On 23/03/2011 13:35, PICdude wrote:
> Hi all,
>
> Tinkering with a 40x4 LCD.  Haven't found a full datasheet yet, but
> this is the physical data...
> http://www.winstar.com.tw/products_detail_ov.php?lang=3Den&ProID=3D41
>
> With the two enable pins and the repeated addressing of the character
> positions, I suspect it's just laid out two 40x2 LCDs in one.  And I'm
> fairly sure I've heard this before somewhere.
>
> However, I have doubts on the pinout.  The pins are labeled in reverse
> order (compared to the 16x2, 20x2), but comparing pin positions,
> almost all lines (DB0-7, R/W, Rs, Vo) are in the same position, but
> the Vdd&  Gnd lines are reversed.  Is this correct?  Or could it be a
> datasheet error?  I want to be sure before I fry this thing.
>
> Cheers,
> -Neil.
>
>
I have otherwise very similar LCDs with reversed pins.

Look at where the VSS goes. it should be clear. One of mine had vss go=20
to bezel and another to 0V pin of ICL7660 on board for VEE generator.
So I was sure.
--=20
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