sphysicaldimensions.
Figure5.
ModulePhysicalDimensions1mil=0.
0254millimeters700mil1,050mil35mil150mil135mil35mil50mil185mil185milPadDimensions:40x90mil(roundedends)www.
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comVersion3.
2110/2/20128RN-171DESIGNCONCERNSThefollowingsectionsprovideinformationondesigningwiththeRN-171module,includingantennadesign,solderreflow,boostregulator,etc.
AntennaDesignTheRN-171supportsseveralantennadesigns,includingaPCBtraceantenna,chipantenna,wireantenna,andU.
FLconnector.
PCBTraceAntennaFigure6showsRovingNetworks'recommendedPCBtraceantennapattern.
Theantennagroundshouldbeconnectedtothegroundplaneand/orgroundpolygononboththetopandbottomlayerswithatleast2vias.
Thegroundplaneshouldcomeclosetotheantenna,exactlyasshowninFigure6;thedistanceiscritical.
Thereshouldbenogroundplace/traceundertheantennaunderanycircumstances.
Theantennafeedgoesthroughthepolygonona50-ohmimpedancetracetothesourceofthesignal.
Unlesstheantennatraceisexactly50ohmsandthesourcehasa50-ohmoutputimpedance,youshoulduseamatchingPIfilter(2capacitorsandaninductor).
TheleftsideoftheantennashouldbeplacedonthePCBedge.
Ifthatisnotpossible,leaveatleast1inchofclearancefromanytraceorgroundplane.
Thetopandbottomoftheantenna(theshorterside)shouldbeplacedonthePCBedgeorshouldhaveatleast1-inchclearancefromanytraceorgroundplane.
Tocontroltheimpedanceoftheantennafeedtheboardshouldbe4layerswithadedicatedgroundplaneandathicknessofaround8-14milsbetweenthegroundplaneandthetoplayer(wheretheantennafeedisrouted).
A2-layerboardwouldnotbethinenoughtoobtainthedesiredimpedanceusinganacceptabletracewidth.
Figure6.
PCBTraceAntennaPatternAntennaFeedAntennaGroundwww.
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2110/2/20129RN-171ThetracefromtheRFpadtotheantennafeedshouldbe12milsthickona4-layerPCBtoachieve50ohmsofimpedancematchingasshowninFigure7.
Figure7.
TracefromRFPadtoAntennaFeedChipAntennaIfyourdesignusesachipantenna,RovingNetworksrecommendsthe2450AT42A100manufacturedbyJohanson.
Refertotheantenna'sdatasheetforadditionalinformationsuchasdimensions,mountingconsiderations,andradiationpatterns.
Figure8showstheantennadimensions.
12-milThickTracefromRFPadtoAntennaFeedwww.
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2110/2/201210RN-171Figure8.
450AT42A100ChipAntennaDimensionsFigure9showsthechipantenna'smountingconsiderations.
Figure9.
ChipAntennaMountingConsiderationsFigure10showstherecommendedchipantennalayout.
Figure10.
RecommendedChipAntennaLayoutLWaT0.
197±0.
00080.
079±0.
00080.
043±0.
00080.
020±0.
00125.
00±0.
202.
00±0.
201.
10±0.
200.
50±0.
30LWTaInchesmmFeedingPointNoConnectFunction12No.
12TerminalConguration1.
01.
01.
83.
98.
94.
0Units:mmLinewidthshouldbedesignedtoprovide50-ohmimpedencematchingcharacteristics.
Mountthesedeviceswiththebrownmarkfacingup.
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2110/2/201211RN-171ThefeedconnectingtheantennatotheRFpadmustbe50ohminimpedance.
Ifthisfeedisshorterthan0.
2"theboardcanbe2layersandthethicknessofthefeedisthesameasdescribedinthemanufacturer'sdatasheet.
Ifthetraceislonger,youneeda4-layerboardwithcontrolledimpedance,i.
e.
,agroundplanedirectlyunderthetoplayer.
Thethicknessshouldbecalculatedaccordingly.
WireAntennaToimplementawireantenna,drillaholethroughtheboardontheRFpad(pin24)toplacethewireantenna.
Toprovide50ohmsofimpedancematching,theRFpathfromtheRFpad(Pin24)tothelocationofthewireantennashouldbe12milsthickona4-layerPCB.
SeeFigure11.
RovingNetworksrecommendsthatyouusean18-gaugewirewithalengthof1inch±0.
25.
Forbestperformance,thewireantennashouldbeperpendiculartothegroundplane.
NOTE:ThereshouldbenothermalreliefconnectorsonGNDforRFpathandonthegroundplane.
Figure11.
WireAntennaLocationU.
FLConnectorFigure12showsoneoptionforimplementingaU.
FLconnector.
ThetracefromtheRFpadtotheU.
FLconnectorshouldbe12milsthicktoachieve50ohmsofimpedancematchingona4-layerboard.
ThepartnumberoftheU.
FLconnectorusedforcertificationofthemoduleisU.
FL-R-SMfromHirose.
2829303132212223242526272019181716A1www.
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2110/2/201212RN-171Figure12.
U.
FLConnectorUsingBatteriesTheRN-171moduledoesnothaveaboostregulatorcircuit.
Thebatterychoiceisabsolutelycriticalbecauseifthebatteryvoltagedropsbelow3V,themoduleperformancestartstodegrade.
Onepossiblebatteryofchoiceisthe3.
6-VER14505battery,whichhasalongbatterylife.
Ifthisbatteryisusedtopowerthemodule,RovingNetworksrecommendsthatyouusea1,000–3,000uFbypasscapacitorbecausetheER14505batteryhashighoutputimpedance.
BoostRegulatorTheRN-171doesnothaveanon-boardboostregulator.
Figure13showsarecommendedcircuitfortheboostregulator.
Designsthatincludetheboostregulatorwillprovidegoodpowersupplytotheflashmemoryevenwhenthebatteryvoltagedropscloseto1.
8V.
IfaboardcontainingtheRN-171doesnotincludeaboostregulator,itSHOULDincludea2.
7-Vunder-voltageresetcircuittopreventthemodulefromaccessingtheflashmemorywhenthesupplyvoltagefallsbelow2.
7V.
AllsupportedflashchipsareratedforaminimumVDDof2.
7V.
2829303132212223242526272019181716www.
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2110/2/201213RN-171Figure13.
BoostRegulatorCircuitTable7showstherecommendedcomponentsfortheboostregulatorcircuit.
Table7.
BoostRegulatorCircuitComponentsDesignatorDescriptionValueManufacturerManufacturerPartNumberVendorVendorPartNumberDDiodeSchottky1A20VSMASS12MicroCommercialCoSS12-TPDigiKeySS12-TPCT-NDLInductor1.
0uH30%SMD1uHTaiyoYudenNR3015T1R0NDigiKey587-1647-1-NDQMOSFETN-CH20V5.
9ADMN2050LDiodesInc.
DMN2050L-7DigiKeyDMN2050LDICT-NDRovingNetworksrecommendsthatyouusealowvoltagedetectorcircuit,suchastheXC61fromTorex,tiedtotheRN-171module'sRESETpintoprotectfromlowvoltage.
Poweringfroma3.
3-VRegulatedSourceApply3.
3Vregulatedpowertopins10,34,and49.
Leavepin48(SREG_3V3_CTRL)unconnected.
NOTE:Donotconnectpin48toground.
Leaveitunconnected.
SolderReflowThereflowtemperaturemustnotexceed220°C.
ToreflowsoldertheRN-171moduleontoaPCB,RovingNetworksrecommendsaRoHScompliantsolderpasteequivalenttotheNIHONALMITpasteorOMNIXOM-310solderpastefromAlphametals.
Themodulepadsmusthaveasolderpastthicknessof5mil.
NOTE:Usenocleanflux.
DoNOTwaterwash!
ThetemperatureprofileisbasedontheIClevelandothercomponentslevelonly(withouttheshieldcan).
Fromtheperspectiveofthemoduleonly,aprofileabove245°Cshouldbeacceptable.
SeeFigures14and15.
www.
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2110/2/201214RN-171Figure14.
SolderReflowTemperatureProfileFigure15.
SolderReflowCurvewww.
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2110/2/201215RN-171COMPLIANCEINFORMATIONTable8describesthemodule'scomplianceinformation.
Table8.
ComplianceInformationSpecificationComplianceFCCPart15.
247FCCT9J-RN171ICRSS-210low-powercommunicationdeviceCEID#0681REGU9M21103-4249-CRADIOEN300328V1.
7.
1(10/2006)EMCEN301489-1V1.
8.
1(04/2008)EN301489-17V2.
1.
1(05/2009)SAFETYEN60950-1:2006+A11:2010EN503712002-03RoHsCompliantORDERINGINFORMATIONTable9providesorderinginformation.
Table9.
OrderingInformationPartNumberDescriptionRN-171IndustrialTemperature(-40to+85C)withRFpadforexternalantenna.
RN-174DevelopmentboardforRN-171modulecontaininganRS-232andTTLUARThardwareinterface,statusLEDs,powerregulator,andsensorconnections.
RN-SMA4-RP4"externalantennawithreversepolaritySMAconnector.
UsedwithRN-UFL-SMA6.
RN-UFL-SMA66"cablewithU.
FLconnectorononeendandSMAontheother.
Forotherconfigurations,contactRovingNetworksdirectly.
Gotohttp://www.
rovingnetworks.
comforcurrentpricingandalistofdistributorscarryingRovingNetworksproducts.
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2110/2/201216RN-171RovingNetworks,Inc.
102CooperCourtLosGatos,CA95032+1(408)395-5300www.
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Allrightsreserved.
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Customersshouldobtainthelatestrelevantinformationbeforeplacingordersandshouldverifythatsuchinformationiscurrentandcomplete.
RovingNetworksassumesnoliabilityforapplicationsassistanceorcustomer'sproductdesign.
CustomersareresponsiblefortheirproductsandapplicationswhichuseRovingNetworkscomponents.
Tominimizecustomerproductrisks,customersshouldprovideadequatedesignandoperatingsafeguards.
RovingNetworksproductsarenotauthorizedforuseinsafety-criticalapplications(suchaslifesupport)whereafailureoftheRovingNetworksproductwouldreasonablybeexpectedtocauseseverepersonalinjuryordeath,unlessofficersofthepartieshaveexecutedanagreementspecificallygoverningsuchuse.