• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 113 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

Original question:

AM263P4-Q1: I2C_SDA Falling Edge to Fast

AM263P4-Q1: I2C Fall Edge

Mari Tsunoda
Expert 5726 points
Part Number: AM263P4-Q1


Tool/software:

Hi Team, 

Please check the related thread first for context.

My customer has a follow-up question. Is there any issues if the fall edge timing is too fast?

Best regards,

Mari Tsunoda

  • 0
    TI__Genius 12297 points

    Mari,

    There are a few issues that may come up if the falling edge timing is too fast:

    1. Signal integrity - sharp falling edge can cause ringing or under/overshoot
    2. I2C Spec violation - I2C is open-drain with controlled rise and fall times. Your customer must ensure they are not violating I2C specs.
    3. Receiver misinterpretation - I2C receiving device(s) may misinterpret bits if the edge rate is too fast

    You can avoid edges being too fast by using the proper pull-up resistor value on the I2C SDA/SCL nets (we recommend 4.7k). Another thing you can do is place series termination resistors near the controller to slow down edges that are too fast.

    Regards,

    Brennan