RFM92 Datasheet, PDF (50/126 Pages) List of Unclassifed Manufacturers – Low Power Long Range Transceiver Module

RFM92W/93W V3.0
The calibration process takes approximately 10 ms.
4.2.3.9. Timeout Function
The RFM92W/93W includes a Timeout function, which allows the automation of a duty-cycled recceive oprtation where
the radio periodically wakes from sleep mode into receiver mode.
Š Timeout interrupt is generated TimeoutRxRssi x 16 x Tbit after switching to Rx mode if the Rssi flag does not raise
within this time frame (RssiValue > RssiThreshold).
Š Timeout interrupt is generated TimeoutRxPreamble x 16 x Tbit after switching to Rx mode if the PreambleDetect flag
does not raise within this time frame.
Š Timeout interrupt is generated TimeoutSignalSync x 16 x Tbit after switching to Rx mode if the SyncAddress flag does
not raise within this time frame.
This timeout interrupt can be used to warn the companion processor to shut down the receiver and return to a lower power
mode. To become active, these timeouts must also be enabled by setting the correct RxTrigger parameters in
RegRxConfig:
Table 20 RxTrigger Settings to Enable Timeout Interrupts
Receiver
Triggering Event
None
Rssi Interrupt
PreambleDetect
Rssi Interrupt & PreambleDetect
RxTrigger
(2:0)
000
001
110
111
Timeout on
Rssi
Off
Active
Off
Active
Timeout on
Preamble
Off
Off
Active
Active
Timeout on
SyncAddress
Active
4.2.4. Operating Modes in FSK/OOK Mode
4.2.5. General Overview
The RFM92W/93W has several working modes, manually programmed in RegOpMode. Fully automated mode
selection, packet transmission and reception is also possible using the Top Level Sequencer described in Section 4.2.9.
Table 21 Basic Transceiver Modes
Mode
000
001
010
011
100
101
Selected mode
Sleep mode
Standby mode
Frequency synthesiser to Tx
frequency
Transmit mode
Frequency synthesiser to Rx
frequency
Receive mode
Symbol
Sleep
Stdby
FSTx
Enabled blocks
None
Top regulator and crystal oscillator
Frequency synthesizer at Tx frequency (Frf)
Tx
FSRx
Frequency synthesizer and transmitter
Frequency synthesizer at frequency for reception (Frf-IF)
Rx
Frequency synthesizer and receiver
When switching from a mode to another the sub-blocks are woken up according to a pre-defined optimized sequence.
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