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FAQ:I am having trouble talking to the AIC23, could you please describe the IIC protocol using the Power Down Register as an example?

Answer:
You have to send three bytes for each command: 1)The IIC Address is the first byte. 2)The second byte consists of the Register address plus D8 of the data. 3)The D7-D0 of the data comprises the third byte. You must note in the Data Manual that the data is 9 bits long, which means the bit D8 of the data is bit DO of the Register Address. This is explained in Figure 3-2 of the AIC23 Data Manual. To write 0xFF to the PD Control Register you must write the following: 0x34 0x0C 0xFF As you notice, the PD Control Register address is address 0x06 but you have to send 0x0C since the first bit is carried over from the data.