LLCC68 datasheet(78/106 Pages) SEMTECH

78 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

78 of 106

Semtech

www.semtech.com

13.4 RF Modulation and Packet-Related Functions

13.4.1 SetRfFrequency

The command SetRfFrequency(...) is used to set the frequency of the RF frequency mode.

The LSB of Freq is equal to the PLL step which is:

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 in 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 frame 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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