TAS5548DCAR datasheet(22/116 Pages) TI1

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TAS5548

SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

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Power down is an asynchronous operation that does not require MCLK to go into the power-down state. To

initiate the power-up sequence requires MCLK to be operational and the TAS5548 to receive five MCLKs prior to

the release of PDN.

As long as the PDN pin is held low, the device is in the power-down state with the PWM outputs not switching.

During power down, all I2C and serial data bus operations are ignored. Table 3 shows the device output signals

while PDN is active.

Table 3. Device Outputs During Power Down

SIGNAL

SIGNAL STATE

VALID

Low

PWM P-outputs

Not Switching = Low

PWM M-outputs

Not Switching = Low

SDA

Inputs Ignored

PSVC

Low

Following the application of PDN, the TAS5548 does not perform a quiet shutdown to prevent clicks and pops

produced during the application (the leading edge) of this command. The application of PDN immediately

performs a PWM stop. A quiet stop sequence can be performed by first applying MUTE before PDN.

When PDN is released, the system goes to the end state specified by the MUTE and BKND_ERR pins and the

I2C register settings.

7.3.6.2.3

Back-End Error (BKND_ERR)

Back-end error is used to provide error management for back-end error conditions. Back-end error is a level-

sensitive signal. Back-end error can be initiated by bringing the BKND_ERR terminal low for a minimum of five

MCLK cycles. When BKND_ERR is brought low, the PWM sets either six or eight channels into the PWM back-

end error state. This state is described in PWM Features. Once the back-end error is removed, a delay of 5 ms is

performed before the system starts the output re-initialization sequence. After the initialization time, the TAS5548

begins normal operation. During back-end error I2C registers retain current values.

Table 4. Device Outputs During Back-End Error

SIGNAL

SIGNAL STATE

Valid

Low

PWM P-outputs

Non PWM Switching = low

PWM M-outputs

Non PWM Switching = low

PWM_HP P-outputs

Non PWM Switching = low

PWM_HP M-outputs

Non PWM Switching = low

SDA

Signal input (not driven)

7.3.6.2.3.1

BKND_ERR and VALID

The number of channels that are affected by the BKND_ERR signal depends on the setting of bit D1 of I2C

the PWM back-end error state. If the I2C setting (of bit D1) is 1, the TAS5548 is in 6-channel mode. For proper

operation in 6-channel mode, the lineout configuration registers (0x09 and 0x0A) must be 0x00 instead of the

default of 0xE0. In this case, VALID is pulled LOW, and the TAS5548 brings PWM outputs 1, 2, 3, 4, 7, and 8 to

a back-end error state, while not affecting lineout channels 5 and 6. Table 4 shows the device output signal

states during back-end error.

7.3.6.2.4

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.

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