AVR-Chat

Thank you Leon,

Sorry, I thought that you were actually running it at 3 volts. Yes, I can
think of several ways to generate the negative voltage too... I will have to
think on it...

Thanks again,

Jim

----- Original Message ----- 
From: "Leon Heller" <leon.heller@bulldoghome.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Sunday, September 04, 2005 12:11 PM
Subject: Re: [AVR-Chat] 3 Volts LCD?


> ----- 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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