LLCC68 datasheet(69/106 Pages) SEMTECH

69 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

69 of 106

Semtech

www.semtech.com

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 to generate an infinite sequence of alternating zeros and ones in FSK modulation.

In LoRa®, the radio is only able to constantly modulate LoRa® preamble symbols. The device will remain 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 will be able to easily monitor the spectral impact of its modulation parameters.

13.1.11 SetRegulatorMode

By default only the LDO is used. This is useful in low cost applications where the cost of the extra self needed for a DC-DC

converter is prohibitive. Using only a linear regulator implies that the RX or TX current is almost doubled. This function

allows to specify if DC-DC or LDO is used for power regulation. The regulation mode is defined by parameter

regModeParam.

Note:

This function is clearly related to the hardware implementation of the device. The user should always use this command

while knowing what has been implemented at the hardware level.

Table 13-15: SendTxInfinitePreamble SPI Transaction

Byte

Data from host

Opcode = 0xD2

Table 13-16: SetRegulatorMode SPI Transaction

Byte

Data from host

Opcode= 0x96

regModeParam

0: Only LDO used for all modes

1: DC_DC+LDO used for STBY_XOSC,FS, RX and TX modes

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