LLCC68 datasheet(4/111 Pages) SEMTECH

4 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

4 of 111

Semtech

LLCC68

www.semtech.com

6.2 FSK Modem ................................................................................................................ 39

6.2.1 Modulation Parameter.................................................................................... 39

6.2.2 FSK Packet Engine............................................................................................ 41

6.2.3 FSK Packet Format........................................................................................... 42

6.2.4 Special Settings for BRF= 0.6kbps and 1.2kbps ............................................... 45

7. Data Buffer ........................................................................................................................... 46

7.1 Principle of Operation ............................................................................................... 46

7.2 Data Buffer in Receive Mode ..................................................................................... 47

7.3 Data Buffer in Transmit Mode ................................................................................... 47

7.4 Using the Data Buffer ................................................................................................ 47

8. Digital Interface and Control ................................................................................................ 48

8.1 Reset .......................................................................................................................... 48

8.2 SPI Interface ............................................................................................................... 48

8.2.1 SPI Timing When the Transceiver is in Active Mode ....................................... 48

8.2.2 SPI Timing When the Transceiver Leaves Sleep Mode.................................... 49

8.3 Multi-Purpose Digital Input/Output (DIO) ................................................................. 50

8.3.1 BUSY Control Line............................................................................................ 50

8.3.2 Digital Input/Output........................................................................................ 52

8.4 Digital Interface Status versus Chip modes ............................................................... 52

8.5 IRQ Handling .............................................................................................................. 53

8.6 DIO3 as a Manual Switch Control .............................................................................. 54

9. Operational Modes............................................................................................................... 55

9.1 Startup ....................................................................................................................... 55

9.2 Calibration ................................................................................................................. 55

9.2.1 Image Calibration for Specific Frequency Bands ............................................. 56

9.3 Sleep Mode ................................................................................................................ 56

9.4 Standby (STDBY) Mode .............................................................................................. 57

9.5 Frequency Synthesis (FS) Mode ................................................................................. 57

9.6 Receive (RX) Mode .................................................................................................... 57

9.7 Transmit (TX) Mode ................................................................................................... 58

9.7.1 PA Ramping ..................................................................................................... 58

9.8 Active Mode Switching Time ..................................................................................... 58

9.9 Transceiver Circuit Modes Graphic ............................................................................ 59

10. Host Controller Interface.................................................................................................... 60

10.1 Command Structure ................................................................................................ 60

10.2 Transaction Termination ......................................................................................... 60

11. List of Commands............................................................................................................... 61

11.1 Operational Modes Commands ............................................................................... 61

11.2 Register and Buffer Access Commands ................................................................... 62

11.3 DIO and IRQ Control ................................................................................................ 62

11.4 RF, Modulation and Packet Commands .................................................................. 62

11.5 Status Commands .................................................................................................... 63

12. Register Map ...................................................................................................................... 64

13. Commands Interface .......................................................................................................... 66

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