• State TI Thinks Resolved
  • Replies 5 replies
  • Answers 3 answers
  • Subscribers 31 subscribers
  • Views 116 views
  • Users 0 members are here
Support feedback
Options
Options
Related

TMP75: standard mode timing reuquirement

Manu Chang
Intellectual 2040 points
Part Number: TMP75


Tool/software:

Hi expert,

When using TMP75 in standard mode I2C, customers tested that the SDA_rise time is 731.5ns/SCL_rise time is 771ns/SDA_hold time is 2.687us. All these 3 are beyond the range listed in timing requirements of fast mode in the datasheet. While these parameters fulfill the standard mode requirement in I2C standard. So my customers would like to confirm if these parameters are ok under I2C standard mode when using TMP75?

 

BR,

Manu

  • 0
    TI__Genius 10020 points

    Hello Manu,

    There's no issue with violating hold time max as long as other parameters are not violated, (such as setup time for the next clock.) Violating hold time min will cause TMP75 to malfunction.

    Best Regards,

    Meredith McKean

  • 0 in reply to Meredith McKean
    TI__Intellectual 2040 points

    Hi Meredith, 

    There is no data for the standard mode timing requirements in datasheet. If customers are going to use this in standard mode, which timing requirements should they follow? The I2C standard? 

    Like I stated before, not only the hold time, but the rise time is above the max value in datasheet in fast mode, which made customers confused how to use in standard mode. 

    Besides, if there is no issue, why do we list the max hold time in datasheet, what does this parameter actually mean?

    Meredith McKean said:
    There's no issue with violating hold time max as long as other parameters are not violated,

    BR,

    Manu

  • 0 in reply to Manu Chang
    TI__Genius 10020 points

    Hello Manu,

    Data max hold time can go over. Max clock Rise Time and Data Rise Fall Time can go over. If Rise and fall time are too slow, it will affect hold and setup times.

    Best Regards,

    Meredith McKean

  • 0 in reply to Meredith McKean
    TI__Intellectual 2040 points

    Hi Meredith, 

    Thanks for the reply, so can I understand this that as long as the customers' rise and fall time follow the I2C standard mode's standard, it will not affect the hold and setup time as well as the communication? Since that we don't have any data references in standard mode in datasheet. 

    BR,

    Manu

  • 0 in reply to Manu Chang
    TI__Genius 10020 points

    Hello Manu,

    TMP75 follows I2C standard mode's standard.

    Best Regards,

    Meredith McKean