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

[Robert Rademacher]

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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