Quectel SC20 Series Hardware Design page 8

3.21. Sensor Interfaces..................................................................................................................... 63
3.22. Audio Interfaces ....................................................................................................................... 64
3.22.1. Reference Circuit Design for Microphone Interface ....................................................... 65
3.22.2. Reference Circuit Design for Earpiece Interface ........................................................... 66
3.22.3. Reference Circuit Design for Headphone Interface ....................................................... 66
3.22.4. Reference Circuit Design for Loudspeaker Interface..................................................... 67
3.22.5. Audio Interfaces Design Considerations........................................................................ 67
3.23. Emergency Download Interface .............................................................................................. 68
4 Wi-Fi and Bluetooth ........................................................................................................................... 69
4.1. Wi-Fi Overview ........................................................................................................................ 69
4.1.1. Wi-Fi Performance ......................................................................................................... 69
4.2. Bluetooth Overview ................................................................................................................. 71
4.2.1. Bluetooth Performance .................................................................................................. 72
5 GNSS ................................................................................................................................................... 73
5.1. GNSS Performance ................................................................................................................. 73
5.2. GNSS RF Design Guidelines .................................................................................................. 74
6 Antenna Interfaces ............................................................................................................................. 75
6.1. Main/Rx-diversity Antenna Interfaces ...................................................................................... 75
6.1.1. Operating Frequency ..................................................................................................... 75
6.1.2. Main and Rx-diversity Antenna Interfaces Reference Design ....................................... 80
6.2. Wi-Fi/Bluetooth Antenna Interface ........................................................................................... 80
6.3. GNSS Antenna Interface ......................................................................................................... 81
6.3.1. Recommended Circuit for Passive Antenna .................................................................. 82
6.3.2. Recommended Circuit for Active Antenna ..................................................................... 82
6.4. Reference Design for RF Layout ............................................................................................. 83
6.5. Antenna Installation ................................................................................................................. 85
6.5.1. Antenna Requirements .................................................................................................. 85
6.5.2. Recommended RF Connector for Antenna Installation ................................................. 86
7 Reliability, Radio and Electrical Characteristics ............................................................................ 89
7.1. Absolute Maximum Ratings ..................................................................................................... 89
7.2. Power Supply Ratings ............................................................................................................. 89
7.3. Charging Performance Specifications ..................................................................................... 90
7.4. Operating and Storage Temperatures ..................................................................................... 91
7.5. Power Consumption ................................................................................................................ 91
7.6. Tx Power ................................................................................................................................ 114
7.7. Rx Sensitivity ......................................................................................................................... 115
7.8. ESD ........................................................................................................................................ 122
8 Mechanical Information ................................................................................................................... 123
8.1. Mechanical Dimensions ......................................................................................................... 123
8.2. Recommended Footprint ....................................................................................................... 125
8.3. Top and Bottom Views ........................................................................................................... 126
SC20_Series_Hardware_Design
Smart Module Series
7 / 133