Wrong Mini-USB-Jack

Andy Green andy at openmoko.com
Mon Apr 14 13:50:27 CEST 2008


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Somebody in the thread at some point said:
| Hi,
|
| In IRC we were wondering why the Freerunner, being a USB-OTG-Host
| (according to the OTG spec), only has a USB Mini-B interface (black
| jack). This means that only USB-Mini-B cables can be used in that
| jack, what causes that USB-OTG cables can't be used. The Freerunner
| is clearly a device that should have a Mini-AB port (grey jack),
| means it can be used as a client (over standard Mini-B plugs) or as a
| OTG-Host (over standard Mini-A plugs). It is only as small issue -
| the electric layout of both jacks is basically the same (means the
| Mini-B-jack can be replaced without changing layout or something else

You're right.

The apeture on the case is correct only for mini USB, so it isn't quite
painless.  The OTG socket has a different profile.

Micro AB:
http://www.farnell.com/datasheets/99722.pdf

Mini B:
http://www.farnell.com/datasheets/83318.pdf

The plastic case apeture conforms closely to the Mini B profile shape.

The thing does work OK as USB host, as you say the cables are going to
be an issue.

- -Andy
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