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Old Jan 13, 2011, 06:57 PM
KeithLuneau is offline
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define("BEASTMODE", "1");
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United States, LA, Moreauville
Joined Jan 2002
4,394 Posts
Hmm... Good point, I didn't even realize that!

I just double checked with the actual contacts in the connector, and pin 5 is ground, pin 4 is positive. Normal pinouts for mini-usb show pin 4 as "not connected"... Maybe they're using an otherwise "extra" pin for charging?

Also, the outer metal part is not connected to ground. Not sure if they usually are on mini-usb, but I would have thought so.

Searching, I found some more...

galapogos <> wrote:

> I'm wondering what the pinout of the mini USB connector is?

There's more than just one mini USB connector.

> I googled for this and found the following 2 standards:
> Pin 1 - VBUS
> Pin 2 - D-
> Pin 3 - D+
> Pin 4 - unconnected
> Pin 5 - GND

> Pin 1 - VBUS
> Pin 2 - D-
> Pin 3 - D+
> Pin 4 - connected to pin 5
> Pin 5 - GND

> So is Pin 4 unconnected or grounded?

You see both approaches.

> I tried probing the mini-USB connector of a 2.5" HDD enclosure that I have with
> a multimeter and pin 4 is apparently grounded as well. Does it even matter?

Nope, doesnt matter if you ground an unconnected pin.

> Also, is the shell also grounded directly

Usually not, but it sometimes is.

> or does it have any capacitors?

So, if some cables have pin 4 grounded, wouldn't that be bad for out little cameras? Good reason to watch what cable you use on it, and possibly why some camera are getting hot when used in webcam mode for a while?

Edit - On second thought, I'm now wondering if the red wire did in fact come off of that pin... I assumed it did because there was a little solder left on it, but it also looked like the wired had been hand soldered. Maybe it didn't come off of pin 4 afterall... Anyone care to check the output on their charger and verify it for me? If I've given some bad info I'll edit the post to reflect that...
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Last edited by KeithLuneau; Jan 13, 2011 at 07:55 PM.