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'Looking for 5-6 digit alpha numeric or 7 segment L'
1996\06\03@055344 by NEIL GANDLER

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I am looking for an LED alpha numeric display, 5-6 digit, that is relately
low in cost. Microprocessor interface is a must. What would be ideal
is a display set up for multiplexing (pins for each segment, with 5-6 pins,
for selecting the which digit to activate). This would allow an easy interface
to a microprocess. Another alternative could be a display interfaced with
a decoder/driver IC, but cost is a concern. I would like it to run less
than $10 or so. If an alphanumeric type is too expensive, a 7 segment
display would be fine as long as I can form my own psuedo letters by
activating selected segments, such as to make the letters b,f,E and -
I would appreciate any advice or leads. Digi-key , Jameco and JDR seem
to have limited selections. Thanks

               Neil Gandler

1996\06\04@003127 by Michael S. Hagberg

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> I am looking for an LED alpha numeric display, 5-6 digit, that is relately
>low in cost. Microprocessor interface is a must. What would be ideal
...snip...
>                Neil Gandler
>
>

Well the part you are looking for is a MAXIM 7219. That's the good news.
If you will NEED the part for production check on delivery. They always
seem to have the part for samples but cann't seem to find any when I placed
an order for only 100 pcs. When a $5000 order was sitting on the shipping
bench waiting for these parts they got an ear full, and came up with a few
parts for this order. I'm not the only one looking for parts, I hope MAXIM
realizes how popular this part is and gets production going before the
competition creates a simular part.

Michael

1996\06\06@163419 by Mark K Sullivan

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> I am looking for an LED alpha numeric display, 5-6 digit, that is relately
>low in cost. Microprocessor interface is a must. What would be ideal
>
>                Neil Gandler

I don't know about low cost (but you do buy from Jameco) but the display you are
describing is almost exactly the Siemens HDSP2000 series.  There are 4 and 8
digit versions, either of which may be daisy chained (with no additional I/O)
into longer strings.  The digits are a 5x7 dot matrix, you provide the character
generator.  You supply the row data via shift clock and serial data inputs and
you provide column drive for five columns.  Multiplexing is 1/5 with one column
(of all digits) at a time being active.  PIC drive requires 7 I/O (or less with
external shift register for col drive) and maybe 5 transistors.

Siemens is distributed by Marshall.  Check http://www.marshall.com

- Mark Sullivan -

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