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TCA9548A: Communication no longer possible after a short time

Daniel_Smith
Prodigy 20 points
Part Number: TCA9548A

Hello Together,

i am a evening student and have a Problem with a electronic circuit.  We use the TCA9548A and communicate with a 5V I2C from the master device.

The Problem is following: 

In the first Moment the circuit works, but after a short time the TCA9548A is not more working. the device ist "i think" broken. In the attachment I will deposit the wiring diagram and layout for you.

I do not remember where a mistake can be. I hope you can help me to solve the problem.

 

These is the Board Layout:

Theses is the circuit diagram:

  • 0
    TI__Guru 62920 points

    Hello Daniel,

    Does power cycling resolve the issue, or does the device seem to be permanently affected? What is going on in the system when the device stops working? And, what sort of behavior do you observe from the non-working device?

    Regards,

    Max

  • 0 in reply to Miguel Robertson
    Prodigy 20 points
    Hello Max,
    First, apologize for the little information.
    We can't address the device after the problem occurs.

    It becomes noticeable shortly before, if the device cannot be addressed for a short time and then it does not react at all.
    The power supply, which we use and which supplies the entire board, is the following: TSR-1-2450.
    With the TCA9548A we read out sensors, e.g. TC74 (temperature sensor circuit board), light sensors, etc.
    Once we have soldered the board and put it into operation, it works smoothly. After some time in operation, the TCA9548A can no longer be addressed and is defective in my opinion. Because it doesn't work even after restarting the system or disconnecting the power supply.
    Regards
    Daniel
  • 0 in reply to Daniel_Smith
    TI__Guru 62920 points

    Hi Daniel,

    Can you please observe the SDA and SCL control lines on an oscilloscope when the device cannot be addressed so that we can verify that it should be properly receiving its address and acknowledging?

    Thank you,
    Max

  • 0 in reply to Miguel Robertson
    TI__Guru 62920 points

    Hi Daniel,

    Have you had a chance to look into this further?  Or, have you found a solution?  If not, I still think it would be helpful to probe the SDA/SCL signals to verify they are behaving as expected.

    Regards,
    Max