Contents
Copyright © Fibocom Wireless Inc. 2
3.8 GPIO...............................................................................................................................45
3.9 I2C...................................................................................................................................47
3.10 ADC ..............................................................................................................................48
3.11 Battery Supply Interface .........................................................................................48
3.11.1 Charging Description........................................................................................49
3.12 Motor Driver Interface ............................................................................................49
3.13 LCD...............................................................................................................................49
3.14 TP..................................................................................................................................52
3.15 Camera........................................................................................................................53
3.15.1 Camera 0..............................................................................................................55
3.15.2 Camera 1..............................................................................................................56
3.15.3 Camera 2..............................................................................................................57
3.15.4 Design Considerations .....................................................................................58
3.16 Audio............................................................................................................................59
3.16.1 Definition of Audio Interface...........................................................................59
3.16.2 MIC Circuit Design .............................................................................................61
3.16.3 Receiver Circuit Design.....................................................................................62
3.16.4 Headphone Interface Circuit Design ............................................................62
3.17 Force Download Interface......................................................................................62
4 Antenna Interface ........................................................................................64
4.1 MAIN/DRX Antenna ....................................................................................................64
4.1.1 Operating Bands ..................................................................................................64
4.1.2 Circuit Reference Design ....................................................................................67
4.2 WIFI/BT Antenna .........................................................................................................67
4.2.1 Operating Bands ..................................................................................................68
4.2.2 Circuit Reference Design ....................................................................................68
4.3 GNSS Antenna .............................................................................................................68
4.3.1 GNSS operating frequency ................................................................................69
4.3.2 Circuit Reference Design ....................................................................................69
4.4 Antenna Requirements .............................................................................................70
5 RF PCB Layout Design Guide ......................................................................72
