5V Tolerant Inputs for 3.3V Modules

Appendix B – Product Approvals, Design Considerations, Regulatory Information

In order to drive the inputs of 3.3V modules from 5V logic, it is recommended to add a 1K series resistor to each of the inputs: TXD, RTS, DTR, and RESET.

SocketModem Global MT5634SMI Developer’s Guide

Page 83

Image 83

Technics MT5634SMI-34, MT5634SMI-92 manual 5V Tolerant Inputs for 3.3V Modules

Contents

MT5634SMI-34 MT5634SMI-92 Revisions Table of Contents Multi-Tech’s Flash Programming Protocol Appendix C Country Configuration and Result Codes Index Product Description Product Description SpecificationsIntroduction MT5634SMI Features Matrix TIA/EIA TR29.2 Technical Specifications and Features Standard MT5634SMI-IT-92 Industrial Temperature 3.3V Build Option Physical Dimensions All Models Mechanical Specifications Digital Ground Pin ConfigurationsPin # Signal Name I/O Type Description Active High RDX status Tip Signal from TelcoRing Signal from Telco Active High DCD status VCC PWR Pin # Signal Description NameDgnd GND INT Electrical Characteristics Electrical Characteristics Timing Requirements for Parallel Read Handling PrecautionsTiming Requirements Timing Requirements for Parallel Write SocketModem Mimic MMM Operation SocketModem Parallel Interface a Programmer’s DescriptionSocketModem Parallel Interface Internal Registers Register Name Register Description Host Access Special Register Set Note *2 Time Out InterruptsRegister Functional Descriptions Internal Registers THR Transmit Holding Register TX Fifo IER Interrupt EnableBit Priority Interrupt Source Interrupt Reset Control RBR Receive Buffer RX Fifo MCR Modem Control FCR Fifo ControlLCR Line Control MSR Modem Status LSR Line Status Baud Rate Clock Divisor Decimal DLM Value HEX DLL Value HEX SCR ScratchDLL Divisor Latch LSByte DLM Divisor Latch MSByte AT Command Summary AT Commands, S-Registers Result Codes Set Register Value Modulation Handshake DS= y Dial Stored Telephone Number AT CommandsEnter Key Dial string modifiers Return Online to Data Mode Sr? Sr= n Set Register Value XON/XOFF Pacing Control \Bn Transmit Break Zy=x Store Dialing Command\An Select Maximum MNP Block Size Data mode. The modem receives the break from the computer \Nn Error Correction Mode Selection\Tn Inactivity Timer \Kn Break Control \Xn XON/XOFF Pass-Through DCn AT Command Control $MBn Online BPS Speed $RPn Ring Priority vs. AT Command Priority$Dn DTR Dialing $EBn Asynchronous Word Length #CBNy=x Store Callback Password #CBDn Callback DelayCallback Failed Attempts Reset #CBIn Local Callback Inactivity Timer Escape AT Commands Modulation Possible rates bps1 Commands+MS= Modulation Selection Subparameters +PIG=n PCM Upstream Ignore +PCW=n Call Waiting Enable+PMH=n Modem on Hold Enable Mod value Valid maxrate values bps +PMHR=n Modem on Hold Initiate +PMHT=n Modem on Hold Timer+PMHF V.92 Modem Hook Flash +VCID=n Caller ID Selection +PQC=n Quick Connect Control #S=x Store Setup Password #Sx Enter Setup Password Registers Register Unit Range Default Description S48=7 S48=128 S38 Terse Verbose Description Result Codes 111 Voice Commands Voice S-Register Summary Voice CommandsCommands That Change for Voice Mode Support +FCLASS= mode Enter Select Modem Operating Mode Voice +V Commands SummaryVoice +V Commands Detail Command Description +FCLASS=8 Dtmf Detect Detect and Control Dtmf Touch Tone Signals Digit Low frequency High frequencyAT+FCLASS=? Enter Display Service Class Capabilities +FMR?Enter Report Version Level +VNH=hookEnter Automatic Hang-Up Control+FMI?Enter Report Manufacturers ID +FMM?Enter Report Product ID Enter Voice Receive State +VTS=string Produce Dtmf and Tone Generation in Voice Mode +VGR=gain Set the Gain for Received Voice Samples +VTS=? Report Frequency SupportAT+VTS=? Start Voice Transmission Process Code Description +VGT=level Set the Volume for Transmitted Voice Samples+VIT=timer Set DTE/DCE Inactivity Timer +VLS=label Select Analog Source/Destination +VRA=interval Set Ring Back Goes Away Timer +VSM=cml,vsr,scs,sel Select Voice Compression Method +VRN=interval Set Ring Back Never Appeared Timer+VSD=sds,sdi Set Silence Detection Sensitivity Identifier Description +VSM=? Report Voice Compression MethodAT+VSM=? Lsltcq Enable Report Description+VDT=enable,report Control Tone Cadence Reporting +VEM=? Report Event Reporting and Masking Capabilities +VEM=mask Event Reporting and Masking AT+VBT=? Interface Configuration Commands+VPP=enable Enable or Disable Voice Mode Packet Protocol +VBT=? Report Modem Flow Control Assert and Deassert Points +VPR=rate Select DTE/DCE Interface Rate Turn Off Autobaud Voice Mode Result CodesFlow Control Tag Description Unsolicited Voice Mode Result CodesValid Complex Event Report Tags Shielded Code Hex Event Report Description Voice Mode Shielded Codes Ascii Sample Rate Selection and Suggested Compression Method Command ResponseSample Sessions AT+VLS=0 AT+VLS=4AT+VTX DLE ETX AT+VNH=1 AT+VLS=2AT+VRX DLE NUL Additional Information DTE/DCE Interface RatesRelated Manuals Fax Commands Setup Remote Configuration Country Code ConfigurationRemote Configuration Basic Procedure Country AT Command Result Code Hexadecimal Decimal Country Code ConfigurationUsing the Global Wizard Utility Using AT Commands Upgrade Steps Firmware Upgrade ProcedureUpgrade Overview Identify the Current Version of the Firmware Download the Upgrade FileInstall the Flash Wizard Extract the Firmware Upgrade .Hex Files Restore Your Parameters Upgrade the Modem’s FirmwareUsing the Flash Wizard Handshake Sequence Multi-Tech Systems, Inc. Flash Programming ProtocolProgramming the Modem Modem Comments ATI4 Other Supported Boot Code CommandsOther Programming Concerns End of File Record Char Pos Field Type Value Description Intel Hex FormatData Record Char Pos Field Type Value Description Example Extended Address Record in Intel Format Example End of File in Intel Format Serial Test/Demo Board Components Appendix a Mechanical Details 5V / 3.3V Jumper JP1 Serial Test/Demo Board Block Diagram Operating Voltage Select Jumper JP4 Parallel Test/Demo Board ComponentsAddress/COM Port/ IRQ Select Jumpers JP2 and JP3 Figure A-4. Parallel Test/Demo Board Block Diagram Parallel Test/Demo Board Block Diagram Telecom Approvals Safety and EMC Approvals Hardware Considerations Regulatory Design Considerations Safety 5V Tolerant Inputs for 3.3V Modules Industry Canada FCC Part 15 Regulation Telecom Labeling Requirements FCC Part 68 Telecom Reregistration From FCC Part 68 Subpart D Conditions for Registration Canadian Limitations Notice Fax Branding Statement Multiple Listing EMC, Safety, and R&TTE Directive ComplianceIndustry Canada CS-03 International Modem Restrictions South African Notice New Zealand Telecom Warning Notice Country Country Config. hex ATI9 Response Appendix C Country Configuration Result Codes Appendix C Country Configuration and Result Codes Appendix C Country Configuration and Result Codes Appendix C Country Configuration and Result Codes Page Index Index Index Index