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 33
SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
4.1.3. Operation of the LoRa
TM
Modem
4.1.3.1. Operating Mode Control
The operating modes of the LoRa
TM
modem are accessed by enabling LoRa
TM
mode (setting the LongRangeMode bit of
RegOpMode). Depending upon the operating mode selected the range of functionality and register access is given by the
following table:
Table 15 LoRa
TM
Operating Mode Functionality
It is possible to access any mode from any other mode by changing the value in the RegOpMode register.
Operating Mode Description
SLEEP
Low-power mode. In this mode only SPI and configuration registers are accessible. Lora FIFO is not
accessible.
Note that this is the only mode permissible to switch between FSK/OOK mode and LoRa mode.
STAND-BY Both crystal oscillator and LoRa baseband blocks are turned on. RF front-end and PLLs are disabled
FSTX
This is a frequency synthesis mode for transmission. The PLL selected for transmission is locked and active
at the transmit frequency. The RF front-end is off.
FSRX
This is a frequency synthesis mode for reception. The PLL selected for reception is locked and active at the
receive frequency. The RF front-end is off.
TX
When activated the SX1272/73 powers all remaining blocks required for transmit, ramps the PA, transmits
the packet and returns to Stand-by mode.
RXCONTINUOUS
When activated the SX1272/73 powers all remaining blocks required for reception, processing all received
data until a new user request is made to change operating mode.
RXSINGLE
When activated the SX1272/73 powers all remaining blocks required for reception, remains in this state until
a valid packet has been received and then returns to Stand-by mode.
CAD When in CAD mode, the device will check a given channel to detect LoRa preamble signal