LM49350: Headphone detection

Sakthiyanandan,

The GPIO can be set to control the HP_ENB using bits 3:0 of register 0xE0.  depending on how you have the GPIO set up, you can set bits 3:0 to either 0011 or 0100.  

To control the amplifier just add a buffer to the HP detect circuit like in the image below:

The buffer could be inserting or non-inverting,  it just depends on the amplifier enable, the HP enable can be set as described above. 

Alternately a better way to do it would be to monitor the State of the GPIO can be polled, and an external processor can enable/disable the amplifier.  I say this is likely better as it is possible that when the HP plug is removed that there would be a brief moment where the input to the buffer would be negative and the buffer would need to be able to handle that.  

best regards, 

-Steve Wilson