Author Topic: Valid VCC Range for NHD-0216MW-AB3  (Read 553 times)

frightless

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Valid VCC Range for NHD-0216MW-AB3
« on: August 25, 2019, 02:27:16 PM »
I am designing a product using the NHD-0216MW-AB3 COG display.

The product spec for the NHD-0216MW-AB3 gives limits of +8.5V to +9.5V on VCC (the display supply). The US2066 controller spec, however, gives VCC limits of +8.0V to +15.0V.
My power network already includes a +12V supply, which I would love to use for VCC. I can regulate to +9V for just this chip, but it adds a few components to the BOM and clutters a section of the board.

A few questions for those who have worked with the board:
Is the +8.5V to +9.5V range just a recommendation? Or is there additional hardware in this display that requires I stay within it? I'd rather not test with mine and fry it.
The US2066 spec gives an Iref voltage of (VCC - 4.5V). Does this still hold for the NHD-0216MW-AB3?

Thanks in advance for any insights.

Ted_M

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Re: Valid VCC Range for NHD-0216MW-AB3
« Reply #1 on: August 27, 2019, 05:02:57 PM »
The datasheets Optical Characteristics table is based on setting the typical value of +9V  for VCC.  This voltage is mainly used to power the OLED Glass.
Increasing this voltage will affect the OLED display's brightness and contrast along with affecting the lifetime hours to half brightness of the display.
A higher VCC voltage will not affect the logic circuitry as this is powered separately by the 5V or 2.8V VDD supply.
The calculations for Iref (used for setting the maximum contrast based on VCC) in the US2066 datasheet will also support the NHD-0216MW-AB3.

Best Regards,

frightless

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Re: Valid VCC Range for NHD-0216MW-AB3
« Reply #2 on: August 27, 2019, 09:42:40 PM »
Thank you for the quick reply! Fortunately this is a non-critical, light-duty application. 25,000 hours to half-brightness is miles beyond where we need to be.

One more question -- any idea whether we could tack on a few kOhm to the current limiting resistor (intentionally dropping current below the 15uA) to counteract these effects?

Ted_M

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Re: Valid VCC Range for NHD-0216MW-AB3
« Reply #3 on: August 28, 2019, 02:18:57 PM »
Changing the resistance to lower the Iref will affect the overall contrast level range that can be adjusted in software, however it may not produce a counteracting effect to the displays lifetime. This would still be dependent on the contrast level the display is set to while using the higher VCC voltage.

Best Regards,


 

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