ADAU1761 I2C access problem

Hello.

I tried the ADAU1761 EV Board with the USBi and it is working fine, however, when I tried to control the EVB via I2C by another simple 8-bit MCU, I have a problem, please see the picture, seems the I2C cycle cannot work to get the ACK bit from the DSP.

Interface voltage is 3.3V. I sent a RESET pulse to the board before starting the I2C command cycle. It cannot work even at the 1st cycle... no ACK read.

Any clue?

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thanks & regards,

manuel

Audio Signal Processors

SigmaDSP Audio Processors

adau1761