tda8421 NXP Semiconductors, tda8421 Datasheet - Page 6

• Manufacturer Part Number: tda8421
• Description: Hi-fi Stereo Audio Processor; I2c Bus
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Subaddress
After the module address byte a second byte is used to select the functions for both channels:
The subaddress SAD is stored within the TDA8421. Table 1 defines the coding of the second byte after the module
address MAD.
Table 1 Second byte after module address MAD
Definition of 3rd byte
A third byte is used to transmit data to the TDA8421. Table 2 defines the coding of the third byte after module address
MAD and subaddress SAD.
Table 2 Third byte after module address MAD and subaddress SAD
May 1988
CH1
CH2
CH1
CH2
CH1 - Volume left, volume right, bass, treble and switch functions
CH2 - Volume left, volume right and switch functions
Hi-fi stereo audio processor; I
FUNCTION
volume left
volume right
bass
treble
switch functions
volume left
volume right
switch functions
volume left
volume right
bass
treble
switch functions
volume left
volume right
switch functions
FUNCTION
VL1
VR1
BA
TR
S1
VL2
VR2
S2
MSB
128
7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
MSB
7
2
C bus
64
6
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
6
V05
V15
1
1
MU
V25
V35
1
6
32
5
0
0
0
0
0
0
0
0
5
V04
V14
1
1
EFL
V24
V34
1
16
4
0
0
0
0
0
0
0
0
4
V03
V13
BA3
TR3
STL
V23
V33
EXS
3
8
3
0
0
0
0
1
0
0
1
V02
V12
BA2
TR2
ML1
V22
V32
MH1
subaddress SAD
2
4
2
0
0
0
0
0
1
1
1
V01
V11
BA1
TR1
ML0
V21
V31
MH0
Product specification
1
TDA8421
2
1
0
0
1
1
0
0
0
0
V00
V10
BA0
TR0
IS
V20
V30
1
LSB
0
1
0
0
1
0
1
0
0
1
0
LSB