tda7468 STMicroelectronics, tda7468 Datasheet - Page 9

• Manufacturer Part Number: tda7468
• Description: Two Bands Digitally Controlled Audio Processor With Bass Alc Surround
• Manufacturer: STMicroelectronics

5
Interface Protocol
The interface protocol comprises:
■
■
■
■
■
ACK = Acknowledge
S = Start; P = Stop
A = Address
B = Auto Increment
6
6.1 No Incremental Bus
The TDA7468D receives a start condition, the correct chip address, a subaddress with the B = 0 (no in-
cremental bus), N-data (all these data concern the subaddress selected), a stop condition.
6.2 Incremental Bus
The TDA7468D receive a start conditions, the correct chip address, a subaddress with the B = 1 (incre-
mental bus): now it is in a loop condition with an autoincrease of the subaddress whereas SUBADDRESS
from "XXX1000" to "XXX1111" of DATA are ignored.
The DATA 1 concern the subaddress sent, and the DATA 2 concern the subaddress sent plus one in the
loop etc, and at the end it receivers the stop condition.
Table 5. POWER ON RESET CONDITION
S
S
A start condition (S)
A chip address byte, containing the TDA7468D address
A subaddress bytes
A sequence of data (N byte + acknowledge)
A stop condition (P)
S
MSB
MSB
SOFTWARE SPECIFICATION
EXAMPLES
MSB
MSB
1
1
D7
1
1
0
0
0
CHIP ADDRESS
CHIP ADDRESS
D96AU420
D96AU422
CHIP ADDRESS
D96AU421
0
0
0
0
0
0
1
1
1
D6
1
0
0
0
0
0
0
LSB
LSB
LSB
0
0
0
ACK
ACK
ACK
D5
1
MSB
MSB
MSB
X
X
X
X
X
X
SUBADDRESS
SUBADDRESS
SUBADDRESS
X
X
X
D4
1
1
B
0
D3
D3
D2 D1 D0
D2 D1 D0
DATA
D3
LSB
1
LSB
LSB
ACK
ACK
ACK
MSB
MSB
MSB
D2
1
DATA 1 to DATA n
DATA 1 to DATA n
DATA
DATA
DATA
DATA
D1
1
LSB
LSB
LSB
TDA7468D
ACK
ACK
ACK
LSB
D0
0
P
9/22
P
P