View Full Version : Vcc vss vdd

08-08-2005, 08:08 AM
Very stupid beginner question. VSS is ground? Vdd is +5v? Vcc is also +5V? i am confused. why is Vdd and Vcc the same thing

Chris Savage
08-08-2005, 08:19 AM

It's probably going to be easier for you to just remember that Vcc and Vdd refer to the positive side of the power supply. Not necessarily +5V. Vss is ground. Sometimes Vee will be used in systems with a negative power supply. Vin is for Voltage IN...There are many other such designations, but you can easily Google for sites that get into not only what many of these mean, but the basics of electronics.

Chris Savage
Parallax Tech Support
csavage@parallax.com (mailto:csavage@parallax.com)

08-08-2005, 08:21 AM
if one ic has a vcc and a vss. and another ic in the same circuit has a vdd and a vss, can the vcc and vdd be tied together?

Jon Williams
08-08-2005, 08:30 AM

Jon Williams
Applications Engineer, Parallax

Brian Carpenter
08-08-2005, 08:35 AM

Steve Joblin
08-08-2005, 08:58 PM
I hope your question was answered...

With specific regards to the Stamp...

Vss = ground

Vdd = +5volt regulated power

Vin = unregulated power directly from your batteries