TDA8421 Datasheet, PDF (6/26 Pages) NXP Semiconductors – Hi-fi stereo audio processor; I2C bus

Philips Semiconductors
Hi-fi stereo audio processor; I²C bus
Product specification
TDA8421
Subaddress
After the module address byte a second byte is used to select the functions for both channels:
• CH1 - Volume left, volume right, bass, treble and switch functions
• CH2 - Volume left, volume right and switch functions
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
128
64
32
16
MSB
CH1
CH2
FUNCTION
volume left
volume right
bass
treble
switch functions
volume left
volume right
switch functions
7
6
5
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
4
2
1
LSB
3
2
1
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
1
0
0
0
0
1
0
0
0
1
0
1
1
1
0
0
subaddress SAD
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
MSB
LSB
CH1
FUNCTION
volume left
volume right
bass
treble
switch functions
7
VL1 1
VR1 1
BA 1
TR 1
S1 1
6
5
1 V05
1 V15
11
11
1 MU
4
V04
V14
1
1
EFL
3
V03
V13
BA3
TR3
STL
2
V02
V12
BA2
TR2
ML1
1
V01
V11
BA1
TR1
ML0
0
V00
V10
BA0
TR0
IS
CH2
volume left
volume right
switch functions
VL2 1
VR2 1
S2 1
1 V25 V24
1 V35 V34
11
1
V23 V22
V21
V20
V33 V32
V31
V30
EXS MH1 MH0 1
May 1988
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