GSM Socket Modem

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  • 1. AL7020S, AL7024S Designers Guide GSM Socket Modem AL7020S, AL7020S-3V Series AL7024S, AL7024S-3V Series Designers Guide RELEASED 9. JANUARY 2006 Doc. No. DG_7024E Altec Electronic AG Seite 1 / 32
  • 2. AL7020S, AL7024S Designers Guide Information provided by Altec Electronic AG is believed to be accurate and reliable. However, no responsibility is assumed by Altec Electronic for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Altec other than for circuitry embodied in Altec products. Altec Electronic reserves the right to change circuitry at any time without notice. This document is subject to change without notice. Please read carefully the safety precautions for a terminal based on the AL7020S and AL7024S Socket Modems. Product names or services listed in this publication are for identification purposes only, and may be trademarks or registered trademarks of their respective companies. All other marks mentioned herein are the property of their respective owners. 2006 Altec Electronic AG Printed in Switzerland All Rights Reserved Doc. No. DG_7024E Altec Electronic AG Seite 2 / 32
  • 3. AL7020S, AL7024S Designers Guide Table of Contents 1. INTRODUCTION ..........................................................................................................5 1.1 Models Description .......................................................................................................5 1.2 Summary ......................................................................................................................5 1.3 Product Specifications ..................................................................................................6 2. TECHNICAL OVERVIEW.............................................................................................7 2.1 Block Diagramm of GSM Module .................................................................................7 2.2 Supported Interfaces ....................................................................................................7 3. HARDWARE INTERFACE ...........................................................................................8 3.1 Interface Signals...........................................................................................................8 3.2 Signal Description.........................................................................................................8 3.4 Antenna Interface (RF) ...............................................................................................15 3.4.1 RF Connector: ....................................................................................................15 3.4.2 Antenna Performance Recommendations..........................................................16 3.4.3 Antenna Installation ............................................................................................16 3.4.4 User Operation ...................................................................................................16 3.5 Internal SIM Card Interface ........................................................................................17 3.5.1 SIM Card reader pins supported:........................................................................17 3.6 SIM Card Mechanical Drawings .................................................................................18 3.7 External SIM Card Interface (-ES Option) ..................................................................19 3.7.1 External SIM Card reader pins supported: .........................................................19 3.7.2 SIM socket pin description:.................................................................................19 3.7.3 SIM Card Reader Integration:.............................................................................20 3.7.4 Layout Restrictions: ............................................................................................20 3.8 Audio - Interface .........................................................................................................21 3.8.1 Speaker-Circuit ...................................................................................................21 3.8.2 Microphone circuit...............................................................................................22 3.8.3 Audio Circuit Design Considerations ..................................................................22 3.9 Reset Signal (ON/OFF Signal) ...................................................................................23 3.9.1 Software Reset ...................................................................................................23 4. CONNECTORS AND PERIPHERAL REFERENCE...................................................24 4.1 RF CONNECTOR...................................................................................................24 4.2 Microphone.............................................................................................................24 4.3 Speaker ..................................................................................................................24 4.4 Antenna Cable........................................................................................................24 4.5 GSM antenna .........................................................................................................24 5. DESIGN GUIDELINES ...............................................................................................25 5.1 Electromagnetic Interference (EMI) Considerations ...................................................25 5.1.1 Grounding ...........................................................................................................26 5.1.2 Power Supply 5V (5V Models)............................................................................26 5.1.3 Power Supply 3.3V (3V Models).........................................................................27 5.1.4 Preferred Regulators ..........................................................................................27 5.1.5 RF Antenna.........................................................................................................28 5.2 Manufacturing Considerations....................................................................................28 6. MODULE DIMENSIONS ............................................................................................29 7. REGULATORY APPROVALS ....................................................................................30 7.1 Considerations for Regulatory Approvals ...................................................................30 7.1.1 Regulatory Requirements ...................................................................................30 7.1.2 Regulatory Statement .........................................................................................30 7.2 Safety Precautions .....................................................................................................31 7.2.1 User Operation ...................................................................................................31 7.2.2 Antenna Installation ............................................................................................31 7.2.3 Antenna care and replacement...........................................................................31 7.2.4 Electronic devices...............................................................................................31 8. APPENDIX A ..............................................................................................................32 8.1 REFERENCE DOCUMENTS .................................................................................32 Doc. No. DG_7024E Altec Electronic AG Seite 3 / 32
  • 4. AL7020S, AL7024S Designers Guide List of Tables & Figures Table 3-1. Serial TTL Signals...................................................................................................9 Table 3-2. Signal Descriptions ...............................................................................................10 Table 3-3. Signal Descriptions (Cont'd)..................................................................................11 Table 3-3. Signal Descriptions (Cont'd)..................................................................................12 Table 3-4. Analog Electrical Characteristics...........................................................................12 Table 3-5. Digital Electrical Characteristics............................................................................13 Table 3-6. Absolute Maximum Ratings ..................................................................................14 Table 3.7 Antenna Performance Recommendations ............................................................16 Table 3.8. Headset Speaker Output at Maximum Volume Level ...........................................21 FIGURE 2-1. INTE