DRA77P: PDM input capability?

AClemotte

Part Number: DRA77P

Hi,

I'm wondering if the DRA77P is able to receive data from 2 MIC MEMS with PDM modulation, like the ST MP34DT05TR-A or TDK INMP621ACEZ-R7 through its MCASP interface.

Regards,

over 5 years ago

0 Misael Lopez Cruz over 5 years ago

TI__Genius 9085 points

PDM audio can be captured with McASP. But our SDKs don't have readily available software to demodulate PDM data.

0 AClemotte over 5 years ago in reply to Misael Lopez Cruz

Expert 1060 points

OK, I understand. Can you tell me the modulation techniques supported by the SW?

0 Misael Lopez Cruz over 5 years ago in reply to AClemotte

TI__Genius 9085 points

As mentioned in my previous post, we don't have available software for PDM demodulation.

0 AClemotte over 5 years ago in reply to Misael Lopez Cruz

Expert 1060 points

I understand you previous post (there is not a SW available for PDM). As I need to select a digital microphone, I would like to know what type of output the sensor should have so that it can be read by the DRA. Thanks to your previous post I know it shouldn't be PDM, but I would also like to know what it can be.

Regards,

0 Misael Lopez Cruz over 5 years ago in reply to AClemotte

TI__Genius 9085 points

The interfaces that our SDK drivers support are I2S and TDM (depending on the OS) with different clock polarities, frame sync duration, data delay, etc.

0 AClemotte over 5 years ago in reply to Misael Lopez Cruz

Expert 1060 points

Ok I understand. We are doing the development with Android, in this case what demodulation is available?

0 Misael Lopez Cruz over 5 years ago in reply to AClemotte

TI__Genius 9085 points

I'm not aware of any demodulation available in the Android audio stack.

The McASP Linux/Android driver supports the following formats: I2S, DSP A, DSP B, left justified, right justified.

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DRA77P: PDM input capability?