TDA7442D STMicroelectronics, TDA7442D Datasheet - Page 6
![IC PROCESSOR TONE/SURRND 28-SOIC](/photos/6/56/65690/stmicroelectronics-28-soic_sml.jpg)
TDA7442D
Manufacturer Part Number
TDA7442D
Description
IC PROCESSOR TONE/SURRND 28-SOIC
Manufacturer
STMicroelectronics
Type
Audio Processorr
Datasheet
1.TDA7442D013TR.pdf
(17 pages)
Specifications of TDA7442D
Applications
TV, HI-FI Systems
Mounting Type
Surface Mount
Package / Case
28-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TDA7442D
Manufacturer:
ST
Quantity:
20 000
TDA7442 - TDA7442D
3
Data transmission from microprocessor to the TDA7442D and vice versa takes place through the 2 wires
I
must be connected).
3.1 Data Validity
As shown in fig. 5, the data on the SDA line must be stable during the high period of the clock. The HIGH
and LOW state of the data line can only change when the clock signal on the SCL line is LOW.
3.2 Start and Stop Conditions
As shown in fig. 6 a start condition is a HIGH to LOW transition of the SDA line while SCL is HIGH. The
stop condition is a LOW to HIGH transition of the SDA line while SCL is HIGH.
3.3 Byte Format
Every byte transferred on the SDA line must contain 8 bits. Each byte must be followed by an acknowledge
bit. The MSB is transferred first.
3.4 Acknowledge
The master ( P) puts a restive HIGH level on the SDA line during the acknowledge clock pulse (see fig.
3). The peripheral (audio processor) that acknowledges has to pull-down (LOW) the SDA line during this
clock pulse.
The audio processor which has been addressed has to generate an acknowledge after the reception of
each byte, otherwise the SDA line remains at the HIGH level during the ninth clock pulse time. In this case
the master transmitter can generate the STOP information in order to abort the transfer.
3.5 Transmission without Acknowledge
Avoiding to detect the acknowledge of the audio processor, the P can use a simpler transmission: simply
it waits one clock without checking the slave acknowledging, and sends the new data.
This approach of course is less protected from misworking.
Figure 5. Data Validity on the I
Figure 6. Timing Diagram of I
Figure 7. Acknowledge on the I
6/17
2
C BUS interface, consisting of the two lines SDA and SCL (pull-up resistors to positive supply voltage
I
2
C BUS INTERFACE
SCL
SDA
SCL
SDA
SDA
SCL
START
START
2
CBUS
2
CBUS
2
CBUS
MSB
STABLE, DATA
1
DATA LINE
VALID
2
D99AU1033
D99AU1032
ALLOWED
CHANGE
DATA
3
7
8
ACKNOWLEDGMENT
FROM RECEIVER
STOP
D99AU1031
I
2
CBUS
9