AVR-Chat

----- Original Message ----- 
From: "James Hatley" <james.hatley@comcast.net>
To: <AVR-Chat@yahoogroups.com>
Sent: Sunday, September 04, 2005 7:56 PM
Subject: Re: [AVR-Chat] 3 Volts LCD?


> Hello Leon,
>
> I too am looking for a true 3.3v capable LCD. I've examined the PowerTip
> display and true it's logic will run down to 2.7 volts. However, the LCD
> operating voltage still requires a volt lower voltage floor (4.1v voltage
> total) to achieve appropriate contrast control. (for the 1602D you use)
>
> How are you actually running your LCD units at 3 volts to overcome this? 
> do
> you use a small negative supply of some sort to provide this voltage?

I'm not actually running them at 3V. If I was, I'd probably use a simple 
charge pump driven by a toggled output to generate the negative voltage.

Leon 



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