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SX1231
WIRELESS & SENSING PRODUCTS
Table of contents
Section
DATASHEET
Page
3.5.8. Complex Filter - OOK ................................................................................................................................ 29
3.5.9. RSSI .......................................................................................................................................................... 29
3.5.10. Cordic ...................................................................................................................................................... 30
3.5.11. FSK Demodulator ....................................................................................................................................31
3.5.12. OOK Demodulator................................................................................................................................... 31
3.5.13. Bit Synchronizer ...................................................................................................................................... 33
3.5.14. Frequency Error Indicator........................................................................................................................ 33
3.5.15. Automatic Frequency Correction............................................................................................................. 34
3.5.16. Optimized Setup for Low Modulation Index Systems.............................................................................. 35
3.5.17. Temperature Sensor ...............................................................................................................................36
3.5.18. Timeout Function..................................................................................................................................... 36
4.
Operating Modes ................................................................................................................................................... 37
4.1.
4.2.
Basic Modes .................................................................................................................................................. 37
Automatic Sequencer and Wake-Up Times................................................................................................... 37
4.2.1. Transmitter Startup Time ...........................................................................................................................38
4.2.2. Tx Start Procedure .................................................................................................................................... 38
4.2.3. Receiver Startup Time............................................................................................................................... 38
4.2.4. Rx Start Procedure.................................................................................................................................... 40
4.2.5. Optimized Frequency Hopping Sequences............................................................................................... 40
4.3.
Listen Mode ...................................................................................................................................................41
4.3.1. Timings...................................................................................................................................................... 41
4.3.2. Criteria....................................................................................................................................................... 42
4.3.3. End of Cycle Actions ................................................................................................................................. 42
4.3.4. Stopping Listen Mode................................................................................................................................ 43
4.3.5. RC Timer Accuracy ................................................................................................................................... 43
4.4.
AutoModes .....................................................................................................................................................44
5.
Data Processing .................................................................................................................................................... 45
5.1.
Overview ........................................................................................................................................................ 45
5.1.1. Block Diagram ........................................................................................................................................... 45
5.1.2. Data Operation Modes .............................................................................................................................. 45
5.2.
Control Block Description............................................................................................................................... 46
5.2.1. SPI Interface.............................................................................................................................................. 46
5.2.2. FIFO .......................................................................................................................................................... 47
5.2.3. Sync Word Recognition............................................................................................................................. 48
5.2.4. Packet Handler.......................................................................................................................................... 49
5.2.5. Control....................................................................................................................................................... 49
5.3.
Digital IO Pins Mapping ................................................................................................................................. 49
5.3.1. DIO Pins Mapping in Continuous Mode .................................................................................................... 50
5.3.2. DIO Pins Mapping in Packet Mode ........................................................................................................... 50
Rev. 7 - June 2013
Page 3
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