Power Due completely from 3.3v pin

Can I power the due completely via the 3.3v power pin? I have it sitting on a board where a http://www.adafruit.com/datasheets/tsr1.pdf is providing 3.3v power, but I am unable to get it to output it's CAN and I'm not sure it's doing it's i2c duties either.

Thanks!

If the answer is no, I have a 12v incoming supply to the TSR-1 buck converter, could I just run a wire from it to the due's VIN pin? Is there consequences to running a Due 24/7/365 in this fashion?

(I noticed from this http://forum.arduino.cc/index.php?topic=132130.0) that it "depends on current drawn" My bench power shows I'm drawing 0.07amps right now running almost everything.

Would the Due conflict with the regulated supply if I did this? seems I should disconnect the 3.3v pin if I were to power the Due this way.

Thank you!!

You shouldn’t inject 3v3 into the board through the headers, it will reverse bias the regulator which normally is not a good idea. I don’t know exactly what the NCP1117 regulator will think about that but best not to find out I suspect.

I have a 12v incoming supply to the TSR-1 buck converter, could I just run a wire from it to the due’s VIN pin? Is there consequences to running a Due 24/7/365 in this fashion?

I don’t think so, at that power level (70mA) you won’t have any heat issues with dropping from 12v.

seems I should disconnect the 3.3v pin if I were to power the Due this way.

You certainly should not have the TSR supplying 3v3 to the header and also have VIN connected.

What is the TSR’s purpose? If it’s just to get 3v3 for the Arduino you don’t need it. If you are aiming to allow 36v on VIN, you should get the 9V version of the TSR and feed VIN from that.


Rob

I have a lot of other 3.3v components and wanted really really clean power. For this version It sounds like I should just run 12v to VIN and then disconnect the other power lines. I have to run out real quick but wanted to thank you so much for your fast response!!