TAS3001CPWR datasheet(28/56 Pages) TI

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5−2

While in fast-load mode, it is possible to update the parametric EQ without any audio processing delay. The audio

processor pauses while the RAM is being updated in this mode. It is recommended that parametric EQ be

downloaded in this mode. Bass and treble cannot be downloaded in this mode. Mixer1 and Mixer2 registers can be

downloaded in this mode or normal mode (FL bit = 0). It is not recommended to download the volume control register

and mixer registers in this mode. Once the download is complete, the fast-load bit needs to be cleared by writing a

0 into bit 7 of the main control register. This puts the TAS3001 into normal mode.

NOTE: While in the fast-load mode, the TAS3001 does not accept audio. The device must be

set to the normal mode before it can accept and process audio data.

When coming out of fast-load mode, it is good practice to be sure that the system is muted. This prevents the system

from producing spurious pops and clicks. Once back in normal mode, treble, bass, and volume controls can be

downloaded to complete device setup.

5.2

Power Consumption

During normal operation the average power consumption is 20 mA.

When RESET is held low, asserted, the TAS3001 draws an average current of 35 mA.

5.3

Power Down and Restart

The TAS3001 can be placed in a low-power mode. It is entered synchronously by asserting the POWERDOWN pin

high, logic 1, followed by asserting the RESET pin low, logic 1, 1

µs later. Figure 5−2 illustrates the timing for power

down. MCLK must be present for the TAS3001 to enter the power-down mode.

MCLK

NOTE: RESET and POWERDOWN do not have to be synchronized with MCLK.

RESET

POWERDOWN

µs

Figure 5−2. Power-Down Timing

To recover from the power-down state, the POWERDOWN pin is set low, logic 0, followed by asserting the RESET

pin high, logic 0, 1

µs later. Figure 5−3 illustrates the timing for start-up. MCLK must be present for the TAS3001 to

exit the power-down mode.

MCLK

NOTE: RESET and POWERDOWN do not have to be synchronized with MCLK.

RESET

POWERDOWN

µs

Figure 5−3. Start-Up Timing

TAS3001CPWR Datasheet(PDF) 28 Page - Texas Instruments