SX1231
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
3.5.9. Cordic ....................................................................................................................................................... 26
3.5.10. FSK Demodulator................................................................................................................................... 27
3.5.11. OOK Demodulator.................................................................................................................................. 27
3.5.12. Bit Synchronizer ..................................................................................................................................... 29
3.5.13. Frequency Error Indicator....................................................................................................................... 30
3.5.14. Automatic Frequency Correction............................................................................................................ 31
3.5.15. Temperature Sensor .............................................................................................................................. 31
3.5.16. Timeout Function.................................................................................................................................... 32
Operating Modes .................................................................................................................................................. 33
4.
4.1.
4.2.
Basic Modes.................................................................................................................................................. 33
Automatic Sequencer and Wake-Up Times.................................................................................................. 33
4.2.1. Transmitter Startup Time........................................................................................................................... 34
4.2.2. Tx Start Procedure ................................................................................................................................... 34
4.2.3. Receiver Startup Time.............................................................................................................................. 34
4.2.4. Rx Start Procedure................................................................................................................................... 36
4.2.5. Optimized Frequency Hopping Sequences.............................................................................................. 36
4.3.
4.4.
Listen mode ................................................................................................................................................... 37
AutoModes.................................................................................................................................................... 40
5.
Data Processing.................................................................................................................................................... 41
5.1.
Overview ....................................................................................................................................................... 41
5.1.1. Block Diagram .......................................................................................................................................... 41
5.1.2. Data Operation Modes ............................................................................................................................. 41
5.2.
Control Block Description.............................................................................................................................. 42
5.2.1. SPI Interface............................................................................................................................................. 42
5.2.2. FIFO ......................................................................................................................................................... 43
5.2.3. Sync Word Recognition............................................................................................................................ 44
5.2.4. Packet Handler......................................................................................................................................... 45
5.2.5. Control...................................................................................................................................................... 45
5.3.
Digital IO Pins Mapping................................................................................................................................. 45
5.3.1. DIO Pins Mapping in Continuous Mode ................................................................................................... 46
5.3.2. DIO Pins Mapping in Packet Mode .......................................................................................................... 46
5.4.
Continuous Mode.......................................................................................................................................... 47
5.4.1. General Description.................................................................................................................................. 47
5.4.2. Tx Processing........................................................................................................................................... 47
5.4.3. Rx Processing .......................................................................................................................................... 48
5.5.
Packet Mode ................................................................................................................................................. 48
5.5.1. General Description.................................................................................................................................. 48
5.5.2. Packet Format .......................................................................................................................................... 49
5.5.3. Tx Processing (without AES).................................................................................................................... 51
5.5.4. Rx Processing (without AES) ................................................................................................................... 52
5.5.5. AES .......................................................................................................................................................... 52
5.5.6. Packet Filtering......................................................................................................................................... 54
Rev 2 - Nov 2009
Page 3
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