LCD 16x2 3.3V

[SPRX]

I am chasing 3.3v 16x2 LCD for my project prototype for a reasonable cost, (as I am planning to make about 50 units initially if all goes well). 3.3v version of LCDs seems fairly expensive compared to its 5v counterpart.

Could anyone tell about a fairly reasonable source for this beast

[mariush]

http://www.newhavendisplay.com/nhd0420azflgbw3v3-p-2003.html

4x20 for 6$ on sale.

a 5v version is 4$ on sale : http://www.newhavendisplay.com/nhd0420dznswbbwrev0-p-5210.html

[Mr Smiley]

Or see Dave's Friday fundamentals, using a charge pump to power 1602 lcd modules 

 

[SPRX]

http://www.newhavendisplay.com/nhd0420azflgbw3v3-p-2003.html

4x20 for 6$ on sale.

a 5v version is 4$ on sale : http://www.newhavendisplay.com/nhd0420dznswbbwrev0-p-5210.html

Thanks mariush, seems a good deal and will try.

Or see Dave's Friday fundamentals, using a charge pump to power 1602 lcd modules 

 

Thanks Mr Smiley, I saw this, but is this a common practice to drive a LCD ?  Interented to see common practices for LCDs on a low voltage hand held devices.

[marshallh]

You can just run 3.3v I/O into the 5v lines. As long as its one way.

Bet the actual logic will run fine on 3.3 also. May have to tweak for contrast.

[SPRX]

You can just run 3.3v I/O into the 5v lines. As long as its one way.

Bet the actual logic will run fine on 3.3 also. May have to tweak for contrast.

Thanks, I tried the 5v LCD modules I have on my hand with my 3.3v PIC 24fj128  microcontroller directly, but until you provide 5V on the Vdd, LCD is not happy, and mostly showing garbage.

Any suggestions please 

[iloveelectronics]

Have you tried “1602 3.3v” on eBay?

[ElektroQuark]

http://www.newhavendisplay.com/nhd0420azflgbw3v3-p-2003.html

4x20 for 6$ on sale.

a 5v version is 4$ on sale : http://www.newhavendisplay.com/nhd0420dznswbbwrev0-p-5210.html

Could not find shipping cost without register (I Hate this).

[komet]

I believe that this is 3.3V-compatible

eBay auction: #220868669255

The S6A0069 is certainly a 3.3V chip, but you might want to confirm with the seller. I bought some but they've not arrived yet, so I can't tell you for sure.

[iloveelectronics]

I believe that this is 3.3V-compatible

eBay auction: #220868669255

The S6A0069 is certainly a 3.3V chip, but you might want to confirm with the seller. I bought some but they've not arrived yet, so I can't tell you for sure.

Hmm...it says Vss and Vdd =5V in the description...

[poorchava]

5V LCD modules are problematic to drive directly from LVCMOS logic, because they typically have VIH defined as 0.7*VCC which in this case equals 3.5V.

Standard TC7660 charge pump should be enough.

You can also use dedicated level shifters. I'm using SN74LVC4245A from TI (bought a bunch some time ago, they are like 0.40 € in retail in Poland), although probably there are 20 other 74xx chips that you can use for that.

edit:
a second thought: maybe you can try old mobile phone GLCD? Like the ones from nokia 3310. They are dirt cheap on ebay and the topic is well understood on every microcontroller-related forums. And is has a serial interface which saves some pins in comparison to 16x2 displays.

[komet]

I believe that this is 3.3V-compatible

eBay auction: #220868669255

The S6A0069 is certainly a 3.3V chip, but you might want to confirm with the seller. I bought some but they've not arrived yet, so I can't tell you for sure.

Hmm...it says Vss and Vdd =5V in the description...

Yeah, sorry, I'm probably being an idiot. Still, it's not uncommon for chinese sellers to have incorrect descriptions...

[SPRX]

Thank you for all replies.

Nokia 5110/5146 seems like a good candidate for the application, with few code and PCD design change.

I will also test 5v module with a charge pump, as most of you seems comfortable with it, and probably easier to do with it. Any one of you had used TEXAS REG710NA-5/250 (3.25V to 5v) or similar ?