Datasheet

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SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
7.4. Top Sequencer: Beacon Mode
In this mode, a single message is periodically re-transmitted. If the Payload being sent is always identical and
PayloadLength is smaller than the FIFO size, the use of the BeaconOn bit in RegPacketConfig2 together with the
Sequencer permit to achieve periodic beacon without any user intervention.
7.4.1. Timing diagram
In this mode, the Radio is switched to Transmit mode every T
Timer1
+ T
Timer2
and back to Idle mode after PacketSent, as
shown in the diagram below. The Sequencer insures minimal time is spent in Transmit mode and therefore power
consumption is optimized.
Figure 56. Beacon Mode Timing Diagram
7.4.2. Sequencer Configuration
The Beacon mode state machine is presented in the following graph. It should be noted that the sequencer enters an
infinite loop and can only be stopped by setting SequencerStop bit in RegSeqConfig1.
Figure 57. Beacon Mode State Machine
Beacon mode
Transmit TransmitIdle ( Sleep + RC )Idle Idle
Timer2
Timer1 Timer1Timer1
Timer2
Packet
Sent
Packet
Sent
State Machine
Transmit
On T1
FromIdle = 0
On PacketSent
FromTransmit = 0
LowPower
Selection
Idle
LowPowerSelection = 1
IdleMode = 1 : Sleep
Start
FromStart = 00
Sequencer Off
&
Initial mode = Sleep or Standby
Start bit set