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tsilvan
Visitor II
July 15, 2003
Question

ST10F269: internal RAM preservation with +5Vdc?

  • July 15, 2003
  • 2 replies
  • 694 views
Posted on July 15, 2003 at 11:35

ST10F269: internal RAM preservation with +5Vdc?

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    2 replies

    T
    tsilvanAuthor
    Visitor II
    July 14, 2003
    Posted on July 14, 2003 at 12:53

    The datasheet, chapter 19 - power reduction modes, says to keep Vdd=+5Vdc during power down to preserve the internal RAM! I have never seen an 5V battery (typicall is 3V6). Suggestions how to get 5Vdc? Should I get it from 3V6 battery (by rising up to +5Vdc) with an additional chip or how?

    M
    maxime2399
    Visitor II
    July 15, 2003
    Posted on July 15, 2003 at 11:35

    The ST10F269 has not been done to use a battery to preserve the RAM contents. By power saving mode, ST means reduced current consumption and not voltage.

    In order to achieve the function you are talking about I recommend to use an external battery maintained RAM device like ST ZEROPOWER NVRAM that are available with the snap-on battery.

    look at this page:

    http://eu.st.com/stonline/prodpres/memory/nvram/nv_idx.htm

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