Introduction; Scope; Overview; Figure 1-1: Lr1121 Block Diagram - Semtech LR1121 User Manual

1. Introduction

1.1 Scope

This document provides complete information on how to use the LR1121 transceiver in an application. It covers both
hardware and software aspects. For LR1121 functionalities and circuit specifications, refer to the LR1121 Datasheet.
Balun
RFIO_HF
&
Match
RFI_N_LF0
RFI_P_LF0
RFO_LP_LF
RFO_HP_LF
VBAT_RF
VR_PA

1.2 Overview

The LR1121 chip is a long range, ultra-low power transceiver that provides ISM sub-GHz, a global 2.4 GHz band, and
1.9GHz-2.2GHz S-Band communication targeting terrestrial and satellite connectivity. For LPWAN use cases, the LR1121
supports LoRa® and (G)FSK and Long Range-Frequency Hopping Spread Spectrum (LR-FHSS) modulations. The device is
highly configurable over the 150 MHz-960MHz, 1.9-2.1GHz Satellite band and 2.4GHz ISM bands to meet different
application requirements utilizing the global LoRaWAN® Standard or proprietary protocols.
Besides the world-wide sub-GHz, 1.9-2.1GHz Satellite band and 2.4GHz transceiver capabilities, the LR1121 features a very
low power multi-band front-end.
LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
PA
HF
LNA
HF
ADC ADC
LNA
LF0
PA
LP LF
PLL
PA
HP LF
PDS
DC-DC
REG_PA REGs REGs
LDO

Figure 1-1: LR1121 Block Diagram

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LoRa LoRa (G)FSK (G)FSK
modem modem modem modem
BG/IREF
HFXOSC
HFRC
POR/
32MHz
32MHz
BRN
NVM
CPU
ROM RAM
CKS
LFXOSC LFRC
32kHz
32kHz
Proprietary & Confidential
DIO0/ BUSY
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
DIO8
DIO9
nRESET
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