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 35
SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
4.1.6. LoRa
TM
Modem State Machine Sequences
The sequence for transmission and reception of data to and from the LoRa
TM
modem, together with flow charts of typical
sequences of operation, are detailed below.
Data Transmission Sequence
In transmit mode power consumption is optimized by enabling RF, PLL and PA blocks only when packet data needs to be
transmitted.
Figure 10 shows a typical LoRa
TM
transmit sequence.
Figure 10. LoRa
TM
modulation transmission sequence.
Static configuration registers can only be accessed in Sleep mode, Stand-by mode or FSTX mode.
The LoRa
TM
FIFO should only be filled in Stand-by mode and cannot be filled in Sleep mode.
Data transmission is initiated by sending TX mode request.
Upon completion the TxDone interrupt is issued and the radio returns to Stand-by mode.
Following transmission the radio can be manually placed in Sleep mode or the FIFO refilled for a subsequent Tx
operation.