Altec GSM SOCKET AL7020S - Manual (Page 3)

AL7020S, AL7024S Designer’s Guide
Doc. No. DG_7024E Altec Electronic AG Seite 3 / 32
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