cascading eeprom!!!

guest · Guest

Hi everyone,

I am using the 24lc256's driver file (24256.c) as a driver to my Atmel's 24cxx eeprom(32kbytes). I was wondering if there is any way to cascade two or more such eeproms to get larger capacity (of 64kbytes or more ).
If there is a way to cascade then what hardware connections are needed and how each cascaded memory is to be addressed in the code.
I have a compiler version ver 3.203.

Regards
ft

Humberto · Posted: Tue Jan 31, 2006 8:31 am

It is very straightforward to connect multiple devices. Except if you are using the MOSP
package, up to 8 devices can be connected sharing the same I2C bus + 3 address lines
(A0, A1, A2) to select them. The datasheet get you this info.

Humberto

treitmey · Joined: 23 Jan 2004 Posts: 1094 Location: Appleton,WI USA

And I wrote a driver for the RAMTRON FRAM FM24C256
http://www.ccsinfo.com/forum/viewtopic.php?t=24099
That shows the memory as a flat address space.

note that FM24C256 and your chip are not the same...
Fram is much faster.

But this will give you ideas on how to handle a multi-write that spans
2 chips.

ie you have to do a stop at last address. Then a start, addr of next chip
...