SX1272/73 WIRELESS & SENSING PRODUCTS DATASHEET SX1272/73 - 860 MHz to 1020 MHz Low Power Long Range Transceiver GENERAL DESCRIPTION KEY PRODUCT FEATURES TM TM LoRa Modem The SX1272/73 transceivers feature the LoRa long range modem that provides ultra-long range spread spectrum 157 dB maximum link budget communication and high interference immunity whilst +20 dBm at 100 mW constant RF output vs. V supply minimising current consumption. +14 dBm high efficiency PA TM Using Semtechs patented LoRa modulation technique SX1272/73 can achieve a sensitivity of over -137 dBm using Programmable bit rate up to 300 kbps a low cost crystal and bill of materials. The high sensitivity High sensitivity: down to -137 dBm combined with the integrated +20 dBm power amplifier Bullet-proof front end: IIP3 = -12.5 dBm yields industry leading link budget making it optimal for any TM application requiring range or robustness. LoRa also 89 dB blocking immunity provides significant advantages in both blocking and Low RX current of 10 mA, 100 nA register retention selectivity over conventional modulation techniques, solving Fully integrated synthesizer with a resolution of 61 Hz the traditional design compromise between range, TM interference immunity and energy consumption. FSK, GFSK, MSK, GMSK, LoRa and OOK modulation These devices also support high performance (G)FSK Built-in bit synchronizer for clock recovery modes for systems including WMBus, IEEE802.15.4g. The Preamble detection SX1272/73 deliver exceptional phase noise, selectivity, receiver linearity and IIP3 for significantly lower current 127 dB Dynamic Range RSSI consumption than competing devices. Automatic RF Sense and CAD with ultra-fast AFC Packet engine up to 256 bytes with CRC ORDERING INFORMATION Built-in temperature sensor and low battery indicator Part Number Delivery MOQ / Multiple APPLICATIONS SX1272IMLTRT T&R 3000 pieces Automated Meter Reading SX1273IMLTRT T&R 3000 pieces Home and Building Automation Wireless Alarm and Security Systems QFN 28 Package - Operating Range from -40 to +85C Industrial Monitoring and Control Pb-free, Halogen free, RoHS/WEEE compliant product Long range Irrigation Systems Rev. 4 - January 2019 Page 1 www.semtech.com 2019 Semtech CorporationSX1272/73 WIRELESS & SENSING PRODUCTS DATASHEET Table of contents Section Page 1. General Description ............................................................................................................................................... 10 1.1. Simplified Block Diagram ............................................................................................................................... 10 1.2. Product Versions ............................................................................................................................................11 1.3. Pin Diagram ................................................................................................................................................... 11 1.4. Pin Description ...............................................................................................................................................12 1.5. Package Marking ...........................................................................................................................................13 2. Electrical Characteristics ....................................................................................................................................... 14 2.1. ESD Notice .................................................................................................................................................... 14 2.2. Absolute Maximum Ratings ........................................................................................................................... 14 2.3. Operating Range............................................................................................................................................ 14 2.4. Thermal Properties ........................................................................................................................................ 14 2.5. Chip Specification ..........................................................................................................................................15 2.5.1. Power Consumption.................................................................................................................................. 15 2.5.2. Frequency Synthesis................................................................................................................................. 15 2.5.3. FSK/OOK Mode Receiver ......................................................................................................................... 16 2.5.4. FSK/OOK Mode Transmitter ..................................................................................................................... 17 2.5.5. Electrical specification for LoRaTM modulation ........................................................................................ 18 2.5.6. Digital Specification................................................................................................................................... 20 3. SX1272/73 Features.............................................................................................................................................. 21 3.1. LoRaTM Modem ............................................................................................................................................ 22 3.2. FSK/OOK Modem .......................................................................................................................................... 22 4. SX1272/73 Digital Electronics ............................................................................................................................... 23 4.1. The LoRaTM Modem ..................................................................................................................................... 23 4.1.1. Link Design Using the LoRaTM Modem ....................................................................................................24 4.1.1.1. Overview ........................................................................................................................................... 24 4.1.1.2. Spreading Factor............................................................................................................................... 25 4.1.1.3. Coding Rate ...................................................................................................................................... 25 4.1.1.4. Signal Bandwidth .............................................................................................................................. 26 4.1.1.5. LoRaTM Transmission Parameter Relationship ............................................................................... 26 4.1.1.6. LoRaTM Packet Structure .................................................................................................................27 4.1.1.7. Time on air ........................................................................................................................................ 29 4.1.1.8. Frequency Hopping with LoRaTM..................................................................................................... 29 4.1.2. LoRaTM Digital Interface ...........................................................................................................................31 4.1.2.1. LoRaTM Configuration Registers...................................................................................................... 31 4.1.2.2. Status Registers................................................................................................................................ 31 4.1.2.3. LoRaTM Mode FIFO Data Buffer ...................................................................................................... 31 4.1.2.4. Interrupts in LoRa Mode.................................................................................................................... 32 4.1.3. Operation of the LoRaTM Modem............................................................................................................. 33 4.1.3.1. Operating Mode Control.................................................................................................................... 33 4.1.4. Frequency Settings ...................................................................................................................................34 4.1.5. Frequency Error Indication........................................................................................................................ 34 4.1.6. LoRaTM Modem State Machine Sequences .............................................................................................35 Rev. 4 - January 2019 Page 2 www.semtech.com 2019 Semtech Corporation