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TOPIC: MCHStreamer TDM input from ICS-52000 MEMS Mics

MCHStreamer TDM input from ICS-52000 MEMS Mics 1 week 5 days ago #44371

  • alexmstahl
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I have connected an MCHStreamer to an Invensense TDM Microphone array demo board. (www.invensense.com/download-pdf/an-00009...ay-demo-board-guide/). It works very well!

Now, I am trying to connect the same MCHStreamer to four NotWired NW-AUD-ICS52000 boards .(www.notwired.co/datasheets/notwired/ds-nw-aud-ics52000.pdf). This board uses the same ICS-52000 and a very similar schematic. However it is not working properly. I just see low level crackling noise on the active channels.

I have compared the clocks and data signals, probing the MCHStreamer pins as well as the signals at the microphone chips. I have double-checked and rebuilt my connecting cables, using short leads and good grounding. I have yet to find any differences to explain why one board works and the other does not work. The TDM data stream looks similar, yet again with the Invensense board I hear good-quality audio and with the NW board, I just hear some noise.

My best guess is a timing skew on the SD net, just enough to invalidate the setup time requirement. But I have not been able to see this, just a guess.

Has anyone used the NW-AUD-ICS52000 boards successfully? Thanks in advance for any suggestions.
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