LC75421

Manufacturer Part NumberLC75421
DescriptionElectronic Volume Controller for Cars
ManufacturerSanyo Semiconductor Corporation
LC75421 datasheet
 


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Control Timing and Data Format

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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.
CE
DI
B0 B1 B2 B3 A0 A1 A2 A3
CL
CE
CL
DI
B
B
B
B
A
A
A
A
0
1
2
3
0
1
2
3
1 0 0 0 0 0 0 1
Address code
D
D
D
D
D
D
D
D
D
D
D
D
0
1
2
3
4
5
6
7
8
9
10
11
Bass control
Fader step control
Boost
0 0 0 0
– dB
1 1 1 0
STEP15
1 0 0 0
–60 dB
0 1 1 0
STEP14
0 1 0 0
–45 dB
1 0 1 0
STEP13
1 1 0 0
–35 dB
0 0 1 0
STEP12
0 0 1 0
–25 dB
1 1 0 0
STEP11
1 0 1 0
–20 dB
0 1 0 0
STEP10
0 1 1 0
–18 dB
1 0 0 0
STEP9
1 1 1 0
–16 dB
0 0 0 0
STEP8
0 0 0 1
–14 dB
1 0 0 1
STEP7
1 0 0 1
–12 dB
0 1 0 1
STEP6
0 1 0 1
–10 dB
1 1 0 1
STEP5
1 1 0 1
–8 dB
0 0 1 1
STEP4
0 0 1 1
–6 dB
1 0 1 1
STEP3
1 0 1 1
–4 dB
0 1 1 1
STEP2
0 1 1 1
–2 dB
1 1 1 1
STEP1
1 1 1 1
0 dB
Cut
Treble control
1 1 1 0
Super bass control
0 1 1 0
0 0 0 0
STEP0(FLAT)
1 0 1 0
1 0 0 0
STEP1
0 0 1 0
0 1 0 0
STEP2
1 1 0 0
1 1 0 0
STEP3
0 1 0 0
0 0 1 0
STEP4
1 0 0 0
1 0 1 0
STEP5
0 0 0 0
0 1 1 0
STEP6
1 0 0 1
1 1 1 0
STEP7
0 1 0 1
1 1 0 1
0 0 0 1
STEP8
1 0 0 1
STEP9
0 0 1 1
1 0 1 1
0 1 0 1
STEP10(BOOST max)
0 1 1 1
1 1 1 1
LC75421M
D0
D1 D2 D3 D4 D5
1 s
1 s
1 s
min
min
min
1 s
min
1 s
T
DEST
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Volume control
Fader
rear/front
control
Input switch control (1)
Boost
STEP15
STEP14
STEP13
STEP12
STEP11
STEP10
STEP9
STEP8
STEP7
STEP6
STEP5
STEP4
STEP3
STEP2
STEP1
Cut
D38 D39 D40 D41 D42 D43
1 s
min
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Rear
0
Input mute
Front
1
switch control
Input switch control (2)
OFF
0
ON
1
TEST mode
Input gain control
Channel selection
0 0 0 0
0 dB
0 0
Initial setting
1 0 0 0
+1.25 dB
1 0
Lch
0 1 0 0
+2.50 dB
0 1
Rch
1 1 0 0
+3.75 dB
1 1
L/R simultaneous
0 0 1 0
+5.00 dB
1 0 1 0
+6.25 dB
0 1 1 0
+7.50 dB
1 1 1 0
+8.75 dB
Output gain control
0 0 0 1
+10.00 dB
1 0 0 1
+11.25 dB
0 0
0 dB
0 1 0 1
+12.50 dB
0 1
0 dB
1 1 0 1
+13.75 dB
1 0
+6.5 dB
0 0 1 1
+15.00 dB
1 1
+8.5 dB
1 0 1 1
+16.25 dB
0 1 1 1
+17.50 dB
1 1 1 1
+18.75 dB
Caution: Be sure to set D36 to D38 and D40 to D43
to “0” for the TEST bit of the IC.
D
43
No. 6866-6/24