TDA7449L Datasheet, PDF (7/13 Pages) STMicroelectronics – LOW COST DIGITALLY CONTROLLED AUDIO PROCESSOR

SOFTWARE SPECIFICATION
Interface Protocol
The interface protocol comprises:
A start condition (S)
A chip address byte, containing the TDA7449L
TDA7449L
address
A subaddress bytes
A sequence of data (N byte + acknowledge)
A stop condition (P)
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
S 1 0 0 0 1 0 0 0 ACK X X X B
D96AU420
LSB
MSB
DATA
ACK
DATA
LSB
ACK P
ACK = Acknowledge
S = Start
P = Stop
A = Address
B = Auto Increment
EXAMPLES
No Incremental Bus
The TDA7449L receives a start condition, the cor-
rect chip address, a subaddress with the B = 0
(no incremental bus), N-data (all these data con-
cern the subaddress selected), a stop condition.
CHIP ADDRESS
SUBADDRESS
MSB
LSB
MSB
LSB
MSB
S 1 0 0 0 1 0 0 0 ACK X X X 0 D3 D2 D1 D0 ACK
D96AU421
DATA
DATA
LSB
ACK P
Incremental Bus
The TDA7449L receive a start conditions, the
correct chip address, a subaddress with the B = 1
(incremental 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.
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
LSB
MSB
S 1 0 0 0 1 0 0 0 ACK X X X 1 D3 D2 D1 D0 ACK
D96AU422
DATA
LSB
ACK P
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