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A
a3b
Visitor II
February 23, 2004
Question

I2C BUS SPEED

  • February 23, 2004
  • 3 replies
  • 752 views
Posted on February 23, 2004 at 13:31

I2C BUS SPEED

    This topic has been closed for replies.

    3 replies

    A
    a3bAuthor
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:58

    On a particular design, I have componants with different Bitrate under i2C such as:

    1 24C02 E2PROM at 400 KHz,

    2 X UPSD up to 750 KHZ using 24 Mhz XTal,

    1 DS1307 Clock at 100 Khz.

    does anybody know this:

    Can I use different bitrates : 750 Khz to communicate between UPSD, 400 KHz from upsd to E2PROM, 100 Khz from UPSD to Clock ?

    Or am I obliged to run at minimum speed 100 KHz ?
    S
    sjo
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:58

    You will have to comply with the minimum speed device, eg. 100KHz.

    I2C devices are only upwardly compatible.

    A possible solution is bridging - have a look at the latest I2C spec which mentions this.

    Regards

    sjo

    [ This message was edited by: sjo on 23-02-2004 17:44 ]
    A
    a3bAuthor
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:58

    Thank you for your answer.

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