Datasheet SX1280, SX1281 (Semtech) - 2

link to page 158
Ordering Information Part Number Delivery Order Quantity
SX1280IMLTRT Tape & Reel 3’000 pieces SX1281IMLTRT Tape & Reel 3’000 pieces QFN 24 Package, with the temperature operating range from -40 to 85°C Pb-free, Halogen free, RoHS/WEEE compliant product
Revision History Version ECO Date Changes and/or Modifications
Rev 1.0 035543 February 2017 First Release Added table of effective data rates for the LoRa® Modem Correction of the formulas for time-on-air in LoRa® Correction of typos in the chapter Host Controller Interface Rev 1.1 037029 May 2017 Update of the application schematic with optional TCXO Update of the reference design BOM Deletion of redundant information in the chapter Thermal Impedance The maximum SPI clock speed is reduced to 18 MHz Addition of a note in chapter 6.2.3 "Bandwidth" on SF and BW to be known in advance Addition of chapter 6.2.6 "Frequency Error" Addition of calculations of time-on-air in chapter 7.5 "LoRa Ranging Engine Packet" Addition of examples of SPI communication in chapter 11 "Host Controller Interface" Rev 2.0 040575 February 2018 Update of explanation on SetAutoTx in chapter 13.2.4 "BLE Specific Functions" Update of ranging results description in chapter 13.5 "Ranging Operation" Addition of an explanation of the Reference Design in chapter 14.1 "Reference Design" Addition of the tape and reel specifications in chapter 15 "Packaging Information" Addition of LoRa® and Bluetooth® trademark information Maximum RF input power (ML) is now 0 dBm Phase noise at 2.45 GHz with 1 MHz offset (PHN) is now -115 dBc/Hz Correction of minor typographical errors in tables 6-5, 6-7, 13-20 and in chapter 7.2 Rev 2.1 041639 April 2018 Addition of formulas for ranging duration in chapter 7.5.4 Addition of description of RSSI packet for LoRa® when SNR ≤ 0 in table 11-64 Correction of package thickness to 0.9 mm in chapter 15.1 Addition of package marking in chapter 15.2
SX1280/SX1281
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2 of 158 Data Sheet Rev 3.2 Semtech DS.SX1280-1.W.APP March 2020
Document Outline Table of Contents List of Figures List of Tables 1. Introduction 1.1 Analog Front End 1.2 Power Distribution 1.3 Modem 1.4 Packet Processing 1.5 Digital Interface and Control 2. Pin Connections 2.1 Transceiver Pinout 2.2 Package view 3. Specifications 3.1 ESD Notice 3.2 Absolute Minimum and Maximum Ratings 3.3 Operating Range 3.4 General Electrical Specifications 3.5 Receiver Electrical Specifications 3.5.1 Receiver Specifications 3.5.2 LoRa® Modem 3.5.3 FLRC Modem 3.5.4 FSK Modem 3.6 Transmitter Electrical Specifications 3.7 Crystal Oscillator Specifications 3.8 Digital Pin Levels 4. Analog Front End 4.1 Transmitter 4.2 Receiver 4.2.1 Low Power Mode and High Sensitivity Mode 4.2.2 Image Frequency 4.2.3 Wi-Fi and Bluetooth Immunity 4.3 PLL 4.4 RC Oscillators 5. Power Distribution 5.1 Selecting DC-DC Converter or LDO Regulation 5.2 Flexible DIO Supply 6. Digital Baseband 6.1 Overview 6.2 LoRa® Modem 6.2.1 LoRa® Modulation 6.2.2 Spreading Factor 6.2.3 Bandwidth 6.2.4 Forward Error Correction Coding Rate 6.2.5 Ranging Engine 6.2.6 Advanced Ranging 6.2.7 Frequency Error 6.3 FLRC Modem 6.3.1 Modem Bandwidth and Data Rates 6.3.2 FEC Coding Rate 6.3.3 Gaussian Filtering 6.4 FSK Modem 6.4.1 Modem Bandwidth and Data Rates 6.4.2 Modem Modulation Index 6.5 Guidance on Modem Selection 7. Packet Engine 7.1 GFSK Packet 7.1.1 Fixed-length Packet Format 7.1.2 Variable-length Packet Format 7.2 BLE Packet Format 7.3 FLRC Packet 7.3.1 FLRC Packet Format 7.3.2 Fixed-Length Packet Format 7.3.3 Variable-length Packet Format 7.3.4 FLRC Time-on-Air 7.4 LoRa® Packet 7.4.1 LoRa® Packet Format 7.4.2 Explicit (Variable-length) Header Mode 7.4.3 Implicit (Fixed-length) Header Mode 7.4.4 LoRa® Time-on-Air 7.5 LoRa® Ranging Engine Packet 7.5.1 Ranging Packet Format 7.5.2 Ranging Master Exchange 7.5.3 Ranging Slave Exchange 7.5.4 Total Exchange Duration 7.5.5 Measurement 8. Data Buffer 8.1 Principle of Operation 8.2 Receive Operation 8.3 Transmit Operation 8.4 Using the Data buffer 9. Digital Interface and Control 9.1 BUSY Pin Communication 9.2 Interface Detection 9.3 SPI Interface 9.3.1 SPI Timing 9.3.2 SPI Timing When the Transceiver is in Active Mode 9.3.3 SPI Timing When the Transceiver Leaves Sleep Mode 9.4 UART Interface 9.4.1 Default UART Settings 9.4.2 Setting the UART Speed 9.5 Pin Sharing 9.6 Multi-Purpose Digital Input/Output (DIO) 9.7 Transceiver Initialization on a Shared SPI Bus 10. Operational Modes 10.1 Startup 10.2 Sleep Mode 10.3 Standby Mode 10.4 Frequency Synthesis (FS) Mode 10.5 Receive (Rx) Mode 10.6 Transmit (Tx) Mode 10.7 Transceiver Circuit Modes Graphical Illustration 10.8 Active Mode Switching Time 11. Host Controller Interface 11.1 Command Structure 11.2 SetUartSpeed Command 11.3 GetStatus Command 11.4 Register Access Operations 11.4.1 WriteRegister Command 11.4.2 ReadRegister Command 11.5 Data Buffer Operations 11.5.1 WriteBuffer Command 11.5.2 ReadBuffer 11.6 Radio Operation Modes 11.6.1 SetSleep 11.6.2 SetStandby 11.6.3 SetFs 11.6.4 SetTx 11.6.5 SetRx 11.6.6 SetRxDutyCycle 11.6.7 SetLongPreamble 11.6.8 SetCAD 11.6.9 SetTxContinuousWave 11.6.10 SetTxContinuousPreamble 11.6.11 SetAutoTx 11.6.12 SetAutoFs 11.7 Radio Configuration 11.7.1 SetPacketType 11.7.2 GetPacketType 11.7.3 SetRfFrequency 11.7.4 SetTxParams 11.7.5 SetCadParams 11.7.6 SetBufferBaseAddress 11.7.7 SetModulationParams 11.7.8 SetPacketParams 11.8 Communication Status Information 11.8.1 GetRxBufferStatus 11.8.2 GetPacketStatus 11.8.3 GetRssiInst 11.9 IRQ Handling 11.9.1 SetDioIrqParams 11.9.2 GetIrqStatus 11.9.3 ClearIrqStatus 12. List of Commands 13. Register Map 14. Transceiver Operation 14.1 GFSK Operation 14.1.1 Common Transceiver Settings 14.1.2 Tx Setting and Operations 14.1.3 Rx Setting and Operations 14.2 BLE Operation 14.2.1 Common Transceiver Settings 14.2.2 Tx Setting and Operations 14.2.3 Rx Setting and Operations 14.2.4 BLE Specific Functions 14.3 FLRC Operation 14.3.1 Common Transceiver Settings 14.3.2 Tx Setting and Operations 14.3.3 Rx Setting and Operations 14.4 LoRa® Operation 14.4.1 Common Transceiver Settings for LoRa® 14.4.2 Tx Setting and Operations 14.4.3 Rx Setting and Operations 14.5 Ranging Operation 14.5.1 Ranging Device Setting 14.5.2 Ranging Operation as State Machines 14.5.3 Ranging RSSI 14.6 Advanced Ranging 14.6.1 Advanced Ranging Mode Operation 14.6.2 Advanced Ranging State Machine 14.7 Miscellaneous Functions 14.7.1 SetRegulatorMode Command 14.7.2 Context Saving 15. Reference Design and Application Schematics 15.1 Reference Design 15.1.1 Application Design Schematic 15.1.2 Reference Design BOM 15.1.3 Reference Design PCB 15.2 Application Design with optional TCXO 15.3 Application Design with Low Drop Out Regulator 15.4 Sleep Mode Consumption 16. Errata 16.1 All Modems: Continuous Receive Mode in Congested Traffic 16.1.1 Problem Description 16.1.2 Problem Solution 16.2 LoRa Modem: Additional Header Checks Required 16.2.1 Problem Description 16.2.2 Problem Solution 16.3 All Modems: Interrupt with Bad CRC 16.3.1 Problem Description 16.3.2 Problem Solution 16.4 FLRC Modem: Increased PER in FLRC Packets with Synch Word 16.4.1 Problem Description 16.4.2 Problem Solution 17. Packaging Information 17.1 Package Outline Drawing 17.2 Package Marking 17.3 Land Pattern 17.4 Reflow Profiles 17.5 Thermal Impedance 17.6 Tape and Reel Specification Glossary