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TLV320AIC3204EVM-K:  TLV320AIC3204EVM-K：IIC communication issues

Luo Lu
Prodigy 220 points
Part Number: TLV320AIC3204EVM-K

Tool/software:

We use MCU to communicate with TLV320AIC3204EVM-K, and now we have a problem. We use logic analyzer to capture data and find that after powering up MCU and TLV320AIC320EVM-K respectively, MCU sends data to TLV320AIC320EVM-K through IIC. TLV320AIC3204EVM-K cannot receive data without doing any operation, but it can receive data and start working after repowering TLV320AIC320EVM-K. What is the reason? Could you help me answer it? Thank you.

Regards.

  • 0
    TI__Mastermind 29755 points

    Hi,

    The AIC3204EVM comes with the USB-MODEVM on which the I2C host is resided, how do you interface with the MCU?

    Regards.

  • 0 in reply to pdjuandi
    Prodigy 220 points

    Hi,

    The connection between MCU and AIC3204EVM, as shown in Figure:

    Regards.

  • 0 in reply to Luo Lu
    TI__Mastermind 29755 points

    Do you have the USB-MODEVM powered? The picture shows only the connection, but the USB port is not connected.

    If you don't need the USB-MODEVM, you can use just the EVM with your MCU.

    Regards.

  • 0 in reply to pdjuandi
    Prodigy 220 points

    I did not use USB-MODEVM, MCLK, WCLK, BCLK, SCL, SDA are all provided by MCU, and I can see that there is no problem in the data transmission of I2C with the logic analyzer. The problem is that I have to power up EVM again before I can receive data, how can I make EVM receive data directly after MCU sends data? Instead of receiving data after repowering. Please help me analyze and answer, thank you very much!

    Regards.

  • +1 in reply to Luo Lu
    TI__Mastermind 29755 points

    This sound like, some parts/ICs are not powered initially.

    As you can see in the schematic, some powers of the device are given by the USB-MODEVM.

    My suggestion is you either power the USB-MODEVM or remove it and just use the EVM with your MCU directly.

    Please ensure all powers are powered and stable with RST pin low during power up. Once powers are up and stable you can release RST pin.

  • 0 in reply to pdjuandi
    Prodigy 220 points

    I found the problem, EVM is powered by pin 3 and 5 of P23, MCU is powered on, EVM is not powered on, SDA and SCL only 2.5V, both sides are powered on SDA and SCL voltage back to 3.1V, so if EVM is powered on again, the voltage of SDA and SCL will change, back to 3.1V communication success, EVM starts to work, What's going on here?

  • 0 in reply to Luo Lu
    TI__Mastermind 29755 points

    That's what I said, there are power needed in the USB-MODEVM. Please look at my suggestion above.

    Regards.