Question about the WM8731

[gai_man_de]

I am doing a project on the DE2 development and education board of Altera which contains the WM8731. After reading its datasheet, I see that the WM8731 supports a 2-wire MPU serial interface that is very similar with the I2C protocol (that have a start condition, a acknowledge bit, a stop bit...). So, why does it not be called the I2C interface in the WM8731 datasheet? Is there any difference? While, the WM8962 indicate 2-wire I2C and 3- or 4-wire SPI serial control interface clearly.
Now, I am very confuse. So I wish I will receive your answer as soon as possible. Thanks!

 

[bassa]

So, why does it not be called the I2C interface in the WM8731 datasheet?

WM8731 does not have a I2C interface, But it have I2S (I²S - Wikipedia, the free encyclopedia) interface, Search "I2S" in WM8731 datasheet to find more

 

[gai_man_de]

I know that, I2S is one of digital audio interfaces of WM8731, but my question is about 2-wire serial control mode, one of WM8731's software control interfaces. If you read DE2 user manual, A karaoke machine (page 64) you will see they told us that "the I2C interface is used to configure the Audio CODEC". I just confuse about 2-wire serial control mode and I2C interface

 

[bassa]

Since I2C interface is not mentioned in WM8731 datasheet (whatever reason) you may tryout it using I2C commands for 2-wire MPU serial interface mode.

 

[gai_man_de]

I used the I2C protocol to control the WM8731's interface and it worked properly. And I just want to make it clearer. Thanks any way!

 

[bassa]

May be they are not using I2C name in their datasheet. Anyway if it is working for I2C, that is fine