LLCC68 datasheet(99/111 Pages) SEMTECH

99 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

99 of 111

Semtech

LLCC68

www.semtech.com

14. Application

14.1 HOST API Basic Read Write Function

Communication with the LLCC68 is organized around generic functions which allow users to control the device behavior. Each function is

based on an Operational Command (referred to throughout this document as “Opcode”) followed by a set of parameters. The LLCC68 uses

the BUSY pin to indicate the status of the chip. In the following chapters, it is assumed that host microcontroller has an SPI and access to it

via spi.write(data). Data is an 8-bit word. The SPI chip select is defined by NSS, active low.

14.2 Circuit Configuration for Basic Tx Operation

This chapter describes the sequence of operations needed to send or receive a frame starting from a power up.

After power up (battery insertion or hard reset) the chip runs automatically a calibration procedure and goes to STDBY_RC mode. This is

indicated by a low state on BUSY pin. From this state the steps are:

1. If not in STDBY_RC mode, then go to this mode with command SetStandby(...)

2. Define the protocol (LoRa or FSK) with command SetPacketType(...)

3. Define the RF frequency with command SetRfFrequency(...)

4. Define the Power Amplifier configuration with command SetPaConfig(...)

5. Define output power and ramping time with command SetTxParams(...)

6. Define where the data payload is stored with command SetBufferBaseAddress(...)

7. Send the payload to the data buffer with command WriteBuffer(...)

8. Define the modulation parameter according to the chosen protocol with command SetModulationParams(...)1

9. Define the frame format to be used with command SetPacketParams(...)2

10. Configure DIO and IRQ: use command SetDioIrqParams(...) to select TxDone IRQ and map this IRQ to a DIO (DIO1, DIO2 or DIO3)

11. Define Sync Word value: use command WriteReg(...) to write the value of the register via direct register access

12. Set the circuit in transmitter mode to start transmission with command SetTx(). Use the parameter to enable Timeout

13. Wait for the IRQ TxDone or Timeout: once the packet has been sent the chip goes automatically to STDBY_RC mode

14. Clear the IRQ TxDone flag

1. Please refer to Section 15.1

2. Please refer to Section 15.2

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