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LCD 16 * 2 without driver help !!

 
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psypersky



Joined: 06 Jul 2008
Posts: 13

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LCD 16 * 2 without driver help !!
PostPosted: Wed Jul 15, 2009 12:26 pm     Reply with quote
Hi, my name is Ruben

I want to use an LCD 16*2 without driver(without circuitry), connected directly to my 16f877A
here is the LCD:
http://www.allelectronics.com/make-a-store/item/LCD-94/2.68-X-0.8-LCD-NO-CIRCUITRY/-/1.html

Does anyone knows how?? An Engineer told me that is possible.

Thanks
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Wed Jul 15, 2009 1:08 pm     Reply with quote
You would have to duplicate everything in this chip:
http://www.sparkfun.com/datasheets/LCD/HD44780.pdf

Just buy the normal parallel-interface LCD.
asmboy



Joined: 20 Nov 2007
Posts: 2128
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graphic or character mode?
PostPosted: Wed Jul 15, 2009 2:14 pm     Reply with quote
in the 16F family - the ONLY parts that offer a glimmer of hope for you
are to be found in the datasheet for
PIC16F913/914/916/917/946

best 'o luck
psypersky



Joined: 06 Jul 2008
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Cost
PostPosted: Wed Jul 15, 2009 2:14 pm     Reply with quote
PCM programmer wrote:
You would have to duplicate everything in this chip:
http://www.sparkfun.com/datasheets/LCD/HD44780.pdf

Just buy the normal parallel-interface LCD.


Thanks

I want to do this because an LCD without driver cost about 0.1$/0.2$ DLLS
and this circuit is for an extensive production.

Do you think it's extremely difficult?
PCM programmer



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PostPosted: Wed Jul 15, 2009 2:16 pm     Reply with quote
Quote:
the ONLY parts that offer a glimmer of hope for you
are to be found in the datasheet for
PIC16F913/914/916/917/946

Those are for segmented LCDs, not dot-matrix LCDs.
mkuang



Joined: 14 Dec 2007
Posts: 257

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Re: Cost
PostPosted: Wed Jul 15, 2009 2:21 pm     Reply with quote
psypersky wrote:


Do you think it's extremely difficult?

Not difficult, just impossible. There isn't a snowball's chance in hell you will be able to duplicate all the functionality in the driver chip PCM programmer linked to.
Ttelmah
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PostPosted: Wed Jul 15, 2009 2:54 pm     Reply with quote
I did it some time ago. However the board involved, had a huge amount of logic involved, so I had a FPGA. I generated a small addressable RAM area using this, and the required dot control/timings in the same chip. I think it worked out at about 300 gates....
Basically, unless you have something similar, you can't do this. It is worth considering, if you are in a similar position, with enough external logic to warrant the gate array, but otherwise it'll cost more to control the LCD, than the controller itself.
However, if you only need basic number displays, without dot matrix characters, then much cheaper, and gives a clearer display, to switch to a segmented display, and a PIC that drives these....

Best Wishes
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