Integration Manual

SARA-R4 series - System integration manual
UBX-16029218 - R20 Contents Page 5 of 129
C1-Public
2.4.1 General guidelines for antenna interfaces ..................................................................................62
2.4.2 Cellular antenna RF interface (ANT) .............................................................................................66
2.4.3 GNSS antenna RF interface (ANT_GNSS) ...................................................................................69
2.4.4 Cellular and GNSS RF coexistence ................................................................................................73
2.4.5 Antenna detection interface (ANT_DET).....................................................................................76
2.5 SIM interface ..............................................................................................................................................79
2.5.1 Guidelines for SIM circuit design ...................................................................................................79
2.5.2 Guidelines for SIM layout design ...................................................................................................83
2.6 Data communication interfaces ............................................................................................................84
2.6.1 UART interface ..................................................................................................................................84
2.6.2 USB interface .....................................................................................................................................89
2.6.3 SPI interface ......................................................................................................................................92
2.6.4 SDIO interface ...................................................................................................................................92
2.6.5 DDC (I2C) interface ...........................................................................................................................92
2.7 Audio ............................................................................................................................................................95
2.7.1 Guidelines for Audio circuit design ................................................................................................95
2.8 General Purpose Input/Output ...............................................................................................................95
2.8.1 Guidelines for GPIO circuit design .................................................................................................95
2.8.2 Guidelines for general purpose input/output layout design ....................................................96
2.9 GNSS peripheral input output ................................................................................................................96
2.9.1 Guidelines for GNSS peripheral input output circuit design ....................................................96
2.9.2 Guidelines for GNSS peripheral input output layout design ....................................................96
2.10 Reserved pins (RSVD) ..............................................................................................................................97
2.11 Module placement ....................................................................................................................................97
2.12 Module footprint and paste mask .........................................................................................................98
2.13 Thermal guidelines ...................................................................................................................................99
2.14 Schematic for SARA-R4 series module integration ....................................................................... 100
2.14.1 Schematic for SARA-R4 series modules .................................................................................. 100
2.15 Design-in checklist ................................................................................................................................. 101
2.15.1 Schematic checklist ...................................................................................................................... 101
2.15.2 Layout checklist ............................................................................................................................. 101
2.15.3 Antenna checklist .......................................................................................................................... 102
3 Handling and soldering ................................................................................................................... 103
3.1 Packaging, shipping, storage and moisture preconditioning ....................................................... 103
3.2 Handling ................................................................................................................................................... 103
3.3 Soldering .................................................................................................................................................. 104
3.3.1 Soldering paste .............................................................................................................................. 104
3.3.2 Reflow soldering ............................................................................................................................. 104
3.3.3 Optical inspection .......................................................................................................................... 105
3.3.4 Cleaning ........................................................................................................................................... 105
3.3.5 Repeated reflow soldering ........................................................................................................... 106
3.3.6 Wave soldering ............................................................................................................................... 106
3.3.7 Hand soldering ............................................................................................................................... 106