ADAU1772, how should we deal with unused pins ?
Hi,
Please let me confirm below.
If we don't use following pins on the system, how should we deal with them ?
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
adau1772
Integrated/Special Purpose A/D Converters
Audio CODECs
Hello
博
For your question 1:
These pins can be left floating. However, it is a good idea to have them terminated and you certainly can use the internal weak pullup. If you need to have these terminated stronger than a weak pullup for extreme environments, then you can terminate these pins to IOVDD since these pins are only able to be configured as inputs.
Question 2:
Yes, leave them floating. It is also a good idea to disable them using the MIC_BIAS0_1 Control Register and still leave the pin floating.
Thanks,
Dave T
Hi Dave,
Thanks for your quick relply.
I clearly understood.
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