Re-Build of Solar lipo charger
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Re-Build of Solar lipo charger

by volker_doelling on Mon Dec 03, 2012 1:47 pm

Hello !
I am thinking of building the solar charger on my own, thanks to the open source nature of Product ID 390, which is solar, usb, dc lipo charger.
I would like t buy the MCP 73871. There are different "versions" which you can buy?
My question is:

What does the "2CCi/ML" part in this product name do ? : MCP73871-2CCI/ML
According to the manufacturer MCP there are different names of the MCP chip. Which version do you use in you adafruit product ?
Thank you very much for you answers.
Best greetings from germany.
Volker Dölling
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Re: Re-Build of Solar lipo charger

by volker_doelling on Tue Dec 04, 2012 1:02 pm

Hi there,

are there any informations missing, i should provide ?
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Re: Re-Build of Solar lipo charger

by adafruit_support_bill on Tue Dec 04, 2012 1:38 pm

The identification markings are described in section 7 of the data sheet: http://www.adafruit.com/datasheets/MCP73871.pdf
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Re: Re-Build of Solar lipo charger

by blbeggs on Tue Dec 04, 2012 9:20 pm

The datasheet isn't very helpful. But the best I can determine is that the suffix on the part number is an arbitrary identification value and the chips all perform exactly the same.

Also, I am trying to re-build the same charger and I have downloaded the eagle files. When I opened the .brd file I noticed a 0 ohm resistor floating at the bottom that appears to disable the USB charging. Have you noticed this? If so what is going on there?
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Re: Re-Build of Solar lipo charger

by adafruit_support_bill on Tue Dec 04, 2012 9:56 pm

The datasheet isn't very helpful. But the best I can determine is that the suffix on the part number is an arbitrary identification value and the chips all perform exactly the same.

It is actually pretty specific. See page 35.
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Re: Re-Build of Solar lipo charger

by blbeggs on Fri Dec 07, 2012 4:43 pm

Oh yep page 35 is much more helpful than 29, thanks. Which model does adafruit use? Also, any insight on what is going on with the floating 0 ohm resistor in the .brd file for this board? Is it an error?

https://github.com/adafruit/USB-DC-Solar-Lithium-Ion-Polymer-charger
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Re: Re-Build of Solar lipo charger

by adafruit_support_bill on Fri Dec 07, 2012 6:41 pm

We use the 2CC version. Not sure why the 0-ohm D2 is not properly placed, but the connections are correct as can be seen on the schematic and the photo on the catalog page.
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