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TI Home » TI E2E Community » Support Forums » Data Converters » Audio Converters » Audio Converters Forum » PCM3052A handshake problems
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PCM3052A handshake problems

PCM3052A handshake problems

This question is not answered
Rob McPherson39737
Posted by Rob McPherson39737
on Jan 15 2010 13:15 PM
Prodigy40 points

Hi all.  I have a question about the pcm3052a codec.  I have it connected to an Atmel AT32UC3B0256, and I am generating the proper waveform for transmission to the codec, as viewed on my oscilloscope.  Here lies the problem:  Although I am sending the proper pattern, 32-bit alternating frame, 24-bit data, msb first, 1-bit delay, I am not seeing data relating to that on the output of the codec.  Even more, I have my inputs tied to 3.3V, through a 2.2uF input capacitor, and I just get zeros on the input transfers.

I am not using the i2c interface, although I have it enabled.  I am just using the codec in its default settings.

I am seriously considering changing over to a PCM3006 for my production units, but I need to get this going to test my prototypes.  I am new to I2S and codecs, so any hints and helps are much appreciated.

 

Rob

pcm3052a audio codec
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  • Rob McPherson39737
    Posted by Rob McPherson39737
    on Jan 18 2010 11:42 AM
    Prodigy40 points

    I have just gone through and measured voltage levels on all of the pins.   They all seem valid to me, with the following exceptions:

    I have L/!M tied to +5V instead of reading it as an output.

    VCOM shows 2.5V

    MBIAS shows 1.5V

    VRef1 shows 0.8V fluctuating +/- .03V

    VRef2 shows 5V

    !PWDN shows 5V

    Vdd shows 3.2V

    ADR & I2CEN are tied directly to 3.3V and show 3.3V

    Vcc1 shows 5V

    Vcc2 shows 5V

    Vcc3 shows 5V

    MINM & MINP = 0

    AGnd1,AGnd2, AGnd3 = 0

    Dgnd = 0

    SCKI = 11.3 MHz@3V (measured)

    I am able to see the data go over the Dout pin, the BCK pin, and the LRCK, and these seem to be valid.

    Please help me with this.

     

    Rob

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