Product Info
LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design
5
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3.12. SD Card Interface....................................................................................................................................48
3.13. ADC Interfaces.........................................................................................................................................51
3.14. Network Status Indication...................................................................................................................... 51
3.15. STATUS.....................................................................................................................................................53
3.16. Behaviors of RI.........................................................................................................................................53
3.17. SGMII Interface........................................................................................................................................54
4 GNSS Receiver.....................................................................................................................................................58
4.1. General Description...................................................................................................................................58
4.2. GNSS Performance...................................................................................................................................58
4.3. Layout Guidelines...................................................................................................................................... 59
5 Antenna Interfaces..............................................................................................................................................60
5.1. Main/Rx-diversity Antenna Interfaces.....................................................................................................60
5.1.1. Pin Definition................................................................................................................................... 60
5.1.2. Operating Frequency..................................................................................................................... 60
5.1.3. Reference Design of RF Antenna Interface...............................................................................61
5.1.4. Reference Design of RF Layout...................................................................................................62
5.2. GNSS Antenna Interface.......................................................................................................................... 64
5.3. Antenna Installation...................................................................................................................................65
5.3.1. Antenna Requirement....................................................................................................................65
5.3.2. Recommended RF Connector for Antenna Installation........................................................... 66
6 Electrical, Reliability and Radio Characteristics........................................................................................ 68
6.1. Absolute Maximum Ratings..................................................................................................................... 68
6.2. Power Supply Ratings...............................................................................................................................69
6.3. Operation and Storage Temperatures....................................................................................................69
6.4. Current Consumption................................................................................................................................ 70
6.5. RF Output Power....................................................................................................................................... 76
6.6. RF Receiving Sensitivity...........................................................................................................................77
6.7. Electrostatic Discharge............................................................................................................................. 81
6.8. Thermal Consideration..............................................................................................................................81
7 Mechanical Dimensions.....................................................................................................................................84
7.1. Mechanical Dimensions of the Module.................................................................................................. 84
7.2. Recommended Footprint.......................................................................................................................... 86
7.3. Design Effect Drawings of the Module................................................................................................... 87
8 Storage, Manufacturing and Packaging........................................................................................................88
8.1. Storage........................................................................................................................................................ 88
8.2. Manufacturing and Soldering...................................................................................................................89
8.3. Packaging....................................................................................................................................................90
9 Appendix A References.....................................................................................................................................91
10 Appendix B GPRS Coding Schemes...........................................................................................................95
11 Appendix C GPRS Multi-slot Classes......................................................................................................... 96