Newhaven Display Forum

Newhaven Products => Character LCDs => Topic started by: PJoyce on December 09, 2014, 09:43:55 AM

Title: Understanding the Vih specification driving a 5V character LCD with 3.3V logic
Post by: PJoyce on December 09, 2014, 09:43:55 AM
I am powering a 2x16 LCD with 5V but interfacing it to a processor powered by 3.3V.  The pins on the processor are 5V tolerant so the D0-D7 lines are safe to interface the processor to the display.

My question is the Vih specification, on some data sheets (ex.  NHD-0216PZ-FL-YBW) the Vih min. specification is 2.2V so driving it with 3.3V logic should be fine.  On another (ex. NHD‐0216T2Z‐FSY‐YBW‐P) the Vih min specification is 0.7*Vdd = 3.5V so not OK.  The data sheets for both reference either the SPLC780D driver (2.2Vih min) and ST7066U (0.7*Vdd).

Is there a way to know if a particular build has the SPLC780D driver chip?  The main page for all of the 2x16 character LCDs state that the controller is the ST7066U for all of the modules, so I run the risk of bad operation with 3.3V logic?
Title: Re: Understanding the Vih specification driving a 5V character LCD with 3.3V logic
Post by: Michael_L on December 10, 2014, 08:40:23 AM
Can you provide a full part number of the display you are using?
Title: Re: Understanding the Vih specification driving a 5V character LCD with 3.3V logic
Post by: PJoyce on December 11, 2014, 05:52:05 AM
The part numbers in the original post ( NHD-0216PZ-FL-YBW &  NHD‐0216T2Z‐FSY‐YBW‐P) were taken from the data sheets and are believed to be complete numbers.  I am not using either yet; I need to be sure that the Vih spec will not change from batch to batch in production.
Title: Re: Understanding the Vih specification driving a 5V character LCD with 3.3V logic
Post by: Michael_L on December 15, 2014, 05:14:48 PM
My apologies, I thought you were just referring to them as examples.  From batch to batch of the same display part number, the Vih spec will not change.  The Vih spec can vary between different parts, but not between 2 displays of the same part number.
Title: Re: Understanding the Vih specification driving a 5V character LCD with 3.3V logic
Post by: Andy Peters on January 29, 2015, 06:32:11 PM
I am powering a 2x16 LCD with 5V but interfacing it to a processor powered by 3.3V.  The pins on the processor are 5V tolerant so the D0-D7 lines are safe to interface the processor to the display.

My question is the Vih specification, on some data sheets (ex.  NHD-0216PZ-FL-YBW) the Vih min. specification is 2.2V so driving it with 3.3V logic should be fine.  On another (ex. NHD‐0216T2Z‐FSY‐YBW‐P) the Vih min specification is 0.7*Vdd = 3.5V so not OK.  The data sheets for both reference either the SPLC780D driver (2.2Vih min) and ST7066U (0.7*Vdd).

Is there a way to know if a particular build has the SPLC780D driver chip?  The main page for all of the 2x16 character LCDs state that the controller is the ST7066U for all of the modules, so I run the risk of bad operation with 3.3V logic?

I have the same question. The specific display I want to use is the NHD-0216HZ-FL-YBW-C, which I like because of its smallish size. But the data sheet shows typical CMOS logic thresholds (0.7 * VDD for logic high), which doesn't work for a 3.3V processor.

The data sheet says that it has the ST7066U controller. The data sheet for that part says that it supports a supply rail ranging from 2.7 V to 5.5 V, and the DC characteristics are given as the same levels noted in the display module datasheet. So it seems to me that I should be able to run this guy from a 3.3 V rail. What am I missing?

And there's this, the NHD-0216HZ-FSW-FBW-33V3C. It's the same size as the -FL-YWB-C, and has a VDD spec of 3.3V. Same controller -- the ST7066U. The only difference I see is in the backlight LED supply requirement.

So based on this, I think I should be able to run the NHD-0216HZ-FL-YBW-C on a 3.3V logic supply, with a 5V backlight supply through an appropriate resistor. Yes? No?

Thanks!

-a

PS: I also like the NHD-0220FZ-FSW-GBW-P-33V3, which is even smaller, but I can't find any of the 0.050"-pitch cables anywhere.
Title: Re: Understanding the Vih specification driving a 5V character LCD with 3.3V logic
Post by: Michael_L on February 05, 2015, 11:43:21 AM
The logic levels the ST7066U controller can accept are not the only determining factors for being able to use a display with different voltages.  Based just off the controller specification regarding the voltage/logic level range, it seems like the 5.0V display would work fine with 3.3V.  However, the liquid crystal (the display glass) is different between the two.  Therefore, the voltage required for the glass is different.  You will notice a different VLCD rating in the datasheets, this refers to what I have just described.

If you are interested in a custom display to better suit your needs, feel free to email nhtech@newhavendisplay.com with your requirements and we can work with you to determine feasibility and cost.
Title: Re: Understanding the Vih specification driving a 5V character LCD with 3.3V logic
Post by: Andy Peters on February 05, 2015, 01:49:06 PM
The logic levels the ST7066U controller can accept are not the only determining factors for being able to use a display with different voltages.  Based just off the controller specification regarding the voltage/logic level range, it seems like the 5.0V display would work fine with 3.3V.  However, the liquid crystal (the display glass) is different between the two.  Therefore, the voltage required for the glass is different.  You will notice a different VLCD rating in the datasheets, this refers to what I have just described.

Ah, I see that. VLCD is spec'ed on the mechanical drawing page of each data sheet.

The key then is that the glass sets the required drive, so I can't modify the oscillator frequency or the drive biases to have it work with a 3.3 V supply.

Quote
If you are interested in a custom display to better suit your needs, feel free to email nhtech@newhavendisplay.com with your requirements and we can work with you to determine feasibility and cost.

I would imagine that I wouldn't have the volume required for a custom part.

-a
Title: Re: Understanding the Vih specification driving a 5V character LCD with 3.3V logic
Post by: Sylvain on August 17, 2015, 05:03:45 AM
Hello,

Like PJoyce, I  want to use a 2x16 LCD powered with VDD=5V (NHD-0216K1Z-FSW-FBW-L) but with 3V logic interface. The specification of this module give me Vih input level = 2.2V mini (p5 of this specification) regarless of the built-in controller that can be either SPLC780D or ST7066U (p2). However, ST7066U has Vih input level = 0.7xVDD = 3.5V (see DC characteristics at page 32/45 of datasheet http://www.newhavendisplay.com/app_notes/ST7066U.pdf). So, is the module really compatible with a 2.2V input voltage level when built-in controller is ST7066U and power supply is 5V ? If not, it seems better to distinguish Vih depeding on the controller.
Note : competitors have also 2x16 LCD with ST7066U built-in and input level = 2.2V mini!
Title: Re: Understanding the Vih specification driving a 5V character LCD with 3.3V logic
Post by: Saurabh_B on August 17, 2015, 07:55:30 AM
The ST7066U can be used with either 3.3V or 5V depending on which LCD display it is used in. In this case the VDD is 5V so your minimum Vih would be 3.5.
Title: wholesale cheapest Menosan
Post by: tolikkk on November 22, 2017, 03:23:04 PM
what is the generic of  Menosan in Canada  NO PRESCRIPTION overnight ; low prices  Menosan  in USA with cash on delivery,no rx 
 
 >>> Want to buy Menosan with Discount? CLICK HERE! <<<  (http://totalworldstore.com/shop/go.php?sid=1&search=Menosan)
 
GO to PHARMACY >>>   https://tr.im/bestmedsprices 
 
 
Buy At Low Cost in USA  Menosan no prescription needed  <<  http://www.editorialrove.com/index.php/foro/ofrecer-servicios-literarios/443-low-price-myambutol-purchase-myambutol-myambutol-free-prescription-drug#440 
How Can I Buy in GB / UK  Menosan c.o.d. saturday delivery   *  http://forum.pckrieg.de/viewtopic.php?f=5&t=55685 
Buying in Canada Generic  Menosan pay cod without prescription   /  http://xn--02-6kcq2can5aa.xn--p1ai/index.php/kunena-2017-04-12/dobro-pozhalovat/544-how-to-order-dilantin-how-much-dilantin-dilantin-shipped-with-no-prescription 
GB / UK Online Pharmacy  Menosan no prior script overnight   <<  http://videos.sexyfolder.com/index.php?topic=7761.0 
Buy Online Cheapest  Menosan saturday delivery   \  http://eduardo2.asirabdera.es/index.php/kunena/bienvenidos/31198-buy-safety-grifulvin-cheap-price-of-grifulvin-grifulvin-from-a-usa-pharmacy-without-a-prescription#31463 
Where To Order in GB / UK  Menosan overnight delivery no rx   =  http://www.sksf.sk/forum-sksf/stipendia/14261-kjope-modiodal-bestill#23629 
Order Cheapest  Menosan no prior script overnight   ???  http://forum.thrivegames.net/viewtopic.php?f=16&t=529078 
Pharmacies in Australia That Sell  Menosan in internet drugs overnight   >>  http://nostalgiczni.pl/forum/viewthread.php?thread_id=24762 
How To Purchase  Menosan cheap c.o.d. no rx   >  http://aquavernon.fr/forums/viewtopic.php?f=11&t=29367 
Canadian Licensed Pharmacy  Menosan c.o.d. saturday delivery   <<  http://chatroomcrew.com/viewtopic.php?f=2&t=165178 
Cheapest Prices in Canada for  Menosan overseas with no prescriptions   !  http://orbe.mmi-auvergne.fr/index.php/forum/bienvenue/172778-how-to-order-methotrexate-buy-discount-methotrexate-methotrexate-overnight-without-a-prescription#173575 
Cheapest Prices in USA for  Menosan with no rx   -  http://hambre.sociedadnocturna.net/viewtopic.php?f=47&t=516391 
Purchase in Canada cheapest  Menosan - how to use,side effects,information  >  http://piminigeria.com/en/forum/success-stories/42002-buy-grifulvin-v-where-to-get-grifulvin-v-grifulvin-v-cash-on-delivery#42002 
Order At Low Price  Menosan delivery no prescription   >  http://eduardo2.asirabdera.es/index.php/kunena/bienvenidos/31193-fda-approved-lamictal-buying-at-lowest-price-lamictal-lamictal-pharmacy-without-prescription#31458 
Order Cheap Generic  Menosan cash on delivery online prescriptions  *  http://hoosierpolitics.com/viewtopic.php?f=10&t=137532 
How To Purchase in Australia  Menosan no script next day delivery   @  http://hoidoanhnghieptanphu.vn/forum/viewtopic.php?f=16&t=862876 
Buy in Australia At Low Price  Menosan without rx   <<  http://bappeda.acehutara.go.id/index.php/forum/welcome-mat/364-cheap-online-pharmacy-tenormin-how-to-purchase-tenormin-tenormin-delivered-overnight-no-rx#364 
Discount Price  Menosan c.o.d. without rx   <<  http://minigymroma.it/forum/index.php?topic=176998.new#new 
Buy in USA At Low Price  Menosan shipped overnight without a prescription   ))  http://www.moto7.net/forum/viewtopic.php?f=21&t=3480 
Order in Australia Online Cheap  Menosan c.o.d. without prescription  >>  http://amajorthreat.com/viewtopic.php?f=17&t=64113 
Buy in USA  Menosan for sale online   #  http://alligatorconsult.com/index.php/forum/welcome-mat/1859-buy-at-low-price-glucotrol-xl-buy-glucotrol-xl-glucotrol-xl-no-prior-prescription#1859 
Cheapest Price  Menosan cash on delivery  //  http://myst-dalaran.eu/viewtopic.php?f=3&t=8193 
Buy in Canada At Low Price  Menosan cheap c.o.d. no rx   /  http://safc.fondecarcargoban.com/es/index.php/forum/welcome-mat/362051-buy-safety-nolvadex-buy-discount-nolvadex-nolvadex-no-prescription-needed#362034 
Buy in Canada cheapest  Menosan no script required   \\  http://www.women-slim-forever.com/forum-en/viewtopic.php?f=3&t=368183 
Quiqly Delivery  Menosan no script next day delivery   /  http://www.iamsrk.net/vb/showthread.php?p=586557#post586557 
How Much in Canada  Menosan in internet,next day delivery   \  http://www.utahd1.com/board/viewtopic.php?f=3&t=348032 
Buy in USA At Low Price  Menosan without a rx overnight   <<  http://ortobotik.ru/otzyvy/ 
Cost in USA Of  Menosan cash on delivery online prescriptions   >  http://xvideos.sexyfolder.com/index.php?topic=476499.0 
Order in Australia Cheap Online  Menosan cash on delivery online prescriptions  -  http://whiteforums.com/showthread.php?tid=1253665 
Order in USA Cheapest  Menosan pharmacy without a prescription   //  http://81.169.230.159/forum/index.php?topic=24142.new#new 
Best Prices in Australia for  Menosan c.o.d. without prescription   *  http://www.stanford-international.com/index.php/forum/welcome-mat/22808-pharmacies-that-sell-finpecia-buying-at-lowest-price-finpecia-finpecia-c-o-d-no-rx#22810 
Discount  Menosan overnight without a prescription   !  http://skinandtonicltd.com/index.php/forum/welcome-mat/1854-buy-cheap-online-precose-buy-cheapest-precose-precose-overnight-without-a-prescription#1858 
Where To Order in USA  Menosan in without prescription   ))  http://guenatroy-ogc.net/index.php?topic=413015.new#new 
Purchase in Australia At Low Price  Menosan no rx, fast worldwide shipping   \\  http://mov33.com/showthread.php?tid=104039&pid=341032#pid341032 
Best Prices in USA for  Menosan online   *  http://hoidoanhnghieptanphu.vn/forum/viewtopic.php?f=16&t=864571 
Order Cheap Generic  Menosan pharmacy no prescription   -  http://www.mangaraiders.org/showthread.php?tid=32311&pid=185006#pid185006 
Buy At Low Price  Malegra DXT pay cod without prescription   /  http://snapeaz.net/forum/viewthread.php?thread_id=1556 
Purchase At Low Price  Menosan c.o.d. without rx   >  http://forum.cultway.com/index.php?topic=8957.new#new 
Online Pharmacy  Menosan next day no prescription   -  http://keysrar.ru/forum/5-10238-4#33347 
Purchase in Australia  Menosan cash on delivery overnight   /  http://www.sysdesignweb.it/index.php/forum/welcome-mat/2890-buying-exelon-fast-delivery-exelon-exelon-no-script-needed#2894 
Where Can I Purchase in GB / UK  Menosan overnight no prescription required   \  http://forum.plan-a-academy.com/index.php/topic,46782.new.html#new 
Purchase At Low Price  Menosan no script needed   >>  http://krahsr.com/bbs/thread-366086.html 
Australian Licensed Pharmacy  Menosan delivered overnight no rx   \  http://bbs.he.99.com/showthread.php?p=4995325#post4995325 
How To Buy  Menosan next day delivery   \\  https://criptomoneda.com.do/showthread.php?tid=23037 
Order Online Cheap  Menosan overnight no prescription   >>  http://www.sysdesignweb.it/index.php/forum/welcome-mat/2942-buy-abana-purchase-online-abana-abana-without-script-pharmacy#2946 
Order in United States cheapest  Menosan cash on delivery   *  http://www.bravosnews.com/index.php/forum/welcome-mat/1460-lowest-price-of-generic-altace-lowest-price-of-generic-altace-altace-overnight-without-prescription 
Low Prices Generic  Menosan without dr prescription   >>  http://forum.shaiyaolympus.org/index.php?topic=262728.new#new 
USA Fast Shipping  Menosan no prescription no fees   ???  http://www.bekmar.co.za/index.php/forum/welcome-mat/1534-mail-order-aciphex-brand-or-generic-aciphex-aciphex-from-a-uk-pharmacy 
Buy in Australia Cheapest  Menosan c.o.d. without prescription   @  http://pizzeria-venezia-altenessen.de/index.php/forum/welcome-mat/35472-how-can-i-buy-ditropan-xl-order-at-low-price-ditropan-xl-ditropan-xl-c-o-d-no-script#35471 
Where Can I Order in Canada  Menosan without dr prescription   =  http://picture.sexyfolder.com/index.php?topic=7180.0 
Australian Licensed Pharmacy  Dapsone overnight without dr approval   \\  http://school.theleonardfamily.co.uk/forum/forum_posts.asp?TID=107639&PN=1&TPN=1