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SC668 Datasheet(PDF) 28 Page - Semtech Corporation

Part # SC668
Description  8 LED Light Management Unit Automatic Dropout Prevention , Ambient Light Sense Input, PWM Dimming, and 4 LDOs
PDF  46 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC668 Datasheet(HTML) 28 Page - Semtech Corporation

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SC668
28
Register Map (continued)
Bank #1 Backlight Register (02h)
This register is used to set the current for the backlight
LEDs in bank #1 and to enable the lighting effect feature
for bank #1. These backlights can be turned off using the
backlight enable bits of registers 00h and 01h. Writing the
0mA value into this register will also turn off the back-
lights, but only if the blink and breathe effects are
disabled.
B1FEN Bit D5
This bit works in conjunction with the B1BEN bit of register
06h to set a lighting effect for bank #1. Figure 20 shows
the lighting effects which are enabled by the combination
of B1FEN and B1BEN. When fade is enabled, fading will
occur in bank #1 each time the bank #1 current is changed,
enabled, or disabled. Blink and breathe functions run in a
continuous loop when they are enabled.
B1BEN = 0
B1FEN = 0
B1BEN = 0
B1FEN = 1
B1BEN = 1
B1FEN = 0
B1BEN = 1
B1FEN = 1
Fade
No Light Effect
Breathe
Bank #1
Blink
Figure 20 — Bank #1 Lighting Effect
IB1_4 through IB1_0 [Bits D4:D0]
These bits are used to set the current for the backlight
LEDs in bank #1. All bank #1 enabled current sinks will sink
the same current as shown in Table 2.
Table 2 — Bank #1 Backlight Current
IB1_4 IB1_3 IB1_2 IB1_1 IB1_0
Backlight
Current (mA)
0
0
0
0
0
0
0
0
0
0
1
0.05
0
0
0
1
0
0.1
0
0
0
1
1
0.2
0
0
1
0
0
0.5
0
0
1
0
1
1
0
0
1
1
0
1.5
0
0
1
1
1
2
0
1
0
0
0
2.5
0
1
0
0
1
3
0
1
0
1
0
3.5
0
1
0
1
1
4
0
1
1
0
0
4.5
0
1
1
0
1
5
0
1
1
1
0
6
0
1
1
1
1
7
1
0
0
0
0
8
1
0
0
0
1
9
1
0
0
1
0
10
1
0
0
1
1
11
1
0
1
0
0
12
1
0
1
0
1
13
1
0
1
1
0
14
1
0
1
1
1
15
1
1
0
0
0
16
1
1
0
0
1
17
1
1
0
1
0
18
1
1
0
1
1
19
1
1
1
0
0
20
1
1
1
0
1
21
1
1
1
1
0
23
1
1
1
1
1
25



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