PCM1789-Q1: I2C Detection Issue

deepak upadhyay

Part Number: PCM1789-Q1

Hi Team,

We are using DAC PCM1789-Q1 in one of our design.

We are operating the DAC in I2C Mode , While testing we observed that when try to Detect device on U-Boot ,it does not Reply (NACK on I2C).

But On Kernal same I2C address Chip reply with proper acknowledgement.

Our main purpose is to put the DAC in MUTE mode at U-Boot level itself. So if There is no -way to detect the device on U-Boot Level.

Is there any other way to force the DAC in mute Mode Till software application is up?

Attaching the Schematic for reference.

over 6 years ago

0 Paul_Frost over 6 years ago

TI__Guru 53193 points

Hi Deepak,

The AMUTEI pin is a hardware controlled mute. You could connect that to a hardware controlled output pin and assert it low until the device is detected.

Thanks!
paul

0 deepak upadhyay over 6 years ago in reply to Paul_Frost

Prodigy 65 points

Hi Paul,

We tried that by connecting the AMUTEI pin to Low ,But Some Noise on Speaker is still there for few seconds ,

Thanks

0 Paul_Frost over 6 years ago in reply to deepak upadhyay

TI__Guru 53193 points

I am surprised that there would be noise for a few seconds - what hardware is driving the speakers? A good experiment would be to ground the output of the PCM and see if you still hear the noise. If you do, I suspect that you need to implement a startup procedure for the external amp.

Thanks!
Paul

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PCM1789-Q1: I2C Detection Issue