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TDA7572 データシート(PDF) 28 Page - STMicroelectronics

部品番号 TDA7572
部品情報  200W mono bridge PWM amplifier with built-in step-up converter
PDF  64 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7572 データシート(HTML) 28 Page - STMicroelectronics

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I2C and mode control
TDA7572
28/64
5
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
0
0
Standby, or “Off”
01
NO I2C BUS mode
TDA7572 enabled
Configuration defaults read from pin
I2C disabled
Power-Up-Diagnostics disabled
11
I2C BUS mode
TDA7572 enabled
I2C enabled
Power-Up-Diagnostics disabled
TDA7572 enabled
Configuration defaults read from pins
I2C disabled
Power-Up-Diagnostics enabled
10
DIAGNOSTIC mode
TDA7572 enabled
Configuration defaults read from pins
I2C disabled
Power-Up-Diagnostics enabled



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