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CFAG16080A-YYH-TZ contrast circuit...

Ralpha

New member
I'm looking at the datasheets for the CFAG16080A-TMI-TZ and the CFAG16080A-YYH-TZ. The circuits to control contrast are different, but the voltage requirements for powering the LCD are the same. How can this be?

For the CFAG16080A-TMI-TZ:

http://www.crystalfontz.com/products/16080a/CFAG16080ATMITZ.pdf

Vdd is connected to the top pin of the potentiometer
Vo is connected to the center pin
Vee is connected to the lower pin

For the CFAG16080A-YYH-TZ:

http://www.crystalfontz.com/products/16080a/CFAG16080AYYHTZ.pdf

Vdd is connected to the top pin of the potentiometer
Vo is connected to the center pin
The lower pin is grounded

It doesn't seem that the connection for the CFAG16080A-YYH-TZ would provide sufficient voltage to power the LCD? Is there an error in the datasheet?
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CF Tech

Administrator
Looks like a typo at first glance. I think the CFAG16080ATMITZ is correct.

I will ask CF Support to look at it tomorrow and find out if there is an error.
 

Ralpha

New member
Thanks.

I also think the value for the expected negative voltage output Vee is incorrect.

It probably should be closer to -10 V.
 

Ralpha

New member
I have a question about the LCD. The negative voltage output fluctuates a bit, which, in turn, causes the display to blink. I think the unit may be getting too much current. What do you think?
 
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