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'[OT]:How to obtain spec for a LCD module?'
2003\02\17@013122 by Pang

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Hi all,

I have with me an LCD module and there's no way for me to determine it's
manufacturer and obtain the spec. What should I do? I have not really handle
any LCD module b4 as such any ideas will be greatly appreciated. The
physical attributes are ---  2 times 3.4 inch
-.  16 pinout on one side and 4 on the other side
-.  There is a Made in Hong Kong sign and three Hitachi chips at the back
HD44100FS x 2 and  HD44780A00.
-.  There is a VL sign printed on the PCB
-.  And finally ( but i cannot confirm ) the outside package has this number
MDL20265-LV-RC

Any ideas..?

Thanks and have a nice day.

Rgds,
pang

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2003\02\17@013922 by Neil Bradley

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> I have with me an LCD module and there's no way for me to determine it's
> manufacturer and obtain the spec. What should I do? I have not really handle
> any LCD module b4 as such any ideas will be greatly appreciated. The

Your answer is here:

> HD44100FS x 2 and  HD44780A00.

You might have trouble with the pinout, but at least you know it's a
44780. That's as common as a 74LS04.

If you're looking for the pinout, have a look at Hantronix's web site for
an equivalent device.  I'd bet money it's a standard configuration in
terms of pin organization.

-->Neil

-------------------------------------------------------------------------------
Neil Bradley            In the land of the blind, the one eyed man is not
Synthcom Systems, Inc.  king - he's a prisoner.
ICQ #29402898

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2003\02\17@104254 by M. Adam Davis

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When I had an undocumented 4x40 display (2 44780 chips) I got the pinout
for the 44780 chip and used an ohmeter to determine which wires
connected to which pins on the connectors.

The 44780 chip document is not easy to get, but a good search will find
it for you.  I think I actually used a later version of the 44780 chip's
document...

-Adam

Pang wrote:

{Quote hidden}

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2003\02\17@105836 by Wagner Lipnharski

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20265 is a Varitronix 2 x 20 unit.

1 44780 + 2 x 44100 means;

The 44780 can drive up to 2 x 8 LCD chars,
The first 44100 complements the 44780 in the first bank, so the display
goes up to 2 x 16 chars.
The second 44100 drievs the whole second set of 2 x 16 chars, so the
display can drive up to 2 x 32 chars

This model 20265 drives only 2 x 20 chars.
The connector pin 15 and 16 are used to drive power to the BackLight if
existent.
Check more information about LCD at: http://www.ustr.net
or this specific datasheet at
http://www.varitronix.com/catalog/lcm_spec/MDL(S)-20265.pdf

Cheers,
Wagner.

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2003\02\17@112653 by michael brown

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From: "Pang" <spam_OUTklpangTakeThisOuTspamAICM.COM.MY>

> Hi all,
>
> I have with me an LCD module and there's no way for me to determine
it's
> manufacturer and obtain the spec. What should I do? I have not really
handle
> any LCD module b4 as such any ideas will be greatly appreciated. The
> physical attributes are ---  2 times 3.4 inch
> -.  16 pinout on one side and 4 on the other side
> -.  There is a Made in Hong Kong sign and three Hitachi chips at the
back
> HD44100FS x 2 and  HD44780A00.
> -.  There is a VL sign printed on the PCB
> -.  And finally ( but i cannot confirm ) the outside package has this
number
> MDL20265-LV-RC

Sounds like a typical Hitachi 44780 based LCD.  They are commonly found
with 14 or 16 pin connectors and typically follow a somewhat "standard"
layout.  You should be able to find much information on these by
searching for 44780 on Google.  Pins 1-3 are (not in this order) Vcc,
Vdd, and Contrast.  Try hooking Contrast and Vdd to ground and Vcc to
+5V.  You should see the display initialize with rows of black blocks.
If so, you are well on your way to getting it to work.  If you don't see
anything, try a slightly negative voltage on the Contrast pin (-1 to -2V
should do it).

Surprisingly these seem to be fairly durable.  I recently made up a new
breadboard and accidentally got the Vcc and Vdd backwards.  While
examining the circuit to determine why the blocks didn't show up, my
calibrated face detected a fair amount of heat coming from the display.
I quickly unhooked it and felt the back of the display, it was quite
hot.  :-O  After correcting the wiring, it worked perfectly much to my
amazement.  ;-)  YMMV

I would still recommend using a current limiting resistor in the power
supply before experimenting.  IIRC, the display should require less than
5mA, but check the data sheet for a similar display.

http://www.optrex.com should be a good place to start looking for info.

Good luck

michael

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