TAS2557 datasheet(36/110 Pages) TI1

36 / 110 page

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Battery

Guard

Brownout

Vbatt

Class-H

Boost

On/Off

Boost

Level

DAC

Vbatt

TAS2557

SLASEC2 – NOVEMBER 2016

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Product Folder Links: TAS2557

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9.5.4 Software Reset

The TAS2557 internal logic must be initialized to a known condition for proper device function by doing a

software reset. Performing software reset after a hardware reset is mandatory for reliable device boot up. A

software reset can be accomplished by asserting RESET bit in Table 21, which is self clearing. This will restore

all registers to their default values. After software reset is performed, no register read/write should be performed

within 100us while initialization sequence occurs.

Table 21. Software Reset

RESET[0] (RESET)

Action

Don't reset (default)

Reset(Self clearing)

9.5.5 Device Processing Modes

The TAS2557 DSP can be initialized into one of three modes. The advanced processing features in these

modes, such as battery guard, thermal fold-back, brownout, and boost are configured using PurePath™ Console

3 Software TAS2557 Application

Table 22. Device Power Mode

BOOT_MODE[3:0] (DSP_MODE)

Operating Mode

0000

Reserved

0001

Mode 1 - PCM input playback only (default)

0010

Mode 2 - PCM input playback + PCM IVsense output

0011

Mode 3 - Smart Amp Mode

9.5.5.1 Mode 1 - PCM input playback only

ROM mode 1 provides the quickest initialization for the TAS2557 power up and is the lowest power mode. This

mode can be used to play a known power up audio sequence before the rest of the audio system software is

loaded. The mode provides fault protection, brownout protection, volume control, and Class-H controller. The EQ

and Battery Guard can be enabled wth minimal additional configuration. The speaker protection algorithm is not

running in this mode and the I/V sense ADCs are powered down to minimize power consumption. The PLL can

be disabled for even lower power consumption if the MCLK supplied is at least 12.288MHz for any fs which is

multiple or sub-multiple of 48kHz, or 11.2896 MHz for Fs of 44.1kHz. This mode should be used to characterize

the electrical performance on the TAS2557 without any influence from the protection algorithm present in other

modes.

Figure 41. ROM Mode 1 Processing Block Diagram

9.5.5.2 Mode 2 - PCM input playback + PCM IVsense output

ROM mode 2 is similar to ROM mode 1 except the I/V sense ADCs are powered up and the data is routed back

on the L/R return channels of the ASI port. This mode can be used to return the I/V data to the host and perform

alternate computations on the speaker I/V measurements.

TAS2557 Datasheet(PDF) 36 Page - Texas Instruments

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