September 1992

6

Philips Semiconductors

Product specification

TDA8424

Table 1

Second byte after module address MAD

Definition of 3rd byte

A third byte is used to transmit data to the TDA8424. 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

Truth tables

Tables 3, 4 and 5 are truth tables for the switch functions

Table 3

Mode selector

Note

1. Must be set to logic 1

FUNCTION

128

64

32

16

8

4

2

1

MSB

LSB

76543210

Volume left

0

0

0

0

0

0

0

0

Volume right

0

0

0

0

0

0

0

1

Bass

0

0

0

0

0

0

1

0

Treble

0

0

0

0

0

0

1

1

00000000

00000000

00000000

00000000

Switch functions

0

0

0

0

1

0

0

0

subaddress SAD

MSB

LSB

FUNCTION

7

6

5

4

3

2

1

0

Volume left

VL

1

1

V05

V04

V03

V02

V01

V00

Volume right

VR

1

1

V15

V14

V13

V12

V11

V10

Bass

BA

1

1

1

1

BA3

BA2

BA1

BA0

Treble

TR

1

1

1

1

TR3

TR2

TR1

TR0

1111111

1

1111111

1

1111111

1

1111111

1

Switch functions

S1

1

1

MU

EFL

STL

ML1

ML0

1

FUNCTION

ML1

ML0

IS

Stereo

1

1

Sound A

0

1

Sound B

1

0