TAS5558: TAS5558 no output

Yang,

Have you been able to play any audio or have you seen VALID HIGH in any mode/setting?

I see that you have both ASRCs configured for Left-Justified 16-bit. Are you sure you are using 16 bit?

Regards,

-Adam

Hello Adam,

No output and VALID is LOW when playing in any mode/setting.

When set D4=1(DAP automute Disable) in 0x04 System Control 2, The VALID is HIGH and PWM of TAS5558 output PWM(50/50), but no sound....and the PWM is not 384K . 

Once writing 00 to 0x12, all register values are restored to their default values.

I'm sure the input signal is 16bit left-justified, The playing 1KHz.

Best regards,

Yang

Yang,

Writing to 0x12 cannot clear your other register settings. I think something is wrong with your programming/readback.

Please let me know your complete TAS5558 register programming from RESET to when you expect audio to be playing. I will try it on my setup.

Regards,

-Adam

Hello Adam,

1,Reset -DUMP after reset.rtf

2,Writing 00 to 0x12

3,Writing 00-01-00-66 to 0xC4 (L-J 16bit)

4,Writing A0 to 0x03

5,Writing 00-00-00-48 to 0xD9

6,DUMP after setting.rtf

7,Writing  00 to 0x12  clear the register settings

8,DUMP end.rtf

There is a signal input during setup.

Best regards,

Yang

After Reset.rtfAfter setting.rtfend.rtf

Yang,

I don't see any issues in your dump after reset.

Following your steps in order, I get VALID HIGH after step (4). Do you not get the same?

I don't see any issues in your dump after setting.

I am still not sure what is causing your result in end.rtf, I don't see this behavior on my EVM.

Writing to 0x12 should not clear any registers. Why are you writing to 0x12 a second time?

Have you monitored your power supplies to ensure they are not causing a reset?

Do you have an EVM? Have you tried this on more than one board?

Please send me your schematic at adamsidelsky(at)ti(dot)com.

Regards,

-Adam