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View Full Version : FRAM instead of EEPROM on Propeller



Timothy D. Swieter
07-10-2009, 02:10 PM
I got an e-mail today that pointed out Ramtron's latest EEPROM or rather EEPROM replacement offerings:

64K version: www.ramtron.com/files/datasheets/FM24CL64ds_r3.3.pdf (http://www.ramtron.com/files/datasheets/FM24CL64ds_r3.3.pdf)
32K version: www.ramtron.com/files/datasheets/FM24CL32ds_r1.0.pdf (http://www.ramtron.com/files/datasheets/FM24CL32ds_r1.0.pdf)

The FRAMs would make sense in applications where there is constant data logging or changing data. The 64K version appears to have been out for a while and I see various listings at on-line distributors. The price isn't cheap though for single quantities (~US$3.00) in single quantities.

Since this is designed as a drop in replacement, I suppose it might be worht it to try it out and see that it works OK. I have a data logging application where it would be nice to have the speed of FRAM.

Here is the news note from Elektor's web site: www.elektor.com/news/nonvolatile-ram-replaces-serial-eeprom.1008353.lynkx?utm_source=UK&utm_medium=email&utm_campaign=news (http://www.elektor.com/news/nonvolatile-ram-replaces-serial-eeprom.1008353.lynkx?utm_source=UK&utm_medium=email&utm_campaign=news)

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Timothy D. Swieter, E.I.
www.brilldea.com (http://www.brilldea.com) - Prop Blade, LED Painter, RGB LEDs, 3.0" LCD Composite video display, eProto for SunSPOT
www.tdswieter.com (http://www.tdswieter.com)

MagIO2
07-10-2009, 02:47 PM
Works perfectly. Just replace the EEPROM. I have the 64kB version running since a few month. When I have some time I'd like to find or maybe write a better driver, as the read/write speed can be improved.
When I'll do my first board I'd like to put 2 64kB FRAMs on it. With a simple switch I can select between 2 programs to be booted.

Timothy D. Swieter
07-10-2009, 03:55 PM
Thanks for the feedback MagIO2. I agree with you on writing a driver that takes advantage of the speed capability. The switching back and forth can be done with a header and a shunt plug on it.

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Timothy D. Swieter, E.I.
www.brilldea.com (http://www.brilldea.com) - Prop Blade, LED Painter, RGB LEDs, 3.0" LCD Composite video display, eProto for SunSPOT
www.tdswieter.com (http://www.tdswieter.com)

Mightor
07-10-2009, 07:16 PM
I have ordered a few samples of the 1024Kb and 64Kb models. When ordering samples, make sure you don't ask for more than 4 of each chip or it will need special approval!

Regards,
Xander

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