Lora gateway设计介绍.pdf

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1、LoRaEndNodeDesignSupportSemtechSupportSemtechConfidentialSensornodedemoforAsia470MHz868/915MHz434MHzSemtechConfidential3BlockDiagramSemtechConfidential4Loramodule(LoraWAN)•SX1276LoRamodule--DesignbySMTC’spartner•HighperformanceSTM32MCU--powerfulenough

2、tosupportLoraMac•SmallSize:22mmx22mm•4LayersPCB,24pinsSMTpackage•TXOP=20dBm@434MHz/470MHz•TXOP=14dBm@868MHz/915MHz•32KHzexternalXTALforlowpowerconsumption•ReservedSPI,UART,I²C,USB,andothersGPIOSemtechConfidential5BlockofCherrymoduleSPI434/470MHzTXwith

3、20dBmUARTSWIM434/470MHzRXI²CSTM32L151C8U6SPISX1276868/915MHzTXwith14dBmADCGPIO868/915MHzRXSemtechConfidential6CherryModuleSchematicSemtechConfidential7SensorNodeSchematicSemtechConfidential8Layout--toplayer
4layersdesign
Toplayers--placementofcomponen

4、ts--RFpartroutingSemtechConfidential9Layout–Midlayer1
Midlayer1--afulllayerofGND--agoodandcleanGNDlayeriscrucialforRFperformanceSemtechConfidential10Layout–Midlayer2
Midlayer2--routingforpowersupply--PowersupplyisseparatedfromRFroutingbyGNDlayer--keep

5、acleandesignforpowersupplyisimportantSemtechConfidential11Layout–bottomlayer
Bottomlayer--routingfordigitalpartSemtechConfidential12Antennadesign
twooptions•--PCBAntenna•--ExternalAntennaSemtechConfidential13PCBAntenna--868MHz
PerformanceofPCBantenna@

6、868MHzEIRPFrequencyETotal.dB(dB)Efficiency()Conductive868MHz-4.35989%FrequencyOP(dBm)withenclosurewithoutenclosure868MHz14.5dBm7.26dBm9.31dBm•868MHz2Dand3DpatternSemtechConfidential14SWfunctiondefinition•SupportLoraWANClassA(batteryoperated)•Reportbel

7、owinformationfromsensorsperiodically(e.g.every5s)–Airpressure,altitudeandtemperature–GPSinformation–batterylevel–reserved:motiondetection()•Specified8channelat434/470/868/920MHZ•CouldreceiveACKandLEDON/OFFcommandfromserver•Lowpowerconsumptiondesignwit

8、honebuttonON/OFFSemtechConfidential15Uplink--packetonserverExample:ReservedBatteryGpsFunctionAirpressureTemperatureAltitudeGPSlatitudeGPSlongitudeFixedLevelAltitudebytenumbyte00byte01byte02byte03byte04byte05byte06byte07byte08byte09byte10byte11