Gemma M0 - *five* pin USB connector??!!

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jharris1993
 
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Gemma M0 - *five* pin USB connector??!!

Post by jharris1993 »

Greetings!

Ref: Adafruit Gemma M0 schematic (Rev-D)

In the upper right hand corner of this schematic the micro-USB connector is shown as X2. Examining this connector, I see *five* pins called-out:
VBUS (+5 in from USB)
D+ (Data, positive phase for balanced pair)
D- (Data, negative phase for balanced pair)
GND (Power return)

Plus, a fifth pin called "ID" - which is not connected to anything.

=================================

OK, maybe I'm a back number, but I'm scratching my head. With the specific exception of USB-3.n, I have never seen anything except four pins in a USB connector.

I'm puzzled and I'd appreciate any enlightenment all you Evil Geniuses can provide (grin!)

Thanks!

Jim "JR"

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