Professional Development Board - Bigger Eprom

pacman

Having just taken delivery of professional development board (Hooray for me!! {and thanks Ron Nollet}) i am wondering what is the _recommended_ replacement chip for the Eeprom (say 64K in size)?

I know many must have done it...

What works as a cost effective / reliable /pain free brand/model?

Thanks in advance

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MagIO2

Why not replace it with an FRAM? Brand is Ramtron and it woks like a charm. I accidently ordered the 5V version and even these work perfectly in the 3,3 V propeller environment. It's available with 64k - dunno if there is a version with 128k. But they have versions with an RTC .. can't say if these are pin compatible with the EEPROMS, but it would make sense, as they can simply use the I2C to communicate with the RTC.

Advantages of FRAM: Faster write and it's MTBF is much higher. Especially for a development board I think that this is a big advantage. Or if you have programs that use EEPROM to store the current state from time to time. With an FRAM you really don't need to worry about failure of the "EEPROM".

If you want to stay with EEPROMs .. I think 128k is the biggest available for I2C. 24?1024 ? The 64k is 24?512. Brand .. Microchip for example.

Cluso99

AT24C512 is the 64K EEPROM. IIRC, the FRAM is not compatible with the boot sequence of the prop and the pinout is different.

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MagIO2

Oh ... I'm sorry ... I did not recognize that my boards only looks like running with an FRAM ... damn .... maybe it's because I never did more than looping and waiting ;o)

I only use FRAM and I did a direct replace of the EEPROM which came with the gadgetgangster board, so:
1. I'm sure it works
2. I'm sure it can replace the EEPROM directly
3. I'm sure it boots

Maybe you looked at the wrong part? Ramtron offers FRAM with different interfaces. But that one is meant as a direct replacement of I2C EEPROMs.


PS: Guess I see what you mean with not pin compatible ... it's not available in DIP package ... right ... but you only have to solder some wires and it perfectly fits into the socket of the gadgedgangster board ... does the professional development board have a socket for the EEPROM?

Post Edited (MagIO2) : 3/1/2010 9:02:52 AM GMT

dMajo

I have a FM31L278 in place of the original eeprom on my PPDB and it works. This is a processor companion so the pinout is different starting from the package (soic14)

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Tapperman

pacman said...
Having just taken delivery of professional development board (Hooray for me!! {and thanks Ron Nollet}) i am wondering what is the _recommended_ replacement chip for the Eeprom (say 64K in size)?

I know many must have done it...

What works as a cost effective / reliable /pain free brand/model?

Thanks in advance

Congradulations on your upgrade ... I have a question along this same line ... I have an extra 32K EEPROM chip and I'm currious, can I daisy chain and mapp it in addition to the 32K already on the PPDB?· I'm asking any reader who might know!

If so, does the A0 pin have to be tied HIGH?··

Post Edited (Tapperman) : 3/2/2010 3:03:28 AM GMT

MagIO2

It's not a daisy chain. You attach em paralel to the I2C bus. And yes .. you have to select a different address, so you'd put one of the address lines high.