• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 196 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.

TPS23882: MSP430 + TPS23882 I2C rise time

Jimmy Lai
Expert 6845 points
Part Number: TPS23882

Dear Team,

 

Currently we are doing I2C SI test, we found SCL rising time fail.

 

We use pull up 4.7k ohm for i2c interface , SCL probe point close to PSE, the rise time result is 1ns not meet TPS23882 spec.

 

We also try to change PU to 10k ohm, rise time result is 3ns, still can’t meet.

Do you any suggestion about this or do you know how to setup I2C fast mode or standard mode of the MCU?

 

Many Thanks,

Jimmy

 

 

 

  • 0
    TI__Mastermind 21320 points

    Hey Jimmy, 

    let me dig into this more and reply in a few days. 

  • 0 in reply to Michael Pahl
    TI__Mastermind 21320 points

    Hey Jimmy, 

    Thank you for being patient with us. 

    As I am reviewing the clock signal, there is a limited amount of hardware between the MCU and the PSE. You already tried changing the resistors, which was a great debug step. The only other component between the MCU and the PSE is the digital isolator. I would suggest we check the clock signal on the input and output of this component. If the clock signal is too slow going into it, that would point me to the MCU. If the clock signal is slowed down because of the isolator, then maybe it is the isolator itself, maybe a layout issue, or we can look at other components. 

    If the clock is too slow from the MCU, I would suggest checking with the MCU team. Our SW support is very limited at this time, so you should get a faster response from this team. 

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments