RFM70 Datasheet, PDF (3/26 Pages) –

1 General Description
RFM70 is a GFSK transceiver module
operating in the world wide ISM frequency
band at 2400 - 2483.5 MHz. Burst mode
transmission and up to 2Mbps air data rate
make them suitable for applications requiring
ultra low power consumption.The embedded
packet processing engines enable their full
operation with a very simple MCU as a radio
system.Auto re-transmission and auto
acknowledge give reliable link without any
MCU interference.
RFM70 operates in TDD mode, either as a
transmitter or as a receiver.
The RF channel frequency determines the
center of the channel used by RFM70. The
frequency is set by the RF_CH register in
register bank 0 according to the following
formula: F0= 2400 + RF_CH (MHz). The
RFM70 V1.0
resolution of the RF channel frequency is
1MHz.
A transmitter and a receiver must be
programmed with the same RF channel
frequency to be able to communicate with
each other.
The output power of RFM70 is set by the
RF_PWR bits in the RF_SETUP register.
Demodulation is done with embedded data
slicer and bit recovery logic. The air data rate
can be programmed to 1Mbps or 2Mbps by
RF_DR register. A transmitter and a receiver
must be programmed with the same setting.
In the following chapters, all registers are in
register bank 0 except with explicit claim.
Figure 1 RFM70 Chip Block Diagram
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