Fibocom H330SS, Hardware User Manual

Page: 4 / 39

H330SS LGA Module Hardware User Manual Page 4 of 38
5.4.2 USB Interface Application ...................................................................................................................................... 26
5.5 UART Interface ..................................................................................................................................................................... 27
5.5.1 UART Interface Description ................................................................................................................................... 27
5.5.2 UART Design ............................................................................................................................................................... 28
5.5.3 Ring Indicator ............................................................................................................................................................. 29
5.6 USIM ......................................................................................................................................................................................... 29
5.6.1 USIM Interface ............................................................................................................................................................ 29
5.6.2 USIM Design ................................................................................................................................................................ 30
5.6.3 USIM Design Notice ................................................................................................................................................. 30
5.6.4 USIM Hot Plug ............................................................................................................................................................ 31
5.7 Analog Audio ....................................................................................................................................................................... 31
5.7.1 Audio Interface Signal Description .................................................................................................................... 31
5.7.2 Audio Description ..................................................................................................................................................... 32
5.8 Digital Audio ......................................................................................................................................................................... 33
5.8.1 I2S ................................................................................................................................................................................... 33
5.8.2 I2C ................................................................................................................................................................................... 33
5.9 Others ...................................................................................................................................................................................... 34
6 Electrical and Environmental Features ...................................................................................................................................... 35
6.1 Electrical Features ............................................................................................................................................................... 35
6.2 Environmental Features ................................................................................................................................................... 35
7 RF Interface .......................................................................................................................................................................................... 36
7.1 Operation Frequency Band ............................................................................................................................................. 36
7.1.1 Main Antenna ............................................................................................................................................................. 36
7.1.2 Diversity Antenna ..................................................................................................................................................... 36
7.2 RF PCB Design ...................................................................................................................................................................... 37
7.2.1 Layout Guideline ....................................................................................................................................................... 37
7.2.2 Impedance ................................................................................................................................................................... 37
7.3 Antenna Design ................................................................................................................................................................... 37
7.3.1 Main Antenna Design Requirements ................................................................................................................ 37
7.3.2 Diversity Antenna Design ...................................................................................................................................... 38