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logic levels of LCD-Uc interfacing

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nscpl

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Hi,
I am interfacing UC with LCD44780.
I am driving LCD44780 on 5V
can my signal voltage(data lines) be 3.3V?
Can I drive LCD44780 in 3.3V?
What is Z+ and Z- in LCD terminology?


Thanks
Nikhil
 

nscpl said:
I am interfacing UC with LCD44780.
I am driving LCD44780 on 5V
can my signal voltage(data lines) be 3.3V?
Can I drive LCD44780 in 3.3V?
What is Z+ and Z- in LCD terminology?
Click to expand...

Check the data sheet of the LCD module. If the input logic low and high threshold is 2.5V, then your 3.3 volts interface should work.

Where do you see Z+ and Z- ? If it is on pin 15 and 16 then it is LED back light supply pins.

Cheers

Ravi
 

Where do you see Z+ and Z- ? If it is on pin 15 and 16 then it is LED back light supply pins.
Click to expand...

i agree ,

you can but, the display may show mild .

one second ,
lcd supply =5 v and you just driving it via 3.3v driver .........will work

or

lcd supply =3.3 v and you just driving it via 3.3v driver ........ will not work

plz clear it
 

manish12 said:
lcd supply =5 v and you just driving it via 3.3v driver .........will work
or
lcd supply =3.3 v and you just driving it via 3.3v driver ........ will not work
Click to expand...
LCD module will not work at 3.3 volts. It needs > 4.5 Volts.

Cheers

Ravi
 

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