RFM12B vs RFM12BP

[tim10243]

Hi,
could someone here with more knowledge than me do me a favour and
compare the connections of the transceivermodule RFM12B with the
connections of the RFM12BP?
Datasheets can be found here:
www.hoperf.com/pdf/RFM12B.pdf
and here:
www.hoperf.com/pdf/RFM12BP.PDF
What I want to know is: When I use a RFM12BP instead of a RFM12B is
all I have to do to use the same named pins of the RFM12BP and forget
about the rest of the connections? The RFM12BP has 24 pins - the
RFM12B has just 14 pins. Or is it much mor work like changing the
software and so on?
thank you
Tim

[Mathe]

Hi Tim,

De RFM12BP requires two extra outputs from the microcontroller to
drive the RXEN and TXEN inputs of the radiomodule. You should also
alter the software to drive these outputs when neccessary.
The RFM12BP does require a bigger power source. Besides the 3,3V it
also needs 12V/250mA to power the power output section of the module.

Marc

[tim10243]

Hi Marc,
two questions:
To reach the much higher range of the RFM12BR is it enough if the
transmitter spot has a RFM12BP and the receiver has just a RFM12B? Or
is it nessesary that the receiver spot has also a RFM12BP?
Second question: You wrote, that the RFM12BP needs 12Volts. Somewhere
else I read that the outputpower of the RFM12BP can be adjusted with
the voltage used. So would it be possible to run the RFM12BP with
9Volts and get a lower range?
Tim

[Mathe]

Hi Tim,

When you set the power for a channel on the transmitter, the receiver
will send an acknowledge back to the transmitter so therefore you'll
need both tx and rx equipped with the BP version.
If you only want to use the triger function you can get away with just
a BP version in the tx.

Lowering the voltage probably works. I don't expect there to much DC
voltage settings involved in the power stage of the BP version as it
most likely is in class C or D operation.

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