Quectel_EC20_原理图设计

TITLEPROJECT1.0EC20ReferenceDesignRadom.XIANGMountain.ZHOUCHECKEDBYDRAWNBYOFA654321SHEETABCD123456DCBQuectelWirelessSolutionsSIZEVER81DATE2015/3/30A2ModuleInterface1.KeepallRESERVEDandunusedpinsunconnected.Notes:2.Pin73~84and117~140areunusedinthedesign.YoucanignoretheminschematicandPCBdecal.ModuleInterface3.TheDBG_RXD/DBG_TXD,CTS/RTS/DCDandSDfunctionsarenotsupportedonEC20-Ecurrently.1WAKEUP_IN2AP_READY3RESERVED4W_DISABLE#5NET_MODE6NET_STATUS7VDD_EXT8GND9GND10USIM_GND11DBG_RXD12DBG_TXD13RESERVED14USIM_VDD15USIM_DATA16USIM_CLK17USIM_RST18RESERVED19GND20RESET_N21PWRKEY22GND23SD_INS_DET24PCM_IN*25PCM_OUT*26PCM_SYNC*27PCM_CLK*28SD1_DATA329SD1_DATA230SD1_DATA131SD1_DATA032SD1_CLK33SD1_CMD34VDD_SDIO35ANT_DIV36GND37RESERVED38RESERVED39RESERVED40RESERVED41I2C_SCL42I2C_SDA43RESERVED44ADC145ADC046GND47ANT_GNSS48GND49ANT_MAIN50GND51GND52GND53GND54GND55RESERVED56GND57VBAT_RF58VBAT_RF59VBAT_BB60VBAT_BB61STATUS62RI63DCD64CTS65RTS66DTR67TXD68RXD69USB_DP70USB_DM71USB_VBUS72GND115RESERVED116RESERVED113RESERVED114RESERVEDU101-A85GND86GND87GND88GND89GND90GND91GND92GND93GND94GND95GND96GND97GND98GND99GND100GND101GND102GND103GND104GND105GND106GND107GND108GND109GND110GND111GND112GNDU101-B[8]NET_STATUS[2,4,5,7]VDD_EXT[4]USIM_VDD[1,3,8]VBAT[8]STATUS[4]RXD_EC20[4]DTR_EC20[4]TXD_EC20[4]RI_EC20[8]NET_MODE[2]RESET_N[2,8]PWRKEY[5]PCM_IN[5]PCM_OUT[5]PCM_SYNC[5]PCM_CLK[6]ANT_DIV[1,3,8]VBAT[2,8]USB_VBUS[2,8]USB_DM[2,8]USB_DP[2]W_DISABLE#[2]AP_READY[4]USIM_GND[4]USIM_CLK[4]USIM_RST[4]USIM_DATA[6]ANT_MAIN[6]ANT_GNSS[5]I2C_SDA[5]I2C_SCL[8]DBG_RXD[8]DBG_TXD[4]CTS_EC20[4]RTS_EC20[4]DCD_EC20[7]SD1_DATA3[7]SD1_DATA2[7]SD1_DATA1[7]SD1_DATA0[7]SD1_CLK[7]SD1_CMD[7]VDD_SDIO[7]SD_INS_DETQuectelConfidentialTITLEPROJECTRadom.XIANGCHECKEDBYMountain.ZHOUDRAWNBYOFA654321SHEETABCD123456DCBQuectelWirelessSolutionsSIZEVER821.0DATE2015/3/30EC20ReferenceDesignA2Notes:1.U201representscustomer'sMCU.2.EC20canonlyworkasaUSBdeviceandsupportFS/HSmode.TocommunicatewithUSBinterface,VBUS_CONTROL=Highlevel,Q201conducts.Reserved5Vpowersourcefrommainboard.Itisusedtoresetthemodule.Itisusedtoturnonoroffthemodule.MCUInterfaceMCUneedstosupportUSBhostorOTGfunction.TheVBUSpinsofMCUandEC20needtobeprovidedby5VpowerforUSBdetection,andVBUS_CONTROLturnsonandoffVBUSpowersupply.3.AP_READYcanbeconfiguredtohighleveldetectionandlowleveldetection.FormoredetailsaboutAP_READY,pleaserefertothedocumentQuectel_EC20_Hardware_DesignandQuectel_EC20_AT_Commands_Manual.AP_READYHighleveldetectionAP_READYLowleveldetection4.Transistorcircuits(Q203~Q207)areusedforleveltranslation.ThenecessarycontrolcircuitMCUInterfaceR2020RR2010RGSDQ201SI2333CDS-T1Q202DTC043ZEBTLR20410KC201NM1VDD2GND3TXD4RXD5DTR6RI7CTS8RTS9DCD12USB_DM13USB_ID14GPIO_0115GPIO_0216GPIO_0317GPIO_0410USB_VBUS11USB_DP18GPIO_0519GPIO_0620GPIO_07U201Q203DTC043ZEBTLR20510KQ206DTC043ZEBTLR20647KR2030RQ205DTC043ZEBTLQ204DTC043ZEBTLQ2072SA2018R209100KR2084.7KR20710KVDD_MCU[4]TXD_MCU[4]RXD_MCU[4]DTR_MCU[4]RI_MCU[1,8]USB_DP[1,8]USB_DM[1,2,8]USB_VBUS[2]ON/OFF_MCU[2]RESET_MCU[2]VBUS_CONTROLDC_5V[1,2,8]USB_VBUS[2]VBUS_CONTROL[2]W_DISABLE_M[2]SLEEP_STATUSVDD_EXT[1]W_DISABLE#[2]W_DISABLE_MVDD_EXT[1,2]AP_READY[2]SLEEP_STATUS[1]RESET_N[2]RESET_MCU[1,8]PWRKEY[2]ON/OFF_MCUVDD_EXT[2]SLEEP_STATUS[1,2]AP_READYVDD_MCU[4]CTS_MCU[4]RTS_MCU[4]DCD_MCU[7]SD_PWR_EN[3]VBAT_ENQuectelConfidentialPROJECTTITLERadom.XIANGCHECKEDBYMountain.ZHOUDRAWNBYOFA654321SHEETABCD123456DCBQuectelWirelessSolutionsSIZEVER831.0DATE2015/3/30EC20ReferenceDesignA2e.g.5VLDOApplicationItisusedwhentheinputvoltageisbelow7V.VBAT=(R302/R303+1)*1.24=3.88VDC-DCApplicationItisusedwhentheinputvoltageisabove7V.UseDC-DCtoconverthighinpute.g.DC12VINDC-DCDC5VoutLDODC3.8Voutformodulevoltageto5V,andLDOwillgenerate3.8Vtypicalvoltageforthemodule.VDD_3.0V=(R305/R306+1)*1.207=3.0VSupplyPowerforPCMCodecandSDCardClosetothemoduleVBATpinsNote:VBATshouldberoutedinstarmodetoVBAT_BBandVBAT_RFpins.PowerSupplyDesignVBATDesignConnecttoVBAT_BBpinsConnecttoVBAT_RFpinsPowerDesign+C303470uF1EN2IN3GND4OUT5ADJU301MIC29302WUC304100nFC302100nF+C301470uFR302100K1%R30347K1%1IN3EN5OUT4BP2GNDU302SGM2019-ADJC3164.7uFR30563.4K1%R30642.2K1%C317100nFR30451KC3141uFC315100nF+C305100uFD301PZ3D4V2HR30151KC306100nFC30733pFC30810pFC310100nFC31133pFC31210pF+C309100uFR307470RD302TVSQ301DTC043ZEBTLDC_INVBATVDD_3.0VVBAT[1,3,8]VBAT[1,3,8]VBATVBAT[2]VBAT_ENQuectelConfidentialPROJECTTITLERadom.XIANGCHECKEDBYMountain.ZHOUDRAWNBYOFA654321SHEETABCD123456DCBQuectelWirelessSolutionsSIZEVER841.0DATE2015/3/30EC20ReferenceDesignA21.R401~R403areappliedtosuppresstheEMIspurioustransmissionNotes:2.R404canimproveanti-jammingcapabilityoftheUSIMcircuit,andUSIMandUARTDesignandenhancetheESDprotection.itshouldbeplacedclosetotheUSIMconnector.UARTTranslationICSolutionUARTTransistorSolution(Recommend)3.VCCAshouldnotexceedVCCB.FormoreinformationaboutTXS0108E,pleaserefertothedatasheetfromTI.4.Ifyouneedtoenablehighbaudrate,itishighlyrecommendedtoinstalla1nFcapacitor(C407/C408)ontransistorcirciut.USIMandUARTDesign5.TheDTRtransistorcircuitissimilarwithRTSinterface,andtheRIa