Semtech SX1272
The SX1272/73 transceivers feature the LoRa® long range modem that provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption.
Using Semtech’s patented LoRa modulation technique SX1272/73 can achieve a sensitivity of over -137dBm using a low cost crystal and bill of materials. The high sensitivity combined with the integrated +20dBm power amplifier yields industry leading link budget making it optimal for any application requiring range or robustness. LoRa also provides significant advantages in both blocking and selectivity over conventional modulation techniques, solving the traditional design compromise between range, interference immunity and energy consumption.
Overview
Features
- LoRa Modem
- 157 dB maximum link budget
- +20 dBm at 100 mW constant RF output vs. V supply
- +14 dBm high efficiency PA
- Programmable bit rate up to 300 kbps
- High sensitivity: down to -137 dBm
- Bullet-proof front end: IIP3 = -12.5 dBm
- 89 dB blocking immunity
- Low RX current of 10 mA, 100 nA register retention
- Fully integrated synthesizer with a resolution of 61 Hz
- FSK, GFSK, MSK, GMSK, LoRa and OOK modulation
- Built-in bit synchronizer for clock recovery
- Preamble detection
- 127 dB Dynamic Range RSSI
- Automatic RF Sense and CAD with ultra-fast AFC
- Packet engine up to 256 bytes with CRC
- Built-in temperature sensor and low battery indicator
Applications
- Automated Meter Reading
- Home and Building Automation
- Wireless Alarm and Security Systems
- Industrial Monitoring and Control
- Long range Irrigation Systems
Packaging
- QFN 28
Order Codes
- SX1272IMLTRT - Pb-free, Halogen free, RoHS/WEEE compliant product
- SX1273IMLTRT- Pb-free, Halogen free, RoHS/WEEE compliant product
- SX1272DVK1BAS (868MHz)
- SX1272DVK1CAS (915MHz)
- SX1272RF1BAS (868MHz)
- SX1272RF1CAS (915MHz)
Diagrams and Specs
Block Diagram
Click diagram to enlarge
Datasheets and Resources
Application Notes
- AN1200.13 and AN1200.17 LoRa Modem Design
- AN1200.59 Selecting the Optimal Reference Clock
- APP Note Crystal Oscillator Guidance LoRa Modulation V2.2
- Designing for High Efficiency and Low-Harmonic Emissions
- ETSI Compliance of the SX1272/3 LoRa Modem
- LoRa and FCC Part 15.247: Measurement Guidance
- LoRa Modulation Basics
- LoRa Modulation: Crystal Oscillator Guide
- MCU Requirements for LoRaWAN
- Planar F-Antenna Reference Design
- Reading Channel RSSI During a CAD
- Recommended SX1272 Settings for EU868 LoRaWAN Network Operation
- Software Implementation of Data Whitening and CRC
- SX1272 LoRa Calculator
- SX127x Reference Design Overview
- Testing for FCC Pre-Compliance with LoRaWAN Modules
Datasheets
Errata
Reference Designs
- SX1272 Modules: SX1272MB1DCS - 868 MHz - Combined RFI and RFO, Switchless (Ref Design Only)
- SX1272 Modules: SX1272MB2DAS - 868 or 915 MHz - Combined RFI and RFO Design
- SX1272 Modules: SX1272RF1xAS - 868 or 915 MHz - Combined RFI and PA_BOOST Design
Software Releases (Firmware)
- Firmware Driver and LoRaWAN Stack V4.1.0
- Firmware Drivers V2.1.0 - LEGACY, DO NOT USE FOR NEW IMPLEMENTATION
- Packet Error Rate Firmware
- PC GUI (2.0.0.Beta3)