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Original question:

TAS6424Q1EVM: Can I use the EVMBoard as an I2C Master to program several Amps

TAS6424Q1EVM: Adressing the Evaluation Board over I2C interface (J7)

Alex.an.der.H
Prodigy 20 points
Part Number: TAS6424Q1EVM
Other Parts Discussed in Thread: TAS6424-Q1, TAS6424

Dear TI-Team and Community,

I am fairly new to the world of ICs but I want to realize a certain setup which includes the TAS6424Q1EVM.
The EVM should be used as a slave, getting data over the I2C interface (or I2S, which is more suitable for Audio), while the I2C (or I2S) interface of an other element in the setup is connected to the bord. The other element is not designed/produced by TI.
So my question is if the desired setup is possible, and how to tell the EVM that all the input comes over I2C (or I2S). Is PPC3 the right software to do this?
Thank you for your support.

  • 0
    TI__Mastermind 45085 points

    Hello Alexander,

    Your understanding is correct. 

    If you wish to insert an I2S signal from another source on the TAS6424-Q1 EVM, it is easy, but some resistor removal is necessary.  You will notice on the PCB there are four headers labeled MCLK, SCLK, LRCLK, and SDIN.  You can insert your external signals into these headers.  Notice that one pin of the header is ground so that the clocks have a good return path to your source.  Next to these four headers are four resistors that need to be removed.  R42, R43, R44 and R48.  The EVM will not be able to support an external source while the USB connection to the laptop can be used to control the I2C for the device.

  • 0 in reply to Gregg Scott
    Prodigy 20 points

    Hello Gregg,

    thank you for your quick reply. The other device has a little different I2S setup. There is BCLK (which should equal the SCLK), SYNC (which should be the same as Frame Sync (FS), which equals Word Select (WS) Signal), and four additional pins (which are DTX0, DTX1, DRX0 and DRX1). Obviously these are the data lines (SD) corresponding to the TI nomenclature on the TAS6424 SDIN1 (and SDIN2. and SAOUT?), (both SDIN2 and SAOUT are not pre-equipped with pins). On the TI bord an other connector (the MCLK) is available, whereby it is usually 256 * FS.

    When connecting the both boards, how do I handle the following contradictions: Do I need to connect the MCLK Pin, as it is just a multiplied value, of a value which is already given (FS)? What about the Data Lines? Is it sufficient to connect the DTX0 and the SDIN1 (I am not yet sure, whether I can tell the sending device that only the first Data Output must be used.)?

    Beside soldering the resistances off the board, is there any other hardware change needed? Questions upon questions. Thanks again for the support!
    Kind regards

  • 0 in reply to Alex.an.der.H
    TI__Mastermind 45085 points
    Alexander,
    The SAOUT is not used, so it can be ignored.
    SDIN2 is in parallel with the SDIN1 by default. Remove a zero ohm resistor R5 and add a header to the SDIN2 input. Now SDIN2 is a separate input from SDIN1.