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Thread: Mitsubishi SRAM Melcard query

  1. #1

    Default Mitsubishi SRAM Melcard query

    Hi,
    I've just fitted a new battery (lithium 3V, 2325 size) to my 2MB SRAM Melcard (PCMCIA card), which is working fine. Recognised by XP laptop, can format (FAT) and save and read files.

    On the back of the card is a space to write a 'Battery Expiration' date, but I have no idea how long a new battery should last. I can't find a manual (Bitsavers just has a massive slide pack on RAM / ROM products).


    Has anyone got a manual please or any experience on battery life?


    Thanks,
    John

  2. #2
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    Default

    A lithium "keep alive" battery should be good for at least 5-7 years.

  3. #3

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    Thanks. I found this on: https://web.archive.org/web/20010429...dukte/sram.htm


    Very low current consumption: 0.1 mA - 0.3 mA standby current / 1.4 A - 17 A battery back up current

    and a list of card sizes from 256KB to 4MB

    So assume:
    4MB = 17uA
    256kB=1.4uA

    gives approx:
    2MB = 8.5uA
    1MB = 4.3uA to 5.6uA
    512kB=2.8uA

    So can then estimate life based on mAhr rating of the coin cell used.

    Regards,
    John

  4. #4

    Default

    Found the datasheets for a range of MELCARDs including my one:

    http://pdf1.alldatasheet.com/datashe...7-J8CATXX.html

    Some use 2025 battery and some (like mine) 2325 battery. Standby battery life varies between 1 and 6 years depending on model, so I might as well leave the battery out as I really don't need to keep the data on the card for more than a few days (eg to transfer files to / from a PC).

    Regards,
    John

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