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External audio codec interface with Pandaboard

hiteshgambhava
Intellectual 475 points
Other Parts Discussed in Thread: TWL6040, 4460

Hi,

I want to connect external audio codec to Pandaboard. But there is no any I2S signals available on external header of Panada board. So i decided

to use PCM signals. TPs are available on this signals on Panda board and also these are multiplex with McBSP3 signals.

Now PCM signals are connected with Audio Phonix IC TWL6040. If i want to use this signals then I need to power down the Audio IC or put it in Reset. As I can not put it

in reset because it uses common reset singal of panda board. So I have only one option is , Power down the Audio IC.B y putting  "AUDPWRON" signal in low mode Audio codec will go in power down.

Can anybody tell me that my thought and connection is right or not ?

Please see attached snap what connections I prepared. Please check and let me know my connection work or not ?

Thanks,

Hitesh Gambhava

  • 0
    TI__Expert 5515 points

    The lines going to the audio chip for communication are PDM, not PCM. It is slightly different. Check the TRM for the omap you are using.

    What comes to my mind is that if you are going to hack your HW anyway, you can use McBSP2 instead by removing 4 resistors and taking the lines from there. This way you can use McBSP2 to generate the I2S signals you need and continue using the audio chip.

    McBSP2 is connected to the FM part of the WiLink chip to generate I2S signals.

  • 0 in reply to Israel Cepeda
    Intellectual 475 points

    Hi Cepeda,

    I am using OMAP 4460 Pandaboard ES and in this revision they remove McBSP2 connection from FM.

    But I got another idea from suggestion. There are McBSP1 connections with WiLink chip for BT audio interface. On this line they added 0E resistor.

    I will remove it and use it for my application.

    Thanks for your suggestion.

    Regards,

    Hitesh Gambhava