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ADAU1772, how should we deal with unused pins ?

Question asked by Paramecium on Nov 23, 2015
Latest reply on Nov 27, 2015 by Paramecium

Hi,

 

Please let me confirm below.

If we don't use following pins on the system, how should we deal with them ?

 

  1. 1. DMIC2_3/MP5 and DMIC0_1/MP4 pins

On the data sheet and reference board, these pins are floating.

When we don’t use these input pin, can we leave them floating ?

I can find following control register. Should we set these pad internal pull-up ?

 

ADAU1772 data sheet ( rev.C )

Page 108

Table 99. Bit Descriptions for PAD_CONTROL0

 

2 MICBIAS0 and MICBIAS pins

These pins are A_OUT, so I think that we can let them floating.

But I can find following control register. Should we set these pins disenable ?

 

page 87

Table 74. Bit Descriptions for MIC_BIAS

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