LLCC68 datasheet(73/111 Pages) SEMTECH

73 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

73 of 111

Semtech

LLCC68

www.semtech.com

13.1.8 SetCAD

The command SetCAD() can only be used in LoRa packet types. The Channel Activity Detection is a LoRa specific mode of operation where

the device searches for the presence of a LoRa preamble signal. After the search has completed, the device returns in STDBY_RC mode. The

length of the search is configured via the command SetCadParams(...). At the end of the search period, the device triggers the IRQ

CADdone if it has been enabled. If a valid signal has been detected it also generates the IRQ CadDetected.

13.1.9 SetTxContinuousWave

SetTxContinuousWave()

is a test command for all packet types to generate a continuous wave (RF tone) at selected frequency and

output power. The device stays in TX continuous wave until the host sends a mode configuration command.

While this command has no real use case in real life, it can provide valuable help to the developer to check and monitor the performances

of the radio while in Tx mode.

13.1.10 SetTxInfinitePreamble

SetTxInfinitePreamble()

is a test command that generates an infinite sequence of alternating zeros and ones in FSK modulation. In

LoRa, the radio constantly modulates LoRa preamble symbols. The device remains in TX infinite preamble until the host sends a mode

configuration command.

While this command has no real use case in real life, it can provide valuable help to the developer to check and monitor the performances

of the radio while modulating in Tx mode.

However, when using this function, it is impossible to define any data sent by the device. In LoRa mode, the radio is only able to constantly

modulate LoRa preamble symbols and, in FSK mode, the radio is only able to generate FSK preamble (0x55). Nevertheless, the end user can

easily monitor the spectral impact of its modulation parameters.

Table 13-13: SetCAD SPI Transaction

Byte

Data from host

Opcode = 0xC5

Table 13-14: SetTxContinuousWave SPI Transaction

Byte

Data from host

Opcode = 0xD1

Table 13-15: SetTxInfinitePreamble SPI Transaction

Byte

Data from host

Opcode = 0xD2

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