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SX1231
WIRELESS & SENSING PRODUCTS
DATASHEET
FIGURES
Figure 1. Block Diagram .............................................................................................................................................. 10
Figure 2. Pin Diagram (not to scale) ............................................................................................................................ 11
Figure 3. Marking Diagram .......................................................................................................................................... 11
Figure 4. TCXO Connection ........................................................................................................................................ 18
Figure 5. Transmitter Block Diagram ........................................................................................................................... 21
Figure 6. Output Power Curves ................................................................................................................................... 24
Figure 7. Receiver Block Diagram ............................................................................................................................... 25
Figure 8. AGC Thresholds Settings ............................................................................................................................. 26
Figure 9. RSSI Dynamic Curve .................................................................................................................................... 30
Figure 10. Cordic Extraction ........................................................................................................................................ 30
Figure 11. OOK Peak Demodulator Description .......................................................................................................... 31
Figure 12. Floor Threshold Optimization ..................................................................................................................... 32
Figure 13. Bit Synchronizer Description ...................................................................................................................... 33
Figure 14. FEI Process ................................................................................................................................................ 34
Figure 15. Optimized AFC (AfcLowBetaOn=1) ............................................................................................................ 35
Figure 16. Temperature Sensor Response ................................................................................................................. 36
Figure 17. Tx Startup, FSK and OOK .......................................................................................................................... 38
Figure 18. Rx Startup - No AGC, no AFC .................................................................................................................... 39
Figure 19. Rx Startup - AGC, no AFC ......................................................................................................................... 39
Figure 20. Rx Startup - AGC and AFC ........................................................................................................................ 39
Figure 21. Listen Mode Sequence (no wanted signal is received) .............................................................................. 41
Figure 22. Listen Mode Sequence (wanted signal is received) ................................................................................... 43
Figure 23. Auto Modes of Packet Handler ................................................................................................................... 44
Figure 24. SX1231 Data Processing Conceptual View ............................................................................................... 45
Figure 25. SPI Timing Diagram (single access) .......................................................................................................... 46
Figure 26. FIFO and Shift Register (SR) ..................................................................................................................... 47
Figure 27. FifoLevel IRQ Source Behavior .................................................................................................................. 48
Figure 28. Sync Word Recognition .............................................................................................................................. 49
Figure 29. Continuous Mode Conceptual View ........................................................................................................... 51
Figure 30. Tx Processing in Continuous Mode ............................................................................................................ 51
Figure 31. Rx Processing in Continuous Mode ........................................................................................................... 52
Figure 32. Packet Mode Conceptual View ................................................................................................................... 53
Figure 33. Fixed Length Packet Format ...................................................................................................................... 54
Figure 34. Variable Length Packet Format .................................................................................................................. 54
Figure 35. Unlimited Length Packet Format ................................................................................................................ 55
Figure 36. CRC Implementation .................................................................................................................................. 60
Figure 37. Manchester Encoding/Decoding ................................................................................................................. 60
Figure 38. Data Whitening ........................................................................................................................................... 61
Figure 39. POR Timing Diagram ................................................................................................................................. 77
Figure 40. Manual Reset Timing Diagram ................................................................................................................... 78
Figure 41. +13dBm Schematic .................................................................................................................................... 78
Rev. 7 - June 2013
Page 6
www.semtech.com
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