• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 29 subscribers
  • Views 327 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

zero flag of pcm1681

jinghui shi
Prodigy 20 points
Other Parts Discussed in Thread: PCM1681

Now I'm using a pcm1681 to program, but I don't know how to use the zero flag and the corresponding out put pin. If I don't read the register14, what would happen if zero status is detected, any bad thing happens?

Addtition: Normally, the sound output from the R channel(this is correct), but after some operation, sound outputs from both L and R channels(this is wrong), and this  appearance does not appear easily, I don't know why.

If the SCK, RLCK, and BCK miss synchronizing for some clocks but resynchronize later, what will happen?

I hope I will get some advise or answer here.

Thanks very much!

Jinghui.Shi

  • 0
    TI__Guru**** 189399 points

    Hi, Shi,

    The zero flag is just a feedback option. Nothing bad will happen if you don't read this bit. It is used for things like muting the downstream amplifier to give you better SNR ratings.

    I am at a loss why you would see data out of both L&R if you're just driving I2S data on the R channel. 

    If you lose the clocks, there will be some transient (pop) at the outputs, but once the clocks return, the part should re-sync and continue converting.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 20 points

    Yesterday, I got some new info: 

    1. When the apearance(R channel sound outputs to both L&R channels) apears, if the DA chip was reset(send command 0x80 to register(0x0A) of pcm1681), the system becomes OK again.

    2.  The problem(R channel sound outputs to both L&R channels) becomes more frequently when the temperature of the audio board(which contains pcm1681 chip) becomes higher.

    3. Now we only find this problem when the chip works on 192Khz.

    I hope I will get some option.

    Thank you!

    Jinghui.Shi