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7442 Datasheet(PDF) 7 Page - STMicroelectronics

Part # 7442
Description  TONE CONTROL AND SURROUND DIGITALLY CONTROLLED AUDIO PROCESSOR
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

7442 Datasheet(HTML) 7 Page - STMicroelectronics

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TDA7442 - TDA7442D
4
SOFTWARE SPECIFICATION
Interface Protocol
The interface protocol comprises:
A start condition (S)
A chip address byte, containing the TDA7442D
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
4.1 EXAMPLES
4.1.1 No Incremental Bus
The TDA7442D receives a start condition, the correct chip address, a subaddress with the MSB = 0 (no
incremental bus), N-datas (all these data concern the subaddress selected), a stop condition.
4.1.2 Incremental Bus
The TDA7442D receive a start conditions, the correct chip address, a subaddress with the MSB = 1 (in-
cremental bus): now it is in a loop condition with an autoincrease of the subaddress whereas SUBAD-
DRESS from "1XXX1010" to "1XXX1111" of DATA are ignored.
The DATA 1 concern the subaddress sent, and the DATA 2 concerns the subaddress sent plus one sent
in the loop etc, and at the end it receivers the stop condition.
S
1
0
0
0
0
0
A
0
ACK
ACK
DATA
ACK
P
MSB
LSB
MSB
LSB
MSB
LSB
CHIP ADDRESS
D95AU226A
B
DATA
SUBADDRESS
DATA 1 to DATA n
S
1
0
0
0
0
0
A
0
ACK
ACK
DATA
ACK
P
MSB
LSB
MSB
LSB
MSB
LSB
CHIP ADDRESS
D95AU306
0
D3
SUBADDRESS
DATA
X
X
X
D2 D1 D0
S
1
0
0
0
0
0
A
0
ACK
ACK
DATA
ACK
P
MSB
LSB
MSB
LSB
MSB
LSB
CHIP ADDRESS
D95AU307
1
D3
SUBADDRESS
DATA 1 to DATA n
X
X
X
D2 D1 D0


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