RFM95 Datasheet, PDF (115/121 Pages) List of Unclassifed Manufacturers – Low Power Long Range Transceiver Module

WIRELESS & SENSING
RFM95/96/97/98(W)
PRELIMINARY
DATASHEET
7.4. Top Sequencer: Beacon Mode
In this mode, a repetitive message is transmitted periodically. 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.
Beacon mode
Idle Transmit
Timer1
Timer2
Idle ( Sleep + RC )
Timer1
Transmit
Timer2
Idle
Timer1
Packet
Sent
Packet
Sent
Figure 52. Beacon Mode Timing Diagram
7.4.2. Sequencer Configuration
The Beacon mode state machine is presented in the following graph. It is noticeable that the sequencer enters an infinite
loop and can only be stopped by setting SequencerStop bit in RegSeqConfig1.
State Machine
Sequencer Off
&
Initial mode = Sleep or Standby
Start bit set
IdleMode = 1 : Sleep
Start
FromStart = 00
LowPower ^{LowPowerSelection = 1}
Selection
Idle
On T1
FromIdle = 0
On PacketSent
FromTransmit = 0
Transmit
Figure 53. Beacon Mode State Machine
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