User's Manual

SARA-R4 series - System Integration Manual
UBX-16029218 - R03 Contents
Page 5 of 94
2.2.1 Module supply (VCC) .................................................................................................................. 31
2.2.2 Generic digital interfaces supply output (V_INT) ........................................................................... 41
2.3 System functions interfaces ................................................................................................................ 42
2.3.1 Module power-on (PWR_ON) ...................................................................................................... 42
2.3.2 Module reset (RESET_N) .............................................................................................................. 43
2.4 Antenna interface ............................................................................................................................... 44
2.4.1 Antenna RF interface (ANT) ......................................................................................................... 44
2.4.2 Antenna detection interface (ANT_DET) ...................................................................................... 51
2.5 SIM interface ...................................................................................................................................... 53
2.5.1 Guidelines for SIM circuit design.................................................................................................. 53
2.5.2 Guidelines for SIM layout design ................................................................................................. 57
2.6 Data communication interfaces .......................................................................................................... 58
2.6.1 UART interface ............................................................................................................................ 58
2.6.2 USB interface............................................................................................................................... 63
2.6.3 DDC (I
2
C) interface ...................................................................................................................... 65
2.7 General Purpose Input/Output ............................................................................................................ 65
2.8 Reserved pins (RSVD) .......................................................................................................................... 66
2.9 Module placement.............................................................................................................................. 66
2.10 Module footprint and paste mask ................................................................................................... 67
2.11 Thermal guidelines .......................................................................................................................... 68
2.12 Schematic for SARA-R4 series module integration ........................................................................... 69
2.12.1 Schematic for SARA-R4 series modules ........................................................................................ 69
2.13 Design-in checklist .......................................................................................................................... 70
2.13.1 Schematic checklist ..................................................................................................................... 70
2.13.2 Layout checklist ........................................................................................................................... 71
2.13.3 Antenna checklist ........................................................................................................................ 71
3 Handling and soldering ............................................................................................. 72
3.1 Packaging, shipping, storage and moisture preconditioning ............................................................... 72
3.2 Handling ............................................................................................................................................. 72
3.3 Soldering ............................................................................................................................................ 73
3.3.1 Soldering paste............................................................................................................................ 73
3.3.2 Reflow soldering ......................................................................................................................... 73
3.3.3 Optical inspection ........................................................................................................................ 74
3.3.4 Cleaning ...................................................................................................................................... 74
3.3.5 Repeated reflow soldering ........................................................................................................... 75
3.3.6 Wave soldering............................................................................................................................ 75
3.3.7 Hand soldering ............................................................................................................................ 75
3.3.8 Rework ........................................................................................................................................ 75
3.3.9 Conformal coating ...................................................................................................................... 75
3.3.10 Casting ........................................................................................................................................ 75
3.3.11 Grounding metal covers .............................................................................................................. 75
3.3.12 Use of ultrasonic processes .......................................................................................................... 75
4 Approvals .................................................................................................................... 76