Author Topic: Precision about Vih in NHD-0420DZW-AY5 specifications  (Read 2516 times)

hvilleneuve

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Precision about Vih in NHD-0420DZW-AY5 specifications
« on: July 31, 2015, 02:12:19 PM »
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

Michael_L

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Re: Precision about Vih in NHD-0420DZW-AY5 specifications
« Reply #1 on: August 03, 2015, 11:43:36 AM »
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.

hvilleneuve

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Re: Precision about Vih in NHD-0420DZW-AY5 specifications
« Reply #2 on: August 04, 2015, 07:43:27 AM »
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...

Paul_B

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Re: Precision about Vih in NHD-0420DZW-AY5 specifications
« Reply #3 on: August 04, 2015, 07:54:17 AM »
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:

http://www.newhavendisplay.com/specs/NHD-0420DZW-AY5.pdf

Hope this helps!


hvilleneuve

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Re: Precision about Vih in NHD-0420DZW-AY5 specifications
« Reply #4 on: August 04, 2015, 04:48:27 PM »
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"?

Paul_B

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Re: Precision about Vih in NHD-0420DZW-AY5 specifications
« Reply #5 on: August 05, 2015, 09:58:06 AM »
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!  ;)


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

 

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