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'Decoder for 16 segment LEDs ?'
1999\08\17@073324 by Pavel Korensky

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Hello,

I need to build the multiplexed alphanumeric LED display with 10 digits. I
will use 16 segment LED with common anode. I would like to ask you, if you
have any idea if there is some simple 16 segment decoder chip available
(like 74LS247 for 7 segment) ?
If no, I will need to use bigger PIC :-(((

Best regards

PavelK

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1999\08\18@062442 by Caisson

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> Van: Pavel Korensky <spam_OUTpavelkTakeThisOuTspamDATOR3.ANET.CZ>
> Aan: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
> Onderwerp: Decoder for 16 segment LEDs ?
> Datum: dinsdag 17 augustus 1999 13:22
>
> Hello,
>
> I need to build the multiplexed alphanumeric LED display with 10 digits.
I
> will use 16 segment LED with common anode. I would like to ask you, if
you
> have any idea if there is some simple 16 segment decoder chip available
> (like 74LS247 for 7 segment) ?
> If no, I will need to use bigger PIC :-(((

Hello Pavel,  I suspect you will be multiplexing the 10 display's ...  You
could multiplex your segments as 2*8 too ...  with 1-to-2 decoders, or
simply by two bus-drivers ...

Greetz,
 Rudy Wieser

1999\08\18@173440 by Russell McMahon

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Pavel,

There are numerous LED driving ICs around. An oldie but a goodie is the
MM545X family which drives about 32 segments (40 pin dip) and has large
current drive capability, segment current control, doesn't need segment
resistors and has a very simple 2 wire serial interface which can be easily
driven from a PIC or whatever. For over 32 segments you can use more of
these :-) or could multiplex them under software control.This makes the PIC
a little busier but is still easy enough to do. Using one segment per
MM545X output the operation is fully static with no software overhead once
the data is output.

Russell McMahon


{Original Message removed}

1999\08\18@182932 by John Mitchell

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On Wed, 18 Aug 1999, Russell McMahon wrote:

> Pavel,
>
> There are numerous LED driving ICs around. An oldie but a goodie is the
> MM545X family which drives about 32 segments (40 pin dip) and has large
> current drive capability, segment current control, doesn't need segment
> resistors and has a very simple 2 wire serial interface [...]

here's a (little) more info:

The MM54X chips are from Micrel -- I found the MM5450 and MM5451.

My new best friend QuestLink.com has more information:
       http://www.questlink.com/Index/Listing/0,1121,0_0_183100,00.html


- j

1999\08\18@185253 by Armando Garcia Hernandez

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Hi,

I'm using the mm5450 of Micrel with a Pic16c84 and it works great!.

I'm displaying 3 1/2 digits for a clock counter (12:00-00:00) and other
second counter for seconds (30-00) , using 33 of the available pins and
the last one is for a sound in a speaker or something like that...

       if you want to use for 16 led segments, may be you must multiplex
it, using one mm5450 to drive 4 16-segments leds (using the first 32 bits
for 1-16 common entries (common anode)  and the last 2 bits to multiplex
the transistors that will be used in the anode. (4 transistors with a
combination 00,01,10,00, for activate each one)..

The clock time is about 0.5 Mhz, enough to multiplex several digits..
and using 1 MM5450 you just use 2 pins in the pic if you want other, just
use another pin for data and the clock as common.

I hope it helps..

Armando
Salamanca, Guanajuato
Mexico.

On Wed, 18 Aug 1999, John Mitchell wrote:

{Quote hidden}

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