TAS5414 datasheet(27/44 Pages) TI

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Hardware Control Pins

TAS5414

TAS5424

SLOS514 – FEBRUARY 2007

Table 18. External Control Register 6 (0x0D) Output Control

FUNCTION

Low-low state disabled all channels

–

Set channel 1 to low-low state

–

Set channel 2 to low-low state

–

Set channel 3 to low-low state

–

Set channel 4 to low-low state

–

Reserved

Table 19. External Control Register 7 (0x0E) Positive DC Detect Threshold Selection

FUNCTION

Default positive dc detect value

Minimum positive dc detect value

See Figure 11 to set positive dc detect value

Maximum positive dc detect value

Table 20. External Control Register 8 (0x0F) Negative DC Detect Threshold Selection

FUNCTION

Default negative dc detect value

Minimum negative dc detect value

See Figure 12 to set negative dc detect value

Maximum negative dc detect value

The TAS5414 and TAS5424 incorporate four discrete hardware pins for real-time control and indication of device

status.

FAULT pin: This active-low, open-drain output pin indicates the presence of a fault condition that requires

the TAS5414 and TAS5424 to go automatically into the Hi-Z mode or standby mode. When this pin is

asserted high, the device has acted to protect itself and the system from potential damage. The exact nature

of the fault can be read via I2C with the exception of faults that are the result of PVDD voltage excursions

above 25 Vdc or below 5.5 Vdc. In these instances, the device goes into standby mode and the I2C bus is

no longer operational. However, the fault is still indicated due to the fact that the FAULT pin is open-drain

and active-high.

CLIP_OTW pin: The function of this active-high pin is configured by the user to indicate one of the following

conditions: overtemperature warning, the detection of clipping, or the logical OR of both of these conditions.

The configuration is selected via I2C. During tweeter detect diagnostics, this pin also is asserted when a

tweeter is present.

MUTE pin: This active-low pin is used for hardware control of the mute/unmute function for all four channels.

Capacitor CMUTE is used to control the time constant for the gain ramp needed to produce a pop- and

click-free mute function. For pop- and click-free operation, the mute function should be implemented through

I2C commands. The use of a hard mute with an external transistor does not ensure pop- and click-free

operation, and is not recommended unless an emergency hard mute function is required in case of a loss of

I2C control. The value of CMUTE must be 330 nF for proper pop- and click-free operation.

STANDBY pin: When this active-low pin is asserted, the device goes into a complete shutdown, and current

draw is limited to 2

µA, typical. This is pin typically asserted when the car ignition is in the off position. It can

also be used to shut down the device rapidly when certain operating conditions are violated. All I2C register

content is lost when this pin is asserted. The I2C bus goes into the high-impedance state when the

STANDBY pin is asserted.

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