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mnardiello9
Visitor II
November 3, 2004
Question

F262: LVD and Vdd rise time

  • November 3, 2004
  • 2 replies
  • 729 views
Posted on November 03, 2004 at 05:42

F262: LVD and Vdd rise time

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    2 replies

    M
    mnardiello9Author
    Visitor II
    October 27, 2004
    Posted on October 27, 2004 at 15:07

    I have a big doubt with the LVD specifications for the ST72F262:

    In a former datasheet (Dec. 2003) I found that LVD works with Vdd max. rise time of 100ms/V; now the new release of the datasheet states that max. rise time is 20ms/V.

    We have 900 boards already assembled, and Vdd rise time is 40ms/V: is it still a safe value for the LVD to work properly ? Can anybody explain what could happen internally if the rise time is too slow ?

    We have only a 100nF capacitor between Reset and GND, no pullup resistor.

    Thank you
    I
    itsmejatinus
    Visitor II
    November 3, 2004
    Posted on November 03, 2004 at 05:42

    Yes, it was an error in the datasheet(100ms/V). Actually it was 100ms/5Volt => 20ms/V. I think with 40ms/V, the functioning may not be guaranted but should be ok if you do not use pull up on reset.

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