Datasheet

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Table of contents
SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
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