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PCM5121: no output of PCM5121

Wiky Liao
Intellectual 1810 points
Part Number: PCM5121

Hi Team,

We try to use PCM5121 in our system. PCM5121 is set by slave mode, it is controlled by a BT module, and BCK=3.072MHz, LRCK=48KHz, data sample length=16bit. but there is no any output of PCM5121, we suspect the setup code maybe wrong. Below is our code, could you help to check if it is ok? thanks.

W 98 00 00   #select page0                                                 

W 98 3B 66   #mute                                                

W 98 3C 01   #right volume follow left settings                                           

W 98 3D 4F   #left digital volume                                                      

W 98 3E 4F   #right digital volume(omit?)                                                     

W 98 3F BB   # set vol changes for every 4 samples, 0.5 sample steps.                                            

       

W 98 20 00             # R20 P=1                                

W 98 21 0x10         # R21 J=16                               

W 98 24 0x01       # R24，R=2                                           

W 98 41 0x01       # R41，                        1 bck offset.                       

W 98 13 0x10       # R13，                        selectt BCK        

W 98 14 0x10       # R14，                        selectt PLL                                                                

W 98 27 0x02       # R27，                        set dsp  clock

W 98 28 0x10       # R28，                        selectt dac clock             

W 98 29 0x02       # R29，                        selectt ncp clock                                                                                                             

W 98 30 0x08       # R30，                        selectt dosr clock                                                                                                                              

W 98 04 0x01       # R04，                        pll enable

best regards.

Wiky

  • 0
    TI__Guru 53633 points
    Hi Wiky,

    The first volume commands look correct, though you are attenuating the output by default, have you checked with an oscilloscope to confirm there is no signal? Maybe try setting the volume to 0dBFS to start.

    This may be a typo, but when you start setting the PLL Register you are switching between decimal and hexidecimal for your register address. For instance:
    'W 98 24 0x01 # R24，R=2'
    Register 24 is 0x18, could this be the source of the problem?

    Thanks!