interface voltage levels for NHD-0420CW

oldmaker

• February 12, 2015 07:48

Hi,
I just purchased two OLED character displays, NHD-0420CW-AB3 and NHD-0420CW-AG3, for a new prototype.
I have a doubt: in the datasheet I read "H Level input 0,8*VDD; L Level input 0,2*VDD".
VDD is 2.8V, also when I choose 5V operation (REGVDD); so does it mean the interface levels are referred to 2.8V, even when power supply voltage is 5V ?
Or the interface levels are automatically adapted to the actual power supply voltage ?
May anyone clarify my doubt ?
Thank you very much.

    Pasquale

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  Paul_B

  • February 12, 2015 08:23

  Hello Pasquale,
  The logic voltage levels will be based on the supply.
  
  With a 2.8V supply, H Level input = 0,8*2.8; and L Level input = 0,2*2.8
  With a 5.0V supply, H Level input = 0,8*5.0; and L Level input = 0,2*5.0
  
  Hope this helps!

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  oldmaker

  • February 12, 2015 13:47

  Wonderful !   :)
  Thank you very much, Paul.

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  Paul_B

  • February 12, 2015 13:56

  No problem, have a good one!  :)

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