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frederic239955
Visitor II
June 27, 2003
Question

ST92F150 electrical characteristics - I2C

  • June 27, 2003
  • 4 replies
  • 814 views
Posted on June 27, 2003 at 09:47

ST92F150 electrical characteristics - I2C

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    4 replies

    F
    frederic239955Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:34

    Hi,

    I have some problems with ST92F150 electrical characteristics for IOs Schmitt trigger (vih,vil,hyst), especially for I2C.

    For me, Hyst = Vih - Vil, but ST9 specs do not fit with this equation.

    Could anyone clarify this point ?

    I want to drive a 3.3V ST I2C EEPROM using ST92F150 (5V) and I need to know how to connect components . Are external pull-ups to 3.3V only required ?

    (Is ST92F150 I2C peripheral compatible with 3.3V parts ?)

    Thanks
    S
    sjo
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:34

    Have alook at the phillips I2C bus spec, it gives you info about level translation at the end of the doc using fets.

    I have attached if you do not have it.

    Regards

    Spen
    F
    frederic239955Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:34

    Spen,

    Thanks for the I2C specs.

    But my question is more simple :

    Is ST92F150 (5V) work with 3.3V devices with only 3.3V pull-ups on SDA and SCL lines ?

    fred.
    F
    frederic239955Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:34

    Spen,

    I found information I need in I2C specs you sent me.

    Thanks.

    Fred.

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