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.
thanks & regards,