LP3954 Datasheet, PDF (16/60 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
RED[2:0]
GREEN[2:0]
16 bits
CET [3:0]
BLUE[2:0]
TT[2:0]
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ADDESS[7:0]
NEXT ADDESS[7:0]
16 bits
RED[2:0]
GREEN[2:0] CET[3:2]
16 bits
CET[1:0] BLUE[2:0]
TT[2:0]
COMMAND REGISTER WITH 8 COMMANDS
COMMAND 1
COMMAND 2
COMMAND 3
COMMAND 4
COMMAND 5
COMMAND 6
COMMAND 7
COMMAND 8
ADDRESS 50H
R2
R1
R0
G2
G1
G0
CET3 CET2
ADDRESS 51H
CET1
CET0
B2
B1
B0
TT2
TT1
TT0
ADDRESS 52H
R2
R1
R0
G2
G1
G0
CET3 CET2
ADDRESS 53H
CET1
CET0
B2
B1
B0
TT2
TT1
TT0
ADDRESS 54H
R2
R1
R0
G2
G1
G0
CET3 CET2
ADDRESS 55H
CET1
CET0
B2
B1
B0
TT2
TT1
TT0
ADDRESS 56H
R2
R1
R0
G2
G1
G0
CET3 CET2
ADDRESS 57H
CET1
CET0
B2
B1
B0
TT2
TT1
TT0
ADDRESS 58H
R2
R1
R0
G2
G1
G0
CET3 CET2
ADDRESS 59H
CET1
CET0
B2
B1
B0
TT2
TT1
TT0
ADDRESS 5AH
R2
R1
R0
G2
G1
G0
CET3 CET2
ADDRESS 5BH
CET1
CET0
B2
B1
B0
TT2
TT1
TT0
ADDRESS 5CH
R2
R1
R0
G2
G1
G0
CET3 CET2
ADDRESS 5DH
CET1
CET0
B2
B1
B0
TT2
TT1
TT0
ADDRESS 5EH
R2
R1
R0
G2
G1
G0
CET3 CET2
ADDRESS 5FH
CET1
CET0
B2
B1
B0
TT2
TT1
TT0
COLOR INTENSITY CONTROL
Each color, Red, Green and Blue, has 3-bit intensity levels. The level control is logarithmic. 2 logarithmic curves
are available. The LOG bit in Pattern_gen_ctrl register (11H) defines the curve used. The values for both
logarithmic curves are shown in following table.
R[2:0], G[2:0],
B[2:0]
000
001
010
011
100
101
110
111
CURRENT
[% × I_MAX(COLOR)]
LOG=0
LOG=1
0
0
7
1
14
2
21
4
32
10
46
21
71
46
100
100
16
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