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PICList Thread
'Simple(!) LCD Driver'
1998\02\12@051449 by Louis Pretorius

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Hi all,

I have mailed before but didn't get much response.

I am looking for a VERY simple way to drive a 4 or 5 character 7-segment
LCD from a PIC, using as few lines as possible.  I am sure that
somewhere I actually saw a LCD driver chip with a serial interface, but
I can't seem to find it again.  I also need to interface a keypad and
two A/D's.

Any pointers will be appreciated.

Louis

1998\02\12@055844 by Philippe

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At 12:06 12/02/98 +0200, you wrote:
>I am looking for a VERY simple way to drive a 4 or 5 character 7-segment
>LCD from a PIC, using as few lines as possible.  I am sure that
>somewhere I actually saw a LCD driver chip with a serial interface, but
>I can't seem to find it again.  I also need to interface a keypad and
>two A/D's.

Look at:
          http://www.wirz.com

for serial interfaced LCD panel

Regards,
       Philippe.

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1998\02\12@060740 by Bill Rininger

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Were can I find suck\h a small LCD?


-----Original Message-----
From: Philippe <.....p.techerKILLspamspam@spam@IZARBEL.TM.FR>
To: PICLISTspamKILLspamMITVMA.MIT.EDU <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Date: Thursday, February 12, 1998 5:58 AM
Subject: Re: Simple(!) LCD Driver


{Quote hidden}

1998\02\12@083434 by Louis Pretorius

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Thanks for the info, I had actually seen that before, but I am looking
for a driver chip that I can interface with a simple large 4 or 5
character 7-segment display.  It is such a simple thing, there must be
thousands of people who have done this before.  Why can't I find any
examples?

> {Original Message removed}

1998\02\12@170602 by rlunn

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Bill Rininger wrote:

> Were can I find such a small LCD?

       http://www.varitronix.com

___Bob

1998\02\12@170604 by rlunn

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Louis Pretorius wrote:

> I am looking for a VERY simple way to drive a 4 or
> 5 character 7-segment LCD from a PIC, using as few
> lines as possible.

       Louis,

       The MM5452 and MM5453 from National Semiconductor
       (and Motorola) will drive 32 and 33 segments
       respectively and 1 backplane.  They have a simple
       2-wire interface (clocked serial data).

       The PCF8577C from Philips will drive 32 segments
       and 2 backplanes.  It also has a 2-wire interface
       (but IIC, so other devices such as A/D converters
       can be added to the same 2-wire bus).

       The uPD7225G from NEC will drive 32 segments and
       4 backplanes.  It has a 4-wire interface.

       Datasheets for all these chips are available from
       the respective manufacturers web sites.

___Bob

1998\02\13@015756 by Louis Pretorius

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{Quote hidden}

       [Louis Pretorius]

       Thank you Bob, this is exactly what I was looking for!

       Is there anyone that has come across any source code for driving
either of these chips?

       Louis

1998\02\14@044458 by Russell McMahon

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I have code (which I have written for a ST6 microprocessor)
for driving the MM545X series interface chips. There are
versions for LCD and LED segment drives.
545X. The ST6 code is very simple and fairly well
documented. If you can't get PIC code from anyone I could
give you a copy of mine. The chips are VERY easy to drive
(much easier than eg I squared C). The only traps lie in
ensuring you have clocked out just the right number of bits
to make a frame - slightly trickier than it may seem under
certain circumstances.


{Original Message removed}

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