RFM23 Datasheet, PDF (61/152 Pages) –

RFM23
8.7. Low Duty Cycle Mode
The Low Duty Cycle Mode is available to automatically wake-up the receiver to check if a valid signal is available.
The basic operation of the low duty cycle mode is demonstrated in the figure below. If a valid preamble or sync
word is not detected the module will return to sleep mode until the beginning of a new WUT period. If a valid
preamble and sync are detected the receiver on period will be extended for the low duty cycle mode duration (TLDC)
to receive all of the packet. The time of the TLDC is determined by the formula below:
4×2^R
TLDC = ldc[7 : 0]×_32.768 ms
Figure 29. Low Duty Cycle Mode
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