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 119
SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
Figure 54. Listen Mode with Preamble Received & Valid SyncAddress
7.3.2.2. Sequencer Configuration
The following graph shows Listen mode - Wake on SyncAddress state machine:
Figure 55. Wake On SyncAddress State Machine
This example configuration is achieved as follows:
Table 45 Listen Mode with SyncAddress Condition Settings
Variable Effect
IdleMode 1: Sleep mode
FromStart 00: To LowPowerSelection
Wanted Signal
Preamble ( Preamble + Sync = T2 )
Sync
Word
Payload Crc
Preamble
Detect
ReceiveIdle
Timer2
Timer1
Sync
Address
Fifo
Level
RxTimeout
State Machine
LowPower
Selection
Idle
ReceiveRxTimeout
LowPowerSelection = 1
FromRxTimeout = 10
On RxTimeout
On T2
On T1
FromIdle = 1
On SyncAdress
FromReceive = 101
Sequencer Off
IdleMode = 1 : Sleep
Start
FromStart = 00
Sequencer Off
&
Initial mode = Sleep or Standby
Start bit set