mini USB pinout

  • Thread starter Thread starter galapogos
  • Start date Start date
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galapogos

Hi,

I'm wondering what the pinout of the mini USB connector is? 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? 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? Also, is the
shell also grounded directly or does it have any capacitors?

Thanks!
 
galapogos said:
I'm wondering what the pinout of the mini USB connector is?
Click to expand...

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
Click to expand...
Pin 1 - VBUS
Pin 2 - D-
Pin 3 - D+
Pin 4 - connected to pin 5
Pin 5 - GND
Click to expand...
So is Pin 4 unconnected or grounded?
Click to expand...

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?
Click to expand...

Nope, doesnt matter if you ground an unconnected pin.
Also, is the shell also grounded directly
Click to expand...

Usually not, but it sometimes is.
or does it have any capacitors?
Click to expand...

Varys.
 
galapogos said:
Hi,

I'm wondering what the pinout of the mini USB connector is? 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? 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? Also, is the
shell also grounded directly or does it have any capacitors?

Thanks!
Click to expand...

http://www.zytrax.com/tech/pc/serial.html

This article says the extra pin serves as an ID function.
Part of USB OTG and defining initial roles for the two
devices at the ends of the USB cable.

http://www.maxim-ic.com/appnotes.cfm?appnote_number=1822&CMP=WP-3

( Link found on http://en.wikipedia.org/wiki/USB_OTG )

Paul
 
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