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TMS320C5545: Microphone array to connect to the TMS320C5545 booster pack

Part Number: TMS320C5545

Hi,

I have a follow-up question related to my previous post.  I have looked at the TI Design reference TIDEP-0083 and it fits what I want to test.  I noticed that in the document they state that we can use 4 microphones with the C5517 and 2 microphones with the C5545.  I was under the understanding that the C5545 supported four microphones. Is there a reason why the document states only two? Is this because there is already a microphone plus a "line in" connector on the TMS320C5545 booster pack so only two more are left?  If so could I disable these to use all four microphones from the microphone array?

Finally, could I use a circular microphone array from another vendor with four microphones as long as I have I2C and I2S interfaces?  Will that be a lot more effort to integrate with the SW provided with the TIDEP-0083?

Thanks in advance,

Charles