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TCA9517: TCA9517 Application

Part Number: TCA9517

Hello TI Buddy:

I met TCA9517 pin3 SDAA short issue.

Due to our product communication voltage is 1.8V, so,changed side A as slave and side B as master.

I am not sure whether it cause this type of failure.

Another, I reduced side A/B power 100nF decoupling capacitor.

Some good comment for my study.

Thanks again!

  • Hey SimonC,

    "I met TCA9517 pin3 SDAA short issue."

    Can you explain a bit more of what you mean by this? Are you saying the SDA/SCL lines are latching to a certain voltage? Or you are seeing a large amount of current going into our device?

    "I am not sure whether it cause this type of failure."

    Do you have any O-scope shots you can show us? Can you show us a picture of your schematic that way we can verify the set up is correct?

    "Due to our product communication voltage is 1.8V, so,changed side A as slave and side B as master."

    A block diagram of your set up will help us get a better picture.

    "Some good comment for my study."

    -I need a bit more information to go on, please see my questions above.

    Thanks,

    -Bobby

  • Hello Bobby:

    Sorry for the confusing! Placed my answer as below.

    "I met TCA9517 pin3 SDAA short issue."

    Can you explain a bit more of what you mean by this? Are you saying the SDA/SCL lines are latching to a certain voltage? Or you are seeing a large amount of current going into our device?

    [SimonC] Did measuring pin SDAA was short in the real application. I am not sure what reasons cause it. This failure often happen on our line.

    "I am not sure whether it cause this type of failure."

    Do you have any O-scope shots you can show us? Can you show us a picture of your schematic that way we can verify the set up is correct?

    [SimonC] Sorry! I could not attached SCH file. Maybe, you can release mail address for further communication.

    "Due to our product communication voltage is 1.8V, so,changed side A as slave and side B as master."

    A block diagram of your set up will help us get a better picture.

    "Some good comment for my study."

    -I need a bit more information to go on, please see my questions above.

  • Hey SimonC,

    "[SimonC] Sorry! I could not attached SCH file. Maybe, you can release mail address for further communication."

    A high level block diagram could also work if you can't upload a schematic but if you would prefer to take the discussion offline we can do so. You can reach me at duynguyen@ti.com

    Note: I may not get to your email today but should be able to take a look at it by the beginning of next week.

    Thanks,

    -Bobby