Datasheet
Table Of Contents
- 1. General Description
- 2. Electrical Characteristics
- 3. SX1272/73 Features
- 4. SX1272/73 Digital Electronics
- 4.1. The LoRaTM Modem
- 4.2. FSK/OOK Modem
- 4.2.1. Bit Rate Setting
- 4.2.2. FSK/OOK Transmission
- 4.2.3. FSK/OOK Reception
- 4.2.4. Operating Modes in FSK/OOK Mode
- 4.2.5. General Overview
- 4.2.6. Startup Times
- 4.2.7. Receiver Startup Options
- 4.2.8. Receiver Restart Methods
- 4.2.9. Top Level Sequencer
- 4.2.10. Data Processing in FSK/OOK Mode
- 4.2.11. FIFO
- 4.2.12. Digital IO Pins Mapping
- 4.2.13. Continuous Mode
- 4.2.14. Packet Mode
- 4.2.15. io-homecontrol® Compatibility Mode
- 4.3. SPI Interface
- 5. SX1272/73 Analog & RF Frontend Electronics
- 6. Description of the Registers
- 7. Application Information
- 8. Packaging Information
- 9. Revision History
www.semtech.comPage 22
SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
The SX1272/73 are equipped with both standard FSK and long range spread spectrum (LoRa
TM
) modems. Depending
upon the mode selected either conventional OOK or FSK modulation may be employed or the LoRa
TM
spread spectrum
modem.
3.1. LoRa
TM
Modem
The LoRa
TM
modem uses a proprietary spread spectrum modulation technique. This modulation, in contrast to legacy
modulation techniques, permits an increase in link budget and increased immunity to in-band interference. At the same
time the frequency tolerance requirement of the crystal reference oscillator is relaxed - allowing a performance increase for
a reduction in system cost. For a fuller description of the design trade-offs and operation of the SX1272/73 please consult
Section
4.1 of the datasheet.
3.2. FSK/OOK Modem
In FSK/OOK mode the SX1272/73 supports standard modulation techniques including OOK, FSK, GFSK, MSK and
GMSK. The SX1272/73 is especially suited to narrow band communication thanks the low-IF architecture employed and
the built-in AFC functionality. For full information on the FSK/OOK modem please consult Section
4.2 of this document.