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TAS5815: Distinguishing TDM Signal Channels When Using Multiple Devices

Ryu Yamashita
Genius 4915 points

Part Number: TAS5815

Hi team,

I am using two TAS5815 devices to drive four channels of full-range speakers and tweeters with separate signals.
I connected the two devices as described in 9.2.4 Advanced 2.1 System (Two TAS5815 Devices), but I couldn't figure out how to split the TDM signal per channel.
Is there any way to do this?
Is the following connection method possible?
Is it a specification that the TAS5815 only recognizes slots 1 and 2 in TDM format, and cannot receive individual audio data via a parallel connection from the HOST MCU's SDOUT as shown in the diagram below?

image.png

Best Regards,
Ryu.

  • +1
    TI__Mastermind 22480 points

    Hi Ryu,

    This connection method is possible. You will need to shift the I2S LSB for devices 2-4 using register 34 so that each device reads the correct slot. 

    I tried testing TDM4 with two devices on the TAS5815EVM by shifting the I2S LSB 64BCLKS on device 2 and it works properly. 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Genius 4915 points

    Hi Sebastian,

    Thank you for your reply.
    Could you please clarify one additional point?

    If the provided register settings can achieve something like TDM slot configuration, does this mean that even in a daisy chain configuration, setting the SDOUT of the first-stage IC as the DSP's upstream (by setting SDOUT_SEL in the SDOUT_SEL Register (Offset = 30h) [Reset = 04h] to 1) and adjusting the offset registers of the downstream ICs would enable 4-channel signal reception?
    Or will SDOUT only output the 2-channel signals recognized by the first-stage IC?

    Best Regards,
    Ryu.

  • +1 in reply to Ryu Yamashita
    TI__Mastermind 22480 points

    Hi Ryu,

    The first devices SDOUT will only output the 2 slots it's configured for. You need to use a shared TDM bus so each device reads the proper slots. 

    Regards,

    Sebastian