SX1235 Ver la hoja de datos (PDF) - Semtech Corporation
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SX1235 Datasheet PDF : 104 Pages
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SX1235
WIRELESS & SENSING
Table of contents
Section
DATASHEET
Page
3.5.1. Overview ................................................................................................................................................... 32
3.5.2. Automatic Gain Control - AGC .................................................................................................................. 32
3.5.3. RSSI .......................................................................................................................................................... 33
3.5.4. Channel Filter ............................................................................................................................................ 34
3.5.5. FSK Demodulator...................................................................................................................................... 35
3.5.6. OOK Demodulator..................................................................................................................................... 35
3.5.7. Bit Synchronizer ........................................................................................................................................ 37
3.5.8. Frequency Error Indicator.......................................................................................................................... 37
3.5.9. AFC ...........................................................................................................................................................39
3.5.10. Preamble Detector .................................................................................................................................. 39
3.5.11. Image Rejection Mixer .............................................................................................................................40
3.5.12. Image and RSSI Calibration.................................................................................................................... 40
3.6. Temperature Measurement ........................................................................................................................... 40
3.7. Timeout Function ........................................................................................................................................... 41
4. Operating Modes ................................................................................................................................................... 42
4.1. General Overview .......................................................................................................................................... 42
4.2. Startup Times................................................................................................................................................. 42
4.2.1. Transmitter Startup Time ...........................................................................................................................43
4.2.2. Receiver Startup Time............................................................................................................................... 43
4.2.3. Time to RSSI Evaluation ........................................................................................................................... 44
4.2.4. Tx to Rx Turnaround Time ........................................................................................................................ 44
4.2.5. Rx to Tx ..................................................................................................................................................... 44
4.2.6. Receiver Hopping, Rx to Rx ......................................................................................................................45
4.2.7. Tx to Tx ..................................................................................................................................................... 45
4.3. Receiver Startup Options ...............................................................................................................................46
4.4. Receiver Restarting Methods......................................................................................................................... 46
4.4.1. Restart Upon User Request ...................................................................................................................... 46
4.4.2. Automatic Restart after valid Packet Reception ........................................................................................47
4.4.3. Automatic Restart when Packet Collision is Detected............................................................................... 47
4.5. Top Level Sequencer .....................................................................................................................................48
4.5.1. Sequencer States...................................................................................................................................... 48
4.5.2. Sequencer Transitions ..............................................................................................................................49
4.5.3. Timers ....................................................................................................................................................... 50
4.5.4. Sequencer State Machine .........................................................................................................................51
5. Data Processing .................................................................................................................................................... 52
5.1. Overview ........................................................................................................................................................ 52
5.1.1. Block Diagram ........................................................................................................................................... 52
5.1.2. Data Operation Modes .............................................................................................................................. 52
5.2. Control Block Description............................................................................................................................... 53
Rev 1 - December 2012
Page 3
www.semtech.com
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