TDA7461N Datasheet, PDF (22/31 Pages) STMicroelectronics – CAR RADIO SIGNAL PROCESSOR

TDA7461N
I²C BUS INTERFACE DESCRIPTION
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)
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
LSB
MSB
S 1 0 0 0 1 1 0 R/W ACK X AZ T I A3 A2 A1 A0 ACK
D97AU627
DATA
LSB
ACK P
S = Start
ACK = Acknowledge
AZ = AutoZero-Remain
T = Testing
I = Autoincrement
P = Stop
MAX CLOCK SPEED 500kbits/s
The transmitted data is automatically updated af-
ter each ACK.
Transmission can be repeated without new chip
address.
Auto increment
If bit I in the subaddress byte is set to ”1”, the
autoincrement of the subaddress is enabled.
TRANSMITTED DATA (send mode)
MSB
X X X X ST SM
SM = Soft mute activated
ST = Stereo
X = Not Used
LSB
XX
SUBADDRESS (receive mode)
MSB
X
AZ
T
I
T = Testmode
I = Autoincrement
AZ = Auto Zero Remain
X = not used
LSB
FUNCTION
A3
A2
A1
A0
0
0
0
0 Input selector
0
0
0
1 Loudness / Auto-Zero
0
0
1
0 Volume
0
0
1
1 Softmute / Beep
0
1
0
0 Bass / Treble Attenuator
0
1
0
1 Bass / Treble Configuration
0
1
1
0 Speaker attenuator LF
0
1
1
1 Speaker attenuator LR
1
0
0
0 Speaker attenuator RF
1
0
0
1 Speaker attenuator RR / Blanktime adjust
1
0
1
0 Stereodecoder
1
0
1
1 Noiseblanker
1
1
0
0 Fieldstrength Control
1
1
0
1 Configuration
1
1
1
0 Stereodecoder Adjustment
1
1
1
1 Testing
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