Newhaven Display Forum

Newhaven Products => OLEDs => Topic started by: oldmaker on February 12, 2015, 07:48:38 AM

Title: interface voltage levels for NHD-0420CW
Post by: oldmaker on February 12, 2015, 07:48:38 AM
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
Title: Re: interface voltage levels for NHD-0420CW
Post by: Paul_B on February 12, 2015, 08:23:58 AM
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!
Title: Re: interface voltage levels for NHD-0420CW
Post by: oldmaker on February 12, 2015, 01:47:16 PM
Wonderful !    :)
Thank you very much, Paul.
Title: Re: interface voltage levels for NHD-0420CW
Post by: Paul_B on February 12, 2015, 01:56:20 PM
No problem, have a good one!  :)