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Tomas Bengtsson
Tomas Bengtsson
Visitor II
May 15, 2018
Question

Undershoot tolerance at STM32F767IIT6

  • May 15, 2018
  • 2 replies
  • 754 views
Posted on May 15, 2018 at 15:10

  1. Does STM32F767IIT6 tolerate an undershoot of -0.8V lasting for 2ns at a 5V tolerant I/O?
    This topic has been closed for replies.

    2 replies

    T J
    T J
    Senior III
    May 15, 2018
    Posted on May 15, 2018 at 15:55

    maybe, only because the 2nS is not enough time to overheat anything.

    You could divert that energy by using a schottky diode from ground on that pin, clamping to -0.4v max

    AvaTar
    AvaTar
    Senior III
    May 15, 2018
    Posted on May 15, 2018 at 16:07

    maybe, only because the 2nS is not enough time to overheat anything.

    This depends on the actual circuitry 'behind the pin', I would be cautious.

    MOSFETs, for example, have a dV/dt limit. Exceeding that limit will kill it, without much energy involved (relative to it's total admissible power dissipation). I've seen FETs dying that way.

    I
    Imen.D
    ST Technical Moderator
    May 15, 2018
    Posted on May 15, 2018 at 15:57

    Hello

    tomas.bengtsson@prevas.se

    ,

    For the Input voltage on FT pins:VSS − 0.3V ; with maximum:VDD+4.0V

    For more details, please check therelated

    http://www.st.com/content/ccc/resource/technical/document/datasheet/group3/c5/37/9c/1d/a6/09/4e/1a/DM00273119/files/DM00273pdf/jcr:content/translations/en.DM00273pdf

    ,in the Table Voltage characteristics

    Noted that V

    IN

    maximum value must always be respected. You should refer to Table 16 for the values of the maximum allowed injected current.

    Best Regards,

    Imen.

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