RFM68CW Datasheet, PDF (9/20 Pages) List of Unclassifed Manufacturers – Low Cost ISM Transmitter Module

RFM68CW
4.2. Mode Selection Flowchart
Circuit Start-up
Wait T_Start
RFM68CW
Logic ‘0’
Check
CTRL Pin
Logic ‘1’
Power & Go 1
868.3 MHz
FSK, Fdev=+/-19.2kHz
+10dBm
Power & Go 2
433.92 MHz
OOK
+10dBm
CTRL Clock signal
Advanced Mode Full
register flexibility Automatic
or forced Transmit
Figure 4. RFM68CW Mode
Selection
Note Advanced mode is entered only if DATA is held low during CTRL’s rising edge.
When powering up the circuit (microcontroller and RFM68CW), the logic level of the CTRL pin is sampled after T_START,
as described on Figure 5. During T_START, the microcontroller IO driving the CTRL pin must be configured as an output,
driving the CTRL pin to the desired state.
Figure 5. Power-up
Timing
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