Register to reply

7 seg display NO CHIP pin?

by phlegmy
Tags: chip, display
Share this thread:
phlegmy
#1
Mar6-11, 09:09 AM
P: 119
hello wise ones.
I've recently taken delivery of some 7 segment led displays
for a small project, (i'm brand new at building electronic ccts)
3 of theese single digit displays will be driven from a microcontroller

the 7 segment display units have a pin labelled "no chip"
from googling all i can figure out is that it likely to be a "no chip select pin"

i will experiment of course to figure this out but forewarned is fore armed!

can i use the "no chip" pin to strobe the displays?
i had planned on using some small transistors to
connect the common cathode of each digit, to ground ,in turn.
this would achive the strobing, but is there some way to make use of this
"no chip pin"?

Any insights appreciated
Phys.Org News Partner Engineering news on Phys.org
Greater safety and security at Europe's train stations
Fingerprints for freight items
On the way to a safe and secure smart home
vk6kro
#2
Mar6-11, 10:55 AM
Sci Advisor
P: 4,032
"NO CHIP" doesn't really make sense. Could it be a NC pin, meaning "NO CONNECTION" ?

Have a look at this page:
http://www.google.com/images?hl=en&s...egment+display

which gives a lot of pinouts for 7 segment displays and how to connect them.

None of them seem to have a NC pin, but it is very common to have a pin like this on an integrated circuit. It just means you should not use this pin for anything as it may have an internal connection that is not part of the output of the chip, or it may just go nowhere.
phlegmy
#3
Jun6-11, 04:48 PM
P: 119
I know its been a while, but for the sake of anyone else who gets here, the "no chip" pin seems to have been a dummy, i simply clipped it off before soldering the displays to my circuit.

Jiggy-Ninja
#4
Jun6-11, 08:28 PM
P: 310
7 seg display NO CHIP pin?

Quote Quote by vk6kro View Post
"NO CHIP" doesn't really make sense. Could it be a NC pin, meaning "NO CONNECTION" ?

Have a look at this page:
http://www.google.com/images?hl=en&s...egment+display

which gives a lot of pinouts for 7 segment displays and how to connect them.

None of them seem to have a NC pin, but it is very common to have a pin like this on an integrated circuit. It just means you should not use this pin for anything as it may have an internal connection that is not part of the output of the chip, or it may just go nowhere.
I think MAN72 displays (or something like that) that have 14 pins have a few NC pins. The ones I got from school have a gap where the NC pin would be.


Register to reply

Related Discussions
BIOS chip and CMOS chip Computers 4
What is a chip ? General Physics 1
IC Chip Orientation Electrical Engineering 5
Develop a program to display a number, on a single 7 segment LED display Computing & Technology 6
Display a number, on a single 7 segment LED display Introductory Physics Homework 0