I am looking into designing a custom carrier board the ability to hook up an analog or digital (have not decided yet but would like the option of both) speaker and mic with the TX2 module without using USB. What is the easiest method to doing this? I noticed TX2 has a few I2S ports which I could use for the speaker and mic. I am guessing if I use an analog speaker I would need a chip with a DAC and amplifier such as the MAX98357B and for analog mic use an ADC.
But I also noticed the pins H4, G4 and D16 and E16 for DSPK and DMIC pins. How do I use these pins to hook up a digital speaker and a digital MIC. In the TX2 module datasheet, it says that DSPK will use I2S interface. Which I2S port will it be using? There are only two pins CLK and Data for each controller. Just would like some more information on these pins and how to integrate them with a mic and speaker. Thank you for your help.