RFM24W Datasheet, PDF (22/34 Pages) List of Unclassifed Manufacturers – ISM Transceiver module

RFM24W
4. Modulation and Hardware Configuration Options
The RFM24W supports different modulation options and can be used in various configurations to tailor the device
to any specific application or legacy system for drop in replacement. The modulation and configuration options are
set in API property, MODEM_MOD_TYPE.
Figure 10. Modulation and Hardware Configuration Options
4.1. Modulation Types
The RFM24W supports five different modulation options: Gaussian Frequency Shift Keying (GFSK), Frequency
Shift Keying (FSK), Four Level GFSK (4GFSK), Four Level FSK (4FSK), On-Off Keying (OOK), and Amplitude
Shift Keying (ASK). Minimum Shift Keying (MSK) can also be created by using GFSK settings. GFSK is the
recommended modulation type as it provides the best performance and cleanest modulation spectrum. The
modulation type is set by the “MOD_TYPE[2:0]” registers in the “MODEM_MOD_TYPE” API property. A
continuous-wave (CW) carrier may also be selected for RF evaluation purposes. The modulation source may also
be selected to be a pseudo-random source for evaluation purposes.
4.2. Hardware Configuration Options
There are three main methods to transfer RX/TX data from the host MCU to the RF device. There are various other
configurations options of these three main methods that will be described in the individual subsections.
FIFO Mode—Utilizes the internal 64byte TX and RX FIFO’s. Permits use of the internal packet handler.
Direct Mode—Data/Data CLK are programmed directly onto a GPIO but a 101010… preamble is used
RAW Direct Mode—Data is programmed directly onto a GPIO but a 101010.. preamble is NOT used.
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