how to power CubieBoard

[Fermín García-Mina]

Hi,

¿Is it possible to power CubieBoard using VCC-5V present at the extension pins, or is it necessary to power via the jack only? Thanks in advance and best regards

[Bastiaan van den Berg]

On Thu, May 16, 2013 at 2:30 PM, Fermín García-Mina <fgarci...@grupov10.com> wrote:

Hi,

Is it possible to power CubieBoard using VCC-5V present at the extension pins?

Yes perfectly possible :)

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buZz 

[Fermín García-Mina]

Thanks Bastiaan. My doubt was because examining the schematics of CubieBoard there is a diode (D2) that makes the VCC-5V not flow towards DC-5V, and at the same time the AXP209 is fed from DC-5V, not from VCC-5V. Therefore examining the schematics it seems that VCC-5V is not the correct signal to generate all the rest of DC voltages: VDD-CPU, DLLVDD, etc.

[theRat]

I wouldn't power it through that pin.  There are a couple of reasons.

1. You are bypassing the fuse

2. The pins on the 2mm connectors are only rated for 1A.

There is an unpopulated 4pin header under the dc jack to allow for power input from another board.  It just a real bitch to remove the DC socket to be able to populate the header.

[Fermín García-Mina]

As a matter of fact it's not possible to power through those pins, finally I have had the chance to test on the board and it doesn't work. Obviously the schematics are OK and diode D2 makes VCC-5V an output not an input. Rating is OK cause there are two pins that sum up 2A, but it doesn't work anyway and bypassing the fuse is not a good idea as you say. Thanks.

[George Ioakimedes]

Wow, so much information that is not totally correct I just had to jump in. Yes, you can indeed power the Cubie through the 2mm headers, this is exactly what my Baseboard does. You must short or replace D2 with a 0 ohm resistor. You can find the details here powering-the-cubie-with-the-baseboard

The header under the DC jack has only 2 pins and there are 2 pins on the 2mm header for VCC_5V (U14-43, U15-1). Either the 4-pin header under the DC jack or the 2 pins on the 2mm header will supply the same amount of current. Yes, you may be able to mount a larger pin on the header under the DC jack but that is really splitting hairs as to what can handle more current.

The board has 2 USB ports so maximum power for those ports are 5...@0.5A x 2 so 1A. That leaves you 1A for the A10 processor and associated devices which is more than enough. If you're attaching anything to the GPIO pins that requires extra power those should be powered with an additional power source.

This is the main reason I designed the Baseboard. You bring power in on that board and it then supplies power for the Cubie and plenty of reserve for other devices you might want or need.

Yes, by applying power through the 2mm pins you are bypassing the fuse and protection diodes but if you're experimenting with headers on processor boards you should be skilled enough to always double check before you apply power. With my Baseboard you don't have to worry about bypassing the fuse or diodes because the board is wired to the correct pins.

[blades rompolos]

Can I power Cubieboard from GPIO header without baseboard and what pins should I use?
sorry but Iam noob on jardware

[George Ioakimedes]

Yes you can power the Cubie through the header pins but you need to short D2 to enable this. Please see this post that I made, http://www.iotllc.com/joomla/index.php/forum/baseboard/2-powering-the-cubie-with-the-baseboard

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[George Blades Voulgarakis]

"short" means make a connection? as I see it in the picture I guess

ευχαριστώ!

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Blades - www.snowguide.gr

[George Ioakimedes]

Yes, you can either replace D2 or just use a short wire across the 2 pads of D2 like in the picture. You can still use your Cubie as normal after doing this but you need to be careful to not switch positive and negative connections because D2 protects against that and shorting it removes that protection.

When used with my Baseboard it is easy to power the Cubie and other items all from 1 12VDC power supply because the Baseboard generates 5V for the Cubie.

Nice name!

[George Blades Voulgarakis]

ok, what "baseboard" is and in what ways can I use it?

[George Blades Voulgarakis]

one more question please!

1) ok I will short to D2, then in which pins of Cubie GPIO should I connect 5V and GND?

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Blades - www.snowguide.gr

[Luiz Fellipe Ferreira]

Here and Here , is one board that make easy connections to pins of GPIO.

Atenciosamente,

Luiz Fellipe Ferreira

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[George Blades Voulgarakis]

ok thank you

[George Ioakimedes]

Here's the link to the store with more details and pictures, https://store.iotllc.com/product.php?productid=3&cat=0&featured=Y