LLCC68 datasheet(68/106 Pages) SEMTECH

68 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

68 of 106

Semtech

www.semtech.com

Figure 13-3: RX Duty Cycle when Receiving

Note: when using a TCXO controlled by the LLCC68 itself, the startup delay defined in delay(23:0) will be added

between the Sleep and Rx periods

13.1.8 SetCAD

The command SetCAD() can be used only in LoRa® packet type. 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 available 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.

Table 13-13: SetCAD SPI Transaction

Byte

Data from host

Opcode = 0xC5

Table 13-14: SetTxContinuousWave SPI Transaction

Byte

Data from host

Opcode = 0xD1

time

Radio Current

Preamble Detected

2 x rxPeriod + sleepPeriod

Radio in RX mode

Radio in STDBY_RC

500 us

Radio in SLEEP mode

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