TDA7429L STMicroelectronics, TDA7429L Datasheet - Page 6

• Manufacturer Part Number: TDA7429L
• Description: IC PROCESSOR AUDIO 3BAND 42-SDIP
• Manufacturer: STMicroelectronics
• Type: Audio Processorr

Specifications of TDA7429L

• Applications: TV, HI-FI Systems
• Mounting Type: Through Hole
• Package / Case: 42-SDIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7429L
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 (mP) puts a resistive HIGH level on the SDA line during the acknowledge clock pulse (see fig. 7).
The peripheral (audioprocessor) that acknowledges has to pull-down (LOW) the SDA line during this clock
pulse.
The audioprocessor 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 audioprocessor, 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
SDA
SCL
SDA
SCL
START
SDA
SCL
START
MSB
1
STABLE, DATA
2
DATA LINE
2
C bus
C bus
2
VALID
C bus
2
D99AU1033
D99AU1032
ALLOWED
CHANGE
DATA
3
7
8
ACKNOWLEDGMENT
FROM RECEIVER
STOP
D99AU1031
I
2
CBUS
9