Data Sheet

Page 115
RFM95/96/97/98
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WIRELESS & SENSING 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 m ode
Idle Transmit Idle ( Sleep + RC ) Transmit Idle
Timer1
Timer2 Timer2
Timer1 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 M ach ine
Sequencer Off
&
Initial mode = Sleep or Standby
Start bit set
IdleMode = 1 : Sleep
Start
FromStart = 00
LowPower
Selection
LowPowerSelection = 1
Idle
On T1
FromIdle = 0
On PacketSent
FromTransmit = 0
Transmit
Figure 53. Beacon Mode State Machine