LED backlight resistors for NHD-C12864A1Z-FS(RGB)-FBW-HT1
Hi, the datasheet of NHD-C12864A1Z-FS(RGB)-FBW-HT1 mentions that the on-board resistors are of 0ohms in page3. The values of Vf for the LEDs are not mentioned in the datasheet (only the max current values are mentioned). Are external resistors needed for current limiting?
Can someone tell if there is any on-board resistance for the LED pins? What are the typical Vf values of the R, G and B LEDs?
Thanks in advance.
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Hi,
The NHD-C12864A1Z-FS(RGB)-FBW-HT1 has 0-ohm resistors available for the RGB Cathode pins 10,11, and 12. For which thee resistance on these pins can be changed to limit the LEDs and adjust the color.
The additional resistors (shown above in the drawing of the backlight circuit) limit the current internally to the values indicated by the Electrical Characteristics table.
Which also provides the typical forward voltage for the RGB LEDs to be 3.3V.
Please let me know if you would like further clarification.
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Hi,
Okay, so if I use 3.3V for the LED common anode pin, I can simply leave the 0 ohm as it is, right?
The additional resistors should limit the current internally I guess. Can you please let me know your comments?
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Hi,
Yes, it is okay to connect the display anode pin directly 3.3V and the cathode pins for RGB to ground without an additional resistor.
Any additional resistance to the 3 cathode pins can serve to adjust the color hue of the backlight.
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Hi, thank you for the detailed explanation. This helps....
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