SX1276 Ver la hoja de datos (PDF) - Semtech Corporation

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componentes Descripción

Fabricante

SX1276

137 MHz to 1020 MHz Low Power Long Range Transceiver

Semtech Corporation 

SX1276/77/78/79

WIRELESS, SENSING & TIMING

Table of contents

Section

DATASHEET

Page

Figure 1. Block Diagram .................................................................................................................................................9

Figure 2. Pin Diagrams .................................................................................................................................................10

Figure 3. Marking Diagram ...........................................................................................................................................12

Figure 4. SX1276/77/78/79 Block Schematic Diagram ................................................................................................23

Figure 5. LoRaTM Modem Connectivity .......................................................................................................................26

Figure 6. LoRaTM Packet Structure .............................................................................................................................29

Figure 7. Interrupts Generated in the Case of Successful Frequency Hopping Communication. ................................33

Figure 8. LoRaTM Data Buffer .....................................................................................................................................34

Figure 9. LoRaTM Modulation Transmission Sequence. .............................................................................................38

Figure 10. LoRaTM Receive Sequence. ......................................................................................................................39

Figure 11. LoRaTM CAD Flow .....................................................................................................................................43

Figure 12. CAD Time as a Function of Spreading Factor .............................................................................................44

Figure 13. Consumption Profile of the LoRa CAD Process ..........................................................................................45

Figure 14. OOK Peak Demodulator Description ...........................................................................................................49

Figure 15. Floor Threshold Optimization ......................................................................................................................50

Figure 16. Bit Synchronizer Description .......................................................................................................................51

Figure 17. Startup Process ...........................................................................................................................................56

Figure 18. Time to RSSI Sample ..................................................................................................................................57

Figure 19. Tx to Rx Turnaround ...................................................................................................................................58

Figure 20. Rx to Tx Turnaround ...................................................................................................................................58

Figure 21. Receiver Hopping ........................................................................................................................................59

Figure 22. Transmitter Hopping ....................................................................................................................................59

Figure 23. Timer1 and Timer2 Mechanism ...................................................................................................................63

Figure 24. Sequencer State Machine ...........................................................................................................................64

Figure 25. SX1276/77/78/79 Data Processing Conceptual View .................................................................................65

Figure 26. FIFO and Shift Register (SR) ......................................................................................................................66

Figure 27. FifoLevel IRQ Source Behavior ...................................................................................................................67

Figure 28. Sync Word Recognition ...............................................................................................................................68

Figure 29. Continuous Mode Conceptual View ............................................................................................................70

Figure 30. Tx Processing in Continuous Mode .............................................................................................................70

Figure 31. Rx Processing in Continuous Mode ............................................................................................................71

Figure 32. Packet Mode Conceptual View ...................................................................................................................72

Figure 33. Fixed Length Packet Format .......................................................................................................................73

Figure 34. Variable Length Packet Format ...................................................................................................................74

Figure 35. Unlimited Length Packet Format .................................................................................................................74

Figure 36. Manchester Encoding/Decoding .................................................................................................................78

Figure 37. Data Whitening Polynomial .........................................................................................................................79

Figure 38. SPI Timing Diagram (single access) ...........................................................................................................80

Figure 39. TCXO Connection .......................................................................................................................................81

Rev. 4 - March 2015

©2015 Semtech Corporation

Page 7

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