LLCC68 datasheet(88/106 Pages) SEMTECH

88 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

88 of 106

Semtech

www.semtech.com

Parameters cadDetPeak and cadDetMin define the sensitivity of the LoRa modem when trying to correlate to actual LoRa

preamble symbols. These two settings depend on the LoRa spreading factor and Bandwidth, but also depend on the

number of symbols used to validate or not the detection.

Choosing the right value is not easy and the values selected must be carefully tested to ensure a good detection at

sensitivity level, and also to limit the number of false detections. Application note AN1200.48 provides guidance for the

selection of these parameters.

The parameter cadExitMode defines the action to be done after a CAD operation. This is optional.

The parameter cadTimeout is only used when the CAD is performed with cadExitMode = CAD_RX. Here, the cadTimeout

indicates the time the device will stay in Rx following a successful CAD.

Rx Timeout = cadTimeout * 15.625

13.4.8 SetBufferBaseAddress

This command sets the base addresses in the data buffer in all modes of operations for the packet handing operation in TX

and RX mode. The usage and definition of those parameters are described in the different packet type sections.

CAD_ON_8_SYMB

0x03

CAD_ON_16_SYMB

0x04

Table 13-73: CAD Exit Mode Definition

cadExitMode

Value

Operation

CAD_ONLY

0x00

The chip performs the CAD operation in

LoRa®. Once done and whatever the

activity on the channel, the chip goes back to STBY_RC mode.

CAD_RX

0x01

The chip performs a CAD operation and if an activity is detected, it stays in RX until

a packet is detected or the timer reaches the timeout defined by

cadTimeout * 15.625 us

Table 13-74: SetBufferBaseAddress SPI Transaction

Byte

Data from host

Opcode = 0x8F

TX base address

RX base address

Table 13-72: CAD Number of Symbol Definition

cadSymbolNum

Value

Number of Symbols used for CAD

LLCC68 Datasheet(PDF) 88 Page - Semtech Corporation

LLCC68 Datasheet(HTML) 88 Page - Semtech Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL