Data Sheet

Page 114
RFM95/96/97/98(W)
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WIRELESS & SENSING PRELIMINARY DATASHEET
This example configuration is achieved as follows:
Table 92 Listen Mode with SyncAddress Condition Settings
Variable Effect
IdleMode 1: Sleep mode
FromStart 00: To LowPowerSelection
LowPowerSelection 1: To Idle state
FromIdle 1: To Receive state on T1 interrupt
FromReceive 101: To Sequencer off on SyncAddress interrupt
FromRxTimeout 10: To LowPowerSelection
T
TimeoutRxPreamble
should be set to just long enough to catch a preamble (depends on PreambleDetectSize and BitRate).
T
Timer1
should be set to 64 µs (shortest possible duration).
T
Timer2
is set so that T
Timer1 +
T
Timer2
defines the time between two start of reception.
In order to insure packet detection and optimize the receiver power consumption, the received packet Preamble should be
defined so that T
Preamble =
T
Timer2
- T
SyncAddress
with T
SyncAddress
= (SyncSize + 1)*8/BitRate.
An example of DIO configuration for this mode is described in the following table:
Table 93 Listen Mode with PreambleDetect Condition Recommended DIO Mapping
DIO Value Description
0 01 CrcOk
1 00 FifoLevel
2 11 SyncAddress
3 00 FifoEmpty
4 11 PreambleDetect – Note: MapPreambleDetect bit should be set.