Product Info

Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design Confidential / Released
4
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3.21. Audio Interfaces....................................................................................................................................62
3.21.1. Reference Circuit Design for Microphone..............................................................................63
3.21.2. Reference Circuit Design for Receiver Interface.................................................................. 63
3.21.3. Reference Circuit Design for Headphone Interface............................................................. 64
3.21.4. Reference Circuit Design for Loudspeaker Interface...........................................................64
3.21.5. Audio Interface Design Considerations..................................................................................65
3.22. Emergency Download Interface.........................................................................................................65
4 Wi-Fi and BT...................................................................................................................................................... 66
4.1. Wi-Fi Overview......................................................................................................................................66
4.1.1. Wi-Fi Performance..................................................................................................................... 66
4.2. BT Overview.......................................................................................................................................... 68
4.2.1. BT Performance......................................................................................................................... 69
5 GNSS....................................................................................................................................................................70
5.1. GNSS Performance..............................................................................................................................70
5.2. GNSS RF Design Guidance............................................................................................................... 70
6 Antenna Interface.............................................................................................................................................72
6.1. Main/Rx-diversity Antenna Interfaces................................................................................................72
6.1.1. Operating Frequency.................................................................................................................72
6.1.2. Reference Design of Main and Rx-diversity Antenna Interfaces....................................... 74
6.1.3. Reference Design of RF Layout.............................................................................................. 74
6.2. Wi-Fi/BT Antenna Interface.................................................................................................................76
6.3. GNSS Antenna Interface.....................................................................................................................77
6.3.1. Recommended Circuit for Passive Antenna..........................................................................78
6.3.2. Recommended Circuit for Active Antenna............................................................................. 78
6.4. Antenna Installation..............................................................................................................................79
6.4.1. Antenna Requirement................................................................................................................79
6.4.2. Recommended RF Connector for Antenna Installation.......................................................80
7 Electrical, Reliability and Radio Characteristics.....................................................................................82
7.1. Absolute Maximum Ratings................................................................................................................ 82
7.2. Power Supply Ratings..........................................................................................................................82
7.3. Charging Performance Specifications...............................................................................................83
7.4. Operating Temperature........................................................................................................................84
7.5. Current Consumption...........................................................................................................................84
7.6. RF Output Power..................................................................................................................................99
7.7. RF Receiving Sensitivity....................................................................................................................101
7.8. Electrostatic Discharge......................................................................................................................105
8 Mechanical Dimensions...............................................................................................................................106
8.1. Mechanical Dimensions of the Module...........................................................................................106
8.2. Recommended Footprint...................................................................................................................108
8.3. Top and Bottom Views of the Module............................................................................................. 109
9 Storage, Manufacturing and Packaging.................................................................................................. 110