Author Topic: Device found on Digikey, but not here  (Read 1576 times)

mike65535

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Device found on Digikey, but not here
« on: July 08, 2016, 09:40:40 AM »
I am looking for 3.3V-compatible (for the control signals) character displays, preferably fairly large, lots of chars (say 4x40)

1. I found a device, NHD-0440AZ-FL-GBW, on digikey.com but for some reason it seems not to be available on this website.
(Here, the NHD-0440AZ-FL-YBW is available, but its inputs need to be 5V)
 Why is that device not available here?

2. Just as importantly, is that device truly 3.3V compatible?

-Mike
« Last Edit: July 08, 2016, 09:46:29 AM by mike65535 »

Saurabh_B

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Re: Device found on Digikey, but not here
« Reply #1 on: July 08, 2016, 12:04:37 PM »
HI Mike,

The NHD-0440AZ-FL-GBW is not a regularly stocked part, we would be able to make it however the display would have a 100pc MOQ.

Neither of these displays are compatible with 3.3V. We can also modify a display to make it compatible with 3.3V however it would be a custom part.

mike65535

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Re: Device found on Digikey, but not here
« Reply #2 on: July 08, 2016, 01:56:25 PM »
Thanks for the response.  However, I'm still trying to reconcile the information I've found...

The spec sheets for the two parts I mentioned differ significantly in their voltages:

Digikey page for NHD-0440AZ-FL-GBW...
http://www.digikey.com/product-detail/en/newhaven-display-intl/NHD-0440AZ-FL-GBW/NHD-0440AZ-FL-GBW-ND/1701248
...under "Datasheets" is a  link...
http://www.newhavendisplay.com/specs/NHD-0440AZ-FL-GBW.pdf
...in which it are the specs:
Input voltage                 VDD 2.7 - 5.5
H level input voltage    VIH 2.2V - VDD
H level output voltage  VOH 2.4V

New Haven Display's page for NHD-0440AZ-FL-YBW...
http://www.newhavendisplay.com/nhd0440azflybw-p-437.html
...is a "Product Specification" link...
http://www.newhavendisplay.com/redirect.html?goto=www.newhavendisplay.com%2Fspecs%2FNHD-0440AZ-FL-YBW.pdf&action=url
...in which are the specs

Supply Voltage           VDD      4.75 5.0 5.25 V
H Level input           Vih      0.7 VDD ‐ VDD V
H Level output         Voh     3.9 ‐ ‐ V


From the above, the New Haven Display-provided spec sheet for the part available on Digikey makes the claim the part *will* operate at 3.3V

Can you explain?  Thanks.

Saurabh_B

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Re: Device found on Digikey, but not here
« Reply #3 on: July 08, 2016, 02:27:36 PM »
That datasheet is from 2007, we haven't stocked that display for a very long time.
Newer glass and components would require 5V to function normally.

The controller for this display would now be the http://www.newhavendisplay.com/app_notes/ST7066U.pdf which would require 0.7*VDD for a logic High. ~3.5V.


mike65535

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Re: Device found on Digikey, but not here
« Reply #4 on: July 11, 2016, 07:06:52 AM »
So...

Is the display being sold by Digikey ( NHD-0440AZ-FL-GBW ) a 3.3V compatible unit or not?

Thanks.

Saurabh_B

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Re: Device found on Digikey, but not here
« Reply #5 on: July 11, 2016, 08:26:18 AM »
No, it is not.

The controller used in that display is no longer available. The electrical characteristics of that display would be similar to the display being sold on our website now.

 

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