User's Manual

H350 LGA Serials Module Hardware User Manual Page of
43
7
5.5 UART Interface............................................................................................................................................ 33
5.5.1 UART Interface Description........................................................................................................... 33
5.5.2 UART Design....................................................................................................................................35
5.5.3 Ring Indicator................................................................................................................................... 35
5.6 USIM..............................................................................................................................................................36
5.6.1 USIM Interface................................................................................................................................. 36
5.6.2 USIM.................................................................................................................................................. 36
5.6.3 USIM Design Notice........................................................................................................................38
5.6.4 USIM Hot Plug..................................................................................................................................39
5.7 Digital Audio................................................................................................................................................. 40
5.7.1 I2S...................................................................................................................................................... 40
5.7.2 I2C...................................................................................................................................................... 40
5.7.3 PCM Mode Interface....................................................................................................................... 41
5.8 ADC Interface...............................................................................................................................................41
5.9 GPS_BLANKING........................................................................................................................................ 41
5.10 BODY_SAR............................................................................................................................................... 42
5.11 Clock............................................................................................................................................................42
5.12 Others......................................................................................................................................................... 42
6 Electrical and Environmental Features...............................................................................................................43
6.1 Electrical Features...................................................................................................................................... 43
6.2 Environmental Features.............................................................................................................................43
7 RF Interface.............................................................................................................................................................44
7.1 Operation Frequency Band....................................................................................................................... 44
7.1.1 Main Antenna....................................................................................................................................44
7.2 RF PCB Design........................................................................................................................................... 44
7.2.1 Layout Guideline..............................................................................................................................44
7.2.2 Impedance........................................................................................................................................ 44
7.3 Antenna Design........................................................................................................................................... 45
7.3.1 Main Antenna Design Requirements........................................................................................... 45