Interfacing a Serial EEPROM Using SPI

Forum 2005-2010 (read only) Hardware Interfacing
1

Looking at:

Anyone know where I can get an AT25HP512 Serial EEPROM chip (or similar)?? I've checked Sparkfun, Globalspec, and Digikey.... with no luck for an order of 2...

Open to alternatives as well.

Thanks!!
-Hunter

2

http://parts.digikey.com/1/parts/540840-ic-seeprom-512k-1-8v-8lap-at25hp512-10ci-1-8.html

3

Open to alternatives as well.

If that includes I2C, the Microchip line has worked for me. I just flew a couple of 24LC256 EEPROMs on a balloon sensor package. I would have flown the 24LC1025, but I didn't pay enough attention to the data sheet when designing the circuit. Forum member BBR has provided working code at wulfden.org

I'm considering SPI myself, though, because I've got an application where I suspect the I2C speed (or, more precisely, lack thereof) will be an issue.

-j

4

Per Digi-key on purchase attempt....

"Unfortunately, part number AT25HP512-10CI1.8-ND has been made obsolete by the manufacturer and we can no longer distribute this product."

Anyone know of a comparable successor to it that would work in the above SPI tutorial?? Unfortunately I'm not awesome enough tackle I2C...

thanks!

5

Unfortunately I'm not awesome enough tackle I2C...

It's cut and paste the code from Wulfden. electrically it's easier than SPI.

If you can do SPI, you can do I2C.

To answer your question, I don't know about that part number, but search for it at Atmel's site and they may recommend a replacement part.
-j

6

Anyone know of a comparable successor to it that would work in the above SPI tutorial?

The ST Micro M95512 is pin- and function-compatible but it has a lower maximum clock frequency - 2MHz vs. 10MHz. Also, the Atmel AT25F512A is pin- and function-compatible and is faster, too - 33MHz. The ST Micro part is currently in stock at Mouser and Digi-Key has the AT25F512A in stock. Both are available only in surface mount packages, though.

If you're interested, Oak Micros offers a small adapter board to convert an SOIC-8 chip to PDIP-8 format. Look on the "Other Products" page to find it.

7

Speaking of Wulfden http://wulfden.org/TheShoppe/DataLogger/index.shtml

There is a datalogger board that you may be able to use :slight_smile:

8

thanks guys, i'll check it out wulfden and I2C, much appreciated