i need the datasheet o this ic find in attachment
thanx
The picture attached is one of them HD44780U What is second? His name and what his role
plz helpppp
Wow! A real HD44780 chip - they haven't been seen for years!
Did you by any chance try Google? 
Warning! If that module has a backlight - but I can't see any soldered connections to suggest it does - it does not have a backlight resistor so if it has an LED backlight it will need a 100 Ohm series resistor.
OTOH, modules of that antiquity originally had electroluminescent panel (ELP) backlights.
It is a slave chip. It allows you to display more characters. Other than that, you do not need to worry about it.
You seem to be finding some seriously odd stuff! From where are you getting them? 
You seem to be finding some seriously odd stuff!
Me too! This prompted me to look through my collection of displays and I found one with a HD44780A00.
Mustafaab, I think that if you can find a data sheet for any LCD alphanumeric display with a parallel connection it will prpbably be correct for that display. I think they all use the same Hitachi chip, or something equivalent. Appologies if this turns out to be wrong.
If you use the LiquidCrystal library to control that first display, the one with the real HD44780, you should be aware that although it has one row of 16 characters it behaves quite differently.
You have to specify it as an 8x2 to the library.
You set the cursor to (0,0) to start displaying the first 8 characters on the left side and reposition the cursor to (0,1) to continue displaying the remaining characters on the right side of the screen.
If it also had an auxiliary chip (HD44100) then it would behave normally.
Don
Me too! This prompted me to look through my collection of displays and I found one with a HD44780A00.
By the way the A00 at the end of the part number specifies the ROM code within that particular chip. This is the 'normal' one so everything should appear as expected.
Don
OTOH, modules of that antiquity originally had electroluminescent panel (ELP) backlights.
I could be wrong but I think the modules with the electroluminescent backlights had only 14 pins. At least thats the way mine are set up. You have to connect the high voltage driver to the pins at the end and those pins are not labeled A and K.
I have some of the drivers around here somewhere but they haven't surfaced in the past few decades.
Don
floresta:
I could be wrong but I think the modules with the electroluminescent backlights had only 14 pins. At least thats the way mine are set up. You have to connect the high voltage driver to the pins at the end and those pins are not labelled A and K.
And you would of course, be right.
A couple of weeks back people were complaining of a burning smell in the rumpus room. I couldn't locate it. A week ago I happened to look at where I had a darling little Cupid's Arrow EL (glass tube) display in an acrylic case. I noticed the heatshrink cover on the inverter module was burnt and then that the glass tubing in the decoration had fractured in a couple of places. Not sure which happened first, but it had been left plugged in to a variable supply which I had used to test something and likely left set to maximum - 30 V.
Mind you, I think the display had long since failed - or been dropped as it was hanging on the edge of a shelf, or I would have noted it while I was testing and taken appropriate action to shut it off. So I actually rubbished it.