Semtech LR1121 - Page 5

LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
5 of 130
Semtech
Proprietary & Confidential
www.semtech.com
8.1 Modem Configuration ................................................................................................................... 62
8.1.1 SetPacketType ..................................................................................................................... 63
8.1.2 GetPacketType ..................................................................................................................... 63
8.2 LoRa® Modem ................................................................................................................................... 64
8.2.1 LoRa Modulation Principle............................................................................................... 64
8.2.2 LoRa Packet Format............................................................................................................ 65
8.2.3 Channel Activity Detection (CAD)................................................................................. 66
8.3 LoRa® Commands ............................................................................................................................ 67
8.3.1 SetModulationParams....................................................................................................... 67
8.3.2 SetPacketParams ................................................................................................................. 68
8.3.3 SetCad ..................................................................................................................................... 68
8.3.4 SetCadParams....................................................................................................................... 69
8.3.5 SetLoRaSynchTimeout ...................................................................................................... 69
8.3.6 SetLoRaPublicNetwork...................................................................................................... 70
8.3.7 GetPacketStatus................................................................................................................... 70
8.4 (G)FSK Modem .................................................................................................................................. 71
8.4.1 (G)FSK Modulation Principle ........................................................................................... 71
8.4.2 (G)FSK Packet Engine ......................................................................................................... 71
8.4.3 (G)FSK Packet Format......................................................................................................... 72
8.4.4 SX128x Compatibility......................................................................................................... 73
8.5 (G)FSK Commands .......................................................................................................................... 74
8.5.1 SetModulationParams....................................................................................................... 74
8.5.2 SetPacketParams ................................................................................................................. 75
8.5.3 SetGfskSyncWord................................................................................................................ 76
8.5.4 SetPacketAdrs....................................................................................................................... 76
8.5.5 SetGfskCrcParams ............................................................................................................... 77
8.5.6 SetGfskWhitParams ............................................................................................................ 77
8.5.7 GetPacketStatus................................................................................................................... 78
8.6 LR-FHSS Modulation ....................................................................................................................... 79
8.6.1 LR-FHSS Modulation Principle........................................................................................ 79
8.7 LR-FHSS Commands ....................................................................................................................... 80
8.7.1 SetModulationParams....................................................................................................... 80
8.7.2 LrFhssBuildFrame................................................................................................................ 80
8.7.3 LrFhssSetSyncWord............................................................................................................ 82
8.7.4 Circuit Configuration for Long Range FHSS Transmission................................... 82
8.8 Data Buffer ......................................................................................................................................... 83
8.9 RSSI Functionality ............................................................................................................................ 83
9. Power Amplifiers........................................................................................................................................... 84
9.1 PA Supply Scheme .......................................................................................................................... 85
9.1.1 Low Power PA....................................................................................................................... 86
9.1.2 High Power PA...................................................................................................................... 87
9.2 PA Output Power ............................................................................................................................. 88
9.2.1 Low Power PA....................................................................................................................... 88
9.2.2 High Power PA...................................................................................................................... 89
9.2.3 High Frequency PA ............................................................................................................. 90
9.3 PA Current Consumption ............................................................................................................. 91