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20 year old 7 segment 9 digit led display- PLEASE HELP TO FIGURE OUT PART NUMBER AND DATASHEET? Answered

URGENT HELP APPRECIATED
I have a 20 year old 7 segment 9 digit led display, i cannot figure out the part no.
Here's is what is written in the back of it- (NSA 520 DCCB VO 0179-A)
it has 9 digits, a segment below every digit, 7 segment per digit, 18 pin holes

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steveastrouk (author)2013-06-05

That looks like a matrix connected display. Make a test lead with a 5V PSU and a 150 Ohm series resistor, connect the ground of the supply to another lead, and start poking.

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polkijain (author)steveastrouk2013-06-16

which hole is the ground ?

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steveastrouk (author)polkijain2013-06-16

You can work it out from your tests.

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Josehf Murchison (author)2013-06-05

Better picks would help.

Look around there should be a part number somewhere on the side top or bottom it may even be between the display and the circuit board.

Then these two sights are good for free datasheets.

http://www.maxim4u.com/

http://www.alldatasheet.com/

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user

Here's is what is written in the back of it- NSA 520 DCCB VO 0179-A

is that the part number ?

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anindo (author)2013-06-05

Try the following pin-outs (from an old 9-digit LED calculator display). Note that pin 1 is NC, and the "H" segments are the bars under the digits, in place of decimal points on more typical 7-segment displays.

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The Skinnerz (author)2013-06-05

Looking at http://www.decadecounter.com/vta/articleview?item=467, what you have is likely a similar version- try searching with just NSA-520, that may throw up some results.

If you can't find a datasheet, have a look at some of the other early LED displays on that site and see what sort of currents and voltages are required. It looks as though you have a cathode for each of the 9 digits, and an anode for each of the 7 segments, the d.p. and the bar under the digit. Alternatively, the anodes and cathodes may be swapped.

Without a datasheet, you will likely need at apply a voltage to pairs of pins and see what happens and work out the pinout from that, or see if you can follow any of the tracks on the back of the display.

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polkijain (author)The Skinnerz2013-06-05