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USB communication errors with ADAU1442

Hello,

I am having problems with USB communications errors with the ADAU1442. The first download works correctly, subsequent downloads occasionally work but more often than not fail. Occasionally a download appears ok but is corrupt in some way.

I have the SCK and SDA pins pulled high with 2k2 resistors to 3V3. The only other device on the I2C bus is the self boot memory. All traces are gaurded and signal integrity looks fine.

Suggestions please?

Cheers

Ian.

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  • Hi JeradL,

    This happens with my own hardware using the USBi to communicate from SigmaStudio. There is no micro controller attached to the I2C bus.

    Attached are two schematic sheets. The pull ups for SDA and SCL are on the CPLD sheet along with the programming interface.

    Regards

    Ian

    https://ez.analog.com/cfs-file/__key/communityserver-discussions-components-files/396/2524545a3021d7d49cf19571b395b43b.html

Reply
  • Hi JeradL,

    This happens with my own hardware using the USBi to communicate from SigmaStudio. There is no micro controller attached to the I2C bus.

    Attached are two schematic sheets. The pull ups for SDA and SCL are on the CPLD sheet along with the programming interface.

    Regards

    Ian

    https://ez.analog.com/cfs-file/__key/communityserver-discussions-components-files/396/2524545a3021d7d49cf19571b395b43b.html

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