THALES DIS AlS Deutschland TC65 Quadband GSM/GPRS Module User Manual TC65

Gemalto M2M GmbH Quadband GSM/GPRS Module TC65

Contents

Users Manual 1 of 2

Hardware Interface Description TC65 Siemens Cellular Engine Version: 00.450 DocID: TC65_HD_V00.450 s
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 2 of 96 20.04.2005 Document Name: TC65 Hardware Interface Description Version: 00.450 Date: April 20, 2005 DocId: TC65_HD_V00.450 Status: Strictly confidential / Draft General note Product is deemed accepted by Recipient and is provided without interface to Recipient´s products. The Product constitutes pre-release version and code and may be changed substantially before commercial release. The Product is provided on an “as is” basis only and may contain deficiencies or inadequacies. The Product is provided without warranty of any kind, express or implied. To the maximum extent permitted by applicable law, Siemens further disclaims all warranties, including without limitation any implied warranties of merchantability, fitness for a particular purpose and noninfringement of third-party rights. The entire risk arising out of the use or performance of the Product and documentation remains with Recipient. This Product is not intended for use in life support appliances, devices or systems where a malfunction of the product can reasonably be expected to result in personal injury. Applications incorporating the described product must be designed to be in accordance with the technical specifications provided in these guidelines. Failure to comply with any of the required procedures can result in malfunctions or serious discrepancies in results. Furthermore, all safety instructions regarding the use of mobile technical systems, including GSM products, which also apply to cellular phones must be followed. Siemens AG customers using or selling this product for use in any applications do so at their own risk and agree to fully indemnify Siemens for any damages resulting from illegal use or resale. To the maximum extent permitted by applicable law, in no event shall Siemens or its suppliers be liable for any consequential, incidental, direct, indirect, punitive or other damages whatsoever (including, without limitation, damages for loss of business profits, business interruption, loss of business information or data, or other pecuniary loss) arising out the use of or inability to use the Product, even if Siemens has been advised of the possibility of such damages. Subject to change without notice at any time. Copyright Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its contents and communication thereof to others without express authorization are prohibited. Offenders will be held liable for payment of damages. All rights created by patent grant or registration of a utility model or design patent are reserved. Copyright © Siemens AG 2005
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 3 of 96 20.04.2005 Contents 0 Document History .........................................................................................................7 1 Introduction ...................................................................................................................8 1.1 Related Documents ...............................................................................................8 1.2 Terms and Abbreviations.......................................................................................9 1.3 Type Approval......................................................................................................12 1.4 Safety Precautions...............................................................................................14 2 Product Concept .........................................................................................................16 2.1 Key Features at a Glance ....................................................................................16 2.2 TC65 System Overview .......................................................................................19 2.3 Circuit Concept ....................................................................................................20 3 Application Interface...................................................................................................21 3.1 Operating Modes .................................................................................................22 3.2 Power Supply.......................................................................................................24 3.2.1 Minimizing Power Losses ......................................................................24 3.2.2 Measuring the Supply Voltage VBATT+ ....................................................25 3.2.3 Monitoring Power Supply by AT Command ...........................................25 3.3 Power Up / Power Down Scenarios.....................................................................26 3.3.1 Turn on TC65.........................................................................................26 3.3.1.1 Turn on TC65 Using Ignition Line IGT ...................................................26 3.3.1.2 Turn on TC65 Using the VCHARGE Signal...........................................28 3.3.1.3 Reset TC65 via AT+CFUN Command ...................................................29 3.3.1.4 Reset TC65 in Case of Emergency via EMERG_RST ..........................29 3.3.2 Turn off TC65.........................................................................................30 3.3.2.1 Turn off TC65 Using AT Command .......................................................30 3.3.2.2 Leakage Current in Power Down Mode .................................................31 3.3.3 Automatic Shutdown ..............................................................................32 3.3.3.1 Temperature Dependent Shutdown.......................................................32 3.3.3.2 Temperature Control during Emergency call .........................................33 3.3.3.3 Undervoltage Shutdown if Battery NTC is Present ................................33 3.3.3.4 Undervoltage Shutdown if no Battery NTC is Present ...........................34 3.3.3.5 Overvoltage Shutdown...........................................................................34 3.4 Automatic GPRS Multislot Class Change............................................................35 3.5 Charging Control..................................................................................................36 3.5.1 Hardware Requirements ........................................................................36 3.5.2 Software Requirements .........................................................................36 3.5.3 Battery Pack Requirements ...................................................................37 3.5.4 Batteries Recommended for Use with TC65..........................................38 3.5.5 Charger Requirements...........................................................................39 3.5.6 Implemented Charging Technique.........................................................39 3.5.7 Operating Modes during Charging.........................................................40 3.6 Summary of State Transitions (Except SLEEP Mode).........................................42 3.7 RTC Backup ........................................................................................................43 3.8 SIM Interface .......................................................................................................44 3.9 Serial Interface ASC0 ..........................................................................................45 3.10 Serial Interface ASC1 ..........................................................................................47 3.11 USB Interface ......................................................................................................48 3.11.1 Installing the USB Modem Driver...........................................................49 3.12 I2C Interface .........................................................................................................51 3.13 Audio Interfaces...................................................................................................53
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 4 of 96 20.04.2005 3.13.1 Speech Processing................................................................................54 3.13.2 Microphone Circuit.................................................................................54 3.13.2.1 Single-ended Microphone Input.............................................................54 3.13.2.2 Differential Microphone Input.................................................................55 3.13.2.3 Line Input Configuration with OpAmp ....................................................56 3.13.3 Loudspeaker Circuit...............................................................................57 3.13.4 Digital Audio Interface DAI.....................................................................58 3.14 Control Signals ....................................................................................................59 3.14.1 Synchronization Signal ..........................................................................59 3.14.2 Using the SYNC Pin to Control a Status LED........................................60 4 Antenna Interface........................................................................................................61 4.1 Antenna Installation .............................................................................................61 4.2 Antenna Pad ........................................................................................................63 4.2.1 Suitable Cable Types.............................................................................63 4.3 Antenna Connector..............................................................................................64 5 Electrical, Reliability and Radio Characteristics......................................................68 5.1 Absolute Maximum Ratings .................................................................................68 5.2 Operating Temperatures......................................................................................68 5.3 Pin Assignment and Signal Description...............................................................69 5.4 Power Supply Ratings .........................................................................................75 5.5 Electrostatic Discharge ........................................................................................77 5.6 Reliability Characteristics.....................................................................................78 6 Mechanics....................................................................................................................79 6.1 Mechanical Dimensions of TC65 .........................................................................79 6.2 Mounting TC65 to the Application Platform .........................................................81 6.3 Board-to-Board Application Connector ................................................................82 7 Sample Application.....................................................................................................85 8 Reference Approval ....................................................................................................87 8.1 Reference Equipment for Type Approval.............................................................87 8.2 Compliance with FCC Rules and Regulations.....................................................88 9 Appendix......................................................................................................................89 9.1 List of Parts and Accessories ..............................................................................89 9.2 Fasteners and Fixings for Electronic Equipment .................................................91 9.2.1 Fasteners from German Supplier ETTINGER GmbH ............................91 9.3 Data Sheets of Recommended Batteries ............................................................94
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 5 of 96 20.04.2005 Tables Table 1: Overview of operating modes................................................................................... 22 Table 2: Temperature dependent behavior ............................................................................ 33 Table 3: Specifications of battery packs suitable for use with TC65 ...................................... 38 Table 4: Comparison Charge-only and Charge mode............................................................ 41 Table 5: AT commands available in Charge-only mode......................................................... 41 Table 6: State transitions of TC65 (except SLEEP mode) .....................................................42 Table 7: Signals of the SIM interface (board-to-board connector) ......................................... 44 Table 8: DCE-DTE wiring of ASC0......................................................................................... 46 Table 9: DCE-DTE wiring of ASC1......................................................................................... 47 Table 11: Return loss in the active band ................................................................................61 Table 12: Product specifications of U.FL-R-SMT connector .................................................. 64 Table 13: Material and finish of U.FL-R-SMT connector and recommended plugs ...............65 Table 14: Ordering information for Hirose U.FL Series .......................................................... 67 Table 15: Absolute maximum ratings under non-operating conditions .................................. 68 Table 16: Operating temperatures ......................................................................................... 68 Table 17: Signal description...................................................................................................70 Table 18: Power supply ratings .............................................................................................. 75 Table 19: Current consumption during transmit burst ............................................................ 76 Table 20: Measured electrostatic values................................................................................77 Table 21: Summary of reliability test conditions ..................................................................... 78 Table 22: Technical specifications of Molex board-to-board connector .................................82 Table 23: List of parts and accessories..................................................................................89 Table 24: Molex sales contacts (subject to change) ..............................................................90 Table 25: Hirose sales contacts (subject to change)..............................................................90 Figures Figure 1: TC65 system overview............................................................................................ 19 Figure 2: TC65 block diagram ................................................................................................20 Figure 3: Power supply limits during transmit burst................................................................ 25 Figure 4: Position of the reference points BATT+ and GND .................................................. 25 Figure 5: Power-on with operating voltage at BATT+ applied before activating IGT.............. 27 Figure 6: Power-on with IGT held low before switching on operating voltage at BATT+ .......28 Figure 7: Signal states during turn-off procedure ...................................................................31 Figure 8: Battery pack circuit diagram....................................................................................37 Figure 9: RTC supply from capacitor...................................................................................... 43 Figure 10: RTC supply from rechargeable battery .................................................................43 Figure 11: RTC supply from non-chargeable battery .............................................................43 Figure 12: Serial interface ASC0............................................................................................ 45 Figure 13: Serial interface ASC1............................................................................................ 47 Figure 14: USB circuit ............................................................................................................48 Figure 15: I2C interface connected to VCC of application .....................................................51 Figure 16: I2C interface connected to VEXT line of TC65 ..................................................... 52 Figure 17: Audio block diagram.............................................................................................. 53 Figure 18: Single ended microphone input............................................................................. 54 Figure 19: Differential microphone input ................................................................................55 Figure 20: Line input configuration with OpAmp .................................................................... 56 Figure 21: Differential loudspeaker configuration...................................................................57 Figure 22: Single ended loudspeaker configuration............................................................... 57 Figure 25: SYNC signal during transmit burst ........................................................................ 59 Figure 26: LED Circuit (Example)...........................................................................................60
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 6 of 96 20.04.2005 Figure 27: Never use antenna connector and antenna pad at the same time ....................... 62 Figure 28: Restricted area around antenna pad..................................................................... 62 Figure 29: Mechanical dimensions of U.FL-R-SMT connector...............................................64 Figure 30: U.FL-R-SMT connector with U.FL-LP-040 plug ....................................................65 Figure 31: U.FL-R-SMT connector with U.FL-LP-066 plug ....................................................65 Figure 32: Specifications of U.FL-LP-(V)-040(01) plug .......................................................... 66 Figure 33: Pin assignment (component side of TC65) ........................................................... 69 Figure 34: TC65 – top view .................................................................................................... 79 Figure 35: Dimensions of TC65.............................................................................................. 80 Figure 36: Molex board-to-board connector 52991-0808 on TC65 ........................................ 83 Figure 37: Mating board-to-board connector 53748-0808 on application ..............................84 Figure 38: TC65 sample application (draft) ............................................................................86 Figure 39: Reference equipment for Type Approval .............................................................. 87 Figure 40: Lithium Ion battery from VARTA ...........................................................................95 Figure 41: Lithium Polymer battery from VARTA ................................................................... 96
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 7 of 96 20.04.2005 0 Document History Preceding document: "TC65 Hardware Interface Description" Version 00.302 New document: "TC65 Hardware Interface Description" Version 00.450 Chapter What is new Throughout manual IGT line needs to be driven low for at least 400ms 2.1 Updated description of I2C and SPI. 3.1 New chapter: Operating Modes 3.3.1 Added remarks on different operating modes. 3.3.3.3 Added remark on shutdown threshold in IDLE mode. 3.5.2 New chapter to describe requirements to control end of charging. 3.5.4 Updated recommended battery specifications. 3.5.7 Added remark on how to switch the module off when in Charging-only mode. 3.6 New chapter: Summary of State Transitions (Except SLEEP Mode) 3.12 More detailed description of AT^SSPI. 3.14.1 Updated forward time of SYNC signal during transmit burst. 5.2 Added remark on temperature tolerances. 5.3 Renamed pins of I2C and SPI. 5.4 Changed table “Current consumption during transmit burst”
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 8 of 96 20.04.2005 1 Introduction This document describes the hardware of the Siemens TC65 module that connects to the cellular device application and the air interface. It helps you quickly retrieve interface specifications, electrical and mechanical details and information on the requirements to be considered for integrating further components. 1.1 Related Documents [1] TC65 AT Command Set [2] TC65 Release Notes 00.450 [3] DSB75 Support Box - Evaluation Kit for Siemens Cellular Engines [4] Application 07: Rechargeable Lithium Batteries in GSM Applications (not yet available) [5] Multiplexer User's Guide (not yet available)
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 9 of 96 20.04.2005 1.2 Terms and Abbreviations Abbreviation Description ADC Analog-to-Digital Converter AGC Automatic Gain Control ANSI American National Standards Institute ARFCN Absolute Radio Frequency Channel Number ARP Antenna Reference Point ASC0 / ASC1 Asynchronous Controller. Abbreviations used for first and second serial interface of TC65 B Thermistor Constant B2B Board-to-board connector BER Bit Error Rate BTS Base Transceiver Station CB or CBM Cell Broadcast Message CE Conformité Européene (European Conformity) CHAP Challenge Handshake Authentication Protocol CPU Central Processing Unit CS Coding Scheme CSD Circuit Switched Data CTS Clear to Send DAC Digital-to-Analog Converter DAI Digital Audio Interface dBm0 Digital level, 3.14dBm0 corresponds to full scale, see ITU G.711, A-law DCE Data Communication Equipment (typically modems, e.g. Siemens GSM engine) DCS 1800 Digital Cellular System, also referred to as PCN DRX Discontinuous Reception DSB Development Support Box DSP Digital Signal Processor DSR Data Set Ready DTE Data Terminal Equipment (typically computer, terminal, printer or, for example, GSM application) DTR Data Terminal Ready DTX Discontinuous Transmission EFR Enhanced Full Rate EGSM Enhanced GSM EIRP Equivalent Isotropic Radiated Power EMC Electromagnetic Compatibility ERP Effective Radiated Power
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 10 of 96 20.04.2005 Abbreviation Description ESD Electrostatic Discharge ETS European Telecommunication Standard FCC Federal Communications Commission (U.S.) FDMA Frequency Division Multiple Access FR Full Rate GMSK Gaussian Minimum Shift Keying GPIO General Purpose Input/Output GPRS General Packet Radio Service GSM Global Standard for Mobile Communications HiZ High Impedance HR Half Rate I/O Input/Output IC Integrated Circuit IMEI International Mobile Equipment Identity ISO International Standards Organization ITU International Telecommunications Union kbps kbits per second LED Light Emitting Diode Li-Ion / Li+ Lithium-Ion Li battery Rechargeable Lithium Ion or Lithium Polymer battery Mbps Mbits per second MMI Man Machine Interface MO Mobile Originated MS Mobile Station (GSM engine), also referred to as TE MSISDN Mobile Station International ISDN number MT Mobile Terminated NTC Negative Temperature Coefficient OEM Original Equipment Manufacturer PA Power Amplifier PAP Password Authentication Protocol PBCCH Packet Switched Broadcast Control Channel PCB Printed Circuit Board PCL Power Control Level PCM Pulse Code Modulation PCN Personal Communications Network, also referred to as DCS 1800 PCS Personal Communication System, also referred to as GSM 1900 PDU Protocol Data Unit PLL Phase Locked Loop
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 11 of 96 20.04.2005 Abbreviation Description PPP Point-to-point protocol PSK Phase Shift Keying PSU Power Supply Unit R&TTE Radio and Telecommunication Terminal Equipment RAM Random Access Memory RF Radio Frequency RMS Root Mean Square (value) ROM Read-only Memory RTC Real Time Clock RTS Request to Send Rx Receive Direction SAR Specific Absorption Rate SELV Safety Extra Low Voltage SIM Subscriber Identification Module SMS Short Message Service SPI Serial Peripheral Interface SRAM Static Random Access Memory TA Terminal adapter (e.g. GSM engine) TDMA Time Division Multiple Access TE Terminal Equipment, also referred to as DTE Tx Transmit Direction UART Universal asynchronous receiver-transmitter URC Unsolicited Result Code USB Universal Serial Bus USSD Unstructured Supplementary Service Data VSWR Voltage Standing Wave Ratio Phonebook abbreviations FD SIM fixdialing phonebook LD SIM last dialing phonebook (list of numbers most recently dialed) MC Mobile Equipment list of unanswered MT calls (missed calls) ME Mobile Equipment phonebook ON Own numbers (MSISDNs) stored on SIM or ME RC Mobile Equipment list of received calls SM SIM phonebook
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 12 of 96 20.04.2005 1.3 Type Approval TC65 is designed to comply with the directives and standards listed below. Please note that the product is still in a pre-release state and, therefore, type approval and testing procedures have not yet been completed. European directives 99/05/EC “Directive of the European Parliament and of the council of 9 March 1999 on radio equipment and telecommunications terminal equipment and the mutual recognition of their conformity”, in short referred to as R&TTE Directive 1999/5/EC 89/336/EC Directive on electromagnetic compatibility 73/23/EC Directive on electrical equipment designed for use within certain voltage limits (Low Voltage Directive) Standards of North American Type Approval CFR Title 47 “Code of Federal Regulations, Part 22 and Part 24 (Telecommuni-cations, PCS)”; US Equipment Authorization FCC UL 60 950 “Product Safety Certification” (Safety requirements) NAPRD.03 “Overview of PCS Type certification review board Mobile Equipment Type Certification and IMEI control” PCS Type Certification Review board (PTCRB), Version 3.1.0 RSS133 (Issue2) Canadian Standard Standards of European Type Approval 3GPP TS 51.010-1 “Digital cellular telecommunications system (Phase 2); Mobile Station (MS) conformance specification” ETSI EN 301 511 “V7.0.1 (2000-12) Candidate Harmonized European Standard (Telecommunications series) Global System for Mobile communications (GSM); Harmonized standard for mobile stations in the GSM 900 and DCS 1800 bands covering essential requirements under article 3.2 of the R&TTE directive (1999/5/EC) (GSM 13.11 version 7.0.1 Release 1998)” GCF-CC “Global Certification Forum - Certification Criteria” V3.16.0 ETSI EN 301 489-1 “V1.2.1 Candidate Harmonized European Standard (Telecommunications series) Electro Magnetic Compatibility and Radio spectrum Matters (ERM); Electro Magnetic Compatibility (EMC) standard for radio equipment and services; Part 1: Common Technical Requirements” ETSI EN 301 489-7 “V1.1.1 Candidate Harmonized European Standard (Telecommunications series) Electro Magnetic Compatibility and Radio spectrum Matters (ERM); Electro Magnetic Compatibility (EMC) standard for radio equipment and services; Part 7: Specific conditions for mobile and portable radio and ancillary equipment of digital cellular radio telecommunications systems (GSM and DCS)” EN 60 950 Safety of information technology equipment (2000)
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 13 of 96 20.04.2005 Requirements of quality IEC 60068 Environmental testing DIN EN 60529 IP codes Compliance with international rules and regulations Manufacturers of mobile or fixed devices incorporating TC65 modules are advised to have their completed product tested and approved for compliance with all applicable national and international regulations. As a quad-band GSM/GPRS engine designed for use on any GSM network in the world, TC65 is required to pass all approvals relevant to operation on the European and North American markets. For the North American market this includes the Rules and Regulations of the Federal Communications Commission (FCC) and PTCRB, for the European market the R&TTE Directives and GCF Certification Criteria must be fully satisfied. The FCC Equipment Authorization granted to the TC65 Siemens reference application is valid only for the equipment described in Section 8.1. SAR requirements specific to portable mobiles Mobile phones, PDAs or other portable transmitters and receivers incorporating a GSM module must be in accordance with the guidelines for human exposure to radio frequency energy. This requires the Specific Absorption Rate (SAR) of portable TC65 based applications to be evaluated and approved for compliance with national and/or international regulations. Since the SAR value varies significantly with the individual product design manufacturers are advised to submit their product for approval if designed for portable use. For European and US markets the relevant directives are mentioned below. It is the responsibility of the manufacturer of the final product to verify whether or not further standards, recommendations or directives are in force outside these areas. Products intended for sale on US markets ES 59005/ANSI C95.1 Considerations for evaluation of human exposure to Electromagnetic Fields (EMFs) from Mobile Telecommunication Equipment (MTE) in the frequency range 30MHz - 6GHz Products intended for sale on European markets EN 50360 Product standard to demonstrate the compliance of mobile phones with the basic restrictions related to human exposure to electromagnetic fields (300MHz - 3GHz) Note: Usage of TC65 in a fixed, mobile or portable application is not allowed without a new FCC certification.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 14 of 96 20.04.2005 1.4 Safety Precautions The following safety precautions must be observed during all phases of the operation, usage, service or repair of any cellular terminal or mobile incorporating TC65. Manufacturers of the cellular terminal are advised to convey the following safety information to users and operating personnel and to incorporate these guidelines into all manuals supplied with the product. Failure to comply with these precautions violates safety standards of design, manufacture and intended use of the product. Siemens AG assumes no liability for customer’s failure to comply with these precautions. When in a hospital or other health care facility, observe the restrictions on the use of mobiles. Switch the cellular terminal or mobile off, if instructed to do so by the guidelines posted in sensitive areas. Medical equipment may be sensitive to RF energy. The operation of cardiac pacemakers, other implanted medical equipment and hearing aids can be affected by interference from cellular terminals or mobiles placed close to the device. If in doubt about potential danger, contact the physician or the manufacturer of the device to verify that the equipment is properly shielded. Pacemaker patients are advised to keep their hand-held mobile away from the pacemaker, while it is on. Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it cannot be switched on inadvertently. The operation of wireless appliances in an aircraft is forbidden to prevent interference with communications systems. Failure to observe these instructions may lead to the suspension or denial of cellular services to the offender, legal action, or both. Do not operate the cellular terminal or mobile in the presence of flammable gases or fumes. Switch off the cellular terminal when you are near petrol stations, fuel depots, chemical plants or where blasting operations are in progress. Operation of any electrical equipment in potentially explosive atmospheres can constitute a safety hazard. Your cellular terminal or mobile receives and transmits radio frequency energy while switched on. Remember that interference can occur if it is used close to TV sets, radios, computers or inadequately shielded equipment. Follow any special regulations and always switch off the cellular terminal or mobile wherever forbidden, or when you suspect that it may cause interference or danger. Road safety comes first! Do not use a hand-held cellular terminal or mobile when driving a vehicle, unless it is securely mounted in a holder for speakerphone operation. Before making a call with a hand-held terminal or mobile, park the vehicle. Speakerphones must be installed by qualified personnel. Faulty installation or operation can constitute a safety hazard.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 15 of 96 20.04.2005 SOS IMPORTANT! Cellular terminals or mobiles operate using radio signals and cellular networks. Because of this, connection cannot be guaranteed at all times under all conditions. Therefore, you should never rely solely upon any wireless device for essential communications, for example emergency calls. Remember, in order to make or receive calls, the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength. Some networks do not allow for emergency calls if certain network services or phone features are in use (e.g. lock functions, fixed dialing etc.). You may need to deactivate those features before you can make an emergency call. Some networks require that a valid SIM card be properly inserted in the cellular terminal or mobile.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 16 of 96 20.04.2005 2 Product Concept 2.1 Key Features at a Glance Feature Implementation General Frequency bands Quad band: GSM 850/900/1800/1900MHz GSM class Small MS Output power (according to Release 99, V5) Class 4 (+33dBm ±2dB) for EGSM850 Class 4 (+33dBm ±2dB) for EGSM900 Class 1 (+30dBm ±2dB) for GSM1800 Class 1 (+30dBm ±2dB) for GSM1900 The values stated above are maximum limits. According to Release 99, Version 5, the maximum output power in a multislot configuration may be lower. The nominal reduction of maximum output power varies with the number of uplink timeslots used and amounts to 3.0dB for 2Tx, 4.8dB for 3Tx and 6.0dB for 4Tx. Power supply 3.2V to 4.5V Power consumption Sleep mode: max. TBD Power down mode: typically 50µA Java platform Java Virtual Machine with interfaces to AT Parser, Serial Interface, FlashFileSystem and TCP/IP Stack. Major benefits: seamless integration into Java applications, ease of programming, no need for application microcontroller, extremely cost-efficient hardware and software design – ideal platform for industrial GSM applications. Operating temperature -30°C to +65°C ambient temperature Auto switch-off at +90°C board temperature (preliminary) Physical Dimensions: 33.9mm x 44.6mm x max. 3.5mm Weight: approx. 7.5g GSM / GPRS features Data transfer GPRS • Multislot Class 12 • Full PBCCH support • Mobile Station Class B • Coding Scheme 1 – 4 CSD • V.110, RLP, non-transparent • 2.4, 4.8, 9.6, 14.4kbps • USSD PPP-stack for GPRS data transfer
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 17 of 96 20.04.2005 Feature Implementation SMS • Point-to-point MT and MO • Cell broadcast • Text and PDU mode • Storage: SIM card plus 25 SMS locations in mobile equipment• Transmission of SMS alternatively over CSD or GPRS. Preferred mode can be user defined. Fax Group 3; Class 1 Audio Speech codecs: • Half rate HR (ETS 06.20) • Full rate FR (ETS 06.10) • Enhanced full rate EFR (ETS 06.50/06.60/06.80) • Adaptive Multi Rate AMR Speakerphone operation, echo cancellation, noise suppression DTMF, 7 ringing tones Software AT commands AT-Hayes GSM 07.05 and 07.07, Siemens AT commands for RIL compatibility (NDIS/RIL) MicrosoftTM compatibility RIL / NDIS for Pocket PC and Smartphone SIM Application Toolkit SAT Release 99 TCP/IP stack Access by AT commands IP addresses IP version 6 Remote SIM Access TC65 supports Remote SIM Access. RSA enables TC65 to use a remote SIM card via its serial interface, in addition to the SIM card locally attached to the dedicated lines of the application interface. In a vehicle mounted scenario, for example, this allows the driver to access a mobile phone brought into the car from a car-embedded phone. The connection between both phones can be a Bluetooth wireless link or a serial link, e.g. via the car cradle. The necessary protocols and procedures are implemented according to the “SIM Access Profile Interoperability Specification of the Bluetooth Special Interest Group”. Firmware update Download over serial interface ASC0 Download over SIM interface Download over USB Interfaces 2 serial interfaces ASC0 • 8-wire modem interface with status and control lines, unbalanced, asynchronous • 1.2kbps to 460kbps • Autobauding TBD • Supports RTS0/CTS0 hardware handshake and software XON/XOFF flow control. • Multiplex ability according to GSM 07.10 Multiplexer Protocol.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 18 of 96 20.04.2005 Feature Implementation ASC1 • 4-wire, unbalanced asynchronous interface • 1.2kbps to 460kbps • Autobauding TBD • Supports RTS1/CTS1 hardware handshake and software XON/XOFF flow control USB Supports a USB 2.0 Full Speed (12Mbit/s) slave interface. I2C I2C bus for 7-bit addressing and transmission rates up to 400kbps.Programmable with AT^SSPI command. Alternatively, all pins of the I²C interface are configurable as SPI. SPI Serial Peripheral Interface for transmission rates up to 6.5 Mbps. Programmable with AT^SSPI command. If the SPI is active the I²C interface is not available. Audio • 2 analog interfaces • 1 digital interface (PCM) SIM interface Supported SIM cards: 3V, 1.8V Antenna 50Ohms. External antenna can be connected via antenna connector or solderable pad. Module interface 80-pin board-to-board connector Power on/off, Reset Power on/off • Switch-on by hardware pin IGT • Switch-off by AT command (AT^SMSO) • Automatic switch-off in case of critical temperature and voltage conditions. Reset • Orderly shutdown and reset by AT command • Emergency reset by hardware pin EMERG_RST Special features Charging Supports management of rechargeable Lithium Ion and Lithium Polymer batteries Real time clock Timer functions via AT commands GPIO 10 I/O pins of the application interface programmable as GPIO. Programming is done via AT commands. Phonebook SIM and phone Evaluation kit DSB75 DSB75 Evaluation Board designed to test and type approve Siemens cellular engines and provide a sample configuration for application engineering.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 19 of 96 20.04.2005 2.2 TC65 System Overview User ApplicationTC65Application InterfaceHeadphonesor HeadsetAudioCodecChargerChargingcircuitUARTSIM cardAntennaInterfaceI2CSPIUSBDACADCSlaveUSBHostASC0(Modem)ASC1SIM AnalogAudioDigitalAudio Charge PowerSupplyI2CSlaveSPI10 xGPIO Figure 1: TC65 system overview
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 20 of 96 20.04.2005 2.3 Circuit Concept Figure 2 shows a block diagram of the TC65 module and illustrates the major functional components: Baseband block: • Digital baseband processor with DSP • Analog processor with power supply unit (PSU) • Flash / SRAM (stacked) • Application interface (board-to-board connector) RF section: • RF transceiver • RF power amplifier • RF front end • Antenna connector Digital Baseband Processor with DSP Analog Controller wit h PSUBATT+GNDIGT EM ERG_ RS TASC(0)5SIM InterfaceCCINCCRSTCCIOCCCLKCCVCCD(0:15)A(0 :24)RD; WR; CS; WAITRF Control BusInterfaceRF - BasebandNTCBATT_TEMPVDDL PSYNCRF PartTransce iverRF PowerAmplifierSRAMFlash68TC65Application Interface (80 pins)I / Q4Au di o a na log10USB3I2C2VEX TISENSEVSE NSEVCHA RGECHARGEGATE3RESETResetBATTYPETE M P2REFCHGASC (1)426 MHzFront EndDAI7PWR _IN DMeasuringNetwork32 .76 8kH z26 MHzRTC Figure 2: TC65 block diagram
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 21 of 96 20.04.2005 3 Application Interface TC65 is equipped with an 80-pin board-to-board connector that connects to the external application. The host interface incorporates several sub-interfaces described in the following chapters: • Power supply - see Section 3.1 • Charger interface – see Section 3.5 • SIM interface - see Section 3.8 • Serial interface ASC0 - see Section 3.9 • Serial interface ASC1 - see Section 3.10 • Serial interface USB - see Section 3.11 • Serial interface I²C - see Section 3.12 • Two analog audio interfaces - see Section 3.13 • Digital audio interface (DAI) - see Section 3.13 and 3.13.4 • Status and control lines: IGT, EMERG_RST, PWR_IND, SYNC - see Table 17
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 22 of 96 20.04.2005 3.1 Operating Modes The table below briefly summarizes the various operating modes referred to in the following chapters. Table 1: Overview of operating modes GSM / GPRS SLEEP Various power save modes set with AT+CFUN command. Software is active to minimum extent. If the module was registered to the GSM network in IDLE mode, it is registered and paging with the BTS in SLEEP mode, too. Power saving can be chosen at different levels: The NON-CYCLIC SLEEP mode (AT+CFUN=0) disables the AT interface. The CYCLIC SLEEP modes AT+CFUN=7 and 9 alternatively activate and deactivate the AT interfaces to allow permanent access to all AT commands. GSM IDLE Software is active. Once registered to the GSM network, paging with BTS is carried out. The module is ready to send and receive. GSM TALK Connection between two subscribers is in progress. Power consumption depends on network coverage individual settings, such as DTX off/on, FR/EFR/HR, hopping sequences, antenna. GPRS IDLE EGPRS IDLE Module is ready for GPRS/EGPRS data transfer, but no data is currently sent or received. Power consumption depends on network settings and GPRS/EGPRS configuration (e.g. multislot settings). Normal operation GPRS DATA EGPRS DATA GPRS/EGPRS data transfer in progress. Power consumption depends on network settings (e.g. power control level), uplink / downlink data rates, GPRS/EGPRS configuration (e.g. used multislot settings) and reduction of maximum output power. POWER DOWN Normal shutdown after sending the AT^SMSO command. The Power Supply disconnects the supply voltage from the baseband part of the circuit. Only a voltage regulator is active for powering the RTC. Software is not active. Interfaces are not accessible. Operating voltage (connected to BATT+) remains applied.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 23 of 96 20.04.2005 Airplane mode Airplane mode shuts down the radio part of the module, causes the module to log off from the GSM/GPRS network and disables all AT commands whose execution requires a radio connection. Airplane mode can be controlled by using the AT commands AT^SCFG and AT+CALA: • With AT^SCFG=MEopMode/Airplane/OnStart the module can be configured to enter the Airplane mode each time when switched on or reset. • The parameter AT^SCFG=MEopMode/Airplane can be used to switch back and forth between Normal mode and Airplane mode any time during operation. • Setting an alarm time with AT+CALA followed by AT^SMSO wakes the module up into Airplane mode at the scheduled time. Charge-only mode Limited operation for battery powered applications. Enables charging while module is detached from GSM network. Limited number of AT commands is accessible. Charge-only mode applies when the charger is connected if the module was powered down with AT^SMSO. Charge mode during normal operation Normal operation (SLEEP, IDLE, TALK, GPRS IDLE, GPRS/EGPRS DATA) and charging running in parallel. Charge mode changes to Charge-only mode when the module is powered down before charging has been completed. See Table 6 for the various options proceeding from one mode to another.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 24 of 96 20.04.2005 3.2 Power Supply TC65 needs to be connected to a power supply at the B2B connector (5 pins each BATT+ and GND). The power supply of TC65 has to be a single voltage source at BATT+. It must be able to provide the peak current during the uplink transmission. All the key functions for supplying power to the device are handled by the power management section of the analog controller. This IC provides the following features: • Stabilizes the supply voltages for the GSM baseband using low drop linear voltage regulators. • Switches the module's power voltages for the power up and down procedures. • Delivers, across the VEXT pin, a regulated voltage for an external application. This voltage is not available in Power-down mode. • SIM switch to provide SIM power supply. 3.2.1 Minimizing Power Losses When designing the power supply for your application please pay specific attention to power losses. Ensure that the input voltage VBATT+ never drops below 3.2V on the TC65 board, not even in a transmit burst where current consumption can rise to typical peaks of 2A. It should be noted that TC65 switches off when exceeding these limits. Any voltage drops that may occur in a transmit burst should not exceed 400mV. The measurement network monitors outburst and inburst values. The drop is the difference of both values. The maximum drop (Dmax) since the last start of the module will be saved. In IDLE and SLEEP mode, the module switches off if the minimum battery voltage (Vbattmin) is reached. Example: VImin = 3.2V Dmax = 0.35V Vbattmin = VImin + Dmax Vbattmin = 3.2V + 0.35V = 3.55V The best approach to reducing voltage drops is to use a board-to-board connection as recommended, and a low impedance power source. The resistance of the power supply lines on the host board and of a battery pack should also be considered. Note: If the application design requires an adapter cable between both board-to-board connectors, use a flex cable as short as possible in order to minimize power losses.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 25 of 96 20.04.2005 Example: If the length of the flex cable reaches the maximum length of 100mm, this connection may cause, for example, a resistance of 30m in the BATT+ line and 30m in the GND line. As a result, a 2A transmit burst would add up to a total voltage drop of 120mV. Plus, if a battery pack is involved, further losses may occur due to the resistance across the battery lines and the internal resistance of the battery including its protection circuit. Figure 3: Power supply limits during transmit burst 3.2.2 Measuring the Supply Voltage VBATT+ The reference points for measuring the supply voltage VBATT+ on the module are BATT+ and GND, both accessible at a capacitor located close to the board-to-board connector of the module. Figure 4: Position of the reference points BATT+ and GND 3.2.3 Monitoring Power Supply by AT Command To monitor the supply voltage you can also use the AT^SBV command which returns the value related to the reference points BATT+ and GND. The module continuously measures the voltage at intervals depending on the operating mode of the RF interface. The duration of measuring ranges from 0.5s in TALK/DATA mode to 50s when TC65 is in IDLE mode or Limited Service (deregistered). The displayed voltage (in mV) is averaged over the last measuring period before the AT^SBV command was executed. Transmit burst 2ATransmit burst 2ARippleDropmin. 3.2VBATT+Reference point BATT+ Reference point GND
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 26 of 96 20.04.2005 3.3 Power Up / Power Down Scenarios In general, be sure not to turn on TC65 while it is beyond the safety limits of voltage and temperature stated in Chapter 5. TC65 would immediately switch off after having started and detected these inappropriate conditions. In extreme cases this can cause permanent damage to the module. 3.3.1 Turn on TC65 TC65 can be started in a variety of ways as described in the following sections: • Hardware driven start-up by IGT line: starts Normal mode or Airplane mode (see Section 3.3.1.1) • Software controlled reset by AT+CFUN command: starts Normal mode or Airplane mode (see Section 3.3.1.3) • Hardware driven start-up by VCHARGE line: starts charging algorithm and charge-only mode (see Section 3.3.1.2) • Wake-up from Power-down mode by using RTC interrupt: starts Airplane mode The option whether to start into Normal mode or Airplane mode depends on the settings made with the AT^SCFG command or AT+CALA. With AT+CALA, followed by AT^SMSO the module can be configured to restart into Airplane mode at a scheduled alarm time. Switching back and forth between Normal mode and Airplane mode is possible any time during operation by using the AT^SCFG command. After startup or mode change the following URCs indicate the module’s ready state: • “SYSSTART” indicates that the module has entered Normal mode. • “^SYSSTART AIRPLANE MODE” indicates that the module has entered Airplane mode. • “^SYSSTART CHARGE ONLY MODE” indicates that the module has entered the Charge-only mode. Detailed explanations on AT^SCFG, AT+CFUN, AT+CALA and Airplane mode can be found in [1]. 3.3.1.1 Turn on TC65 Using Ignition Line IGT When the TC65 module is in Power-down mode, it can be started to Normal mode or Airplane mode by driving the IGT (ignition) line to ground. This must be accomplished with an open drain/collector driver to avoid current flowing into this pin. The module will start up when both of the following two conditions are met: • The supply voltage applied at BATT+ must be in the operating range. • The IGT line needs to be driven low for at least 400ms. Considering different strategies of host application design the figures below show two approaches to meet this requirement: The example in Figure 5 assumes that IGT is activated after BATT+ has already been applied. The example in Figure 6 assumes that IGT is held low before BATT+ is switched on. In either case, to power on the module, ensure that low state of IGT takes at least 400ms from the moment the voltage at BATT+ is available.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 27 of 96 20.04.2005 If configured to a fix baud rate (AT+IPR0), the module will send the URC “^SYSSTART” or “^SYSSTART AIRPLANE MODE” to notify that it is ready to operate. If autobauding is enabled (AT+IPR=0) there will be no notification. EMERG_RSTVEXTTXD0/TXD1/RTS0/RST1/DTR0 (driven by the application)CTS0/CTS1/DSR0/DCD0ca. 500 msSerial interfacesASC0 and ASC1Undefined ActivePWR_INDt = 400msmin120msBATT+IGTHiZ Figure 5: Power-on with operating voltage at BATT+ applied before activating IGT
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 28 of 96 20.04.2005 EMERG_RSTPWR_INDt = 400msmin120msBATT+IGTHiZVEXTTXD0/TXD1/RTS0/RST1/DTR0 (driven by the application)CTS0/CTS1/DSR0/DCD0ca. 500 msSerial interfacesASC0 and ASC1Undefined Active Figure 6: Power-on with IGT held low before switching on operating voltage at BATT+ 3.3.1.2 Turn on TC65 Using the VCHARGE Signal As detailed in Section 3.5.7, the charging adapter can be connected regardless of the module’s operating mode. If the charger is connected to the charger input of the external charging circuit and the module’s VCHARGE pin while TC65 is off, and the battery voltage is above the undervoltage lockout threshold, processor controlled fast charging starts (see Section 3.5.6). TC65 enters a restricted mode, referred to as Charge-only mode where only the charging algorithm will be launched. During the Charge-only mode TC65 is neither logged on to the GSM network nor are the serial interfaces fully accessible. To switch to normal operation and log on to the GSM network, the IGT line needs to be activated as described in Section 3.3.1.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 29 of 96 20.04.2005 3.3.1.3 Reset TC65 via AT+CFUN Command To reset and restart the TC65 module use the command AT+CFUN. You can enter AT+CFUN=,1 or AT+CFUN=x,1, where x may be in the range from 0 to 9. See [1] for details. If configured to a fix baud rate (AT+IPR0), the module will send the URC “^SYSSTART” or “^SYSSTART AIRPLANE MODE” to notify that it is ready to operate. If autobauding is enabled (AT+IPR=0) there will be no notification. To register to the network SIM PIN authentication is necessary after restart. 3.3.1.4 Reset TC65 in Case of Emergency via EMERG_RST Caution: Use the EMERG_RST pin only when, due to serious problems, the software is not responding for more than 5 seconds. Pulling the EMERG_RST pin causes the loss of all information stored in the volatile memory since the processor restarts immediately. Therefore, this procedure is intended only for use in case of emergency, e.g. if TC65 does not respond, if reset or shutdown via AT command fails. The EMERG_RST signal is available on the application interface. To control the EMERG_RST line it is recommended to use an open drain / collector driver. To actually reset the TC65 module, the EMERG_RST line must be pulled to ground for ≥10ms. After releasing the line TC65 will start again. After hardware driven restart, notification via “^SYSSTART” or “^SYSSTART AIRPLANE” URC is the same as in case of restart by IGT or AT command. To register to the network SIM PIN authentication is necessary after restart.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 30 of 96 20.04.2005 3.3.2 Turn off TC65 TC65 can be turned off as follows: • Normal shutdown: Software controlled by AT^SMSO command • Automatic shutdown: Takes effect if board or battery temperature is out of range or if undervoltage or overvoltage conditions occur. 3.3.2.1 Turn off TC65 Using AT Command The best and safest approach to powering down TC65 is to issue the AT^SMSO command. This procedure lets TC65 log off from the network and allows the software to enter into a secure state and safe data before disconnecting the power supply. The mode is referred to as Power-down mode. In this mode, only the RTC stays active. Before switching off the device sends the following response: ^SMSO: MS OFF OK ^SHUTDOWN After sending AT^SMSO do not enter any other AT commands. There are two ways to verify when the module turns off: • Wait for the URC “^SHUTDOWN”. It indicates that data have been stored non-volatile and the module turns off in less than 1 second. • Also, you can monitor the PWR_IND pin. High state of PWR_IND definitely indicates that the module is switched off. Be sure not to disconnect the supply voltage VBATT+ before the URC “^SHUTDOWN” has been issued and the PWR_IND signal has gone high. Otherwise you run the risk of losing data. Signal states during turn-off are shown in Figure 7. While TC65 is in Power-down mode the application interface is switched off and must not be fed from any other source. Therefore, your application must be designed to avoid any current flow into any digital pins of the application interface, especially of the serial interfaces. No special care is required for the USB interface which is protected from reverse current.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 31 of 96 20.04.2005 VEXT See note 1TXD0/TXD1/RTS0/RTS1/DTR0 (driven by the application)Serial interfacesASC0 and ASC1UndefinedActivePWR_INDCTS0/CTS1/DSR0/DTR0 Figure 7: Signal states during turn-off procedure Note 1: Depending on capacitance load from host application 3.3.2.2 Leakage Current in Power Down Mode The leakage current in Power Down mode varies depending on the following conditions: • If the supply voltage at BATT+ was disconnected and then applied again without starting up the TC65 module, the leakage current ranges between 90µA and 100µA. • If the TC65 module is started and afterwards powered down with AT^SMSO, then the leakage current is only 50µA. Therefore, in order to minimize the leakage current take care to start up the module at least once before it is powered down.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 32 of 96 20.04.2005 3.3.3 Automatic Shutdown Automatic shutdown takes effect if: • the TC65 board is exceeding the critical limits of overtemperature or undertemperature • the battery is exceeding the critical limits of overtemperature or undertemperature • undervoltage or overvoltage is detected See Charge-only mode described in section 3.5.7 for exceptions. The automatic shutdown procedure is equivalent to the Power-down initiated with the AT^SMSO command, i.e. TC65 logs off from the network and the software enters a secure state avoiding loss of data. Alert messages transmitted before the device switches off are implemented as Unsolicited Result Codes (URCs). The presentation of these URCs can be enabled or disabled with the two AT commands AT^SBC and AT^SCTM. The URC presentation mode varies with the condition, please see Chapters 3.3.3.1 to 3.3.3.4 for details. For further instructions on AT commands refer to [1]. 3.3.3.1 Temperature Dependent Shutdown The board temperature is constantly monitored by an internal NTC resistor located on the PCB. The NTC that detects the battery temperature must be part of the battery pack circuit as described in 3.5.3 The values detected by either NTC resistor are measured directly on the board or the battery and therefore, are not fully identical with the ambient temperature. Each time the board or battery temperature goes out of range or back to normal, TC65 instantly displays an alert (if enabled). • URCs indicating the level "1" or "-1" allow the user to take appropriate precautions, such as protecting the module from exposure to extreme conditions. The presentation of the URCs depends on the settings selected with the AT^SCTM write command: AT^SCTM=1: Presentation of URCs is always enabled. AT^SCTM=0 (default): Presentation of URCs is enabled for 15 seconds time after start-up of TC65. After 15 seconds operation, the presentation will be disabled, i.e. no alert messages can be generated. • URCs indicating the level "2" or "-2" are instantly followed by an orderly shutdown. The presentation of these URCs is always enabled, i.e. they will be output even though the factory setting AT^SCTM=0 was never changed. The maximum temperature ratings are stated in Table 16. Refer to Table 2 for the associated URCs. All statements are based on test conditions according to IEC 60068-2-2 (still air).
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 33 of 96 20.04.2005 Table 2: Temperature dependent behavior Sending temperature alert (15s after TC65 start-up, otherwise only if URC presentation enabled) ^SCTM_A: 1 Caution: Tamb of battery close to overtemperature limit. ^SCTM_B: 1 Caution: Tamb of board close to overtemperature limit. ^SCTM_A: -1 Caution: Tamb of battery close to undertemperature limit. ^SCTM_B: -1 Caution: Tamb of board close to undertemperature limit. ^SCTM_A: 0 Battery back to uncritical temperature range. ^SCTM_B: 0 Board back to uncritical temperature range. Automatic shutdown (URC appears no matter whether or not presentation was enabled) ^SCTM_A: 2 Alert: Tamb of battery equal or beyond overtemperature limit. TC65 switches off.^SCTM_B: 2 Alert: Tamb of board equal or beyond overtemperature limit. TC65 switches off. ^SCTM_A: -2 Alert: Tamb of battery equal or below undertemperature limit. TC65 switches off. ^SCTM_B: -2 Alert: Tamb of board equal or below undertemperature limit. TC65 switches off. 3.3.3.2 Temperature Control during Emergency call If the temperature limit is exceeded while an emergency call is in progress the engine continues to measure the temperature, but deactivates the shutdown functionality. If the temperature is still out of range when the call ends, the module switches off immediately (without another alert message). 3.3.3.3 Undervoltage Shutdown if Battery NTC is Present In applications where the module’s charging technique is used and an NTC is connected to the BATT_TEMP terminal, the software constantly monitors the applied voltage. If the measured battery voltage is no more sufficient to set up a call the following URC will be presented: ^SBC: Undervoltage. The message will be reported, for example, when you attempt to make a call while the voltage is close to the shutdown threshold of 3.2V and further power loss is caused during the transmit burst. In IDLE mode, the shutdown threshold is the sum of the module’s minimum supply voltage (3.2V) and the value of the maximum voltage drop resulting from earlier calls. This means that in IDLE mode the actual shutdown threshold may be higher than 3.2V. Therefore, to properly calculate the actual shutdown threshold application manufacturers are advised to measure the maximum voltage drops that may occur during transmit bursts. To remind you that the battery needs to be charged soon, the URC appears several times before the module switches off. To enable or disable the URC use the AT^SBC command. The URC will be enabled when you enter the write command and specify the current consumption of your host application. Step by step instructions are provided in [1].
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 34 of 96 20.04.2005 3.3.3.4 Undervoltage Shutdown if no Battery NTC is Present The undervoltage protection is also effective in applications, where no NTC connects to the BATT_TEMP terminal. Thus, you can take advantage of this feature even though the application handles the charging process or TC65 is fed by a fixed supply voltage. All you need to do is executing the write command AT^SBC=<current> which automatically enables the presentation of URCs. You do not need to specify <current>. Whenever the supply voltage falls below the value of 3.2V the URC ^SBC: Undervoltage appears several times before the module switches off. 3.3.3.5 Overvoltage Shutdown In the event of the maximum voltage of 4.6V is reached the module sends a URC and then performs an orderly shutdown. Further details: TBD Keep in mind that several TC65 components are directly linked to BATT+ and, therefore, the supply voltage remains applied at major parts of TC65, even if the module is switched off. Especially the power amplifier is very sensitive to high voltage and might even be destroyed.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 35 of 96 20.04.2005 3.4 Automatic GPRS Multislot Class Change Temperature control is also effective for operation in GPRS Multislot Class 10 and GPRS Multislot Class 12. If the board temperature increases to the limit specified for restricted operation1) while data are transmitted over GPRS, the module automatically reverts: • from GPRS Multislot Class 12 (4Tx slots) to GPRS Multislot Class 8 (1Tx), • from GPRS Multislot Class 10 (2Tx slots) to GPRS Multislot Class 8 (1Tx) This reduces the power consumption and, consequently, causes the board’s temperature to decrease. Once the temperature drops to a value of 5 degrees below the limit of restricted operation, TC65 returns to the higher Multislot Class. If the temperature stays at the critical level or even continues to rise, TC65 will not switch back to the higher class. After a transition from GPRS Multislot Class 12 or 10 to GPRS Multislot Class 8 a possible switchback to GPRS Multislot Class 12 or 10 is blocked for one minute. Please note that there is not one single cause of switching over to a lower Multislot Class. Rather it is the result of an interaction of several factors, such as the board temperature that depends largely on the ambient temperature, the operating mode and the transmit power. Furthermore, take into account that there is a delay until the network proceeds to a lower or, accordingly, higher Multislot Class. The delay time is network dependent. In extreme cases, if it takes too much time for the network and the temperature cannot drop due to this delay, the module may even switch off as described in Section 3.3.3.1. 1) See Table 16 for temperature limits known as restricted operation.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 36 of 96 20.04.2005 3.5 Charging Control TC65 integrates a charging management for rechargeable Lithium Ion and Lithium Polymer batteries. You can skip this chapter if charging is not your concern, or if you are not using the implemented charging algorithm. The following sections contain an overview of charging and battery specifications. Please refer to [4] for greater detail, especially regarding requirements for batteries and chargers, appropriate charging circuits, recommended batteries and an analysis of operational issues typical of battery powered GSM/GPRS applications. 3.5.1 Hardware Requirements TC65 has no on-board charging circuit. To benefit from the implemented charging management you are required to install a charging circuit within your application according to the Figure 38. 3.5.2 Software Requirements Use the command AT^SBC, parameter <current>, to enter the current consumption of the host application. This information enables the TC65 module to correctly determine the end of charging and terminate charging automatically when the battery is fully charged. If the <current> value is inaccurate and the application draws a current higher than the final charge current, either charging will not be terminated or the battery fails to reach its maximum voltage. Therefore, the termination condition is defined as: final charge current (50mA) plus current consumption of the external application. If used the current flowing over the VEXT pin of the application interface (typically 2.9V) must be added, too. The parameter <current> is volatile, meaning that the factory default (0mA) is restored each time the module is powered down or reset. Therefore, for better control of charging, it is recommended to enter the value every time the module is started. See [1] for details on AT^SBC.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 37 of 96 20.04.2005 3.5.3 Battery Pack Requirements The charging algorithm has been optimized for rechargeable Lithium batteries that meet the characteristics listed below and in Table 3. It is recommended that the battery pack you want to integrate into your TC65 application is compliant with these specifications. This ensures reliable operation, proper charging and, particularly, allows you to monitor the battery capacity using the AT^SBC command. Failure to comply with these specifications might cause AT^SBC to deliver incorrect battery capacity values. • Li-Ion or Lithium Polymer battery pack specified for a maximum charging voltage of 4.2V and a recommended capacity of 1000 to 1200mAh. • Since charging and discharging largely depend on the battery temperature, the battery pack should include an NTC resistor. If the NTC is not inside the battery it must be in thermal contact with the battery. The NTC resistor must be connected between BATT_TEMP and GND. The B value of the NTC should be in the range: 10kΩ +5% @ 25°C, B25/85 = 3423K to B =3435K ± 3% (alternatively acceptable: 10kΩ +2% @ 25°C, B25/50 = 3370K +3%). Please note that the NTC is indispensable for proper charging, i.e. the charging process will not start if no NTC is present. • Ensure that the pack incorporates a protection circuit capable of detecting overvoltage (protection against overcharging), undervoltage (protection against deep discharging) and overcurrent. Due to the discharge current profile typical of GSM applications, the circuit must be insensitive to pulsed current. • On the TC65 module, a built-in measuring circuit constantly monitors the supply voltage. In the event of undervoltage, it causes TC65 to power down. Undervoltage thresholds are specific to the battery pack and must be evaluated for the intended model. When you evaluate undervoltage thresholds, consider both the current consumption of TC65 and of the application circuit. • The internal resistance of the battery and the protection should be as low as possible. It is recommended not to exceed 150m, even in extreme conditions at low temperature. The battery cell must be insensitive to rupture, fire and gassing under extreme conditions of temperature and charging (voltage, current). • The battery pack must be protected from reverse pole connection. For example, the casing should be designed to prevent the user from mounting the battery in reverse orientation. • It is recommended that the battery pack be approved to satisfy the requirements of CE conformity. Figure 8 shows the circuit diagram of a typical battery pack design that includes the protection elements described above. Figure 8: Battery pack circuit diagram to BATT_TEMP to GNDNTCPolyfuseϑProtection Circuit+-Battery cellto BATT+
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 38 of 96 20.04.2005 Table 3: Specifications of battery packs suitable for use with TC65 Battery type Rechargeable Lithium Ion or Lithium Polymer battery Nominal voltage 3.6V / 3.7V Capacity Recommended: 1000mAh to 1200mAh Minimum: 500mAh NTC 10k ± 5% @ 25°C approx. 5k @ 45°C approx. 26.2k @ 0°C B value range: B (25/85)=3423K to B =3435K ± 3% Overcharge detection voltage 4.325 ± 0.025V Overdischarge detection voltage 2.5 ± 0.05V Overcurrent detection 3 ± 0.5A Overcurrent detection delay time 4 ~ 16ms Short detection delay time 50µs Internal resistance <130m Note: A maximum internal resistance of 150m should not be exceeded even after 500 cycles and under extreme conditions. 3.5.4 Batteries Recommended for Use with TC65 When you choose a battery for your TC65 application you can take advantage of one of the following two batteries offered by VARTA Microbattery GmbH. Both batteries meet all requirements listed above. They have been thoroughly tested by Siemens, proved to be suited for TC65, and are CE approved. • LIP 633450A1B PCM.STB, type Lithium Ion This battery is listed in the standard product range of VARTA. It is incorporated in a shrink sleeve and has been chosen for integration into the reference setup submitted for Type Approval of Siemens GSM modules. • LPP 503759CA PCM.NTC.LT50, type Lithium Polymer This battery has been especially designed by VARTA for use with Siemens GSM modules. It has the same properties as the above Li-Ion battery, except that it is type Polymer, is smaller and comes without casing. Specifications, construction drawings and sales contacts for both VARTA batteries can be found in Section 9.3.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 39 of 96 20.04.2005 3.5.5 Charger Requirements For using the implemented charging algorithm and the reference charging circuit recommended in [4] and in Figure 38, the charger has to meet the following requirements: Output voltage: 5.2Volts ±0.2V (stabilized voltage) Output current: 500mA Chargers with a higher output current are acceptable, but please consider that only 500mA will be applied when a 0.3Ohms shunt resistor is connected between VSENSE and ISENSE. See [4] for further details. 3.5.6 Implemented Charging Technique If all requirements listed above are met (appropriate external charging circuit of application, battery pack, charger, AT^SBC settings) then charging is enabled in various stages depending on the battery condition: Trickle charging: • Trickle charge current flows over the VCHARGE line. • Trickle charging is done when a charger is present (connected to VCHARGE) and the battery is deeply discharged or has undervoltage. If deeply discharged (Deep Discharge Lockout at VBATT+= 0…2.5V) the battery is charged with 5mA, in case of undervoltage (Undervoltage Lockout at VBATT+= 2.5…3.2V) it is charged with 30mA Software controlled charging: • Controlled over the CHARGEGATE. • Temperature conditions: 0°C to 45°C • Software controlled charging is done when the charger is present (connected to VCHARGE) and the battery voltage is at least above the undervoltage threshold. Software controlled charging passes the following stages: - Power ramp: Depending on the discharge level of the battery (i.e. the measured battery voltage VBATT+) the software adjusts the maximum charge current for charging the battery. The duration of power ramp charging is very short (less than 30 seconds). - Fast charging: Battery is charged with constant current (approx. 500mA) until the battery voltage reaches 4.2V (approx. 80% of the battery capacity). - Top-up charging: The battery is charged with constant voltage of 4.2V at stepwise reducing charge current until full battery capacity is reached. • The duration of software controlled charging depends on the battery capacity and the level of discharge.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 40 of 96 20.04.2005 3.5.7 Operating Modes during Charging Of course, the battery can be charged regardless of the engine's operating mode. When the GSM module is in Normal mode (SLEEP, IDLE, TALK, GPRS IDLE or GPRS DATA mode), it remains operational while charging is in progress (provided that sufficient voltage is applied). The charging process during the Normal mode is referred to as Charge mode. If the charger is connected to the charger input of the external charging circuit and the module’s VCHARGE pin while TC65 is in Power-down mode, TC65 goes into Charge-only mode. While the charger remains connected it is not possible to switch the module off by using the AT^SMSO command or the automatic shutdown mechanism. Instead the following applies: • If the module is in Normal mode and the charger is connected (Charge mode) the AT^SMSO command causes the module to shut down shortly and then start into the Charge-only mode. • In Charge-only mode the AT^SMSO command is not usable. • In Charge-only mode the module neither switches off when the battery or the module exceeds the critical limits of overtemperature or undertemperature. In these cases you can only switch the module off by disconnecting the charger. To proceed from Charge-only mode to another operating mode you have the following options: • To switch from Charge-only mode to Normal mode drive the ignition line (IGT) to ground for 1 second. • To switch from Charge-only mode to Airplane mode enter the command AT^SCFG=MEopMode/Airplane,on. • If AT^SCFG=MEopMode/Airplane/OnStart,on is set, driving the ignition line (IGT) activates the Airplane mode.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 41 of 96 20.04.2005 Table 4: Comparison Charge-only and Charge mode How to activate mode Description of mode Charge mode Connect charger to charger input of host application charging circuit and module’s VCHARGE pin while TC65 is • operating, e.g. in IDLE or TALK mode • in SLEEP mode • Battery can be charged while GSM module remains operational and registered to the GSM network. • In IDLE and TALK mode, the serial interfaces are accessible. All AT commands can be used to full extent. NOTE: If the module operates at maximum power level (PCL5) and GPRS Class 12 at the same time the current consumption is higher than the current supplied by the charger. Charge-only mode Connect charger to charger input of host application charging circuit and module’s VCHARGE pin while TC65 is • in Power-down mode • in Normal mode: Connect charger to the VCHARGE pin, then enter AT^SMSO. NOTE: While trickle charging is in progress, be sure that the host application is switched off. If the application is fed from the trickle charge current the module might be prevented from proceeding to software controlled charging since the current would not be sufficient. • Battery can be charged while GSM engine is deregistered from GSM network. • Charging runs smoothly due to constant current consumption. • The AT interface is accessible and allows to use the commands listed below. Table 5: AT commands available in Charge-only mode AT command Use AT+CALA Set alarm time, configure Airplane mode. AT+CCLK Set date and time of RTC. AT^SBC Query status of charger connection. Enable / disable “^SBC” URCs. AT^SBV Monitor supply voltage. AT^SCTM Query temperature range, enable/disable URCs to report critical temperature ranges AT^SCFG Enable/disable parameters MEopMode/Airplane or MEopMode/Airplane/OnStart
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 42 of 96 20.04.2005 3.6 Summary of State Transitions (Except SLEEP Mode) Table 6: State transitions of TC65 (except SLEEP mode) The table shows how to proceed from one mode to another (grey column = present mode, white columns = intended modes) Further mode ÎÎÎ Present mode POWER DOWN Normal mode**) Charge-only mode*) Airplane mode POWER DOWN mode --- If AT^SCFG=MeOpMode/ Airplane/OnStart,off: IGT >400 ms at low level Connect charger to VCHARGE If AT^SCFG=MeOpMode/ Airplane/OnStart,on: IGT >400 ms at low level Regardless of AT^SCFG configuration: scheduled wake-up set with AT+CALA. Normal mode**) AT^SMSO --- AT^SMSO if charger is connected AT^SCFG=MeOpMode/ Airplane,on. If AT^SCFG=MeOpMode/ Airplane/OnStart,on: AT+CFUN=x,1 or EMERG_RST. Charge-only mode *) Disconnect charger If AT^SCFG=MeOpMode/ Airplane/OnStart,off: IGT >1s at low level --- AT^SCFG=MeOpMode/ Airplane,on. If AT^SCFG=MeOpMode/ Airplane/OnStart,on: IGT >1s at low level Airplane mode AT^SMSO AT^SCFG=MeOpMode/ Airplane,off AT^SMSO if charger is connected --- *) See section 3.5.7 for details on the charging mode **) Normal mode covers TALK, DATA, GPRS, EGPRS, IDLE and SLEEP modes
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 43 of 96 20.04.2005 3.7 RTC Backup The internal Real Time Clock of TC65 is supplied from a separate voltage regulator in the analog controller which is also active when TC65 is in POWER DOWN status. An alarm function is provided that allows to wake up TC65 to Airplane mode without logging on to the GSM network. In addition, you can use the VDDLP pin on the board-to-board connector to backup the RTC from an external capacitor or a battery (rechargeable or non-chargeable). The capacitor is charged by the BATT+ line of TC65. If the voltage supply at BATT+ is disconnected the RTC can be powered by the capacitor. The size of the capacitor determines the duration of buffering when no voltage is applied to TC65, i.e. the larger the capacitor the longer TC65 will save the date and time. A serial 1k resistor placed on the board next to VDDLP limits the charge current of an empty capacitor or battery. The following figures show various sample configurations. Please refer to Table 17 for the parameters required. Baseband processor RTC PSU+BATT+ 1kB2BVDDLP Figure 9: RTC supply from capacitor RTC +BATT+ 1kB2BVDDLPBaseband processor PSU Figure 10: RTC supply from rechargeable battery RTC ++BATT+ 1kVDDLPB2BBaseband processor PSU Figure 11: RTC supply from non-chargeable battery
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 44 of 96 20.04.2005 3.8 SIM Interface The baseband processor has an integrated SIM interface compatible with the ISO 7816 IC Card standard. This is wired to the host interface (board-to-board connector) in order to be connected to an external SIM card holder. Six pins on the board-to-board connector are reserved for the SIM interface. The SIM interface supports 3V and 1.8V SIM cards. Please refer to Table 17 for electrical specifications of the SIM interface lines depending on whether a 3V or 1.8V SIM card is used. The CCIN pin serves to detect whether a tray (with SIM card) is present in the card holder. Using the CCIN pin is mandatory for compliance with the GSM 11.11 recommendation if the mechanical design of the host application allows the user to remove the SIM card during operation. To take advantage of this feature, an appropriate SIM card detect switch is required on the card holder. For example, this is true for the model supplied by Molex, which has been tested to operate with TC65 and is part of the Siemens reference equipment submitted for type approval. See Chapter 8 for Molex ordering numbers. Table 7: Signals of the SIM interface (board-to-board connector) Signal Description CCGND Separate ground connection for SIM card to improve EMC. Be sure to use this ground line for the SIM interface rather than any other ground pin or plane on the module. A design example for grounding the SIM interface is shown in Figure 38. CCCLK Chipcard clock, various clock rates can be set in the baseband processor. CCVCC SIM supply voltage. CCIO Serial data line, input and output. CCRST Chipcard reset, provided by baseband processor. CCIN Input on the baseband processor for detecting a SIM card tray in the holder. If the SIM is removed during operation the SIM interface is shut down immediately to prevent destruction of the SIM. The CCIN pin is active low. The CCIN pin is mandatory for applications that allow the user to remove the SIM card during operation. The CCIN pin is solely intended for use with a SIM card. It must not be used for any other purposes. Failure to comply with this requirement may invalidate the type approval of TC65. The total cable length between the board-to-board connector pins on TC65 and the pins of the external SIM card holder must not exceed 100mm in order to meet the specifications of 3GPP TS 51.010-1 and to satisfy the requirements of EMC compliance. To avoid possible cross-talk from the CCCLK signal to the CCIO signal be careful that both lines are not placed closely next to each other. A useful approach is using the CCGND line to shield the CCIO line from the CCCLK line. Note: No guarantee can be given, nor any liability accepted, if loss of data is encountered after removing the SIM card during operation. Also, no guarantee can be given for properly initializing any SIM card that the user inserts after having removed a SIM card during operation. In this case, the application must restart TC65.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 45 of 96 20.04.2005 3.9 Serial Interface ASC0 TC65 offers an 8-wire unbalanced, asynchronous modem interface ASC0 conforming to ITU-T V.24 protocol DCE signalling. The electrical characteristics do not comply with ITU-T V.28. The significant levels are 0V (for low data bit or active state) and 2.9V (for high data bit or inactive state). For electrical characteristics please refer to Table 17. TC65 is designed for use as a DCE. Based on the conventions for DCE-DTE connections it communicates with the customer application (DTE) using the following signals: • Port TXD @ application sends data to the module’s TXD0 signal line • Port RXD @ application receives data from the module’s RXD0 signal line GSM module (DCE) Application (DTE)TXDRXDRTSCTSRINGDCDDSRDTRTXD0RXD0RTS0CTS0RING0DCD0DSR0DTR0 Figure 12: Serial interface ASC0 Features • Includes the data lines TXD0 and RXD0, the status lines RTS0 and CTS0 and, in addition, the modem control lines DTR0, DSR0, DCD0 and RING0. • ASC0 is primarily designed for controlling voice calls, transferring CSD, fax and GPRS data and for controlling the GSM engine with AT commands. • Full Multiplex capability allows the interface to be partitioned into three virtual channels, yet with CSD and fax services only available on the first logical channel. Please note that when the ASC0 interface runs in Multiplex mode, ASC1 cannot be used. For more details on Multiplex mode see [5]. • The DTR0 signal will only be polled once per second from the internal firmware of TC65. • The RING0 signal serves to indicate incoming calls and other types of URCs (Unsolicited Result Code). It can also be used to send pulses to the host application, for example to wake up the application from power saving state. See [1] for details on how to configure the RING0 line by AT^SCFG. • By default, configured for 8 data bits, no parity and 1 stop bit. The setting can be changed using the AT command AT+ICF and, if required, AT^STPB. For details see [1]. • ASC0 can be operated at bit rates from 300bps to 460800bps. • Autobauding supports the following bit rates: TBD. • Autobauding is not compatible with multiplex mode. • Supports RTS0/CTS0 hardware flow control and XON/XOFF software flow control.
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 46 of 96 20.04.2005 Table 8: DCE-DTE wiring of ASC0 DCE DTE V.24 circuit Pin function Signal direction Pin function Signal direction 103 TXD0 Input TXD Output 104 RXD0 Output RXD Input 105 RTS0 Input RTS Output 106 CTS0 Output CTS Input 108/2 DTR0 Input DTR Output 107 DSR0 Output DSR Input 109 DCD0 Output DCD Input 125 RING0 Output /RING Input
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 47 of 96 20.04.2005 3.10 Serial Interface ASC1 TC65 offers a 4-wire unbalanced, asynchronous modem interface ASC1 conforming to ITU-T V.24 protocol DCE signalling. The electrical characteristics do not comply with ITU-T V.28. The significant levels are 0V (for low data bit or active state) and 2.9V (for high data bit or inactive state). For electrical characteristics please refer to Table 17. TC65 is designed for use as a DCE. Based on the conventions for DCE-DTE connections it communicates with the customer application (DTE) using the following signals: • Port TXD @ application sends data to module’s TXD1 signal line • Port RXD @ application receives data from the module’s RXD1 signal line GSM module (DCE) Application (DTE)TXDRXDRTSCTSTXD1RXD1RTS1CTS1 Figure 13: Serial interface ASC1 Features • Includes only the data lines TXD1 and RXD1 plus RTS1 and CTS1 for hardware handshake. • On ASC1 no RING line is available. The indication of URCs on the second interface depends on the settings made with the AT^SCFG command. For details refer to [1]. • Configured for 8 data bits, no parity and 1 or 2 stop bits. • ASC1 can be operated at bit rates from 300bps to 460800bps. • Autobauding TBD. • Supports RTS1/CTS1 hardware flow control and XON/XOFF software flow control. Table 9: DCE-DTE wiring of ASC1 DCE DTE V.24 circuit Pin function Signal direction Pin function Signal direction 103 TXD1 Input TXD Output 104 RXD1 Output RXD Input 105 RTS1 Input RTS Output 106 CTS1 Output CTS Input
TC65 Hardware Interface Description Strictly confidential / Draft s TC65_HD_V00.450 Page 48 of 96 20.04.2005 3.11 USB Interface TC65 supports a USB 2.0 Full Speed (12Mbit/s) device interface. It is primarily intended for use as command and data interface and for downloading firmware. The USB I/O-pins are capable of driving the signal at min 3.0V. They are 5V I/O compliant. To properly connect the module’s USB interface to the host a USB 2.0 compatible connector is required. Furthermore, the USB modem driver delivered with TC65 must be installed as described below. The USB host is responsible for supplying, across the VUSB_IN line, power to the module’s USB interface, but not to other TC65 interfaces. This is because TC65 is designed as a self-powered device compliant with the “Universal Serial Bus Specification Revision 2.0”1. MCUUSBTransceiverlin.RegulatorPSUBaseband controllerGSM moduleHost22Ohms22Ohms1.5kOhmsUSB_DPUSB_DNVUSB_IN5V3VD+D-VBUSGND80 pole board-to-board connector Figure 14: USB circuit 1 The specification is ready for download on http://www.usb.org/developers/docs/

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