Fibocom L-831-EA, User Manual

Page: 8 / 43

L831-EA Module Hardware User Manual Page 8 of 43
5.5.1 USIM Pins ......................................................................................................................................... 30
5.5.2 Description of USIM ........................................................................................................................ 30
5.5.2.1 “Normally Closed ” SIM Circuit Design ............................................................................ 30
5.5.2.2 “Normally Open” SIM Circuit Design ................................................................................. 31
5.5.3 USIM Design Points ........................................................................................................................ 31
5.5.4 USIM Hot Plug .................................................................................................................................. 32
5.5.4.1 Hardware Connection .......................................................................................................... 32
5.5.4.2 Software Configuration ........................................................................................................ 32
5.6 Digital Audio ................................................................................................................................................. 32
5.6.1 Description of I2S Interface ............................................................................................................ 33
5.6.2 Description of PCM Interface ......................................................................................................... 33
5.7 Android/Win8Dual System Switch Control Interface ............................................................................. 34
5.8 W_DISABLE# Interface ............................................................................................................................. 34
5.8.1 Description of WWAN_DISABLE# Interface ............................................................................... 34
5.8.2 Description of GPS_DISABLE# Interface ................................................................................... 35
5.9 TX_BLANKING Interface ........................................................................................................................... 35
5.10 The WAKEUP_HOST Interface .............................................................................................................. 35
5.11 BODY_SAR Interface ............................................................................................................................... 36
5.12 Description of I2C Interface .................................................................................................................... 36
5.13 Clock Interface .......................................................................................................................................... 36
5.14 Config Interface ......................................................................................................................................... 36
5.15 RF Interface ............................................................................................................................................... 37
5.15.1 Description of RF Connector ....................................................................................................... 37
5.15.2 Description of RF Connecting Seat ............................................................................................ 37
5.15.3 Main Performance of RF Connector .......................................................................................... 38
5.16 Other Interfaces ........................................................................................................................................ 39
6 Electrical and Environmental ................................................................................................................................ 40
6.1 Electrical ....................................................................................................................................................... 40
6.2 Environmental .............................................................................................................................................. 40
7 RF Interface ............................................................................................................................................................. 41
7.1 Operating Band ........................................................................................................................................... 41
7.1.1 Antenna Band ................................................................................................................................... 41
7.2 RF PCB Design ........................................................................................................................................... 41
7.2.1 Routing Principle .............................................................................................................................. 41