Using EEPROM for data storage

Discussion in 'The Projects Forum' started by mattieg, Dec 9, 2008.

  1. mattieg

    Thread Starter New Member

    Nov 28, 2008
    8
    0
    Hi

    I'm designing a power monitor and am going to have a portable display that stores various values over time. This is wirelessly connected to a detector circuit that uses a cs5463 ic.

    My question is, would using eeprom be ok for writing to quite regulary. I'm planning to be able to show values that will be cumulative over time (around a months data or year if possible). It would be things like max current, cost of power over a week etc.

    I beleive this will require a lot of re-writing data stored and have read that eeprom isn't great for this?

    I'm using a PIC18F4520 and the eeprom I am looking at is the 25LC1024 from microchip.

    The unit is going to battery powered so need non voltaile memory thats cheap. I was thinking that I could reduce the number of writes by storing the data in on chip memory then periodically write this to the eeprom so would only lose a bit of data.

    Its only designed for use in domestic situation so accuracy isn't crucial so can afford to lose some data.

    Thanks for your help
     
    Last edited: Dec 9, 2008
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You might be interested in an outfit called Ramtron. They sell static memory products in both serial and parallel access. Mouser Electronics carries some of their stuff in their catalog (page 248). 4 meg (256 x 8) for $39.60.
     
  3. mattieg

    Thread Starter New Member

    Nov 28, 2008
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    Bit on the pricey side. Also am in UK and have to pay £16 to get it over here. Is static ram gona be the better choice than eeprom? I was hoping to spend no more than £2-3.
     
  4. mattieg

    Thread Starter New Member

    Nov 28, 2008
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    Also have limited number of pins so it will have to be a serial solution
     
  5. sammora28

    New Member

    Dec 9, 2008
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    hallo iam a new arab ingineering visitor and it is the first time to me to share and working on the net and i hope to find whomthey can helpe me to improve my experiences both in the net and high advanced electronics , thanks
     
  6. shoaibali

    New Member

    Jan 25, 2009
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    25LC1024 is quite slow in writing even a single byte (5ms approx.). If timing is not an issue that use of EEPROM would be fine. Otherwise, I would suggest serial Non-Volatile memory from Ramtron

    Regards
    Shoaib Ali
     
  7. GirishC

    Active Member

    Jan 23, 2009
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    0
    If you are very tight on price and pins and also you want to stick to 24CXX series. Then one thing you implement circular stack. So you keep stacking up on new location when done you you can go back to first location and start over. You will get pretty good throughput from the chip.
     
  8. n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
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    Last edited: Feb 4, 2009
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