[Icc-avr] Re: Doubts using external memory variables

[Paul Mateer]

Hello All....
I just recently mapped a 24LC64 (8kx8 Serial EEPROM) for storage of a
user-adjustable look-up table and it too works like a charm.



On Oct 30, 2007 3:11 PM, Robert Rademacher <robertrade at yahoo.com> wrote:
> Date: Tue, 30 Oct 2007 13:58:28 +0100
> From: Guillermo Meg?a Palma
> Subject: [Icc-avr] Re: Doubts using external memory variables
> Hi Guillermo (and others),
>
> In the past,  I use external RAM with battery backup on my system design
> because the the non-volatile EEPROM has the limited write life (and too
> expensive). Like what you just described here, I too had to deal with
> internal/external RAM to store the variables.
>
> With the available of fast non-volatile FRAMs offered by Ramtron (and other
> companies) that would give unlimited fast read/write, which can hold up to
> 512kB data, I redesigned the control system last year to use FRAM, using
> TWI(I2C) configured at 1Mb speed, which works like charm. I use the
> structure data to read/write data to/from FRAM, which would need two
> functions (one for read, and one for write) with defined address space to do
> the job nicely. I have the system running for more than one year without any
> failures, as well as the cost savings too.
>
> I strongly encouraged everyone to take a good look at EEPROM (with large
> number of write life) or FRAM to replace the battery-backed RAM, as well as
> the real estate space saving on your board.
>
> Just my 2 cents,
>
> Robert J. Rademacher
>
>
>
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-- 
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com