Battery operation

[urashid]

I am looking to build a self-contained portable device using the pico
board. What will be the power requirements for the board with wifi
enabled (using the mini PCI-e card)? I am looking to use a 2000mAH Li-
Po battery similar to this one:

http://www.sparkfun.com/products/8483

Also, is there any charge circuitry on-board so that the mini-USB port
can be used charging the battery?

Thanks in advance,
Usman

[Carmine Noviello]

Hi,

I'm working on a similar solution. I'm designing a simple li-on battery charger to integrate with pico-board using J21 connector. It's based on the Microchip 73831 battery charger IC, and it's suitable for USB powered devices.

I'll submit schematics and layout as soon I complete them.

Hope it helps,

Carmine

--
Sito: http://www.carminenoviello.com
http://gallery.carminenoviello.com

[urashid]

Thanks Carmine, I guess this means there is no on-board charge
management chip. How about using this board from sparkfun:

http://www.sparkfun.com/products/10161

it is also based on 73831.

Usman

On Mar 19, 8:23 am, Carmine Noviello <carmine.novie...@gmail.com>
wrote:

> Hi,
> I'm working on a similar solution. I'm designing a simple li-on battery
> charger to integrate with pico-board using J21 connector. It's based on the
> Microchip 73831 battery charger IC, and it's suitable for USB powered
> devices.
> I'll submit schematics and layout as soon I complete them.
>
> Hope it helps,
> Carmine
>

[Carmine Noviello]

Yes, it's a an alternative even if I don't like how SYS OUT was designed, because current is drained directly from charger IC and it's not the best solution to power the board and charge the battery in the same time.

My design separates main power from battery power using a simple mosfet.

Carmine 

[Daniel Palmer]

Not sure about the power requirements .. I could hook up an ammeter.. but I'm building kernels right now :) Maybe later.

For the charging circuit.. how about this http://www.seeedstudio.com/depot/lipo-rider-pro-p-992.html?cPath=155 

Seeedstudio's stuff is usually pretty good.

I did run the pico off of a cheap 2000mAh rechargable USB battery from dealextreme for a while. I never ran it dry, but it lasted a few hours at least.

[Nikolay Gnatenko]

Hello everyone,

Any news on the development? Just curious where you guys stand...

Thank you,

Nikolay