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TLV320AIC3262EVM-U: Asking for the AIC3262 ASI1 in, ASI2 output setting

SHH
Mastermind 30301 points
Part Number: TLV320AIC3262EVM-U

Hi Team,

customer has one project that is evaluating AIC3262 DIN/DOUT function. Please assist for the customer questions that we can duplicate the situation on the AIC3262 EVM.

 

Question:

Customer request that AIC3262 need to turn off the IN1/2/3/4/CM switch, and the AIC3262 still can do the ASI1 to ASI2. However, customer found that the DOUT2 will stop output data once turn off all the IN1/2/3/4/CM switch. Please refer to the following procedure for the issue. 

Here is the experiment on the AIC3262 EVM. 

  1. Use GDE to place the I2S1 to I2S2

         2. Execute Download and Run，then uses Codec Control to control the AIC3262EVM

3.  Set the ASI#2 BCLK/WCLK as output in the Digital Settings

 

4.We can measure the DOUT2 waveform that from ASI1 to ASI2 on the TP30 test point on the AIC3262EVM

 

5.If we turn off all the input switc, the DOUT2 will stop output data.BCLK2/WCLK2 still has the clock output

 

 

Could you please provide your comment why the DOUT2 stop output waveform after turn off all the switch?

 

Thanks,

SHH

 

  • 0
    TI__Guru 57800 points

    Hi, SHH,

    This seems to be a problem with the configuration of the device. Are you running Codec control software after downloading the miniDSP code from PPS into the device?. It is possible that the configuration of the device processing block is overwritten with the default configuration of codec control, hence, the DOUT2 seen corresponds to the ADC signal and not to the DOUT. Have you verified that the DIN1 data is sent through DOUT2 after configuring the device with PPS?. Is this the same behavior once codec control is executed?.

    You may try to use only the configuration code from PPS and disable all the input connections and set the digital interfaces by changing the register configuration on the system settings code of PPS. That way there would be no need to use codec control. Another option would be to open codec control, move to PPS and download the coefficients and then make the changes with codec control, that way the default configuration would be overwritten with the miniDSP code. 

    Regards,

    -Diego Meléndez López
    Audio Applications Engineer

  • 0 in reply to Diego Melendez
    TI__Mastermind 30301 points

    Hi Diego,

    I already test the following way before I post.

    Here are the way I test:

    1. Use PPS to config ASI1 to ASI2. Then only using Codec control to turn off the analog switch. >> it did not work.

    2. set the analog switch off on the system settings code of PPS and excute "download and run">> it did not work.

    Please refer to the .pfw file here. Can you please duplicate this issues and provide comment? thanks.

    here is the .pfw that already set the setting on the system setting of PPS.

    AIC3262_ASI2_0704.zip

    BR,

    SHH

  • 0 in reply to SHH
    TI__Guru 57800 points

    Hi, Scott,

    Thanks for the feedback. I tried this in my end and was able to replicate the issue.

    I made more tests and tracked down the problem to the ADC miniDSP, as neither DOUT1 or DOUT2 works when the inputs of the PGA are not connected; while the DAC's miniDSP is operating normally.

    Under this condition, flags which specify that the programmed  PGA gain is equal to gain applied in the device are not set (B0_P0_R36), which under different circumstances could mean that there is a problem on the PGA. This suggests that the miniDSP of the ADC is stopped when these flags are not set.

    This behavior seems normal as the device would expect that the ADC input stage is configured properly to start the miniDSP operation.  I am contacting my team to see if this is effectively an expected behavior for this device, I will let you know any update as soon as I get it.

    I don't see a problem with leaving the inputs connected to the PGA as there should be no impact on either power consumption or performance, do you know why customer wants to remove these connections?.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    TI__Mastermind 30301 points
    Hi Diego,
    customer has mixer on the PPS, so they would like to turn off the ADC input instead of set the mixer value to zero.
    Is this behavior expected? Please confirm. thanks for help.
    BR,
    SHH