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LP3942 Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LP3942
Description  The Dual RGB LED Controller with 1.5x/2x Charge Pump and SPI Interface
PDF  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LP3942 Datasheet(HTML) 11 Page - National Semiconductor (TI)

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RGB Functionality (Continued)
20129209
RGB Framing with 50% Intensity
The brightness control is logarithmic and is programmed as
follows.
Bright
[2:0]
Color
Brightness
[%]
Ratio to
Max Brightness
000
0
0
001
1.56
1/64
010
3.12
1/32
011
6.25
1/16
100
12.5
1/8
101
25.0
1/4
110
50.0
1/2
111
100
1/1
Non-Overlapping Mode
The non-overlapping mode has 16-programmed colors (dif-
ferent R, G and B ratio
→ different color). Since the R, G and
B are split in to non-overlapping slots the output current
through the RGB LED can be calculated by following equa-
tion:
I
AVG =(CR*IR +CG*IG +CB*IB)*B,
C = Color [%] (see table below)
B = Brightness [%] (see table below)
The 16 colors can be selected as follows. Please note that
exact color depends on LED current and type.
Color[3:0]
Red
active/cycle [%]
Green
active/cycle [%]
Blue
active/cycle [%]
RGB Color
(depends on RGB LED type)
0000
100
0
0
red
0001
0
100
0
green
0010
0
0
100
blue
0011
50
50
0
yellow
0100
0
50
50
green/blue
0101
50
0
50
maroon
0110
33
33
33
white
0111
50
25
25
dark pink
1000
25
50
25
dark green
1001
25
25
50
lt blue
1010
75
25
0
lt orange
1011
75
0
25
orange
1100
0
75
25
lt green
1101
25
75
0
med green
1110
0
25
75
blue/green
1111
25
0
75
purple
www.national.com
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