Fibocom Wireless L831 LTE Module User Manual ng

Fibocom Wireless Inc. LTE Module ng

User Manual

ngL831-EA Module HardwareUser ManualVersion: V1.0.1Date: 2015-02-12
L831-EA Module Hardware User Manual Page2of43Confidential MaterialThis document contains information highly confidential to Fibocom Wireless Inc. (Fibocom). Fibocomoffers this information as a service to its customers, to support application and engineering efforts that usethe products designed by Fibocom. The information provided is based upon requirements specificallyprovided to Fibocom by the customers. All specifications supplied herein are subject to change.Disclosure of this information to other parties is prohibited without the written consent of Fibocom.CopyrightCopy, Reproduce, Distribute and/or Edit of this document or part of it as well as utilization of its contentsand communication thereof to others without express authorization are prohibited. Offenders will be heldliable for payment of damages. All rights created by patent grant or registration of a utility model or designpatent are reserved. Copyright ©2015 Fibocom Wireless Inc. All rights reserved.Trademarks NoticeThe FIBOCOM Logo is registered by Fibocom Wireless Inc. All other product or service names or logosare the property of their respective owners. Copyright ©2015 Fibocom Wireless Inc. All rights reserved.
L831-EA Module Hardware User Manual Page3of43FOR FCCFederal Communications Commission (FCC) Declaration of ConformityThis 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 interferencereceived, including interference that may cause undesired operation.This device has been tested and found to comply with the limits for a Class B digital , pursuant to Part 15of the FCC Rules. These limits are designed to provide reasonable protection against harmfulinterference in a residential installation. This equipment generates, uses and can radiated radio frequencyenergy and, if not installed and used in accordance with the instructions, may cause harmful interferenceto radio communications. However, there is no guarantee that interference will not occur in a particularinstallation If this equipment does cause harmful interference to radio or television reception, which canbe determined by turning the equipment off and on, the user is encouraged to try to correct theinterference by one or more of the following measures:-Reorient or relocate the receiving antenna.-Increase the separation between the equipment and receiver.-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.-Consult the dealer or an experienced radio/TV technician for help.FCC Caution:Changes or modifications not expressly approved by the party responsible for compliance could void theuser‘s authority to operate the equipment.RF Exposure InformationThis device meets the government’s requirements for exposure to radio waves.This device is designed and manufactured not to exceed the emission limits for exposure to radiofrequency (RF) energy set by the Federal Communications Commission of the U.S. Government.This device complies with FCC radiation exposure limits set forth for an uncontrolled environment. Inorder to avoid the possibility of exceeding the FCC radio frequency exposure limits, human proximity tothe antenna shall not be less than 20cm (8 inches) during normal operation.
L831-EA Module Hardware User Manual Page4of43IMPORTANT NOTE:This module is intended for OEM integrator. The OEM integrator is still responsible for the FCCcompliance requirement of the end product, which integrates this module. 20cm minimum distance has tobe able to be maintained between the antenna and the users for the host this module is integrated into.Under such configuration, the FCC radiation exposure limits set forth for an population/uncontrolledenvironment can be satisfied.Any changes or modifications not expressly approved by the manufacturer could void the user's authorityto operate this equipment.USERS MANUAL OF THE END PRODUCT:In the users manual of the end product, the end user has to be informed to keep at least 20cm separationwith the antenna while this end product is installed and operated. The end user has to be informed thatthe FCC radio-frequency exposure guidelines for an uncontrolled environment can be satisfied. The enduser has to also be informed that any changes or modifications not expressly approved by themanufacturer could void the user's authority to operate this equipment. If the size of the end product issmaller than 8x10cm, then additional FCC part 15.19 statement is required to be available in the usersmanual: This device complies with Part 15 of FCC rules. Operation is subject to the following twoconditions: (1) this device may not cause harmful interference and (2) this device must accept anyinterference received, including interference that may cause undesired operation.LABEL OF THE END PRODUCT:The final end product must be labeled in a visible area with the following " Contains TX FCC ID:ZMOL831". If the size of the end product is larger than 8x10cm, then the following FCC part 15.19statement has to also be available on the label: This device complies with Part 15 of FCC rules.Operation is subject to the following two conditions: (1) this device may not cause harmful interferenceand (2) this device must accept any interference received, including interference that may causeundesired operation.
L831-EA Module Hardware User Manual Page5of43Revision HistoryVersionDateRemarksV1.0.02014-12-30Initial versionV1.0.12015-02-12Update the consumption and the power on/off timing
L831-EA Module Hardware User Manual Page6of43Applicability TableNo.TypeNote1L831-EAThe difference of L831-EA wireless module as listed below:Model TypeLTE FDDWCDMAGSM/GPRS/EDGEL831-EABand1,2,3,4,5,7,8,13,17,18,19,20Band 1,2,4,5,8850/900/1800/1900MHz
L831-EA Module Hardware User Manual Page7of43ContentsIMPORTANT NOTE:................................................................................................................................................... 41 Preface..................................................................................................................................................................... 101.1 Outline........................................................................................................................................................... 101.2 Standards..................................................................................................................................................... 102 Introduction.............................................................................................................................................................. 122.1 Description................................................................................................................................................... 122.2 Specifications...............................................................................................................................................122.3 Appearance.................................................................................................................................................. 153 Mechanical...............................................................................................................................................................163.1 Dimension.....................................................................................................................................................163.2 Application Interface Description..............................................................................................................173.3 M.2 Connector............................................................................................................................................. 184 Hardware Overview................................................................................................................................................194.1 Pins Definition..............................................................................................................................................194.1.1 Pins Number.....................................................................................................................................194.1.2 Pins Description............................................................................................................................... 205 Hardware Interface.................................................................................................................................................245.1 Power Interface........................................................................................................................................... 245.1.1 Power Supply................................................................................................................................... 245.1.2 VSD2_1V8........................................................................................................................................ 245.2 Power on/off and Reset Signal................................................................................................................. 255.2.1 Power on/off Signal......................................................................................................................... 255.2.1.1 Power on................................................................................................................................255.2.1.2 Power off................................................................................................................................255.2.1.3 Recommended Circuit Design of Power on/off signals................................................. 265.2.2 RESET Signal.................................................................................................................................. 275.3 Index Signal................................................................................................................................................. 285.3.1 Index Signal Pins............................................................................................................................. 285.4 USB Interface...............................................................................................................................................285.4.1 Definition of USB Interface.............................................................................................................285.4.2 Application for USB Interface........................................................................................................ 295.5 USIM Interface.............................................................................................................................................29
L831-EA Module Hardware User Manual Page8of435.5.1 USIM Pins......................................................................................................................................... 305.5.2 Description of USIM........................................................................................................................ 305.5.2.1 “Normally Closed”SIM Circuit Design............................................................................ 305.5.2.2 “Normally Open” SIM Circuit Design.................................................................................315.5.3 USIM Design Points........................................................................................................................ 315.5.4 USIM Hot Plug..................................................................................................................................325.5.4.1 Hardware Connection..........................................................................................................325.5.4.2 Software Configuration........................................................................................................325.6 Digital Audio................................................................................................................................................. 325.6.1 Description of I2S Interface............................................................................................................335.6.2 Description of PCM Interface.........................................................................................................335.7 Android/Win8Dual System Switch Control Interface.............................................................................345.8 W_DISABLE# Interface............................................................................................................................. 345.8.1 Description of WWAN_DISABLE# Interface...............................................................................345.8.2 Description of GPS_DISABLE# Interface................................................................................... 355.9 TX_BLANKING Interface........................................................................................................................... 355.10 The WAKEUP_HOST Interface..............................................................................................................355.11 BODY_SAR Interface............................................................................................................................... 365.12 Description of I2C Interface.................................................................................................................... 365.13 Clock Interface.......................................................................................................................................... 365.14 Config Interface......................................................................................................................................... 365.15 RF Interface............................................................................................................................................... 375.15.1 Description of RF Connector....................................................................................................... 375.15.2 Description of RF Connecting Seat............................................................................................375.15.3 Main Performance of RF Connector.......................................................................................... 385.16 Other Interfaces........................................................................................................................................ 396 Electrical and Environmental................................................................................................................................ 406.1 Electrical....................................................................................................................................................... 406.2 Environmental..............................................................................................................................................407 RF Interface............................................................................................................................................................. 417.1 Operating Band........................................................................................................................................... 417.1.1 Antenna Band...................................................................................................................................417.2 RF PCB Design........................................................................................................................................... 417.2.1 Routing Principle..............................................................................................................................41
L831-EA Module Hardware User Manual Page9of437.2.2 Impedance Design...........................................................................................................................427.3 Antenna Design........................................................................................................................................... 427.3.1 Antenna Design Requirements..................................................................................................... 42
L831-EA Module Hardware User Manual Page10of431 Preface1.1 OutlineThe document outlines the electrical, RF performance, mechanical size and application environment ofL831-EA wireless module. Under the help of the document and others application notice, the applicationdeveloper could understand quickly the performance of L831-EA series wireless module, and developingthe product.1.2 StandardsThe products `reference design standard as listed below:3GPP TS 27.007 -v6.9.0: AT command set for User Equipment (UE)3GPP TS 27.005 -v6.0.1: Use of Data Terminal Equipment -Data Circuit terminating Equipment(DTE-DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)3GPP TS 23.040 -v6.9.0: Technical realization of Short Message Service (SMS)3GPP TS 24.011 -v6.1.0: Point- to - Point (PP) Short Message Service (SMS) support on mobileradio interface3GPP TS 27.010 -v6.0.0: Terminal Equipment to User Equipment (TE-UE) multiplexer protocol3GPP TS 27.060 -v6.0.0: Packet domain; Mobile Station (MS) supporting Packet Switched services3GPP TS 25.304-v6.10.0: User Equipment (UE) procedures in idle mode and procedures for cellreselection in connected mode3GPP TS 25.308 -v6.4.0: High Speed Downlink Packet Access (HSDPA); Overall description;Stage 23GPP TS 25.309 -v6.6.0: FDD enhanced uplink; Overall description; Stage 23GPP TS 23.038 -v6.1.0: Alphabets and language - specific information3GPP TS 21.111 -v6.3.0: USIM and IC card requirements3GPP TS 31.111 -v6.11.0 "USIM Application Toolkit (USAT)"3GPP TS 45.002 -v6.12.0: Multiplexing and multiple access on the radio path3GPP TS 51.014 -v4.5.0: Specification of the SIM Application Toolkit for the Subscriber IdentityModule - Mobile Equipment (SIM-ME) interface3GPP TS 51.010 -1 -v6.7.0: Mobile Station (MS) conformance specification; Part 1: Conformancespecification3GPP TS 22.004 -v6.0.0: General on supplementary services
L831-EA Module Hardware User Manual Page11of433GPP TS 23.090 -v6.1.0: Unstructured Supplementary Service Data (USSD); Stage 23GPP TS 24.008 v6.19, Mobile radio interface Layer 3 specification;3GPP TS 25.101 V7.18.0: User Equipment (UE) radio transmission and reception (FDD)3GPP TS 36.101 V9.18.0: User Equipment (UE) radio transmission and reception3GPP TS 36.104 V9.13.0: Base Station (BS) radio transmission and reception3GPP TS 36.106 V9.4.0: FDD Repeater radio transmission and reception3GPP TS 36.113 V9.5.0: Base Station (BS) and repeater ElectroMagnetic Compatibility (EMC)3GPP TS 36.124 V9.2.0: ElectroMagnetic Compatibility (EMC) requirements for mobile terminalsand ancillary equipment3GPP TS 36.133 V9.18.0: Requirements for support of radio resource management3GPP TS 34.121-1 version 7.2.0: The requirements and this test apply to all types of UTRA for theFDD UE3GPP TS 36.521-1 User Equipment (UE) conformance specification; Radio transmission andreception; Part 1: Conformance testing3GPP TS 34.122 V5.7.0: Technical Specification Group Radio Access Network; Radio transmissionand reception (TDD)3GPP TS 45.005 9.4.0: Digital cellular telecommunications system (Phase 2+);Radio transmissionand reception
L831-EA Module Hardware User Manual Page12of432 Introduction2.1 DescriptionL831-EA modules are highly integrated LTE M.2 wireless communication modules, supports 3 module 12band and the global main 4G/3G/2G modes (LTE FDD/WCDMA/GSM) These bands support the mobileoperators `cellular network of the Europe & Asia-Pacific and American marketing.2.2 SpecificationsSpecificationsBandsL831-EALTE FDD: Band 1,2,3,4,5,7,8,13,17,18,19,20WCDMA HSPA+: Band 1,2,4,5,8GSM/GPRS/EDGE: 850/900/1800/1900MHzDataLTE FDDCategory 4 (150Mbps DL,50Mbps UL)UMTS/HSDPA/HSUPA3GPP Rel.8DC-HSDPA 42Mbps(Cat24)/42Mbps(Cat20)HSUPA 11.5Mbps(Cat7)GSM 3GPP release 7EDGE (E-GPRS) multi-slot class 33(296kbps DL，236.8kbps UL)GPRS multi-slot class 33 (107kbps DL，85.6kbps UL)PhysicalDimension : 32mm x 42mm x 2.3 mmInterface : M.2Weight : 5.9 gramsEnvironmentOperating Temperature: -30℃~ +55℃Storage Temperature: -40℃~ +85℃PerformanceOperating VoltageVoltage：3.135V ~ 4.4V Normal：3.3VOperating Current(Typical Value)5.5mA (Sleep Mode)3G Idle：16mALTE FDD Idle: 17mALTE FDD DATA：700mAWCDMA Talk：580mA
L831-EA Module Hardware User Manual Page13of432G Talk：300mA (GSM PCL5)InterfacesRF InterfaceAntenna : Mainx1，Diversityx1Function Interface1 x USB 2.0，Multiple Profiles over USBSIM Support，I2C Support，I2S/PCM SupportGPIO，ClockData FeaturesProtocol StackEmbedded TCP/IP and UDP/IP protocol stackEDGEMulti-slot class 33 (5 Down; 4 Up; 6 Total)Coding Scheme MCS1~9GPRSMulti-slot class 33 (5 Down; 4 Up; 6 Total)Coding Scheme MCS1~4CSDUMTS(14.4kbps)，GSM(9.6kbps)USSDSupportSMSMO / MT Text and PDU modesCell broadcastAudioDigital AudioVoice coders :EFR/HR/FR/AMRVoLTE (not support yet）Audio ControlGain controlCharacter SetIRA，GSM，UCS2，HEXAT commandsFIBOCOM proprietary AT commandsGSM 07.05GSM 07.07AccessoriesFirmware Loader Tool over USBUser ManualDeveloper Kit
L831-EA Module Hardware User Manual Page14of43Note:1. Please make sure the temperature for device will not be higher than 55˚C.2. The minimum distance between the user and/or any bystander and the radiating structure of thetransmitter is 20cm.3. Assessment of compliance of the product with the requirements relating to the Radio andTelecommunication Terminal Equipment Directive (EC Directive 1999/5/EC) was performed byPHOENIX TESTLAB (Notified Body No.0700),
L831-EA Module Hardware User Manual Page15of432.3 AppearanceThe following pictures show the L831-EA wireless module.Top view:Figure 2- 1 Top ViewBottom view:Figure 2- 2 Bottom View
L831-EA Module Hardware User Manual Page16of433 Mechanical3.1 DimensionFigure3- 1Dimension Diagram
L831-EA Module Hardware User Manual Page17of433.2 Application Interface DescriptionL831-EA module uses 75-pin gold fingers as the external interface, the size of the module please refer tothe section3.1.As shown in Figure 4-2, L831-EA module uses the 75-pin fingers interface (67pin is the signal interfaceand Pin8 is notch).About the naming rules of M.2, L831-EA adopts the Type 3042-S3-B (30mmx42mm,the maximumthickness of element layer of Top surface is 1.5mm, the thickness of PCB is 0.8mm, Key ID is B).
L831-EA Module Hardware User Manual Page18of433.3 M.2 ConnectorRecommend to use the M.2 connector from LOTES, the type is APCI0026-P001A,the package ofconnector design please refer to the relevant specifications.As shown in Figure 3-2:Figure 3-2 Size of APCI0026-P001A M.2 connector
L831-EA Module Hardware User Manual Page19of434 Hardware Overview4.1 Pins Definition4.1.1 Pins NumberCONFIG_27574+3.3VGND7372+3.3VGND7170+3.3VCONFIG_16968CLK32KRESET#6766SIM_DETECTANTCTL36564NCANTCTL26362NCANTCTL16160NCANTCTL05958NCGND5756NCNC5554NCNC5352NCGND5150NCNC4948TX_BLANKINGNC4746SYSCLKGND4544GNSS_IRQNC4342GNSS_SDANC4140GNSS_SCLGND3938NCSSIC-TXP/USB3.0-TX+(NC)3736UIM_PWRSSIC-TXN/USB3.0-TX-(NC)3534UIM_DATAGND3332UIM_CLKSSIC-RXP/USB3.0-RX+(NC)3130UIM_RESETSSIC-RXN/USB3.0-RX-(NC)2928I2S_WAGND2726W_DISABLE2#DPR2524I2S_RXWOWWAN#2322I2S_TXCONFIG_02120I2S_CLKNotchNotchNotchNotchNotchNotchNotchNotchGND1110LED1#(3.3V)USB D-98W_DISABLE1#(3.3V)USB D+76FUL_CARD_POWER_OFF#(1.8V)GND54+3.3VGND32+3.3V
L831-EA Module Hardware User Manual Page20of43CONFIG_31Figure4- 2 Pins Definition (Top View)4.1.2 Pins DescriptionThe description of L831-EA pins as listed below:Pin#NameI/OResetValueIdleValueDescription1CONFIG_3OLLThe internal connects with GND, theinterface type of L831-EA module isWWAN-SSIC0.2+3.3VPIThe main power input, the voltagerange is: 3.135V ~ 4.4V3GNDGND4+3.3VPIThe main power input, the voltagerange is: 3.135V ~ 4.4V5GNDGND6FUL_CARD_POWER_OFF#IPUPUOff control signal，the internal 200Kohm will be pulled down, CMOS 1.8V7USB D+I/OUSB 2.0 signal+8W_DISABLE1#IPUPUWWAN Disable, Low active, CMOS3.3V9USB D-I/OUSB 2.0 signal-10LED1#OODODSystem status LED，drain output, lowlevel is available, CMOS 3.3V11GNDGND12NotchNotch13NotchNotch14NotchNotch15NotchNotch16NotchNotch17NotchNotch18NotchNotch19NotchNotch20I2S_CLKOTTI2S serial clock，CMOS 1.8V21CONFIG_0ONCNCNC，the interface type of L831-EA
L831-EA Module Hardware User Manual Page21of43module is WWAN-SSIC022I2S_RXOTTI2Sserial data output, CMOS 1.8V23WOWWAN#OPUPUThe module wake up the Host devicesignal，low level is available，CMOS1.8V.24I2S_TXITTI2Sserial data input, CMOS 1.8V25DPRIBody SAR Detect，CMOS 1.8V26W_DISABLE2#IPUPUGPS Disable signal, low level isavailable, CMOS 1.8V (not supportyet).27GNDGND28I2S_WAOTTI2S left/right channel clock signal,CMOS 1.8V29SSIC-RXN/USB3.0-RX-(NC)NC30UIM_RESETOPPPPReset signal of USIM card.31SSIC-RXP/USB3.0-RX+(NC)I/ONC32UIM_CLKOPPPPClock signal of USIM card.33GNDGND34UIM_DATAI/OPUPUData signal of USIM card. theinternal 4.7K resistance will be pulledup.35SSIC-TXN/USB3.0-TX-(NC)NC36UIM_PWROPower output of SIM card, 1.8V/3.0V37SSIC-TXP/USB3.0-TX+(NC)NC38NCNC39GNDGND40GNSS_SCLOPUPUI2C serial data signal clock, theinternal 4.7K resistance will be pulledup, CMOS 1.8V.41NCNC42GNSS_SDAI/OPUPUI2C serial data signal data, theinternal 4.7K resistance will be pulledup, CMOS 1.8V
L831-EA Module Hardware User Manual Page22of4343NCNC44GNSS_IRQIPUPUThe switch interrupt signal ofWin8/Android system.45GNDGND46SYSCLKOLL26MHz clock output.47NCNC48TX_BLANKINGOLLGSM TDMA Timer output signal, theGPS control signal, CMOS 1.8V49NCNC50NCNC51GNDGND52NCNC53NCNC54NCNC55NCNC56NCNC57GNDGND58NCNC59ANTCTL0OTunable antenna control signalGPO,CMOS 1.8V (not support yet)60NCNC61ANTCTL1OLLTunable antenna control signal, MIPIRFFE SDATA, CMOS 1.8V (notsupport yet)62NCNC63ANTCTL2OLLTunable antenna control signal, MIPIRFFE SCLK, CMOS 1.8V (notsupport yet)64NCNC65ANTCTL3OTunable antenna control signal, MIPIRFFE VIO, CMOS 1.8V (not supportyet)66SIM_DETECTIPUPUSIM Detect，CMOS 1.8V,390K ohm
L831-EA Module Hardware User Manual Page23of43will be pulled up.67RESET#IPUPUExternal reset signal input, CMOS1.8V68CLK32KO32KHz clock output.69CONFIG_1OLLThe internal connects with GND, theinterface type of L831-EA module isWWAN-SSIC0.70+3.3VPIThe main power input, the voltagerange is : 3.135V ~ 4.4V71GNDGND72+3.3VPIThe main power input, the voltagerange is : 3.135V ~ 4.4V73GNDGND74+3.3VPIThe main power input, the voltagerange is : 3.135V ~ 4.4V75CONFIG_2OLLThe internal connects with GND, theinterface type of L831-EA module isWWAN-SSIC0.Note :put the pins not used in circuit design NC directly.PI：Power InputH：High Voltage LevelL：Low Voltage LevelPD：Pull-DownPU：Pull-UpT：TristateOD：Open DrainPP：Push-Pull
L831-EA Module Hardware User Manual Page24of435 Hardware Interface5.1 Power Interface5.1.1 Power SupplyL831-EA module requires a 3.135V~ 4.4V DC power supply to provide the maximum GSM emissioncurrent with 2A.Input power supply requirements as listed below:ParametersMinimumRecommendedMaximumUnit+3.3V3.1353.34.4VNote:1. The ripple of Power supply must be lower than 200mV.2. The minimum value of power supply voltage drops shall more than 3.135V.The filter capacitor design of the supply circuit is as follows:RecommendedcapacitorApplicationDescription330uFSupply capacitorReduce power wave in call. Thevalue of capacitor is bigger better.1uF,100nFDigital signal noiseFiltering interference from clock anddigital signal.39pF,33pF700/850/900 MHz bandFiltering the RF reference.18pF,8.2pF,6.8pF1700/1800/1900,2100,2500/2600MHz bandFiltering the RF reference.5.1.2 VSD2_1V8VSD2_1V8 is the digital part circle`s` power supply within the module, VSD2_1V8 can use for the indexsignal and the reference level. With the circle design only use for external low current application（<50mA）, and floating it if not use.ParametersMinimumRecommendedMaximumUnitVSD2_1V81.71351.81.8865VVIH0.7* VSD2_1V81.81.8865VVIL-0.300.3* VSD2_1V8V
L831-EA Module Hardware User Manual Page25of435.2 Power on/off and Reset SignalL831-EA wireless module supports 2 control signals for the modules` power on/off and the resetoperation.The definition of the pins as listed below:Pin#Pin NameElectrical LevelDescription6FUL_CARD_POWER_OFF#CMOS 1.8VPower on/off signal67RESET#CMOS 1.8VExternal reset signal input.5.2.1 Power on/off Signal5.2.1.1 Power onClients can pull up the FUL_CARD_POWER_OFF# signal while the module is power on, then the modulewill turn on.The Pulse Timing requirements as listed below:ParametersConditionMinimumTypicalMaximumUnitPulse WidthPower on20100msThe Figure5- 1 shows the power_on timing control:Figure5- 1 Power_on Timing Control5.2.1.2 Power offL831-EA module supports two powers off modes. Through the software modes to turn off the module ingeneral condition. If the system halted or happen exceptions, use the following hardware modes to turn
L831-EA Module Hardware User Manual Page26of43off it, pull down the FUL_CARD_POWER_OFF# or floating. For details as listed below:Off modesMethodsConditionSoftwareSend AT+CPWROFF commands.Normal power_offHardwarePull down the FUL_CARD_POWER_OFF#or floating.Only used for system halted or happensexceptions and the software modes cannot be used.The description of hardware power_off as follows ( Pull down the FUL_CARD_POWER_OFF# orfloating ):While pulling down the FUL_CARD_POWER_OFF# signals or floating, the modules` PMU (PowerManagement Unit) will be reset, then the module will get into off modes from working modes.Note ①: the RESET_N signal must be pulled down before pulling down the FUL_CARD_POWER_OFF#signal, and then the module will be turned off safely.The Pulse Timing requirements as listed below:ParametersConditionMinimumTypicalMaximumUnitPulse WidthPower off5100msThe Figure 5- 2 shows the power off timing control:Figure5- 2 Power off Timing Control5.2.1.3 Recommended Circuit Design of Power on/off signalsThe recommended design of FUL_CARD_POWER_OFF# signal as follows:
L831-EA Module Hardware User Manual Page27of43Figure 5- 3 the recommended design of FUL_CARD_POWER_OFF# signal5.2.2 RESET SignalL831-EA wireless module supports external reset function. The module can back to initial state throughReset _N signal.While the RESET# signal is active low and keep 100ms, the module will reset and restart. The internalPMU cannot power cut while the clients execute the RESET function.Note: Reset signal is sensitive signal line , while PCB layout, please keep it away from RF interference,add the surrounding processing and recommend to decouple capacitor near the module. Don’t layout theReset signal in PCB edge or surface to avoid ESD causing system reset.The requirements of Pulse Timing as listed below:ParametersConditionMinimumTypicalMaximumUnitPulse WidthReset71001000msThe recommended design as follows:Figure5- 4 Recommended design of RESET# circuit
L831-EA Module Hardware User Manual Page28of435.3 Index Signal5.3.1 Index Signal PinsL831-EA module used for providing drain output signal and indicate RF condition:Pin #NameDescription10LED1#Close or open the condition indication of RF network, CMOS 3.3VThe condition description of LED1# signal as listed below :No.ConditionLED1#1RF openLow level2RF closedHigh levelThe recommended design as follows:Figure5- 5 Recommended design of LED condition index5.4 USB Interface5.4.1 Definition of USB InterfacePin NoPin NameI/ODescription7USB_DPI/OUSB signal+8USB_DMI/OUSB signal-L831-EA wireless module supports USB 2.0. It should be installed USB driver before using on PC.While L831-EA wireless module plugged into the PC, the USB interface with the drive can map 3 COMports and 4 NCM ports at PC end of Windows system, and for details as listed below:Two COM ports for sending AT Commands.One COM port for tracing LOG information.Four NCM ports are VLAN ports, mainly used for initiating data services .Note: The COM port can used as Modem COM port and initiate data services. But cause of the speed of
L831-EA Module Hardware User Manual Page29of43Modem COM port is so slow, and cannot up to 100Mbpss, the uplink requirements of LTE. So it is notsuggested. The Modem COM can be used to initiate data services temporarily only while the client`s NCMport is useless.5.4.2 Application for USB InterfaceThe recommended circuit design as follows:Figure5- 6 Recommended circuit design of USB interfaceT101 and T102 shall choose the TVS pipes witch less than 1pF.VUSB supply power has connected within the module, so the VBUS pin of Host end can float.USB_D+ and USB_D- is high speed differential signal line , the highest transmit speed is up to480Mbps.Not the following requirements while PCB Layout:USB_DP+ and USB_D- signal lines request with the same length, parallel, and try to avoid rightangle routing.Around the USB_DP +and USB_D- signal lines should be packaged with GND.Put the USB2.0 differential signal lines in the signal layer while are nearest to the ground.USB signal lines shall far away from strong interference signals, like power supply.Do the impedance matching, the impedance requests 90 ohm.5.5 USIM InterfaceL831-EA wireless module supports USIM and high speed SIM card, and does not supports 8-wire smartUSIM yet.
L831-EA Module Hardware User Manual Page30of435.5.1 USIM PinsPin#NameTypeDescription36UIM_PWROUSIM power supply signal30UIM_RESETOUSIM Reset signal32UIM_CLKOUSIM clock signal34UIM_DATAI/OUSIM data signal66SIM_DETECTIThe detection signal for SIM insettingThe default is 390K ohm resistance pulled up andinput.High level: SIM is present.Low level: SIM is absent5.5.2 Description of USIM5.5.2.1 “Normally Closed”SIM Circuit DesignReferenced Circuit Design:Figure5- 7 Reference Design of “Normally Closed” SIM Card InterfaceNormally closed SIM Connector:1）Pull out SIM card, pin 7 and pin 8 short-circuit .2）Insert SIM card, pin 7 and pin 8 disconnect.
L831-EA Module Hardware User Manual Page31of435.5.2.2 “Normally Open” SIM Circuit DesignReferenced Circuit Design:Figure5- 8 “Reference Design of “Normally open” SIM Card InterfaceNormally Open SIM Connector:1）Pull out SIM card, pin 7 and pin 8 disconnect.2）Inset SIM card, pin 7 and pin 8 short-circuit .Note:For improving EMC performance, SIM card connector should be closed to the module.For improving the anti-jamming capability of SIM card, please choose the SIM card socket withmasking function.Filtering capacitor on SIM card should be closed to SIM card pin.SIM card signal need add ESD protection (just like TVS pipe), ESD components should be closed toSIM card pin.SIM_CD signal connection supports hot plug, default high level is available (switch to low level isavailable through AT commands). If high level is detected, it means the SIM card is inserted.5.5.3 USIM Design PointsThe design of SIM interface is very important to its own normal working and the module.There are several design guidelines that must be followed:The layout and routing of SIM card should be away from EMI interference source , such as RFantenna and digital switching signals.To ensure signal integrity, the routing length between module and SIM card should not exceed100mm.To avoid mutual interference, the routing of UIM_CLK and UIM_DATA signal shall keep separate.
L831-EA Module Hardware User Manual Page32of43The signal lines of SIM cards shall do some ESD protection , and it request to choose the ESDprotected components with low capacitance, such as Zener diode. Recommend the clients to use theESD components and the equivalent capacitance shall be less than 33pF. ESD components shallnear to SIM card interfaces while layout.5.5.4 USIM Hot PlugL831-EA module supports the status detection function, and this function can realize hot plug of SIMcard .5.5.4.1 Hardware ConnectionThe hot plug function of SIM card needs the cooperation of SIM_DETECT signal.SIM_DETECT is low level while no SIM card; SIM_DETECT is high level while installing SIM card.Principle description:1）For “normally closed” SIM card, as shown in Figure 5-7.SIM_DETECT signal connects Pin8 (SW2) ofU2, pull down the Pin7 (SW1) to GND. SW2 and SW1 short-circuit while SIM card is not inserted, soSW2 is low level. SW1 and SW2 disconnect while SIM card installed, SIM_DETECT is pulled high.2）For “normally open“SIM card, as shown in Figure 5-8. SIM_DETECT signal connects Pin8 (SW2) ofU2 and pull down to ground through 47Kohm resistance. Pin 7 (SW1) shall be pulled upwith4.7Kohms. SW2 and SW1 is disconnected while SIM card is not inserted, so SW2 is low level.SW1 and SW2 is short-circuiting while SIM card installed, SIM_DETECT is pulled high.5.5.4.2 Software Configuration“+MSMPD” is used for setting the state detection of SIM card.AT+MSMPD=0, state detection function of SIM card is closed. The module does not detect theSIM_DETECT signal.AT+MSMPD=1, state detection function of SIM card is open. Detect the SIM card if installing or notthrough the SIM_DETECT Pin .SIM_DETECT is high level, SIM card is installed, and the module registers the network automatically.SIM_DETECT is low level, SIM card is not inserted, and the module does not register the network.Note: The parameters of “+MSMPD” is “1” by default. SIM_DETECT is the detection signal. While themodule first power on or plug after that, SIM_DETECT will detect if the SIM card is existing or not. Justonly if the SIM_DETECT is low level, the module will cannot read SIM card.5.6 Digital AudioL831-EA supports digital audio I2S interface.12S interface can support normal I2S modes and datatransmission of PCM modes. The level of I2S interface signal is 1.8V.
L831-EA Module Hardware User Manual Page33of43The description of I2S signal as listed below:Pin#NameTypeDescription20I2S2_CLKOBit clock28I2S2_WA0OLeft- right clock (LRCK)22I2S2_TXOSerial data output24I2S2_RXISerial data input5.6.1 Description of I2S InterfaceL831-EASignal DirectionAudio CODEC I2S PortI2S_CLKI2S_CLKI2S_WAI2S_LRCKI2S_RXI2S_SDOUTI2S_TXI2S_SDINNote:I2S interfaces can be configured to master or slave modes .It supports various audio sample rates (48KHz, 44.1KHz, 32KHz, 24KHz, 22.5KHz, 16KHz, 12KHz,11.025KHz, 8KHz).5.6.2 Description of PCM InterfaceL831-EASignal DirectionAudio CODEC PCM PortI2S_CLK0(PCM_CLK，PCM clock signal)PCM_CLK (PCM clock signal)I2S_WA0(PCM_SYNC，PCM framesynchronization signal)PCM_SYNC (PCM framesynchronization signal )I2S_RX(PCM_DIN，PCM data input)PCM_DOUT (PCM data output)I2S_TX(PCM_DOUT，PCM data output)PCM_DIN (PCM data input)Description:PCM interfaces can be configured to master or slave modes.Supports short frame synchronization under16 bit, 32bit, 48bit and 64bit modes.Supports sending data in burst modes and continuous modes.Supports clock length of frame synchronization signal and rising edge/ falling edge trigger
L831-EA Module Hardware User Manual Page34of43configuration of data transmission.Supports various audio sample rates (48KHz,44.1KHz,32KHz, 24KHz,22.5KHz,16KHz,12KHz,8KHz,11.025KHz).Note: Cause the timing of I2S modes is easier than PCM modes and easier to fit, recommend clients touse transmission audio of I2S mode. While transmission with PCM modes, the PCM timing sequence isdifficult to fit to make the tone quality become bad.5.7 Android/Win8Dual System Switch Control InterfaceL831-EA module supports Win8/Android dual system switch, check and achieve the dual system switchthrough interrupt signal ”GNSS_IRQ”.Pin#NameI/ODescription44GNSS_IRQIWin8/Android dual system switch detection signal,CMOS 1.8VThe function definition of GNSS_IRQ signal as listed below:No.GNSS_IRQFunction1High/FloatingSupport Win8 system, the module`s USB ports shall set as MBIM modes.2LowSupport Android system, the module`s `USB ports shall set as3ACM modes.Description:1. Check and achieve the Win8/Android system switch through GNSS_IRQ level when the modulepower on. Keep the GNSS_IRQ level stability during booting.2. Check and achieve the Win8/Android system switch through GNSS_IRQ rising edge/ falling edgewhile the module power on, the de-bouncing time sets as 100ms. The module will reboot aftermeeting the requirements and can switch different system supports.5.8 W_DISABLE# Interface5.8.1 Description of WWAN_DISABLE# InterfaceL831-EA module provides through hardware to open/close the WWAN RF function signal, this functioncan also controlled by AT commands.Pin#NameI/ODescription8W_DISABLE1#IWWAN open/close signal ,CMOS 3.3VThe definition of W_DISABLE# signal as listed below:
L831-EA Module Hardware User Manual Page35of435.8.2 Description of GPS_DISABLE# InterfaceL831-EA module provides through hardware to open/close GPS function signal, this function can alsocontrol by AT commands.Pin#NameI/ODescription26W_DISABLE2#IGPS open/close signal , and thesignal with 1.8VThe definition of GPS_DISABLE# signal as listed below:No.GPS_DISABLE#Description1LowGPS closed2HighGPS open3FloatingThe function of GPS defined by AT commands, keeps open by default.Note: this function don`t support yet.5.9 TX_BLANKING InterfaceOutput low level by default, the TX_BLANKING output the pulse signal that synchronized with GSM bursttiming while the module works in GSM band. Cause GSM transmitting may interfere the receiving of GPSsignal, close GPS or stop the data receiving of GPS while AP detected TX_BLANKING pulse signal.Pin#NameI/ODescription48TX_BLANKINGOExternal GPS control signal5.10 The WAKEUP_HOST InterfaceThe module supports the WAKEUP_HOST function, the pin is high level by default, but it outputs low levelwhile awaking Host.Pin#NameI/ODescription23WOWWAN#OThe module wakes up Host signal with 1.8V，and lowlevel is available.No.W_DISABLE#Function1LowWWAN closed2HighWWAN opened3FloatingThe function of WWAN defined by AT commands , and keep open bydefault .
L831-EA Module Hardware User Manual Page36of435.11 BODY_SAR InterfaceL831-EA module supports BODY_SAR (DPR pin) function.BODY_SAR is input signal (the signal is output directly by the AP end), with high level by default, and lowlevel is effectively. While the human nearing, AP can detect it through the distance sensor, then output theBODY_SAR signal with low level. While the module detected the signal through the interruption, themodule `s Tx power will be reduced and the threshold value can be set by the AT commands.Pin#NameI/ODescription25DPRIBODY_SAR detection5.12 Description of I2C InterfaceL831-EA module supports one 12C interface, default configuration is I2C master. The I2C can used fordriving external 12C slave device, such as Audio codes and so on.Pin#NameI/ODescription42GNSS_SDAI/OI2C control signal input/output ,1.8V signal40GNSS_SCLOI2C control clock signal, 1.8V signalThe signal connection between L831-EA module and external 12C slave device ( such as Audio Codec）as listed below:L831-EADirectionAudio Codec I2C PortGNSS_SDAI2C_SDAGNSS_SCLI2C_SCL5.13 Clock InterfaceL831-EA module supports one 26MHz clock output and one 32KHz clock output.Pin#NameI/ODescription68CLK32KO32K clock output ,46SYSCLKO26Mclock output , (recommend used for external GPS, and canalso used as audio codec`s MCLK)5.14 Config InterfaceL831-EA module provides four config pins and with the configuration of WWAN-USB3.0-0.PIN#NameI/ODescriptionValue
L831-EA Module Hardware User Manual Page37of431CONFIG_3OConnect to GND within the module021CONFIG_0ONC-69CONFIG_1OConnect to GND within the module075CONFIG_2OConnect to GND within the module0The configuration of M.2 Socket 2 Module as listed below :Config_0(pin21)Config_1(pin69)Config_2(pin75)Config_3(pin1)Module Type and MainHost InterfacePort ConfigurationGNDGNDGNDGNDSSD-SATAN/AGNDGNDN/CGNDWWAN-PCIeN/AGNDGNDGNDN/CWWAN-USB3.005.15 RF Interface5.15.1Description of RF ConnectorL831-EA module provides two RF connector for the connection of external antenna , the MAIN means themain antenna of RF, and DIV means the diversity antenna .Figure 5-9 RF connectors Diagram5.15.2Description of RF Connecting SeatL831-EA module adopts the RF connecting seat with Murata MM4829-2702, the size is 2*2*0.6mm, andthe structure diagram as follows:
L831-EA Module Hardware User Manual Page38of43Figure 5-10 Structure diagram of RF connecting seatFigure 5-11 0.81mm coaxial lineFigure 5-12 RF connector insert into RF connecting seat5.15.3Main Performance of RF ConnectorRated conditionsEnvironment condition
L831-EA Module Hardware User Manual Page39of43Frequency rangeDC to 6GHzTemperature range :Characteristic impedance50Ω–40°C to +85°C5.16 Other InterfacesThe following interfaces are not supported now: GPIO and Tunable ANT.
L831-EA Module Hardware User Manual Page40of436 Electrical and Environmental6.1 ElectricalThis table shows the electrical features range of L831-EA module.ParameterMinimum ValueMaximum ValueUnitPower supply04.4VDigital Signal01.9V6.2 EnvironmentalThis table shows the environmental features of L831-EA moduleParameterMinimum ValueMaximum ValueUnitOperational Temperature-30+55°CStorage Temperature-40+85°C
L831-EA Module Hardware User Manual Page41of437 RF Interface7.1 Operating Band7.1.1 Antenna BandOperatingBandDescriptionModeTx (MHz)Rx (MHz)Band 1IMT 2100MHzLTE FDD/WCDMA1920 - 19802110 - 2170Band 2PCS 1900MHzLTE FDD/WCDMA/GSM1850 - 19101930 - 1990Band 3DCS 1800MHzLTE FDD/GSM1710 - 17851805 - 1880Band 4AWS 1700MHzLTE FDD1710 - 17552110 - 2155Band 5CLR 850MHzLTE FDD/WCDMA/GSM824 - 849869 - 894Band 7IMT-E 2600MhzLTE FDD2500 - 25702620 - 2690Band 8E-GSM 900MHzLTE FDD/WCDMA/GSM880 - 915925 - 960Band 13US 700MHz blocks CLTE FDD777 - 787746 - 756Band 17US 700MHz blocks B/CLTE FDD704 - 716734 - 746Band 18Japan 850MHzLTE FDD815 – 830860 – 875Band 19Japan Extend 850MHzLTE FDD830 – 845875 – 890Band 20EUDD 800MHzLTE FDD832 - 862791 - 8217.2 RF PCB Design7.2.1 Routing PrincipleL831-EA module adopts double RF antennas, the MAIN_ANT used for transmitting and receiving, theDIV_ANT used for receiving. On the one hand, diversity antenna can improve the receiving sensitivity; onthe other hand, it can also improve the download speed. Because the L831-EA module belong to LTEmodule, the Antenna need double antennas can meet the performance requirements.
L831-EA Module Hardware User Manual Page42of437.2.2 Impedance DesignThe impedance of RF signal lines should be controlled within 50ohm.7.3 Antenna Design7.3.1 Antenna Design Requirements(1) Antenna EfficiencyAntenna efficiency is the ratio of antenna input power to radiation power. Cause the return loss, materialloss, and coupling loss, the radiation power is always lower than the input power.Recommended value> 40% (–4dB)(2) S11 or VSWRS11 can indicates the 50ohm`s matched-degree of antenna .To some degree, it affects the antennaefficiency. It can measure the indicator through VSWR test, recommended value: S11 < –10 dB.(3) PolarizationThe antenna`s polarization means the rotate direction of electric field in the direction of the maximumradiation.Recommend to use linear polarization: it would be better if the polarization direction of diversity antenna isdifferent from main antenna.(4) Radiation PatternRadiation pattern is the antenna`s electromagnetic-field strength in all directions of far field .Half-wavedipole antenna is the most suitable terminal antenna.If it is built-in antenna, PIFA antenna is recommended:Antenna area (H x W x L): 6mm x 10mm x 100mm. PIFA or IFA antenna is recommended.Radiation Pattern: Omni-directional.(5) Gain and DirectionThe direction of the antenna is the electromagnetic field strength of the electromagnetic wave in alldirections. The gain is a collection of antenna efficiency and the direction of antenna.Recommended antenna gain≤ 3dBi(6) InterferenceBesides the antenna`s performance, the other interference on the PCB board can also affect themodule`s performance. To ensure the module`s high performance, we must have a good control to theinterference.Suggestions: such as the routing of Speak, LCD, CPU and FPC, the audio circuits and the power partshall try to keep away from the antenna. At the same time, note the corresponding isolation and shielding,
L831-EA Module Hardware User Manual Page43of43or do some filtering on the routing.（7）TRP/TISTRP (Total Radiated Power)：GSM850/900>28dBmGSM DCS1800/PCS1900 >25dBmWCDMA Band 1,2,4,5,8>19dBmLTE FDD Band 1,2,3,5,7,8,13,17,18,19,20 >19dBmTIS (Total Isotropic Sensitivity)：GSM850,GSM 900,DCS1800,PCS1900 <-102dBmWCDMA Band1,2,4,5,8<-102dBmLTE FDD Band1,2,3,5,7,8,13,17,18,19,20 <-95dBm (10MHz band width)

Navigation menu