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TAS5414C - Cannot run load diagnoscits and switch from Hi-Z to Play mode

Artem Gromak
Prodigy 50 points
Other Parts Discussed in Thread: TAS5414

Hi.

Now we are trying to run TAS5414.  I2C work works correctly.

Power up sequence:

1. STANDBY pin to 1

2. Wait 1 ms

3. Reading register 0x00.  R0x00=0x00

4. Reading register 0x01.  R0x01=0x00

Load diagnostic section start.

5. Write to register 0x0B a value 0x0F

6. Wait 20 ms

7.  Read register 0x07 - R0x07 is always 0x0F.

What is wrong?

The same problem with play mode switching.

Рlay mode switching sequence:

1.  The device starts in hi-Z mode.  Write to register 0x0C a value of 0x10

2. Wait 50 ms

3.  Read register 0x06 - register 0x06 is always 0x00 - TAS5414 cannot switch to mute mode.


What is wrong? Where is my mistakу,

Thanks.

  • 0
    TI__Mastermind 37225 points

    Artem,

    I think you have the /MUTE pin connected incorrectly.  I have see it connected to a 3.3Vdc GPIO pin on a microcontroller.  If you have done this, then it will not be able to progress through the load diagnostics or get to MUTE mode.  The /MUTE pin only needs the 220nF capacitor to ground to function correctly.  It does not need to be pulled high or low to function.  The device is able to pull it high and low through I2C commands.

  • 0 in reply to Gregg Scott
    Prodigy 50 points

    >>I think you have the /MUTE pin connected incorrectly.  I have see it connected to a 3.3Vdc GPIO pin on a microcontroller.

    You're right. MUTE was connected to the output of the microcontroller. Microcontroller out to "1" (5 V).

    >>The /MUTE pin only needs the 220nF capacitor to ground to function correctly.

    Now I put uC output to Z-state (input) and connect MUTE to ground through capacitor 220nF.

    But still fails run load diagnostics and switch to PLAY mode.

  • 0 in reply to Artem Gromak
    TI__Mastermind 37225 points

    Artem,

    The uC must be disconnected from the MUTE pin.  In tri-state the uC will clamp it and not let it go to 6.8V as needed.  

  • 0 in reply to Gregg Scott
    Prodigy 50 points
    >>The uC must be disconnected from the MUTE pin.
    Now we disconnected uC from the MUTE pin. Diagnostics run complete. Switch to PLAY mode also work.
    Thank you very much, Gregg.