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TAS5825M: Need Confirmations of TAS5825 Startup Up and Shutdown Time on Deep Sleep, Sleep, Hi-Z and Auto Modes

Wayne Chen (Audio AE)
Genius 15950 points
Part Number: TAS5825M


Hi Sirs,

Would you please assist to verify if my TAS5825 startup and shutdown time in line with specifications?

CH1=I2C, CH2=Class-D PWM, CH3=BCLK

Deep Sleep Command to Class-D PWM off -> 4.45ms

w 98 00 00
w 98 7f 00
w 98 03 00



Deep Sleep Mode to Power Up -> 2.53ms

w 98 00 00
w 98 7f 00
w 98 03 03






Sleep Command to Class-D PWM off -> 4.38ms

w 98 00 00
w 98 7f 00
w 98 03 01




Sleep Mode to Power Up -> 2.54ms

w 98 00 00
w 98 7f 00
w 98 03 03



Hi-Z Command to Class-D PWM off -> 4.25ms

w 98 00 00
w 98 7f 00
w 98 03 02




Hi-Z Mode to Power Up -> 16.06ms

w 98 00 00
w 98 7f 00
w 98 03 03



BCLK off to Class-D Auto Off in Play Mode -> 770.4us

w 98 00 00
w 98 7f 00
w 98 03 03



BCLK on to Class-D Auto on in Play Mode -> 2.24ms

w 98 00 00
w 98 7f 00
w 98 03 03



Thank you and Best regards,

Wayne Chen
01/02/2019

  • 0
    TI__Mastermind 24835 points
    Hi Wayne,
    We are looking into this and will get back to you late.
    Best regards,
    Shawn Zheng
  • 0
    TI__Genius 9995 points
    Hi Wayne,

    I would verify this data, please also help to share the main concern about the time.
    Further, as you known, even PWM begins to swtich, the volume need the ramp up time to obtain normal volume too.

    Regards,
    Alix Wan.
  • 0 in reply to Alix Wan
    TI__Genius 15950 points

    Hi Alix,

    Thanks for your concern. My customer found 2ms delay between I2C wakeup commands in deep sleep mode and Class-D start running on the system board, thus we need product line's official data to compare with our test results.

    Thank you and Best regards,

    Wayne Chen
    01/03/2018

  • 0 in reply to Wayne Chen (Audio AE)
    TI__Genius 9995 points

    Hi Wayne,

    Usually, TAS5825 needs to follow the sequence below:

    1. To play mode: deep sleep mode --> sleep mode --> Hiz mode --> play mode: [1. PWM switching-->2. If you are playing music, then it also needs Volume ramp up time (volume ramps up to normal, which can be configured by Book0/page0/Register 0x33 )]
    2. To deep sleep mode: play mode (With music is on: ramp down first then begin to change to Hiz mode; Without music is on, auto-mute is enabled, directly enter into Hiz without ramping down) --> Hiz mode --> sleep mode/deep sleep mode;
    3. BCLK halt: play mode  (With music is on: ramp down first then begin to change to Hiz mode; Without music is on, auto-mute is enabled, directly enter into Hiz without ramping down)  --> Hiz mode

    Based on my investigation, the results below are for your reference:

    To play mode:

    1. Deep sleep to sleep: ~400us;
    2. Sleep to play: ~2.4ms
    3. Hiz to play mode: can be ignored;

    Leave from play mode:

    1. Ramp down: I do not know your Fs and volume: but you can calculate by your register setting; If no music is played and auto-mute is enabled, ramp down time is ~0 and you can find that entering into Hiz/sleep mode/deep sleep mode/ needs nearly no delay time.
    2. Play to Hiz/sleep/deep sleep: can be ignored;

    Regards,

    Alix Wan.

  • 0 in reply to Alix Wan
    TI__Genius 15950 points

    Thanks for your confirmation, Alix...Wayne Chen