LLCC68 datasheet(82/111 Pages) SEMTECH

82 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

82 of 111

Semtech

LLCC68

www.semtech.com

13.4 RF Modulation and Packet-Related Functions

13.4.1 SetRfFrequency

The command SetRfFrequency(...) sets the frequency of the RF frequency mode.

The LSB of Freq is equal to the PLL step:

SetRfFrequency(...)

defines the chip frequency in FS, TX and RX modes. In RX, the required IF frequency offset is automatically

configured.

13.4.2 SetPacketType

The command SetPacketType(...) sets the LLCC68 radio in LoRa, or FSK, mode. The command SetPacketType(...) must be the

first of the radio configuration sequence. The parameter for this command is PacketType.

Changing from one mode of operation to another is done using the command SetPacketType(...). The parameters from the previous

mode are not kept internally. The switch from one packet type to another must be done in STDBY_RC mode.

Table 13-36: SetRfFrequency SPI Transaction

Byte

1-4

Data from host

Opcode = 0x86

RfFreq(31:0)

Table 13-37: SetPacketType SPI Transaction

Byte

Data from host

Opcode = 0x8A

PacketType

Table 13-38: PacketType Definition

PacketType

Value

Modem Mode of Operation

PACKET_TYPE_GFSK

0x00

GFSK packet type

PACKET_TYPE_LoRa

0x01

LoRa mode

RFfrequency

RFFreq*FXTAL

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