AVR-Chat

Hi,

    Getting Maxim parts down in Brazil is a big problem....

    I changed the circuit to use a voltage divider.. Space is not a problem 
at this application and this way I will not be violating any chip specs.. 
Better safe than sorry :-)

Best regards,
Alexandre Guimaraes

----- Original Message ----- 
From: "xolang1" <xolang1@yahoo.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Sunday, June 24, 2007 8:10 AM
Subject: Re: [AVR-Chat] Interfacing a 5 Volts LCD to a 3.3 Volts system.


ever tried max3000 from maxim? its a biderectional logic level translator,.

Alexandre Guimarães <listas@logikos.com.br> wrote:          Hi,

I have to interface a 5 volts 160x160 LCD display to a 3.3 volts system
and after reading the LCD specs I am quite sure that I will not violate the
minimum voltage levels of the inputs but I may have to use partially the LCD
memory for other functions so I may have to use it bi-directionaly. My CPU
will be a AtMega324P. Will series resistors to limit current in the data bus
be enough in this case ? I have not found any specs in the data sheets about
how much current the internal protection diodes on the AVR's would take :-(

Best regards,
Alexandre Guimaraes






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