I connected CS4270 to my ST32F446 nucleo board. Currently only I2C pins are connected, GND, AGND, all 3 power lines and address select pins. AD0,AD1 and AD2 are connected to GND. (the thing I don't understand is that datasheet says that 5 from 7 bits are foxed, so 3 address select pins don't make much sense to me.) Taking that to consideration I expect the device to be available under address 0x24, but I get NACT. I also tried I2C scanner without any success neither. I can't get any any communication to work with this IC.