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TAS5756M: base configuration setup fail

Benn2017
Prodigy 50 points
Part Number: TAS5756M

with PurePath_Console2_2.1_r35934,  TAS5756M PBTL mode, hybrid flow 4, dump the .h file of base configuration. settings as below of ppc2.

1. hybrid flow 4

2. dump .h file

copy the cfg_registers[] generated .h file to mcu code, and add the exit standby code at the end of cfg_registers[], download to mcu and run, but SPK+/- output voltage is same as PVDD voltage, and check the signal by oscilloscope, no pwm waveform output on SPK+/-.

check the timing of i2c, it is ok. 

whether the base configuration file need use the .cfg output?

  • 0
    TI__Guru 57800 points

    Hi, Benn,

    Few considerations must be taken. Dump file feature reads the register data from the amplifier, so you need to run and stop the HybridFlow to get the coefficients loaded into the amplifier. Having the output voltage equal to PVDD is not a normal behavior, so it is possible that there is an issue with the amp. This device is able to start streaming audio once  power supplies are stable and valid I²S clocks are provided, without the need of configuring any register. Could you please check the behavior of the TAS5756M under these conditions?.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Prodigy 50 points
    HI, Diego
    the console M/B is different with the picture on SLOU366.pdf on my hand, there are white 10 pin PIN HEADER below the coaxial connector. and the left 5 pins are GND, and the right 5 pins are MCK/BCLK/LRCK/DIN/DOUT from up to down. where can I find the reference specification of this version console M/B?
    and I tried connect the valid I2S's signals to the pin header, the power consumption current changed to about 400mA, 12V input, but SPK+/- is still low.
  • 0 in reply to Benn2017
    Prodigy 50 points
    Hi, Diego
    for hybrid flow4, whether gpio1/2/3 should be pull high or low?
    shematic:
    pasteboard.co/wLL0pUO9l.png

    console m/b:
    pasteboard.co/wLNlBJfUH.png
  • 0 in reply to Diego Melendez
    Prodigy 50 points
    HI, Diego

    as you mentioned, SPK+/- output voltage equal to PVDD is not a normal behavior.
    I compared the electrical characters of EV board and our target board, the test conditions are listed as below.
    EV board: connect to control console and power on (not connected to PC)
    Target board: ADC output disabled by mcu and power on (SPK_MUTE is 2.79V and TAS5756 i2c is disconnected )

    EV Board Target Board
    BSTRPA- 4.99V 5.10V
    BSTRPA+ 4.99V 5.10V
    BSTRPB- 4.99V 5.10V
    BSTRPB+ 4.99V 5.10V
    GVDD 5.38V 5.48V
    DVDD_REG 1865mV 1898mV

    others characters are same as to the EV board's. and I think the hardware is normal of the target board.

    but valid I2S's are enabled, SPK+/- output voltage are equal to PVDD. and the strange problem appeared, SPK+/- output voltage will change to half PVDD after measure SPK+/- voltage by multimeter.
    I can't understand this case.

    I tried connect i2s's signals to control console, but I don't find out external i2s connector on the control console (the control console is different with SLOU366.pdf illustrated as I replied ) .
    should you give some any suggestions?

    best

    Benn