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Author Topic: Query regarding using USB -> Molex (modded for SheevaPlug)  (Read 1330 times)
rmwebs
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« on: November 16, 2010, 04:45:57 AM »

Hi all,

I've got my first SheevaPlug on its way from the new IT folks. I've read a lot about the power issues and *think* I may have a possible solution to test on my new plug.

Basically, from photos (http://computingplugs.com/index.php/Opening_the_box_and_first_boot) it looks like the Sheeva mainboard uses a floppy drive style power connector (officially called a Berg connector). If so, it should be possible to use a usb -> Molex cable and change the molex connecter out for a Berg connector.

Would you say that this is correct? If so, you can but USB -> Molex connectors, or make one (http://forums.bit-tech.net/showthread.php?t=89344). The only difference would be instead of using a standard molex plug, you use the Berg one, which has the same pin layout (http://en.wikipedia.org/wiki/Berg_connector).

The main difference would be the pin layout WOULD need to be modified to work on the Sheeva.

From this image (http://computingplugs.com/index.php/File:J3.jpg) you can see the layout that needs to be used.

I'll have to have a play around when I get mine, but if anyones tried this or found a flaw here please do post!

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mw
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« Reply #1 on: November 17, 2010, 03:27:22 AM »

The header on my board looks as if it is a JST XH series type. I haven't physically tested it against a real JST XH plug. (Yet).

If I'm right, RS Components part numbers are:

Header:  543-2733 (on the board).

Plug housing: 353-1636
Terminals: 353-1591

I had to slice a "floppy disk power connector" about to remove surplus plastic before being able to fit it in. It regularly fell out, though, because there was no locking mechanism.

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