• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 196 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCA9617B: VOL and VILc questions on TCA9617B/TCA9517A/TCA9509

Ann_Lien
Genius 11870 points
Part Number: TCA9617B
Other Parts Discussed in Thread: TCA9517A, TCA9509,

Hello expert,

My customer use IBIS model to simulate the TCA9617B/TCA9517A/TCA9509 performance and found out low voltage level has some questions. They saw around 30~40mV for the low voltage on I2C SDA/SCLK signal. But based on datasheet, the VOL and VILc low band is shown below, which does not match the datasheet table. Could we know if this table value has other meaning or the IBIS model has some issue? Thanks a lot!

Best regards,

Ann Lien

  • 0
    TI__Mastermind 29183 points

    Hi Ann,

    Do we have an image of the customer model setup? Are we sure that the customer was not measuring the A-side voltage instead of the B-side voltage? I am not too familiar with this IBIS model, but would like to know how the customer setup their tests. 

    VILC and VOL are different electrical specifications. Vol is the output low voltage seen at a pin if driving from the other side. The VILC (input low contention voltage) is the voltage output required by all slave devices connected on that side in order to pass a low during a contention situation ultimately preventing the I2C bus from locking up. 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    TI__Genius 11870 points

    Hello Tyler,

    I will try to ask the setup for you. Do you mean that the VILC is the high band when the bus contention occurs and all slave will stop the signal when they see the low voltage is over VILC? Thanks!

    Best regards,

    Ann Lien

  • 0 in reply to Ann_Lien
    TI__Genius 11870 points

    Hello Tyler,

    I send the model capture for you via mail, please kindly check and let us know what we can do for the further steps. Thanks!

    Best regards,

    Ann Lien

  • 0 in reply to Ann_Lien
    TI__Mastermind 29183 points

    Hi Ann,

    I will answer both of these questions in the email. Closing the thread now.

    Regards,

    Tyler