SX1232
WIRELESS & SENSING
DATASHEET
3.5.8. Frequency Error Indicator......................................................................................................................... 33
3.5.9. AFC .......................................................................................................................................................... 34
3.5.10. Preamble Detector ..................................................................................................................................35
3.5.11. Image Rejection Mixer............................................................................................................................ 35
3.5.12. Image and RSSI Calibration................................................................................................................... 35
3.6.
3.7.
Temperature Measurement........................................................................................................................... 36
Timeout Function .......................................................................................................................................... 37
4.
Operating Modes .................................................................................................................................................. 38
4.1.
4.2.
General Overview ......................................................................................................................................... 38
Startup Times................................................................................................................................................ 38
4.2.1. Transmitter Startup Time........................................................................................................................... 39
4.2.2. Receiver Startup Time.............................................................................................................................. 39
4.2.3. Time to RSSI Evaluation .......................................................................................................................... 40
4.2.4. Tx to Rx Turnaround Time ....................................................................................................................... 40
4.2.5. Rx to Tx .................................................................................................................................................... 40
4.2.6. Receiver Hopping, Rx to Rx ...................................................................................................................... 41
4.2.7. Tx to Tx .................................................................................................................................................... 41
4.3.
4.4.
Receiver Startup Options.............................................................................................................................. 42
Receiver Restarting Methods........................................................................................................................ 42
4.4.1. Restart Upon User Request ..................................................................................................................... 42
4.4.2. Automatic Restart after valid Packet Reception ........................................................................................ 43
4.4.3. Automatic Restart when Packet Collision is Detected.............................................................................. 43
4.5.
Top Level Sequencer .................................................................................................................................... 44
4.5.1. Sequencer States..................................................................................................................................... 44
4.5.2. Sequencer Transitions ..............................................................................................................................45
4.5.3. Timers ...................................................................................................................................................... 46
4.5.4. Sequencer State Machine .........................................................................................................................47
Data Processing.................................................................................................................................................... 48
5.
5.1.
Overview ....................................................................................................................................................... 48
5.1.1. Block Diagram .......................................................................................................................................... 48
5.1.2. Data Operation Modes ............................................................................................................................. 48
5.2.
Control Block Description.............................................................................................................................. 49
5.2.1. SPI Interface............................................................................................................................................. 49
5.2.2. FIFO ......................................................................................................................................................... 50
5.2.3. Sync Word Recognition............................................................................................................................ 51
5.2.4. Packet Handler......................................................................................................................................... 52
5.2.5. Control...................................................................................................................................................... 52
5.3.
5.4.
Digital IO Pins Mapping................................................................................................................................. 53
Continuous Mode.......................................................................................................................................... 54
5.4.1. General Description.................................................................................................................................. 54
5.4.2. Tx Processing........................................................................................................................................... 54
5.4.3. Rx Processing .......................................................................................................................................... 55
Rev 3 - August 2012
Page 3
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