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TAS5825M: Stereo mode with two mono

Davide Ballo
Intellectual 550 points
Part Number: TAS5825M
Other Parts Discussed in Thread: PUREPATH-CMBEVM

Hello,

I need to use two TAS5825M in PBTL configuration in a stereo application.

I need to send the left channel to one chip, and the right channel to the other chip.

How I can configure the TAS5825M to read only one channel?

Thanks.

Best Regards,

Davy

  • 0
    TI__Guru 52115 points

    Hi Davy,

    Just select Left Ch or Right Ch in the Input Mixer Tuning Window.  The default is (L+R)/2.

    Andy

  • 0 in reply to Andy Liu (BMS)
    Intellectual 550 points

    Hi Andy,

    thanks for your reply.

    I have a microcontroller onboard and I need to program the chip by I2C.

    I'm going to buy the PUREPATH-CMBEVM, but actually I need to program this function by I2C with a microcontroller.

    What are the registers to be writed?

    I need to write the registers at each power on or just the first time?

    Thanks.

    Best Regards,

    Davy

  • 0 in reply to Davide Ballo
    Expert 1035 points

    Answer is maybe in SLAA786A. Have a look at the register maps at the end.

    You can also export two register files with only the mixer values changed and compare the files.

    Maybe it is possible to change during run-time, but have not seen it described anywhere.

    Just try, if it does not work; enter sleep, update value and boot up again.

  • 0 in reply to Jesse van der Zouw
    Intellectual 550 points
    Hi Jesse,

    thanks very much for your reply.

    I found this information for Input Mixer:

    INPUT MIXER
    0x14 0x0B Left to Left 4 / 9.23 0x00800000 Left Channel Mixer
    Left Input Gain
    0x18 0x0B Right to Left 4 / 9.23 0x00000000 Left Channel Mixer
    Right Input Gain
    0x1C 0x0B Left to Right 4 / 9.23 0x00000000 Right Channel Mixer
    Left Input Gain
    0x20 0x0B Right to Right 4 / 9.23 0x00800000 Right Channel Mixer
    Right Input Gain

    I should write that registers and I should change the configuration that Andy posted in that photo.
    Thanks very much.

    Anyway, I'm waiting for the PUREPATH-CMBEVM board and I will try to use it for device configuration.

    Best Regards,
    Davy