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TPA6130A2: I2C communication is worked properly, but no audio output

Part Number: TPA6130A2

Tool/software:

I have the following connection, 2 line in source and 1 headphone output.

Both Amplifiers can be programmed correctly, register Write/Read correctly. (using a mux to switch I2C connection to either IC)

2 conditions;

  1. Both amplifiers are enabled
  2. either one of the amplifiers is enabled

I2C command send:

  • set different volume level
  • amplifier is enabled and unmute (reg1 set to 11000000b, reg2 set to 00XXXXXXb)
  • amplifier's output is HiZ when in disabled mode (reg1 set to 00000000b, reg3 set to 00000011b)

Problem encountered:

  • There is no output from the HP out.
  • HP out show a 6ohm reference to GND (it shows HiZ, when both amplifiers are set to HiZ)