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TUSB320: I2C interface debug and validation

Andrew Zeiler4
Prodigy 10 points
Part Number: TUSB320

Hello,

In my design using the TUSB320, I am running into problems getting a response from the device through I2C.  After checking that ADDR is pulled high and my address is correct (0x61), I still can't get an ack from the IC.  I measured the SCK and SDA timing, and the only parameter I found out of spec was the data valid time and data valid acknowledge time (DS Page 7), both of which are specified at a maximum of 0.9ns, and my current application weighs in at >300ns.  Are these hard maximum values for the I2C interface, and what would be the failure mode of exceeding them?

Thanks

Andrew

  • 0
    TI__Genius 16150 points
    Hi Andrew,

    As you mentioned the data valid acknowledge time is max=0.9ns, if this time is exceed the time out will be completed and the communication won't be accomplished. Please try adjusting this value to meet the time spec and let us know your results.

    Best Regards,
    Luis Omar Moran
    High Speed Interface
    SWAT Team