SARA-G450 - System integration manual
UBX-18046432 - R09 Contents Page 4 of 131
C1-Public
1.13.9 Smart temperature management ................................................................................................48
1.13.10 AssistNow clients and GNSS integration ..............................................................................51
1.13.11 Hybrid positioning and CellLocate® ........................................................................................51
1.13.12 Firmware upgrade Over AT (FOAT) .........................................................................................54
1.13.13 Last gasp ......................................................................................................................................54
1.13.14 Power saving ................................................................................................................................55
2 Design-in ................................................................................................................................................ 56
2.1 Overview ......................................................................................................................................................56
2.2 Supply interfaces ......................................................................................................................................56
2.2.1 Module supply (VCC) ........................................................................................................................56
2.2.2 RTC supply (V_BCKP) .......................................................................................................................70
2.2.3 Interface supply (V_INT) ..................................................................................................................71
2.3 System functions interfaces ..................................................................................................................72
2.3.1 Module power-on (PWR_ON) ..........................................................................................................72
2.3.2 Module hard power-off (PWR_OFF) ..............................................................................................73
2.3.3 Digital I/O interfaces voltage selection (VSEL)...........................................................................74
2.4 Antenna interface .....................................................................................................................................75
2.4.1 Antenna RF interface (ANT) ...........................................................................................................75
2.4.2 Antenna detection interface (ANT_DET).....................................................................................82
2.5 SIM interface ..............................................................................................................................................85
2.5.1 Guidelines for SIM circuit design ...................................................................................................85
2.5.2 Guidelines for SIM layout design ...................................................................................................90
2.6 Serial interfaces ........................................................................................................................................91
2.6.1 Primary main serial interface (UART) ...........................................................................................91
2.6.2 Secondary auxiliary serial interface (AUX UART) .......................................................................98
2.6.3 Additional serial interface for FW upgrade and Tracing (FT UART) ......................................99
2.6.4 DDC (I2C) interface ........................................................................................................................ 100
2.7 Audio interfaces ..................................................................................................................................... 107
2.7.1 Analog audio interface .................................................................................................................. 107
2.8 General Purpose Input/Output (GPIO) ............................................................................................... 112
2.8.1 Guidelines for GPIO circuit design .............................................................................................. 112
2.8.2 Guidelines for GPIO layout design .............................................................................................. 113
2.9 Reserved pins (RSVD) ........................................................................................................................... 113
2.10 Module placement ................................................................................................................................. 113
2.11 Module footprint and paste mask ...................................................................................................... 114
2.12 Schematic for SARA-G450 modules integration ............................................................................ 115
2.13 Design-in checklist ................................................................................................................................. 117
2.13.1 Schematic checklist ...................................................................................................................... 117
2.13.2 Layout checklist ............................................................................................................................. 118
2.13.3 Antenna checklist .......................................................................................................................... 118
3 Handling and soldering ................................................................................................................... 119
3.1 Packaging, shipping, storage and moisture preconditioning ....................................................... 119