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Original question:

TAS2505: About Standby Mode

TAS2505: Timing of Exit from Standby Mode of TAS2505

Albert Han
Prodigy 75 points
Part Number: TAS2505


Hi,

I wonder how TAS2505S can exit from the Standby mode. Is this transition automatic as soon as Host accesses TAS2505 through the interface? Or change back the register setting to wake up the device?

If it's automatic, then what is the timing of the transition?

Regards,

Albert

  • 0
    TI__Guru* 84915 points

    Hi, Albert,

    The difference between the standby mode and the active/normal mode is just the analog blocks state. In standby mode, the power supplies remain active, but the analog blocks (or master reference) must be disabled. Page 1 / Register 1 / Bit D4 controls the master reference power.

    The time between standby and active mode depends of the I2C writing and the reference power up delay (page 1 / register 122).

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 75 points

    I am not sure if I understood your answers. So let me ask you again specifically. 

    1. Is exit from Standby to Normal Mode automatic and instant when I2C is accessed to the amp?
    2. The timing of the transition depends on I2C writing and reference power up delay (page1 / register 122)?
    3. What state does the speaker amp enter after speaker completes the sound driving if Standby Mode is configured?

    Regards,

    Albert Han

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 75 points

    I have asked some more specific questions below. 

  • 0 in reply to Albert Han
    TI__Guru* 84915 points

    Hi, Albert,

    The standby mode is enabled when the master reference is powered down by page 1 / register 1. In order to enter to normal mode, this master reference must be powered up.

    So, the exit from Standby to Normal mode time depends of the master reference power up time + the I2C writing time. Page 1 / register 122 is used to configure the master reference power up time.

    The speaker amp enters in high impedance mode when it completes the sound driving if Standby Mode is configured.

    Best regards,
    Luis Fernando Rodríguez S.