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'Large I2C memory ???'
1999\05\03@181916 by Chris Lauren

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<P>Hello there,</P>
<P>I am working on a PIC data logger and I need to store 1 to 2 MB (by 8 bit
word) of data in a non volatile memory, I can use several I2C devices, but I
wonder if anyone out there have seen any large capacity serial EE proms or
serial battery backed up ram chips ? (Access speed is not an issue)</P>
<P>Chris</P></FONT></DIV></BODY></HTML>

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1999\05\03@195625 by Gordon Varney

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1999\05\03@200256 by ryan pogge

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got any links to flash memory manufacturers?



Check out flash memory. 16 and 32 meg is nothing and will act much
like EEprom. Erasing is preformed in banks (1k or more), not bytes,
however you can use pointers to update data locations and change byte
info on the fly. There are techniques out there for doing this.

Gordon Varney
 ----- Original Message -----
 From: Chris Lauren
 To: spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU
 Sent: Monday, May 03, 1999 5:07 PM
 Subject: Large I2C memory ???


 Hello there,

 I am working on a PIC data logger and I need to store 1 to 2 MB (by
8 bit word) of data in a non volatile memory, I can use several I2C
devices, but I wonder if anyone out there have seen any large capacity
serial EE proms or serial battery backed up ram chips ? (Access speed
is not an issue)

 Chris

1999\05\03@201855 by William K. Borsum

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<x-rich>At 08:07 AM 5/4/99 +1000, you wrote:

>>>>

<excerpt>

Hello there,


I am working on a PIC data logger and I need to store 1 to 2 MB (by 8 bit
word) of data in a non volatile memory, I can use several I2C devices,
but I  wonder if anyone out there have seen any large capacity serial EE
proms or  serial battery backed up ram chips ? (Access speed is not an
issue)


Chris

</excerpt>


Yup.  They are called Camera memory Chips and a number of folks
manufacture them. Either I2C or SPI interfaces.  We build a series of OEM
data loggers and have built in an interface, but haven't gotten around to
implementing it yet since most of our clients don't need more than a few
thousand scans of data.  There are also some serial interface PCMCIA
cards out, but I am only going on rumor at this point.


Would appreciate some feedback when you find/implement a solution.


Will have a high speed version implemented in static ram up sometime in
the next couple of months for a new client needing 10K scans per second
for a few minutes of 24-bit data.


Existing systems are on our web page, but the new stuff isn't.  All our
stuff is available at the board level if something fits.


kelly





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All legitimate attachments to this email will be clearly identified in the text.

Please note our new address and phone numbers.


William K. Borsum, P.E.

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Escondido, CA 92046-2885


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Direct)         760-796-7788

<<.....borsumKILLspamspam@spam@dascor.com>

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1999\05\03@224345 by Mark Willis

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Use an array of scads of 24LC256's, is one possibility?  (Eww, I know
<G>)  (Scary that there're no datasheets on the Microchip text web site
for these, yet Digi-Key has them for sale...)

 Another possibility, not I2C but possibly will help;  Take a look at
the Atmel AT45D081 and/or AT45D161, off of:
(D081): http://www.atmel.com/atmel/acrobat/doc0871.pdf
(D161): http://www.atmel.com/atmel/acrobat/doc1081.pdf

 Both are available in 5V and 2.7V versions, paged, 10+ mHz serial
clocking rate, basically designed for SPI not I2C but you can get at
them with just 5 PIC pins easily enough, and you can get samples;
$10ish for the D081.  They're in "megabit" sizes, so the D081 is 8
megabit i.e. 1 megabyte;  264 bytes/page so you have room for Error
Correction or the like, if desired.  And two nice 264 byte registers in
there for your use as buffers.  (The D161 may be faster & have larger
pages, IIRC, I'm not using it though.)  I can talk to you more off-list
on it.

 Mark

{Quote hidden}

1999\05\04@011835 by Lynx {Glenn Jones}

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Atmel has 2Mbyte (if i remember right) that use SPI. They are flash.

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On Tue, 4 May 1999, Chris Lauren wrote:

> Hello there,
>
> I am working on a PIC data logger and I need to store 1 to 2 MB (by 8 bit word
) of data in a non volatile memory, I can use several I2C devices, but I wonder
if anyone out there have seen any large capacity serial EE proms or serial batte
ry backed up ram chips ? (Access speed is not an issue)
>
> Chris
>
>

1999\05\04@110838 by Andy Kunz

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x-html> At 08:07 AM 5/4/99 +1000, you wrote:

Hello there,

I am working on a PIC data logger and I need to store 1 to 2 MB (by 8 bit word) of data in a non volatile memory, I can use several I2C devices, but I wonder if anyone out there have seen any large capacity serial EE proms or serial battery backed up ram chips

Atmel has a Serial DataFlash product which can fill the bill, except it is SPI rather than I2C.  Several megs per chip, though, and the price is good.

Andy



==================================================================
   Montana Design Tech Support - http://www.montanadesign. com
==================================================================

1999\05\04@123059 by Craig Lee

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Shame Andy for that HTML post!

I'm more interested in a removable module like Sandisks or something PCMCIA.

Has anyone seen, not just heard the rumours, of something like this?

Craig


{Original Message removed}

1999\05\04@164211 by Mark Willis

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For 2Mb Compact Flash modules for $15 apiece or so, look on eBay, I
don't see the guy right now but one guy's had bunches of them (I bought
4, can find his e-mail address, use them instead of Floppy disks for the
PC110's here.)  Many other people sell 2Mb and larger CF modules.

 CF can be used in a PCMCIA slot, CF's a lot smaller & will run 3.3V or
5V, which is NICE.  50-pin interface, though, not quite as simple as SPI
(basically an IDE interface, I have the pinout here somewhere.)  Will
happily talk more off-list about it if you want!

 Mark

Craig Lee wrote:
>
> Shame Andy for that HTML post!
>
> I'm more interested in a removable module like Sandisks or something PCMCIA.
>
> Has anyone seen, not just heard the rumours, of something like this?
>
> Craig
>
> {Original Message removed}

1999\05\04@171608 by Andy Kunz

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At 10:27 AM 5/4/99 -0600, you wrote:
>Shame Andy for that HTML post!

Sorry Craig, but my e-mailer doesn't originate HTML.  I turned it off.  If
somebody SENT me e-mail, it might have replied that way, though, so go
smack him instad.

>I'm more interested in a removable module like Sandisks or something PCMCIA.
>
>Has anyone seen, not just heard the rumours, of something like this?

You can buy Sandisk connectors, so why don't you plunk one of them and an
Atmel Serial DataFlash on it?

Andy

==================================================================
  Montana Design Tech Support - http://www.montanadesign.com
==================================================================

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