LLCC68 datasheet(95/106 Pages) SEMTECH

95 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

95 of 106

Semtech

www.semtech.com

14.3 Circuit Configuration for Basic Rx Operation

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

valid for all protocols.

After power up (battery insertion or hard reset) the chip run 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 set the circuit in 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 where the data will be stored inside the data buffer in Rx with the command SetBufferBaseAddress(...)

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

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

7. Configure DIO and IRQ: use the command SetDioIrqParams(...) to select the IRQ RxDone and map this IRQ to a DIO

(DIO1 or DIO2 or DIO3), set IRQ Timeout as well.

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

9. Set the circuit in reception mode: use the command SetRx(). Set the parameter to enable timeout or continuous mode

10. Wait for IRQ RxDone2 or Timeout: the chip will stay in Rx and look for a new packet if the continuous mode is selected

otherwise it will goes to STDBY_RC mode.

11. In case of the IRQ RxDone, check the status to ensure CRC is correct: use the command GetIrqStatus()

Note:

The IRQ RxDone means that a packet has been received but the CRC could be wrong: the user must check the CRC before

validating the packet.

12. Clear IRQ flag RxDone or Timeout: use the command ClearIrqStatus(). In case of a valid packet (CRC OK), get the packet

length and address of the first byte of the received payload by using the command GetRxBufferStatus(...)

13. In case of a valid packet (CRC OK), start reading the packet

14.4 Issuing Commands in the Right Order

Most of the commands can be sent in any order except for the radio configuration commands which will set the radio in

the proper operating mode. Indeed, it is mandatory to set the radio protocol using the command SetPacketType(...) as a first

step before issuing any other radio configuration commands. In a second step, the user should define the modulation

parameter according to the chosen protocol with the command SetModulationParams(...). Finally, the user should then

select the packet format with the command SetPacketParams(...).

Note:

If this order is not respected, the behavior of the device could be unexpected.

Please refer to Section 15.4

Please refer to Section 15.3

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