TDA7429S Datasheet, PDF (10/20 Pages) STMicroelectronics – DIGITALLY CONTROLLED AUDIO PROCESSOR WITH SURROUND SOUND MATRIX

TDA7429S - TDA7429T
SOFTWARE SPECIFICATION
Interface Protocol
The interface protocol comprises:
A start condition (S)
A chip address byte, containing the TDA7429
address
A subaddress bytes
A sequence of data (N byte + achnowledge)
A stop condition (P)
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
S 1 0 0 0 0 0 A 0 ACK B
D95AU226A
DATA
LSB
MSB
ACK
DATA
LSB
ACK P
ACK = Achnowledge
S = Start
P = Stop
A = Address
B = Auto Increment
EXAMPLES
No Incremental Bus
The TDA7429 receives a start condition, the cor-
rect chip address, a subaddress with the MSB = 0
(no incremental bus), N-datas (all these datas
concern the subaddress selected), a stop condi-
tion.
CHIP ADDRESS
SUBADDRESS
MSB
LSB
MSB
LSB
MSB
S 1 0 0 0 0 0 A 0 ACK 0 X X X D3 D2 D1 D0 ACK
D95AU306
DATA
DATA
LSB
ACK P
Incremental Bus
The TDA7429 receive s a start condition, the cor-
rect chip address, a subaddress with the MSB = 1
(incremental bus): now it is in a loop condition
with an autoincrease of the subaddress whereas
SUBADDRESS from ”1XXX1010” to ”1XXX1111”
of DATA are ignored.
The DATA 1 concern thesubaddress sent, and
the DATA 2 concern the subaddress sent plus
one in the loop etc, and at the end it receivers the
stop condition.
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
LSB
MSB
S 1 0 0 0 0 0 A 0 ACK 1 X X X D3 D2 D1 D0 ACK
D95AU307
DATA
LSB
ACK P
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