LR1110
User Manual
Rev.1.0
UM.LR1110.W.APP
March 2020
7 of 130
Semtech
Figure 1-1: LR1110 Block Diagram ............................................................................................................. 12
Figure 2-1: LR1110 Modes and Transitions............................................................................................. 14
Figure 3-1: Write Command Timing Diagram........................................................................................ 23
Figure 3-2: Read Command Timing Diagram ........................................................................................ 23
Figure 3-3: BUSY Timing Diagram.............................................................................................................. 25
Figure 5-1: LR1110 POR and BRN Functions........................................................................................... 37
Figure 6-1: TCXO............................................................................................................................................... 39
Figure 7-1: Sub-GHz Radio ............................................................................................................................ 41
Figure 7-2: LR1110 Current Profile During RX Duty Cycle Operation............................................ 45
Figure 7-3: RX Duty Cycle Upon Preamble Detection......................................................................... 46
Figure 8-1: LoRa® /(G)FSK Command Order ........................................................................................... 50
Figure 8-2: LoRa® Signal Bandwidth.......................................................................................................... 52
Figure 8-3: LoRa® Packet Format ................................................................................................................ 53
Figure 8-4: Fixed-Length Packet................................................................................................................. 60
Figure 8-5: Variable-Length Packet............................................................................................................ 61
Figure 8-6: (G)FSK Whitening....................................................................................................................... 62
Figure 9-1: LR1110 Power Amplifiers ........................................................................................................ 71
Figure 9-2: PA Block Diagram ...................................................................................................................... 72
Figure 9-3: Low Power PA VR_PA Voltage vs. TxPower...................................................................... 73
Figure 9-4: High Power PA VR_PA Voltage vs. TxPower..................................................................... 74
Figure 9-5: Low Power PA Output Power vs. TxPower ....................................................................... 75
Figure 9-6: HP PA Output Power vs. TxPower........................................................................................ 76
Figure 9-7: IDDTX vs TxPower, Low Power PA, DC-DC Configuration .......................................... 77
Figure 9-8: IDDTX vs TxPower, Low Power PA, LDO Configuration............................................... 78
Figure 9-9: IDDTX vs TxPower, High Power PA, DC-DC Configuration......................................... 79
Figure 9-10: IDDTX vs TxPower, High Power PA, LDO Configuration ........................................... 79
Figure 9-11: RF Switch, Double PA Operation ....................................................................................... 81
Figure 9-12: RF Switch, Single PA Operation (High Power PA Example)...................................... 81
Figure 9-13: Single Tie implementation: Only one PA Used (High Power PA Example)......... 81
Figure 9-14: Single Tie implementation: Both PAs Used (High Power PA Example) ............... 81
Figure 10-1: Wi-Fi Passive Scanning Sequence ..................................................................................... 84
Figure 11-1: GNSS System Overview......................................................................................................... 95
Figure 11-2: NAV Message Format............................................................................................................. 99
