TAS5518 datasheet(45/103 Pages) TI

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TAS5518 Controls and Status

SLES115 — August 2004

TAS5518

The number of channels that are affected by the BKND_ERR signal is dependent upon the 6-channel

configuration signal. If the I2C setting 6-channel configuration is false, the TAS5518 places all eight PWM

outputs in the PWM backend error state, while not affecting any other internal settings or operations. If the

I2C setting six configuration is true, the TAS5518 brings the PWM outputs 1−6 to a backend error state, while

not affecting any other internal settings or operations. Table 2−4 shows the device output signal states during

backend error.

Table 2−4. Device Outputs During Backend Error

SIGNAL

SIGNAL STATE

Valid

Low

PWM P-outputs

M-State − low

PWM M-outputs

M-State − low

HPPWM P-outputs

M-State − low

HPPWM M-outputs

M-State − low

SDA

Signal Input (not driven)

2.2.4 Speaker / Headphone Selector (HP_SEL)

The HP_SEL terminal enables the headphone output or the speaker outputs. The headphone output receives

the processed data output from DAP and PWM channels 1 and 2.

In 6-channel configuration this feature does not affect the two lineout channels.

When low, the headphone output is enabled. In this mode the speaker outputs are disabled. When high, the

speaker outputs are enabled and the headphone is disabled.

Changes in the pin logic level results in a state change sequence using soft mute to the hard mute (M) state

for both speaker and headphone followed by a soft unmute.

When HP_SEL is low, the configuration of channels 1 and 2 are defined by the headphone configuration

channels 1 and 2.

2.2.5 Mute (MUTE)

The mute control provides a noiseless volume ramp to silence. Releasing mute provides a noiseless ramp

to previous volume. The TAS55508 has both a master and individual channel mute commands. A terminal

is also provided for the master MUTE. The low active master Mute I2C register and the MUTE terminal are

logically Or’ed together. If either is set to low, a mute on all channels is performed. The master mute command

operates on all channels regardless on whether the system is in six or eight channel configuration.

When MUTE is invoked, the PWM output stops switching and then goes to an idle state.

The master Mute terminal is used to support a variety of other operations in the TAS5518, such as setting the

inter-channel delay, the biquad coefficients, the serial interface format, and the clock rates. A mute command

by the master mute terminal, individual I2C mute, the AM interference mute sequence, the bank switch mute

sequence, or automute overrides an unmute command or a volume command. While a mute is active, the

commanded channels will be placed in a mute state. When a channel is unmuted, it goes to the last

commanded volume setting that has been received for that channel.

2.3

Device Configuration Controls

The TAS5518 provides a number of system configuration controls that are set at initialization and following

a reset.

•

Channel Configuration

•

Headphone Configuration

•

Audio System Configurations

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