TAS6422-Q1: and DIR9001 - WARN pin asserted immediately and no sound!

Hi Peter,

Will you please send us the schematic of the signal chain you described above?  USB, DIR9001 and TAS6422?

Thank you.

Best, Tuan

Hi Tuan,

Thank you for the response. I am submitting the schematic for this circuit. Optical TOSlink => DIR9001 => TAS6422

I need to mention that I reworked the board:

  - (TAS6422) Now TEST pin(16) on TAS6422  is tied low to ground.

  - (TAS6422) I2C address pins now pulled low

  - (TAS6422) I2C SDA and SCL now pulled high w/ 4.7k resistor

  - (DIR9001) XTI pin now pulled to ground. No more oscillator

  - (DIR9001) PSCK[1:0] now both pulled to ground through 4.9k  resistor

  - (DIR9001) R252 removed and CKSEL pulled to ground

The scope photo shows:

yellow: warn pin

blue: PVDD and VBAT voltage input

green: PVDD and VBAT current input

Thank you for your time.

Best regards,

Peter

Hi Peter,

First you will need to use a TAS1020 to use PPC3. Or you can use an external I2C controller to talk to the TAS6422.

You will need to clear fault 0x21 80 before the warning pin LED goes out.

Let me know if this helps.

Best Regards,

Robert Clifton

Hi Robert,

Thank you for your response. Since I have both i2c address pins pulled low, I will be using device address 0xD4 to write. Register address is 0x21. Clear WARN is writing bit 7 high. I see that is under "miscellaneous controls 3 figure 70 + table 33".

You mention 0x21 80. Does '80' set bit 7 high and the rest low? How would that port over to the arduino or atmel studio environment language?

Also, I decided to hook up the TAS6422 EVM board I got. J12 is in place, and I supply 14.4 V. I have the USB cable hooked up, all three switches in the up position yet I have no option to connect on PPC3. It says TAS6422 Offline with no option to 'connect'. The green led is lit, as well as the orange warn light (on the eval board I'm talking about), and no connection option available. I don't think the board is functioning properly. 

Thank you for your time and help.

Best regards,
Peter

Hi Peter,

Actually the WARN pin is active-low. So while '80' will set bit 7 high, it actually sets high as well. I'm not sure how it would port over to arduino or atmel studio environment.

It sounds like you already have access to the TAS6422EVM software in PPC3? Is the USB-LOCK LED on?


Best Regards,

Robert Clifton

Hi Robert,

I was able to clear the WARN pin on my circuit, talking to the TAS6422 with an AVR micro processor. It still will not play music. Is the TAS6422 Non volatile? Do I have to reconfigure the chip at every start up? The WARN pin goes low every time I power up. I can shut it off using my AVR, and it stays off. But once I power off and on it comes back. Can I expect this for all the other registers?

To organize my questions:
1) Still will not play music, where should I look from here?
2) What configurations are volatile on TAS6422?


For my EVM eval board: I do have access to PPC3. USB-LOCK LED does not come on.

Jumper J12 is in place, tying PVDD and VBAT together. I apply 14.4 V to VIN. USB cable hooked up to laptop. optical cable is hooked up to active source as well.
I get the green 3.3 V light, and the yellow warn light. Standby and Mute switches are in up position. If I flip SPDIF button to up position, I get the Blue SPDIF light, and WARN light stays lit.

Never does the usb lock led come on.

If I remove the USB cable while there is power to pvdd, I get a fault light condition. If I then put standby switch to down position, the fault light gets brighter.

Thank you for your time.

Best regards,
Peter

Hi Peter,

I'm glad to hear that you've made some progress. Let me see if I can help you further.

1) Are you configuring the device? You'll need to use I2C to configure the device to the settings you want. You can actually use PPC3 with the EVM and record the I2C commands for how you set up the device.
2) Yes you will need to reconfigure the device every time you cut the power supplies.


Now for the EVM: Are you following the TAS6422EVM setup guide and still not getting the USB-LOCK LED to turn on?


Regards,

Robert Clifton

Hi Robert,

I have only cleared the WARN pin. I was under the impression it should pass sound by default. I'll start configuring it for sound according to the data sheet. I was also under the impression it could be set once and would hold. Do you know of any similar Class D amps from TI that are non volatile?

As for the EVM: I have followed the TAS6422EVM setup guide and the USB-LOCK LED does not turn on. I get green 3.3V, blue SPDIF, and yellow WARN.

Thank you for all your time with these issues. I really appreciate the guidance.

Best regards,
Peter

Hi Robert,

Sorry for second post but I wanted to update that I am now playing sound through my speakers. I am ok for now on my circuit, but if we could just resolve the issue with my EVM that would be perfect.

Thank you again with the help configuring the chip on my circuit.

Best regards,
Peter

Hi Robert,

The chip/circuit on my personal PCB is resolved and working. However the TAS6422Q1EVM is not working. The TI eval board. I don't get a USB LOCK LED. It will not connect to PPC3 no matter how close I follow the directions from the user guide.

Thank you for your time.
Best regards,
Peter

Hi Peter,
I'm closing this question, and please let us know if there is any more additional info and feel free to creat a new post in E2E if you have any other question.
Best regards,
Shawn Zheng