TAS5548 datasheet(20/118 Pages) TI2

20 / 118 page

TAS5548

SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

www.ti.com

Feature Description (continued)

This section describes some of these controls and status functions. The I2C summary and detailed register

descriptions are contained in Register Maps and I 2C Serial-Control Interface.

7.3.6.1 I2C Status Registers

The TAS5548 has two status registers that provide general device information. These are the general status

7.3.6.1.1

General Status Register (0x01)

•

Device identification code

7.3.6.1.2

Error Status Register (0x02)

•

No internal errors (the valid signal is high)

•

Audio Clip indicator. Writing to the register clears the indicator.

•

This error status register is normally used for system development only.

7.3.6.2 TAS5548 Pin Controls

The TAS5548 provide a number of terminal controls to manage the device operation. These controls are:

•

RESET

•

PDN

•

BKND_ERR

•

HP_SEL

•

MUTE

•

PSVC

•

EMO1 (see System Power Contoller section)

•

EMO2 (see System Power Contoller section)

7.3.6.2.1

Reset (RESET)

The TAS5548 is placed in the reset mode either by the power-up reset circuitry when power is applied, or by

setting the RESET terminal low.

RESET is an asynchronous control signal that restores the TAS5548 to the hard-mute state (Non PWM

Switching). Master volume is immediately set to full attenuation (there is no ramp down). Reset initiates the

device reset without an MCLK input. As long as the RESET terminal is held low, the device is in the reset state.

During reset, all I2C and serial data bus operations are ignored.

Table 1 shows the device output signals while RESET is active.

Table 1. Device Outputs During Reset

SIGNAL

SIGNAL STATE

Valid

Low

PWM P-outputs

Low (Non PWM Switching)

PWM M-outputs

Low (Non PWM Switching)

SDA

Signal input (not driven)

Because RESET is an asynchronous signal, clicks and pops produced during the application (the leading edge)

of RESET cannot be avoided. However, the transition from the hard-mute state (Non PWM Switching) to the

operational state is performed using a quiet start-up sequence to minimize noise. This control uses the PWM

reset and unmute sequence to shut down and start up the PWM. If a completely quiet reset or power-down

sequence is desired, MUTE should be applied before applying RESET.

The rising edge of the reset pulse begins device initialization before the transition to the operational mode.

During device initialization, all controls are reset to their initial states. Table 2 shows the default control settings

following a reset.

Submit Documentation Feedback

Product Folder Links: TAS5548

TAS5548 Datasheet(PDF) 20 Page - Texas Instruments

TAS5548 Datasheet(HTML) 20 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL