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'SSP-compatible displays?'
1996\05\26@001908 by John & Maria Perry

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I'm most of the way through an embedded system design here, and the customer
suddenly has hit me with a need for a small display.

To avoid the software-intensive IIC, I'm using the 93LC series EEPROMs for
stable data storage.  If I can come up with a SPI- or Microwire-compatible
display, I don't have to change my processor board much.  Does anyone know
of such a beast? I've looked in EEM and ECN, and see lots of parallel and
RS-232 type LCD's, but nothing that looks like a 3- or 4-wire serial design.

Can anyone point me in the right direction?


john perry
spam_OUTjperryTakeThisOuTspamnorfolk.infi.net

1996\05\27@073142 by Jim Main

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>display, I don't have to change my processor board much.  Does anyone know
>of such a beast? I've looked in EEM and ECN, and see lots of parallel and
>RS-232 type LCD's, but nothing that looks like a 3- or 4-wire serial design.

Does it have to be an LCD?  Siemens and Hewlett Packard do intelligent dot
matrix displays which look quite nice, and the larger ones have serial input
- don't know whether it's spi compatible though - you'd have to look up the
datasheets.

Siemens do a 10 digit alphanumeric dot matrix led (char height 3.7mm) -
SCD55100

Jim

1996\05\28@041729 by Wolfram Liebchen

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John & Maria Perry wrote:
>
> I'm most of the way through an embedded system design here, and the customer
> suddenly has hit me with a need for a small display.
>
> To avoid the software-intensive IIC, I'm using the 93LC series EEPROMs for
> stable data storage.  If I can come up with a SPI- or Microwire-compatible
> display, I don't have to change my processor board much.  Does anyone know
> of such a beast? I've looked in EEM and ECN, and see lots of parallel and
> RS-232 type LCD's, but nothing that looks like a 3- or 4-wire serial design.
>
> Can anyone point me in the right direction?
>
> john perry
> .....jperryKILLspamspam@spam@norfolk.infi.net


John,

if it is sufficient to have an 8 digits LED display, then you could
use the MAXIM 7219 chip. It has a SPI compatible interface and all
drivers for the LED built in.

Wolfram

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1996\05\28@085316 by Mark K Sullivan

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Check availability before designing in MAX7219.  It's a great part but there is
no second source.  We have had production held up more than once because of long
leads on the 7219.

- Mark Sullivan -

1996\05\28@115640 by Adriano De Minicis

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> of such a beast? I've looked in EEM and ECN, and see lots of parallel
> and RS-232 type LCD's, but nothing that looks like a 3- or 4-wire serial
> design.

Why don't just use a parallel display in 4-bit mode, together with a
shift-register for serial to parallel conversion?

You can find some tips on the LCD FAQ on the "circuit cookbook" sites.
(ftp.ee.ualberta.ca/pub/cookbook/faq/lcd.doc).

Adriano

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