LLCC68
Data Sheet Rev. 1.0
DS.LLCC68.W.APP July 2019
4 of 106
Semtech
www.semtech.com
6.2.3 FSK Packet Format .............................................................................................................. 40
7. Data Buffer ...................................................................................................................................................... 43
7.1 Principle of Operation .................................................................................................................... 43
7.2 Data Buffer in Receive Mode ....................................................................................................... 44
7.3 Data Buffer in Transmit Mode ..................................................................................................... 44
7.4 Using the Data Buffer ..................................................................................................................... 44
8. Digital Interface and Control .................................................................................................................... 45
8.1 Reset ..................................................................................................................................................... 45
8.2 SPI Interface ....................................................................................................................................... 45
8.2.1 SPI Timing When the Transceiver is in Active Mode............................................... 45
8.2.2 SPI Timing When the Transceiver Leaves Sleep Mode .......................................... 46
8.3 Multi-Purpose Digital Input/Output (DIO) ............................................................................. 47
8.3.1 BUSY Control Line ............................................................................................................... 47
8.3.2 Digital Input/Output .......................................................................................................... 49
8.4 Digital Interface Status versus Chip modes ........................................................................... 49
8.5 IRQ Handling ..................................................................................................................................... 50
9. Operational Modes ...................................................................................................................................... 51
9.1 Startup ................................................................................................................................................. 51
9.2 Calibration .......................................................................................................................................... 51
9.2.1 Image Calibration for Specific Frequency Bands..................................................... 51
9.3 Sleep Mode ........................................................................................................................................ 52
9.4 Standby (STDBY) Mode ................................................................................................................. 52
9.5 Frequency Synthesis (FS) Mode ................................................................................................. 53
9.6 Receive (RX) Mode .......................................................................................................................... 53
9.7 Transmit (TX) Mode ........................................................................................................................ 54
9.7.1 PA Ramping........................................................................................................................... 54
9.8 Active Mode Switching Time ...................................................................................................... 54
9.9 Transceiver Circuit Modes Graphical Illustration ................................................................. 55
10. Host Controller Interface......................................................................................................................... 56
10.1 Command Structure .................................................................................................................... 56
10.2 Transaction Termination ............................................................................................................ 56
11. List of Commands ...................................................................................................................................... 57
11.1 Operational Modes Commands ............................................................................................... 57
11.2 Register and Buffer Access Commands ................................................................................ 58
11.3 DIO and IRQ Control ..................................................................................................................... 58
11.4 RF, Modulation and Packet Commands ................................................................................ 58
11.5 Status Commands ......................................................................................................................... 59
12. Register Map ................................................................................................................................................ 60
12.1 Register Table ................................................................................................................................. 60
13. Commands Interface................................................................................................................................. 62
13.1 Operational Modes Functions .................................................................................................. 62
13.1.1 SetSleep................................................................................................................................ 62
13.1.2 SetStandby.......................................................................................................................... 63
13.1.3 SetFs....................................................................................................................................... 63
13.1.4 SetTx ...................................................................................................................................... 63
13.1.5 SetRx...................................................................................................................................... 64
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