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TUSB320: Failure in I2C detection

PAUL BLESSON
Prodigy 10 points

Part Number: TUSB320

We are currently using the TUSB320LAIRWB IC in our design and have implemented the connections as per the recommended schematic provided in the datasheet.

image.png

Note - The ADDR and PORT pins are configured with pull-up resistors, and the pull-down resistors are not populated.

During the Proof of Concept (PoC) testing phase, we are encountering an issue where the I2C communication is not being detected. 

We have ensured the following:

  • Connections have been made as per the reference schematic

  • Proper power supply is provided to the IC

  • Pull-up resistors are present on the SDA and SCL lines

  • The I2C master is functioning correctly with other devices

However, despite these checks, the device is not responding on the I2C bus.

We kindly request your support in reviewing this issue. Please let us know if there are any additional configuration requirements, initialization steps, or specific conditions that need to be met for enabling I2C communication with this IC.Screenshot 2026-03-31 175333.png

  • 0
    TI__Guru 52425 points

    Hi Paul,

    Have you tried both ADDR addresses or switching the PU/PD on the ADDR pin already?

    Can you ensure the TUSB320 is enabled by monitoring VCC, VBUS_DET, and the ID pin?

    What is the frequency for your I2C signaling?

    What is the status of the INT_N pin? PU or PD to ground?

    I would expect the TUSB320 to be working at this point so it's definitely a bit odd. As long as the ADDR pin is PU or PD, the TUSB320 should be in I2C mode. May also be good to ensure the SDA/SCL signaling is actually reaching the TUSB320.

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    TI__Guru 52425 points

    Hello,

    Closing thread due to inactivity. If you have any follow-up questions or concerns, feel free to reply.

    Thanks,

    Ryan