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USB communication errors with ADAU1442


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?



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