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TDA7344P Scheda tecnica(PDF) 8 Page - STMicroelectronics

Il numero della parte TDA7344P
Spiegazioni elettronici  DIGITAL CONTROLLED AUDIO PROCESSOR WITH SURROUND SOUND MATRIX
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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INTERFACE FEATURES
- Due to the fact that the MSB is used to select
if the byte transmitted is a subaddress (func-
tion) or a data (value), between a start and
stop condition, is possible to receive, how
many subaddresses and datas as wanted.
- The subaddress (function) is fixed until a new
subaddress is transmitted, so the TDA7344
can receive how many data as wanted for the
selected subaddress (without the need for a
new start condition)
- If TDA7344 receives a subaddress with the
LSB = 1 the incremental bus is selected, so it
enters in a loop condition that means that
every acknowledge will increase automat-
ically the subaddress (function) and it re-
ceives the data related to the new subad-
dress.
EXAMPLES
1) NO INCREMENTAL BUS
TDA7344 receives a start condition, the correct
chip address, a subaddress with the LSB = 0 (no
incremental bus), N-datas (all these datas con-
cern the subaddress selected), a new subad-
dress, N-data, a stop condition.
So it can receive in a single transmission how
many subaddress are necessary, and for each
subaddress how many data are necessary.
2) INCREMENTAL BUS
TDA7344 receives a start condition, the correct
chip address a subaddress with the LSB = 1 (in-
cremental bus): now it is in a loop condition with
an autoincrease of the subaddress.
The first data that it receives doesn’t concern the
subaddress sended but the next one, the second
one concerns the subaddress sended plus two in
the loop etc, and at the end it receives the stop
condition.
In the pictures there are some examples:
S = start
A
CHIP ADDRESS
0
80 (HEX)
1
82 (HEX)
ACK = acknowledge
B = 1 incremental bus, B = 0 no incremental bus
P = stop
SOFTWARE SPECIFICATION
Interface Protocol
The interface protocol comprises:
A start condition (s)
A chip address byte, containing the TDA7344
address (the 8th bit of the byte must be 0). The
TDA7344 must always acknowledge at the end
of each transmitted byte.
A subaddress (function) bytes (identified by the
MSB = 0)
A sequence of dates and subaddresses (N
bytes + achnowledge. The dates are identified
by MSB = 1, subaddresses by MSB = 0)
A stop condition (P)
1) one subaddress, with n data concerning that subaddress (no incremental bus)
ACK = Achnowledge
S = Start
P = Stop
TDA7344
8/20


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