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Topic: Power requirement for Xbee pro (Read 35 times) previous topic - next topic

d20237

Hi all,

I have checked the data sheet for Xbee pro
http://www.digi.com/pdf/ds_xbeepro900hp.pdf

and in the specifications table, The power requirement for transmitting signal is 230 mA,
while Arduino pin can only output 40 mA , I am a bit confused on what shall be done next ? (a separate circuit and NPN transistor ? ) or i got it wrong ?


PaulS

Quote
or i got it wrong ?
The power does not (or should not) come from a digital pin. It should come from the 3.3V regulator via the 3.3V pin, or from a separate power supply.

d20237

The power does not (or should not) come from a digital pin. It should come from the 3.3V regulator via the 3.3V pin, or from a separate power supply.
DC Current for 3.3V Pin   is 50 mA
while xbee needs 250 mA

CrossRoads

On an Uno, 3.3V pin can supply 150mA from the 3.3V regulator.
50mA is left over from when 3.3V came from the FT232 chip.

Separate source is needed for the Xbee as it needs higher current during transmitting as noted.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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