u-blox SARA-R4 Series System Integration Manual

Contents

SARA-R4 series - System Integration ManualUBX-16029218 - R06 ContentsPage 5 of 1022 Design-in ..................................................................................................................... 342.1 Overview ............................................................................................................................................ 342.2 Supply interfaces ................................................................................................................................ 352.2.1 Module supply (VCC) .................................................................................................................. 352.2.2 Generic digital interfaces supply output (V_INT) ........................................................................... 462.3 System functions interfaces ................................................................................................................ 472.3.1 Module power-on (PWR_ON) ...................................................................................................... 472.3.2 Module reset (RESET_N) .............................................................................................................. 482.4 Antenna interface ............................................................................................................................... 492.4.1 Antenna RF interface (ANT) ......................................................................................................... 492.4.2 Antenna detection interface (ANT_DET) ...................................................................................... 562.5 SIM interface ...................................................................................................................................... 592.5.1 Guidelines for SIM circuit design.................................................................................................. 592.5.2 Guidelines for SIM layout design ................................................................................................. 632.6 Data communication interfaces .......................................................................................................... 642.6.1 UART interface ............................................................................................................................ 642.6.2 USB interface............................................................................................................................... 692.6.3 SPI interface ................................................................................................................................ 712.6.4 SDIO interface ............................................................................................................................. 712.6.5 DDC (I2C) interface ...................................................................................................................... 712.7 Audio ................................................................................................................................................. 712.8 General Purpose Input/Output ............................................................................................................ 722.9 Reserved pins (RSVD) .......................................................................................................................... 722.10 Module placement .......................................................................................................................... 732.11 Module footprint and paste mask ................................................................................................... 742.12 Thermal guidelines .......................................................................................................................... 752.13 Schematic for SARA-R4 series module integration ........................................................................... 762.13.1 Schematic for SARA-R4 series modules ........................................................................................ 762.14 Design-in checklist .......................................................................................................................... 772.14.1 Schematic checklist ..................................................................................................................... 772.14.2 Layout checklist ........................................................................................................................... 782.14.3 Antenna checklist ........................................................................................................................ 783 Handling and soldering ............................................................................................. 793.1 Packaging, shipping, storage and moisture preconditioning ............................................................... 793.2 Handling ............................................................................................................................................. 793.3 Soldering ............................................................................................................................................ 803.3.1 Soldering paste............................................................................................................................ 803.3.2 Reflow soldering ......................................................................................................................... 803.3.3 Optical inspection ........................................................................................................................ 813.3.4 Cleaning...................................................................................................................................... 813.3.5 Repeated reflow soldering ........................................................................................................... 823.3.6 Wave soldering............................................................................................................................ 823.3.7 Hand soldering ............................................................................................................................ 82