TDA7572 datasheet(28/64 Pages) STMICROELECTRONICS

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I2C and mode control

TDA7572

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I2C and mode control

The Mode1 and Mode0 pins are used to enable TDA7572. These perform the function of

bringing the IC out of standby (typically handled by a single standby pin on most audio IC's)

as well as determining if the I2C bus is active or if power-up Diagnostics shall automatically

occurs.

The Auto-mute Voltage pin is used to provide an under-voltage-lockout for the IC. Using a

resistor divider between V2P5 and SVR a series of comparator prevent the IC from power-

up further until sufficient voltage is present at VSP and SVR(equal to GND in the split supply

case. Once this voltage requirement is met, the chip is forced into mute (a special, direct

form of mute that does not use or act upon the MUTE pin) under a second, higher voltage

threshold is met. At this point the IC performs its normal power-up, controlled by the state of

the MODE pins and the various configuration pins. Refer to the under-voltage lockout

(UVLO) section of the documentation for details on these thresholds.

The Auto-mute Voltage pin is also used to provide an over-voltage shutdown based on

absolute voltage of VSP-VSM.

When I2C bus is active, determined by the Mode0 and Mode1 pins, any operating mode of

the IC may be modified and diagnostics may be controlled and results read back.

Table 19.

Power-up mode control

Mode1

Mode0

State/function

Standby, or “Off”

NO I2C BUS mode

TDA7572 enabled

Configuration defaults read from pin

I2C disabled

Power-Up-Diagnostics disabled

I2C BUS mode

TDA7572 enabled

I2C enabled

Power-Up-Diagnostics disabled

TDA7572 enabled

Configuration defaults read from pins

I2C disabled

Power-Up-Diagnostics enabled

DIAGNOSTIC mode

TDA7572 enabled

Configuration defaults read from pins

I2C disabled

Power-Up-Diagnostics enabled

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