Datasheet

9/23
TDA7468
5 SOFTWARE SPECIFICATION
Interface Protocol
The interface protocol comprises:
 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)
ACK = Acknowledge
S = Start; P = Stop
A = Address
B = Auto Increment
6 EXAMPLES
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
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
1 111111 0
S 1 0 0 0 1 0 0 0 ACK ACK DATA ACK P
MSB
LSB MSB LSB MSB LSB
CHIP ADDRESS
D96AU420
X
DATA
SUBADDRESS DATA 1 to DATA n
X
X
B
S 1 0 0 0 1 0 0 0 ACK ACK DATA ACK P
MSB
LSB MSB LSB MSB LSB
CHIP ADDRESS
D96AU421
X
D3
SUBADDRESS DATA
X
X
0
D2 D1 D0
S 1 0 0 0 1 0 0 0 ACK ACK DATA ACK P
MSB
LSB MSB LSB MSB LSB
CHIP ADDRESS
D96AU422
X
D3
SUBADDRESS DATA 1 to DATA n
X
X
1
D2 D1 D0