Control Timing and Data Format

To control the LC75421M, input specified serial data to the CE, CL, and DI pins.

The data configuration consists of a total of 52 bits broken down into 8 address bits and 44 data bits.

No. 6866-6/24

LC75421M

CE

B0

B1

B2

B3

A0

A1

A2

A3

1

µs

min

1

µs

min

1

µs

min

1

B

0

D

0

D

1

D

2

D

3

D

4

D

5

D

6

D

7

D

8

D

9

D

10

D

11

D

12

D

13

D

14

D

15

D

16

D

17

D

18

D

19

D

20

D

21

D

22

D

23

0

1

0

1

D

24

D

25

D

26

D

27

D

28

D

29

D

30

D

31

D

32

D

33

D

34

D

35

D

36

D

37

D

38

D

39

D

40

D

41

D

42

D

43

B

1

B

2

B

3

A

0

A

1

A

2

A

3

1 0 0 0 0 0 0 1

1

µs

min

1

µs

min

D0

D1

D2

D3

D4

D5

D38 D39 D40 D41 D42 D43

DI

DI

Super bass control

Treble control

Boost

Boost

Caution: Be sure to set D36 to D38 and D40 to D43

to “0” for the TEST bit of the IC.

CL

CL

CE

Address code

Fader step control

0 0 0 0

1 0 0 0

0 1 0 0

1 1 0 0

0 0 1 0

1 0 1 0

0 1 1 0

1 1 1 0

0 0 0 1

1 0 0 1

0 1 0 1

1 1 0 1

0 0 1 1

1 0 1 1

0 1 1 1

1 1 1 1

–

∞ dB

–60 dB

–45 dB

–35 dB

–25 dB

–20 dB

–18 dB

–16 dB

–14 dB

–12 dB

–10 dB

–8 dB

–6 dB

–4 dB

–2 dB

0 dB

0 0 0 0

1 0 0 0

0 1 0 0

1 1 0 0

0 0 1 0

1 0 1 0

0 1 1 0

1 1 1 0

0 0 0 1

1 0 0 1

0 1 0 1

1 1 0 1

0 0 1 1

1 0 1 1

0 1 1 1

1 1 1 1

0 dB

+1.25 dB

+2.50 dB

+3.75 dB

+5.00 dB

+6.25 dB

+7.50 dB

+8.75 dB

+10.00 dB

+11.25 dB

+12.50 dB

+13.75 dB

+15.00 dB

+16.25 dB

+17.50 dB

+18.75 dB

0 0

0 1

1 0

1 1

0 0

1 0

0 1

1 1

0 dB

0 dB

+6.5 dB

+8.5 dB

1 1 1 0

0 1 1 0

1 0 1 0

0 0 1 0

1 1 0 0

0 1 0 0

1 0 0 0

0 0 0 0

1 0 0 1

0 1 0 1

1 1 0 1

0 0 1 1

1 0 1 1

0 1 1 1

1 1 1 1

STEP15

STEP14

STEP13

STEP12

STEP11

STEP10

STEP9

STEP8

STEP7

STEP6

STEP5

STEP4

STEP3

STEP2

STEP1

Cut

1 1 1 0

0 1 1 0

1 0 1 0

0 0 1 0

1 1 0 0

0 1 0 0

1 0 0 0

0 0 0 0

1 0 0 1

0 1 0 1

1 1 0 1

0 0 1 1

1 0 1 1

0 1 1 1

1 1 1 1

STEP15

STEP14

STEP13

STEP12

STEP11

STEP10

STEP9

STEP8

STEP7

STEP6

STEP5

STEP4

STEP3

STEP2

STEP1

Cut

0 0 0 0

1 0 0 0

0 1 0 0

1 1 0 0

0 0 1 0

1 0 1 0

0 1 1 0

1 1 1 0

0 0 0 1

1 0 0 1

0 1 0 1

STEP0(FLAT)

STEP1

STEP2

STEP3

STEP4

STEP5

STEP6

STEP7

STEP8

STEP9

STEP10(BOOST max)

Bass control

Volume control

Fader

rear/front

control

Rear

Front

OFF

ON

TEST mode

Input switch control (1)

Input switch control (2)

Input mute

switch control

Input gain control

Channel selection

Initial setting

Lch

Rch

L/R simultaneous

Output gain control