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Xbee signal input voltage

Posted by Ludovico Antonio on March 23, 2010 at 9:54am

Hi folks,
we are two guys from italy working on a drone for our high school final project.
Right now we are working on the ardupilot telemetry, and we have a question:
In the original project the Adafruit adapter board is used to reduce the signal voltage from 5 volt to 3 volt, and the xbee power in could be connected to the Ardupilot`s 3.3v out, right?
Now, i do read in the Xbee modules datasheet:

Serial Interface Data Rate:
(software selectable) 3.3V CMOS Serial UART (5V tolerant UART)

Does this means that i can connect the xbee directly to the Ardupilot without damaging it? Ardupilot can provide to the xbee 3.3 volt power source, so no problems here, and the xbee module can tolerate the ardupilot`s serial out signal voltage, right?
cheers

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33, 55, adafruit, adapter, ardupilot, serial, voltage, xbee

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Replies

Ludovico Antonio March 23, 2010 at 12:56pm

I contacted digi and they told me that is better not to do that.
James Turner March 23, 2010 at 10:57am

The Xbee serial input pin is 5V tolerant. It's only the Vcc and I/O that has to be 3.3V.