TDA7342_06 Datasheet, PDF (12/20 Pages) STMicroelectronics – Digitally controlled audio processor

Software specification
4
Software specification
TDA7342
4.1
Interface protocol
The interface protocol comprises:
● A start condition (s)
● A chip address byte, (the LSB bit determines read/write transmission)
● A subaddress byte.
● A sequence of data (N-bytes + acknowledge)
● A stop condition (P)
Figure 6. Interface protocol
CHIP ADDRESS
SUBADDRESS
DATA 1 ... DATA n
MSB
S1000100
D05AU1575
LSB
R/W
MSB
LSB
MSB
ACK X X X I A₃ A₂ A₁ A₀ ACK
DATA
LSB
ACK P
ACK = Acknowledge
S = Start
P = Stop
I = Auto Increment
X = Not used
Max clock speed 500kbits/s
4.2
Auto increment
If bit I in the subaddress byte is set to "1", the auto increment of the subaddress is enabled
Table 5. Subaddress (receive mode)
MSB
X
X
X
I
A3
A2
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
LSB
Function
A1
A0
0
0 Input selector
0
1 Loudness
1
0 Volume
1
1 Bass, treble
0
0 Speaker attenuator LF
0
1 Speaker attenuator LR
1
0 Speaker attenuator RF
1
1 Speaker attenuator RR
0
0 Mute
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