Fibocom L-831-EA User Manual page 8

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
L831-EA Module Hardware User Manual Page 8 of 43