TDA7400DTR STMicroelectronics, TDA7400DTR Datasheet - Page 20

• Manufacturer Part Number: TDA7400DTR
• Description: IC PROCESSOR CAR SIGNAL 28SOIC
• Manufacturer: STMicroelectronics
• Type: Car Signal Processorr

Specifications of TDA7400DTR

• Applications: Automotive Audio
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3977-2

TDA7400D
I
Interface Protocol
The interface protocol comprises:
-a start condition (S)
-a chip address byte (the LSB bit determines read
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.
SUBADDRESS (receive mode)
20/28
2
MSB
C BUS INTERFACE DESCRIPTION
S
I3
0
1
MSB
1
0
CHIP ADDRESS
D97AU627
I2
0
1
0
0
1
I1
0
1
1
0 R/W ACK
I0
0
1
LSB
A3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
MSB
X
AZ T
A2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
SUBADDRESS
I
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
A3 A2 A1 A0
LSB
/ write transmission)
-a subaddress byte
-a sequence of data (N-bytes + acknowledge)
-a stop condition (P)
Auto increment
If bit I in the subaddress byte is set to "1", the
autoincrement of the subaddress is enabled.
TRANSMITTED DATA (send mode)
SM = 1 Soft mute activated
ST = 1 Stereo mode
X = Not Used
A0
MSB
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
LSB
AntiRadiation Filter
off
on
AutoZero Remain
off
on
Testmode
off
on
Auto Increment Mode
off
on
Databyte Addressing
Input Selector
Volume
Treble
Bass
Speaker attenuator LF
Speaker attenuator RF
Speaker attenuator LR
Speaker attenuator RR
SoftMute / Bass Prog.
Stereodecoder
Noiseblanker
High Cut Control
Fieldstrength & Quality
Configuration
Stereodecoder Adjustment
Testing
ACK
X
MSB
X
DATA 1 to DATA n
X
FUNCTION
DATA
ST
SM
LSB
X
ACK
LSB
X
P