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PCM6020-Q1: IIR filter coefficients default value

Shinji Tsuji
Genius 12378 points
Part Number: PCM6020-Q1

Hi team,

I found the default value of following resistor is different from the default datasheet value. 

Could you check if my reading value is correct or not?

P4_R72-R75 = 0x7FE648C6 (default : 0x7FFFFFFF)
P4_R76-R79 = 0x8019B73A (default : 0x00000000)
P4_R80-R83 = 0x7FCC918B (default : 0x00000000)

regards,

  • 0
    TI__Mastermind 23050 points

    Hi Shinji,

    Your readings are not the default values. It is is possible that if you read these registers prior to the required 10ms delay after wakeup that you could read non-default values as the device initializes. Otherwise I would suspect that your coefficients have been updated from default values somewhere in your sequence.

    Best,

    Zak

  • 0 in reply to Zak Kaye
    TI__Genius 12378 points

    Hi Zak,

    I wait enough long (>>10ms) time to read the register and there is no command to overwrite this register.

    Could you double check the default value of this register?

    (I checked 3pcs of samples and all of them shows same value.)

    The device is PCM6020-Q1

    regards,

  • +1 in reply to Shinji Tsuji
    TI__Mastermind 23050 points

    Hi Shinji,

    I read default values for the HPF coefficients from an EVM so I am not sure why you would read non-default values unless there is a problem with the device initialization or the registers are being set to non-default values.

    Best,

    Zak