Precision about Vih in NHD-0420DZW-AY5 specifications

hvilleneuve

• July 31, 2015 14:12

Hi, in the specifications for NHD-0420DZW-AY5, it is stated that Vih (min) = 0.9VDD.

If we are powering the LCD from VDD=+5V, it means that Vih should be higher than +4.5V, which is extremely high.

It seems to be an error. Can you confirm the minimum Vih when VDD=+5V

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  Michael_L

  • August 03, 2015 11:43

  The rating listed in the specification (Vih = 0.9*VDD) is confirmed to be correct.  Reliable operation can only be guaranteed if this requirement is met.

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  hvilleneuve

  • August 04, 2015 07:43

  Hi,
  it is also stated that VDD can be from 3.0 to 5.3V. But since the part number is ending with a "5", and in the cover page of the datasheet it is written "+5V power supply", can we power it from +3.3V? The specifications are very confusing.
  
  It seems to imply that there is a part number specifically for +3V devices...

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  Paul_B

  • August 04, 2015 07:54

  Morning,
  
  To answer your question the Supply Voltage (VDD) for NHD-0420DZW-AY5 can be anywhere from 3.0 (Min.) - 5.0 (Typ.) - 5.3 (Max.).
  
  This can be viewed on page 6 in the displays datasheet:

  https://newhavendisplay.com/content/specs/NHD-0420DZW-AY5.pdf 
  
  Hope this helps!

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  hvilleneuve

  • August 04, 2015 16:48

  Yes,
  I can read too. In fact, this is the EXACT information I talked about in my first post.
  
  This is still confusing. Why then do you state in page 1 then that the trailing 5 of the part number indicates "+5V power"?

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  Paul_B

  • August 05, 2015 09:58

  Morning,
  Sorry for the confusion, however I can assure you that the Supply Voltage (VDD) for NHD-0420DZW-AY5 is 3.0 (Min.) - 5.0 (Typ.) - 5.3 (Max.).
  
  The prefix "5" in the part number represents the displays typical voltage.
  
  Have a good one!  ;)
  
  
  [attachment deleted by admin]

  « Last Edit: August 05, 2015, 04:43:23 PM by Paul_B »

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