Brad Robinson

How much current can Papilio Duo supply.

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Hey all,

Anyone know how much current I can safely draw from the 3.3 and 5V supplies on the Duo board.  

Looking to power 1x MAX7219 based 8x8 matrix module.  Says max current draw is 2A, but I'm only going to be lighting a few leds and can dial down the brightness.



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Hey Brad,

The 5V rail is connected directly to the USB connector so you should be able to draw as much as the USB socket can provide. If you are powering from a USB socket then it is limited to 500mA unless you are connecting through a powered hub. The Voltage regulator on the 3.3V rail can supply a maximum of 600mA if I remember correctly.


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