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Parallel master CC8531

Adul Rahman Che' Ros
Prodigy 90 points
Other Parts Discussed in Thread: CC8531

Hello.

I need to use 6 slave (using CC8531) and as I know this IC can have maximum 4 slave. 

So I would like to know, is it possible to use two master (cc8531) that have same audio source (from codec TLV320AI)?

I already tried to connect BCLK, WCLK, DOUT, SCL, SDA, and RESET pin from TLV320AC3101 (codec) to 2 master (CC8531). But it seems that audio came out from each slave have ripple noise.   

  • 0
    TI__Mastermind 21125 points

    Hi Adul, 

    Yes this should work. 
    A few things to note:
    - Only one CC85xx master can be clock master on the I2S bus and control the AIC device over I2C. The other needs to use the DSP generic audio device with external clock source.
    - The two masters needs to have a identical setup besides the audio device
    - The two masters should be timeslot aligned (see user guide)

    Not really sure what is causing the ripple noise, but the first point above can be a candidate for this. 

    REgards, 
    Kjetil

  • 0 in reply to Kjetil
    Prodigy 90 points

    Hi Kjetil, thanks for reply.

    Below are the connections from your explanations. Is it correct? Did I miss something?

     

    Also here is configuration for audio interface for master2:

    I will try this first and update result later. Thanks a lot

  • 0 in reply to Adul Rahman Che' Ros
    Prodigy 90 points

    Hi Kjetil, It's worked. Thank you so much

  • 0 in reply to Adul Rahman Che' Ros
    TI__Mastermind 21125 points

    Glad you got it to work. 

    Let me know if I can be of further assistance. 

    Regards, 
    Kjetil

  • 0 in reply to Kjetil
    Prodigy 90 points

    Hi Kjetil,

    Thank you for earlier advise but now I got a new problem.

    The problem is about RF antenna. I'm using pulse antenna at both master & slave. I found that if all antenna in vertical (90 degree) position, some RF signal will be lost. But if I put master 1 & slave 1 in vertical (90 degree) and master 2 & slave 2 in horizontal (0 degree), RF will not lost signal. 

    So I need to put both pulse antenna in perpendicular position ( X+Y plane or Y+Z plane or X+Z plane) right? Is there any solution or reference in hardware or software so all antenna will work in vertical position only (vertical / 90 degree)?

    Sorry on the lack of knowledge in the RF system.