backlight for CFAG128128B-TFH-VZ

[festigf]

hello,
I need to know that is a correct circuit about
backlight.
If there is an example I am happy!

thank very much
best regards
Gianfranco Festi

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[CF Tech]

There is a post here:

https://forum.crystalfontz.com/showthread.php?t=62

That explains backlight current limiting resistors.

Rlimit = (Vdd-Vled)/Iled

For the CFAG128128B-TFH, you have
Iled=80mA
Vled = 3.5v
Assuming Vdd = 5v

Rlimit = (5v-3.5v)/0.080 = 18.75 ohms

Use the next larger common resistor.