LLCC68 datasheet(7/111 Pages) SEMTECH

7 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

7 of 111

Semtech

LLCC68

www.semtech.com

List of Figures

Figure 2-1: LLCC68 Top View Pin Location QFN 4x4 24L ......................................................... 13

Figure 4-1: LLCC68 Block Diagram........................................................................................... 22

Figure 4-2: TCXO Control Block ............................................................................................... 24

Figure 4-3: PA Supply Scheme in DC-DC Mode ....................................................................... 27

Figure 4-4: VR_PA versus Output Power on the LLCC68 ......................................................... 28

Figure 4-5: Power Linearity on the LLCC68 ............................................................................. 29

Figure 4-6: Current versus Programmed Output Power on the LLCC68 ................................. 29

Figure 5-1: LLCC68 Diagram with the DC-DC Regulator Power Option................................... 32

Figure 5-2: LLCC68 Diagram with the LDO Regulator Power Option....................................... 32

Figure 5-3: Separate DIO Supply ............................................................................................. 33

Figure 6-1: LoRa® Signal Bandwidth........................................................................................ 35

Figure 6-2: LoRa Packet Format .............................................................................................. 36

Figure 6-3: Fixed-Length Packet Format.................................................................................. 42

Figure 6-4: Variable-Length Packet Format............................................................................. 42

Figure 6-5: Data Whitening LFSR............................................................................................. 43

Figure 7-1: Data Buffer Diagram.............................................................................................. 46

Figure 8-1: SPI Timing Diagram ............................................................................................... 48

Figure 8-2: SPI Timing Transition............................................................................................. 49

Figure 8-3: Switching Time Definition ..................................................................................... 50

Figure 8-4: Switching Time Definition in Active Mode............................................................ 50

Figure 9-1: Transceiver Circuit Modes..................................................................................... 59

Figure 13-1: Stopping Timer on Preamble or Header Detection............................................. 70

Figure 13-2: RX Duty Cycle Energy Profile............................................................................... 72

Figure 13-3: RX Duty Cycle when Receiving ............................................................................ 72

Figure 14-1: Application Schematic of the LLCC68 with RF Switch ....................................... 101

Figure 16-1: QFN 4x4mm Package Outline Drawing ............................................................. 105

Figure 16-2: LLCC68 Marking................................................................................................. 106

Figure 16-3: QFN 4x4mm Land Pattern Drawing................................................................... 106

Figure 16-4: Tape and Reel Drawing ..................................................................................... 107

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