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CCS/TLV320AIC3256: TLV320AIC3256

Part Number: TLV320AIC3256

Tool/software: Code Composer Studio

Hi 

I'm working with the TLV320AIC3256EVM-U and the PurePath Studio for its programing. 

I could program and work with the LINE INPUT, USB - Audio EVM through the component inputs, DEC1,2,..., I2S-IN, MONOI2S and MONO DEC. 
Always from the PC or from some device through the Line Input; but; I can't introduce any sound from the Microphone Input. I used microphones 
from the headset, electrelect, semi profesional but nothing occurs. 

Could someone of the colleagues borrow me a schematic in .pfw to try or give me clue about what it's occurring. 

Looking forward to hearing from you soon, best regards

Daniel 

  • In reply to Diego Melendez:

    Hola Diego; Feliz Año Nuevo!!!

    Regarding about the mic problems, it's sure it would be produced by the low biasing in the AIC3256; could you Please give us directions how to change the register R51 to deliver 2.5 volts as bias?

    Best regards

    Daniel Alayon

  • In reply to Daniel Alayon:

    Hola Daniel,

    In order to configure the micbias of the 'AIC3256 as 2.5V, Page 1: Register 51 bits D5 and D4 should be set to "11".

    2.5V will be the micbias voltage with this configuration as long as the full Chip Common mode is set as 0.9V (Page 1: Register 10, Bit D6).

    Feliz año!

    Best Regards

      -Diego Meléndez López
       Audio Applications Engineer

  • In reply to Diego Melendez:

    Hi Diego, same for you!!!

    Then in Register 51, Page 1 it would be filled with 0x30 and for Register 10 at Page 1 it would be 0x40, that's right?

    Regards

    Daniel Alayon

  • In reply to Daniel Alayon:

    Hola Daniel,

    For register 51, 0x30 will set the micbias as 2.5V, however, you also need to turn micbias ON. So the correct value to turn micbias ON and set it as 2.5V for Page 1: Register 51 is 0x70. Please note that this assumes that micbias is generated from AVDD (bit D3 = 0).

    Page 1: Register 10, Bit D6 should be 0 to set the common mode voltage as 0.9V, so the correct value should be 0x00

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • In reply to Diego Melendez:

    Hola Diego

    A lot of thanks Amigo

    Best regards

    Daniel Alayon

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