RFM66W Datasheet, PDF (21/87 Pages) List of Unclassifed Manufacturers – 868 & 915MHz Ultra Low Power High Link Budget Integrated UHF Transceiver

WIRELESS & SENSING
RFM66W
DATASHEET
The carrier frequency is programmed through RegFrf, split across addresses 0x06 to 0x08:
F_RF = F_STEP × Frf(23,0)
Note
The Frf setting is split across 3 bytes. A change in the center frequency will only be taken into account when the
least significant byte FrfLsb in RegFrfLsb is written. This allows for more complex modulation schemes such as m-
ary FSK, where frequency modulation is achieved by changing the programmed RF frequency.
3.3.4. RC Oscillator
All timings in the low-power state of the Top Level Sequencer rely on the accuracy of the internal low-power RC oscillator.
This oscillator is automatically calibrated at the device power-up, and it is a user-transparent process.
For applications enduring large temperature variations, and for which the power supply is never removed, RC calibration
can be performed upon user request. RcCalStart in RegOsc triggers this calibration, and the flag RcCalDone will be set
automatically when the calibration is over.
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