XR21V1414

ExarCorporation48720KatoRoad,FremontCA,94538•[phone]•FAX[phone]•(V1414)isanenhanced4-channelUSBUniversalAsynchronousReceiverandTransmitter(UART).TheUSBinterfaceisfullycomplianttoFullSpeedUSB2.0specificationthatsupports12MbpsUSBdatatransferrate.TheUSBinterfacealsosupportsUSBsuspend,resumeandremotewakeupoperations.TheV1414operatesfromaninternal48MHzclockthereforenoexternalcrystal/oscillatorisrequiredlikepreviousgenerationUARTs.Withthefractionalbaudrategenerator,anybaudratecanaccuratelybegeneratedusingtheinternal48MHzclock.Thelarge128-byteTXFIFOand384-byteRXFIFOoftheV1414helpstooptimizetheoveralldatathroughputforvariousapplications.TheAutomaticTransceiverDirectioncontrolfeaturesimplifiesboththehardwareandsoftwareforhalf-duplexRS-485applications.Ifrequired,themultidrop(9-bit)modewithautomatichalf-duplextransceivercontrolfeaturefurthersimplifiestypicalmultidropRS-485applications.TheV1414operatesfromasingle2.97to3.63voltpowersupplyandhas5Vtolerantinputs.TheV1414isavailableina48-pinTQFPpackage.WHQLcertifiedsoftwaredriversforWindows2000,XP,Vista,7,andCE,aswellasLinuxandMacaresupportedfortheXR21V1414.APPLICATIONS•PortableAppliances•ExternalConverters(dongles)•Battery-OperatedDevices•CellularDataDevices•FactoryAutomationandProcessControls•IndustrialapplicationsFEATURES•USB2.0Compliant,Full-speed(12Mbps)■SupportsUSBsuspend,resumeandremotewakeupoperations•EnhancedFeaturesofeachUART■Dataratesupto12Mbps■FractionalBaudRateGenerator■128byteTXFIFO■384byteRXFIFO■7,8or9databits■1or2stopbits■Odd,even,mark,space,ornoparity■AutomaticHardware(RTS/CTSorDTR/DSR)FlowControl■AutomaticSoftware(Xon/Xoff)FlowControl■Multidropmode■AutoTransceiverEnable■Half-Duplexmode■SelectableGPIOorModemI/O•Internal48MHzclock•Single2.97-3.63Vpowersupply•5Vtolerantinputs•48-pinTQFPpackage•VirtualCOMPortWHQLcertifieddrivers■Windows2000,XPVistaand7■WindowsCE4.2,5.0,6.0■Linux■MacXR21V141424-CHFULL-SPEEDUSBUARTREV.1.2.0FIGURE1.XR21V1414BLOCKDIAGRAMUSBSlaveInterface128-byteTXFIFOGPIOs/ModemIOTXARXAInternal48MHzOscillatorUSBD+USBD-384-byteRXFIFOGPIOA5/RTSA#GPIOA4/CTSA#GPIOA3/DTRA#GPIOA2/DSRA#GPIOA1/CDA#GPIOA0/RIA#/RWKA#UARTChannelAUARTChannelB(SameasChA)UARTChannelC(SameasChA)UARTChannelD(SameasChA)FractionalBRGTXBRXBGPIOB[5:0]/ModemIOTXCRXCGPIOC[5:0]/ModemIOTXDRXDGPIOD[5:0]/ModemIOInternalStatusandControlRegisters3.3VVCCGNDI2CInterfaceSDASCLXR21V14143REV.1.2.04-CHFULL-SPEEDUSBUARTNOTE:TR=TapeandReel,F=Green/RoHSFIGURE2.PINOUTASSIGNMENTORDERINGINFORMATIONPARTNUMBERPACKAGEOPERATINGTEMPERATURERANGEDEVICESTATUSXR21V1414IM48-F48-pinTQFP-40°Cto+85°CActiveXR21V1414IM48TR-F48-pinTQFP-40°Cto+85°CActive123456789101112363534333231302928272625XR21V141448-TQFP373839404142434445464748242322212019181716151413LOWPOWERGPIOD2/DSRD#GNDVCCGPIOA5/RTSA#GPIOA4/CTSA#TXBRXBGPIOB5/RTSB#GPIOB4/CTSB#GNDGPIOB3/DTRB#GPIOC5/RTSC#RXCTXCGPIOA1/CDA#GNDVCCGPIOA2/DSRA#GPIOA3/DTRA#GPIOB0/RIB#/RWKB#GPIOB1/CDB#GPIOB2/DSRB#GPIOA0/RIA#/RWKA#SDAGPIOD1/CDD#VCCGNDRXATXAGPIOC0/RIC#/RWKC#GPIOC1/CDC#GPIOC2/DSRC#GPIOC3/DTRC#SCLGPIOC4/CTSC#GPIOD3/DTRD#GPIOD0/RID#/RWKD#TXDRXDGNDGNDUSBD-USBD+VCCVCCGPIOD5/RTSD#GPIOD4/CTSD#XR21V141444-CHFULL-SPEEDUSBUARTREV.1.2.0PINDESCRIPTIONSPinDescriptionNAME48-QFNPIN#TYPEDESCRIPTIONUARTChannelASignalsRXA31IUARTChannelAReceiveDataorIRReceiveData.Thispinhasaninter-nalpull-upresistor.Internalpull-upresistorisnotdisabledduringsuspendmode.TXA30OUARTChannelATransmitDataorIRTransmitData.GPIOA0/RIA#/RWKA#21I/OUARTChannelAgeneralpurposeI/OorUARTRing-Indicatorinput(activelow)orRemoteWakeupInput(See”Section1.5.11,RemoteWakeup”onpage14.).Thispinhasaninternalpull-upresistorwhichisdisabledduringsuspendmode.IfusingthisGPIOasaninput,anexter-nalpull-upresistorisrequiredtominimizethepowerconsumptioninthesuspendmode.GPIOA1/CDA#20I/OUARTChannelAgeneralpurposeI/OorUARTCarrier-Detectinput(activelow).Thispinhasaninternalpull-upresistorwhichisdisableddur-ingsuspendmode.IfusingthisGPIOasaninput,anexternalpull-upresistorisrequiredtominimizethepowerconsumptioninthesuspendmode.GPIOA2/DSRA#17I/OUARTChannelAgeneralpurposeI/OorUARTData-Set-Readyinput(activelow).See”Section1.5.5,AutomaticDTR/DSRHardwareFlowControl”onpage13.Thispinhasaninternalpull-upresistorwhichisdisabledduringsuspendmode.IfusingthisGPIOasaninput,anexternalpull-upresistorisrequiredtominimizethepowerconsumptioninthesuspendmode.GPIOA3/DTRA#16I/OUARTChannelAgeneralpurposeI/OorUARTData-Terminal-Readyout-put(activelow).See”Section1.5.5,AutomaticDTR/DSRHard-wareFlowControl”onpage13.Thispinhasaninternalpull-upresistorwhichisdisabledduringsuspendmode.IfusingthisGPIOasaninput,anexternalpull-upresistorisrequiredtominimizethepowercon-sumptioninthesuspendmode.GPIOA4/CTSA#7I/OUARTChannelAgeneralpurposeI/OorUARTClear-to-Sendinput(activelow).See”Section1.5.4,AutomaticRTS/CTSHardwareFlowControl”onpage12.Thispinhasaninternalpull-upresistorwhichisdisabledduringsuspendmode.IfusingthisGPIOasaninput,anexternalpull-upresistorisrequiredtominimizethepowerconsu