SX1231-31SKB433 Semtech, SX1231-31SKB433 Datasheet - Page 5

• Manufacturer Part Number: SX1231-31SKB433
• Description: USB Kit - SX1231 433Mhz
• Manufacturer: Semtech

SX1231
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Index of Figures
Page
Figure 1. Block Diagram ................................................................................................................................................ 8
Figure 2. Pin Diagram .................................................................................................................................................... 9
Figure 3. Marking Diagram ............................................................................................................................................ 9
Figure 4. TCXO Connection ........................................................................................................................................ 16
Figure 5. Transmitter Block Diagram ........................................................................................................................... 19
Figure 6. Receiver Block Diagram ............................................................................................................................... 23
Figure 7. AGC Thresholds Settings ............................................................................................................................. 24
Figure 8. Cordic Extraction .......................................................................................................................................... 28
Figure 9. OOK Peak Demodulator Description ............................................................................................................ 29
Figure 10. Floor Threshold Optimization ..................................................................................................................... 30
Figure 11. Bit Synchronizer Description ...................................................................................................................... 31
Figure 12. FEI Process ................................................................................................................................................ 32
Figure 13. Optimized AFC (AfcLowBetaOn=1) ............................................................................................................ 33
Figure 14. Temperature Sensor Response ................................................................................................................. 34
Figure 15. Tx Startup, FSK and OOK .......................................................................................................................... 36
Figure 16. Rx Startup - No AGC, no AFC .................................................................................................................... 37
Figure 17. Rx Startup - AGC, no AFC ......................................................................................................................... 37
Figure 18. Rx Startup - AGC and AFC ........................................................................................................................ 37
Figure 19. Listen Mode Sequence (no wanted signal is received) .............................................................................. 39
Figure 20. Listen Mode Sequence (wanted signal is received) ................................................................................... 41
Figure 21. Auto Modes of Packet Handler ................................................................................................................... 42
Figure 22. SX1231 Data Processing Conceptual View ............................................................................................... 43
Figure 23. SPI Timing Diagram (single access) .......................................................................................................... 44
Figure 24. FIFO and Shift Register (SR) ..................................................................................................................... 45
Figure 25. FifoLevel IRQ Source Behavior .................................................................................................................. 46
Figure 26. Sync Word Recognition .............................................................................................................................. 47
Figure 27. Continuous Mode Conceptual View ........................................................................................................... 49
Figure 28. Tx Processing in Continuous Mode ............................................................................................................ 49
Figure 29. Rx Processing in Continuous Mode ........................................................................................................... 50
Figure 30. Packet Mode Conceptual View ................................................................................................................... 51
Figure 31. Fixed Length Packet Format ...................................................................................................................... 52
Figure 32. Variable Length Packet Format .................................................................................................................. 52
Figure 33. Unlimited Length Packet Format ................................................................................................................ 53
Figure 34. CRC Implementation .................................................................................................................................. 58
Figure 35. Manchester Encoding/Decoding ................................................................................................................. 58
Figure 36. Data Whitening ........................................................................................................................................... 59
Figure 37. POR Timing Diagram ................................................................................................................................. 75
Figure 38. Manual Reset Timing Diagram ................................................................................................................... 76
Figure 39. +13dBm Schematic .................................................................................................................................... 76
Figure 40. +17dBm Schematic .................................................................................................................................... 77
Figure 41. Package Outline Drawing ........................................................................................................................... 78
Rev 4 - Nov 2010
Page 5
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