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SX1231H
ADVANCED COMMUNICATIONS & SENSING DATASHEET
Rev 1 - Oct 2011
3.4.8. Complex Filter - OOK ............................................................................................................................... 27
3.4.9. RSSI ......................................................................................................................................................... 27
3.4.10. Cordic ..................................................................................................................................................... 28
3.4.11. FSK Demodulator ....................................................................................................................................29
3.4.12. OOK Demodulator.................................................................................................................................. 29
3.4.13. Bit Synchronizer ..................................................................................................................................... 31
3.4.14. Frequency Error Indicator....................................................................................................................... 31
3.4.15. Automatic Frequency Correction ............................................................................................................ 32
3.4.16. Optimized Setup for Low Modulation Index Systems ............................................................................. 33
3.4.17. Temperature Sensor ............................................................................................................................... 34
3.4.18. Timeout Function.................................................................................................................................... 34
4. Operating Modes .................................................................................................................................................. 35
4.1. Basic Modes.................................................................................................................................................. 35
4.2. Automatic Sequencer and Wake-Up Times .................................................................................................. 35
4.2.1. Transmitter Startup Time ...........................................................................................................................36
4.2.2. Tx Start Procedure ................................................................................................................................... 36
4.2.3. Receiver Startup Time.............................................................................................................................. 36
4.2.4. Rx Start Procedure................................................................................................................................... 38
4.2.5. Optimized Frequency Hopping Sequences .............................................................................................. 38
4.3. Listen Mode................................................................................................................................................... 39
4.3.1. Timings..................................................................................................................................................... 39
4.3.2. Criteria ...................................................................................................................................................... 40
4.3.3. End of Cycle Actions ................................................................................................................................ 40
4.3.4. Stopping Listen Mode............................................................................................................................... 41
4.3.5. RC Timer Accuracy .................................................................................................................................. 41
4.4. AutoModes .................................................................................................................................................... 42
5. Data Processing.................................................................................................................................................... 43
5.1. Overview ....................................................................................................................................................... 43
5.1.1. Block Diagram .......................................................................................................................................... 43
5.1.2. Data Operation Modes ............................................................................................................................. 43
5.2. Control Block Description.............................................................................................................................. 44
5.2.1. SPI Interface............................................................................................................................................. 44
5.2.2. FIFO ......................................................................................................................................................... 45
5.2.3. Sync Word Recognition ............................................................................................................................ 46
5.2.4. Packet Handler ......................................................................................................................................... 47
5.2.5. Control ...................................................................................................................................................... 47
5.3. Digital IO Pins Mapping................................................................................................................................. 47
5.3.1. DIO Pins Mapping in Continuous Mode ................................................................................................... 48
5.3.2. DIO Pins Mapping in Packet Mode .......................................................................................................... 48
5.4. Continuous Mode .......................................................................................................................................... 49
5.4.1. General Description.................................................................................................................................. 49
5.4.2. Tx Processing........................................................................................................................................... 49