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PCM1792A: PCM1792a SPI work in Daisy chain ?

philippe douillard
Prodigy 40 points
Part Number: PCM1792A
Other Parts Discussed in Thread: PGA2320

Hi,

I have a project to develop an audio DAC board with 4 PCM1792a and need to interface with SPI.

My question is if SPI work in daisy chain like PGA2320 for example or do we have to interface the SPI in paralel with independent chip select?

I dont want to use the TDMCA but I2S+SPI

Thank for your help

  • 0
    TI__Guru 53633 points
    Hi Phillippe,

    If you are using TDMCA, the SPI interface cannot be used at all. The commands to the device must be integrated into the TDMCA frame. TDMCA can be daisy chained.

    Thanks,
    Paul
  • 0 in reply to Paul_Frost
    Prodigy 40 points

    Hi Paul,

    As I said I don't want to use TDMCA

    I want ti use I2S and SPI independently and my question is to know if I can connect the SPI in daisy chain because I have four PCM1792a to interface.

    Thanks

  • 0 in reply to Paul_Frost
    Prodigy 40 points
    Hi Paul,

    As I said I don't want to use TDMCA

    I want ti use only I2S and SPI independently and my question is to know if I can connect the SPI in daisy chain because I have four PCM1792a to interface with the micro controler. I don't want to use 4 chip select but only one with daisy chain in place to parallel connection.

    Is my inquiry is clear?

    Thanks
  • 0 in reply to philippe douillard
    TI__Guru 53633 points
    Ahhh, my mistake! I read your question initially as "I want to use TDMCA" :)

    So the PCM1792A does not support daisy-chaining for SPI, so you will need to have a dedicated CS for each device if you want to write unique data to each device. If you are writing the same data to all 4 devices, then you can have them share an CS line, and just not have readback capability.

    Thanks,
    Paul
  • 0 in reply to Paul_Frost
    Prodigy 40 points
    Ok Paul,

    Your answer is very clear and now I understand.
    Thank a lot for your prompt support.

    I appreciate