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参数资料
| 型号： | SC668ULTRT |
| 厂商： | Semtech |
| 文件页数： | 38/46页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR LMU 8CH MLPQUT20 |
| 特色产品： | Semtech sc667 and sc668 |
| 标准包装： | 1 |
| 拓扑： | 线性（LDO），PWM |
| 输出数： | 12 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，LED 闪烁器，照明管理装置（LMU） |
| 频率： | 400kHz |
| 电源电压： | 2.9 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-UFQFN 裸露焊盘 |
| 供应商设备封装： | 20-MLPQ（3x3） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC668ULDKR |
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SC668
Register Map (continued)
Lighting Effects Assignment Register (0Eh)
This register is used to assign the backlight LEDs to four
banks, bank #1, bank #2, bank #3, and bank #4. This regis-
ter is also used to assign the banks to two groups, group
#1 and group #2. Group #1 and group #2 are assigned
independently to a lighting effect and an effect rate, as
described in the next section, Effect Rate Options.
GRP1 and GRP0 [D4:D3]
These bits are used to assign banks into two groups of
Effect Rate Options (0Fh)
This register is used to set the effects rate for the fade and
breathe effects. Different effect rates may be applied to
group #1 and group #2.
ER2_2, ER2_1, and ER2_0 [D5:D3]
Banks assigned to group #2 will step through settings at
the rate shown in Table 16.
Table 16 — Effect Rates for Group #2
independent lighting effects and effect rates. The group
assignments are shown in Table 14.
ER2_2
ER2_1
ER2_0
Breathe Rate
(ms?step)
Fade Rate
(ms?step)
GRP0
GRP1
0
0
1
1
Table 14 — Lighting Effect Assignments
Bank(s) Assigned Bank(s) Assigned
Group #1 to Group #2
0 #1 #2, #3, and #4
1 #1 and #2 #3 and #4
0 #1, #2, and #3 #4
1 #1,# 2, #3, and #4 no banks assigned
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
snap to target
4
8
16
24
32
48
64
snap to target
1
2
4
6
8
12
16
BANK2, BANK1, and BANK0 [D2:D0]
These bits provide bank assignments for all backlight
LEDs. Backlight bank assignments are shown in Table 15.
The table shows the backlight pins assigned to each of the
ER1_2, ER1_1, and ER1_0 [D2:D0]
Banks assigned to group #1 will step through settings at
the rate shown in table 17.
ER1_1
ER1_0
four banks, as assigned by the data bits BANK2, BANK1,
and BANK0.
Table 15 — Backlight Bank Assignments
ER1_2
Table 17 — Effect Rates for Group #1
Breathe Rate Fade Rate
(ms?step) (ms?step)
Bank
#4
Bank
#3
Bank
#2
Bank
#1
0
0
0
0
0
1
0
1
0
snap to target
4
8
snap to target
1
2
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
-
-
-
-
-
-
-
-
BL1
-
-
BL1
BL1 - BL2
BL2
BL1 - BL3
BL1 - BL8
BL2 - BL8
BL3 - BL8
BL3 - BL8
BL4 - BL8
0
1
1
1
1
1
0
0
1
1
1
0
1
0
1
16
24
32
48
64
4
6
8
12
16
1
1
1
0
1
1
1
0
1
BL1
BL1
BL1
BL2
BL2
BL2
BL3
BL3 - BL4
BL3 - BL5
BL4 - BL8
BL5 - BL8
BL6 - BL8
38
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