RFM66W Datasheet, PDF (39/87 Pages) List of Unclassifed Manufacturers – 868 & 915MHz Ultra Low Power High Link Budget Integrated UHF Transceiver

WIRELESS & SENSING
RFM66W
DATASHEET
4.2.1. Transmitter Startup Time
The transmitter startup time, TS_TR, is calculated as follows, in when FSK modulation is selected:
TS _ TR = 5μs +1.25× PaRamp + ¹ × Tbit
2
,
where PaRamp is the ramp-up time programmed in RegPaRamp and Tbit is the bit time.
In OOK mode, this equation can be simplified to the following:
TS _ TR = 5μs +¹ × Tbit
2
4.2.2. Tx Start Procedure
As described in the former section, ModeReady and TxReady interrupts warn the uC that the transmitter is ready to
transmit data
 In Continuous mode, the preamble bits preceding the payload can be applied on the DIO2/DATA pin immediately after
any of these interrupts have fired. The DCLK signal, activated on pin DIO1/DCLK can also be used to start toggling the
DATA pin, as described on Figure 29.
 In Packet mode, the SX1231 will automatically modulate the RF signal with preamble bytes as soon as TxReady or
ModeReady happen. The actual packet transmission (starting with the number of preambles specified in PreambleSize)
will start when the TxStartCondition is fulfilled.
4.2.3. Receiver Startup Time
The receiver startup time TS_RE, only depends on the receiver bandwidth effective at the time of startup. When AFC is
enabled (AfcAutoOn=1), AfcBw should be used instead of RxBw to extract the receiver startup time:
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