pcm1802

esp32

https://tlfong01.blog/2020/01/28/pcm1802-reading-notes/

  SCK is System clock input
  PDW is Power-down control which is active low.
  LRCK is Sampling clock input and output
  FSY is Frame synchronous clock input and output
  BCK is Bit clock input and output

And DOUT is simply serial output.

https://www.pjrc.com/author/paul/