LLCC68 datasheet(94/106 Pages) SEMTECH

94 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

94 of 106

Semtech

www.semtech.com

14. Application

14.1 HOST API Basic Read Write Function

The communication with the LLCC68 is organized around generic functions which allow the user to control the device

behavior. Each function is based on an Operational Command (refer throughout this document as “Opcode”), which is then

followed by a set of parameters. The LLCC68 use the BUSY pin to indicate the status of the chip. In the following chapters,

it is assumed that host micro-controller 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 the command SetStandby(...)

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

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

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

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

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

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

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

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

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

DIO2 or DIO3)

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

12. Set the circuit in transmitter mode to start transmission with the 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

Please refer to Section 15.1

Please refer toSection 15.2

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