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TLV320DAC3100EVM control

John Gibbs1
Prodigy 70 points

I am wanting to splice the audio control lines from my proto board to the control lines on the TLV320DAC3100EVM demo board to replace the TAS1020B at U1. Has any one ever done this? Am I in for more work then I want to handle? Basically I am wanting an early start to the software design.

  • 0
    TI__Genius 9410 points

    Hello John,

    Yes this is possible and shouldn't be too difficult. Since I2C is open drain you won't need to disconnect the tas1020b from the DAC3100. I would start by wiring the I2C to tp1 and tp2.

    Please let me know if you end up running into any issues with this!

    Nate

  • 0 in reply to Nate Enos
    Prodigy 70 points

    Then I should also tack a wire on the TAS1020B reset pin to keep it quiet?

  • 0 in reply to John Gibbs1
    TI__Genius 9410 points

    John,

    Great question. The tas1020b doesn't support multimaster mode and it's only capable of being configured as a master so you will need to disconnect the I2C lines or hold the device in reset.

    How do you plan to get I2S to the DAC3100? If you hold the device in reset you will probably have to use an external clk and I2S source.

    Also, please note that you will still need usb to power the device even without using it for I2C or I2S.

    Please let me know if you have any additional questions,

    Nate

  • 0 in reply to Nate Enos
    Prodigy 70 points

    My ARM microcontroller has I2C and I2S. I want to wire both of them to the test points on the board. I think I2S is a cousin to I2C and I can treat it the same.

    The power suddenly looks interesting. The connector on the board looks like a mini-USB but it doesn't use a normal cable. Since I am wiring signals I'll have to wire the 5V too.