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TDA7438D датащи(PDF) 8 Page - STMicroelectronics

номер детали TDA7438D
подробное описание детали  THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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SOFTWARE SPECIFICATION
Interface Protocol
The interface protocol comprises:
A start condition (S)
A chip address byte, containing the TDA7438
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
S
10001000
ACK
ACK
DATA
ACK
P
MSB
LSB
MSB
LSB
MSB
LSB
CHIP ADDRESS
D96AU420
X
DATA
SUBADDRESS
DATA 1 to DATA n
XXB
EXAMPLES
No Incremental Bus
The TDA7438 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.
S
10001000
ACK
ACK
DATA
ACK
P
MSB
LSB
MSB
LSB
MSB
LSB
CHIP ADDRESS
D96AU421
XD3
SUBADDRESS
DATA
XX
0
D2 D1 D0
Incremental Bus
The TDA7438 receive a start conditions, the cor-
rect 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.
S
10001000
ACK
ACK
DATA
ACK
P
MSB
LSB
MSB
LSB
MSB
LSB
CHIP ADDRESS
D96AU422
XD3
SUBADDRESS
DATA 1 to DATA n
XX
1
D2 D1 D0
TDA7438
8/17


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