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TLV320AIC3100: MIC1LP related issues

Part Number: TLV320AIC3100

Two questions

1.What is the function of the input signal mic1lp transmitted to the DAC in the figure below?

2. If I only use sound input and speaker, can I only connect MIC1LP, MIC1LM,I2S interface,SPKP,SPKM.   Connect the interface in the figure below。The interface in the red box is not used