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'i2c 8 pin eeprom > 8K help'
1999\03\19@143918 by Glen Torr

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Hi everyone,

Am doing a data logging project with 16C71 and am using 24LC65 memory which
is the largest I can get from uchip's australian dealer.
Can anyone tell me if they know of other manufacturers of 8 pin eeproms
using i2c interface... 64K (or bigger) would be real nice.
I have searched with no result.

Have a great weekend,

Cheers

Glen Torr

TorrTech

1999\03\19@152917 by Andy Kunz

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At 05:36 AM 3/20/99 +1000, you wrote:
>Hi everyone,
>
>Am doing a data logging project with 16C71 and am using 24LC65 memory which
>is the largest I can get from uchip's australian dealer.
>Can anyone tell me if they know of other manufacturers of 8 pin eeproms
>using i2c interface... 64K (or bigger) would be real nice.
>I have searched with no result.

Microchip makes 24128 and 24256 chips as well - I have samples.  You can
also put multiple chips on the same bus - have you looked at that?  (I have
done 8 chips - the max - which appear to the application to be one big 64K
byte memory).

I have also used the Atmel Serial DataFlash SPI parts to hold MEGS of data.
They use more power than EE, but they write just as fast.  The megs of
data is the real advantage.

Andy

  \-----------------/
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    \    |   |    /          Andy Kunz
     \   /---\   /           Montana Design
/---------+   +---------\     http://www.montanadesign.com
| /  |----|___|----|  \ |
\/___|      *      |___\/     Go fast, turn right,
                              and keep the wet side down!

1999\03\19@161454 by Barry King

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> Can anyone tell me if they know of other manufacturers of 8 pin eeproms
> using i2c interface... 64K (or bigger) would be real nice.
We use parts like this.
Try http://www.atmel.com  or  http://www.xicor.com

Tell me more about the application, I might be able to be more
specific.

> I have searched with no result.
untrustworthy search engine, given the above.

Good Luck!

------------
Barry King, KA1NLH
Engineering Manager
NRG Systems "Measuring the Wind's Energy"
Hinesburg, Vermont, USA
spam_OUTbarryTakeThisOuTspamnrgsystems.com
"The witty saying has been deleted due to limited EPROM space"

1999\03\20@003028 by Lynx {Glenn Jones}

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Try Atmel <http://www.atmel.com> they have up to 256Kbit EEPROMS in 8-bit (I2C)

------------------------------------------------------------------------------
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On Sat, 20 Mar 1999, Glen Torr wrote:

{Quote hidden}

1999\03\20@010546 by Vincent Deno

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Atmel makes a substitute for the 24C256.

On the part:

ATMEL801
24C256

I only glanced at the data sheet.  Seems the only difference is that only
two of the address pines are used (limited to only 3 devices on same bus).
Also, they can handle faster bus frequencies.  They are 256kbits
(32kbytes).  Hope this helps.

-Vincent


> Hi everyone,
{Quote hidden}

--------------
Vincent Deno
Design Engineer
Theta Digital Corp.
http://www.thetadigital.com
.....denovjKILLspamspam@spam@email.uc.edu
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1999\03\21@165005 by Holger Morgen

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hi -

I have once seen a very simpel use of an 8K DRAM w. a PIC. Yes, you must do
refresh and you can't loose power, but this should not be too big a problem
w. a datalogger.
Should I try and find more info?

/holger
hmospamKILLspamq8.dk

{Quote hidden}

1999\03\25@140549 by John Payson

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Microchip makes 24128 and 24256 chips as well - I have samples.  You can
also put multiple chips on the same bus - have you looked at that?  (I have
done 8 chips - the max - which appear to the application to be one big 64K
byte memory).

Although I've not actually done it, I think you should be able
to double the number of memory chips on the bus if you swap the
clock and data wires going to half of them.  You would need to
be somewhat careful of signal timings, but I don't think that
should be a problem since a chip can only activated by the seq-
uence [start 1 0 1 0] and a device you're not trying to access
would only be able to see a "1" if you raised and lowered the
data bit (of the device you were trying to access) while the clock
high.  Since that would never happen in the pattern required, the
off-side devices should simply sit idly.

Note that this trick does NOT apply to all I2C devices; anything
which may need to handshake on the clock wire may prevent the other
chips' data wire from rising when it should.  With memories, though,
I don't think that should be a problem.

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