TDA7572 Datasheet, PDF (28/64 Pages) STMicroelectronics – 200W mono bridge PWM amplifier with built-in step-up converter

I²C and mode control
5
I²C and mode control
TDA7572
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.
Table 19. Power-up mode control
Mode1
Mode0
State/function
0
0
Standby, or “Off”
NO I²C BUS mode
TDA7572 enabled
0
1
Configuration defaults read from pin
I²C disabled
Power-Up-Diagnostics disabled
I²C BUS mode
TDA7572 enabled
I²C enabled
Power-Up-Diagnostics disabled
1
1
TDA7572 enabled
Configuration defaults read from pins
I²C disabled
Power-Up-Diagnostics enabled
DIAGNOSTIC mode
TDA7572 enabled
1
0
Configuration defaults read from pins
I²C disabled
Power-Up-Diagnostics enabled
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.
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