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| 型号： | SC668ULTRT |
| 厂商： | Semtech |
| 文件页数： | 14/46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
Applications Information (continued)
blink and breathe lighting effects. Details of the fade,
breathe, and blink effects are introduced later in this
Applications Information section.
Target Backlight Settings for Lighting Effects
The target backlight setting is the current which will result
at the end of a blink or breathe lighting effect cycle. The
Register Map contains four control registers which set the
target backlight currents for each bank. Registers 06h,
07h, 08h, and 09h contain the target current values for:
bank #1, bank #2, bank #3, and bank #4, respectively.
Bank #1 also uses the target value of register 06h in asso-
ciation with the ALS function. Bank #1 can be set to
automatically change to the target value of register 06h
when the ADC exceeds a programmable rising threshold.
ALS is defined in more detail under Ambient Light Sense,
and in the Register Map section under ADC Function
Register 12h.
Breathe Lighting Effect
The breathe lighting effect may be applied independently
to each group. When this feature is enabled, the bank ’s
backlight current will increase and decrease periodically
at a rate that mimics calm and smooth breathing. Once
initialized via the I 2 C interface, this function will run con-
tinuously, independent of the host processor, saving
instruction cycles and simplifying timing requirements.
Three timing parameters must be set to define the
breathe effect timing: effect rate, start time, and target
time. Group #1 and group #2 have independent timing
time parameter. When the start time has ended, the
breathe cycle begins again.
The breathe effect rate is programmable for group #1 and
group #2 and can be independently set to 4, 8, 16, 24, 32,
48, or 64ms for each group. Also, the start time and target
time parameters for group #1 and group #2 can be inde-
pendently set to 32, 64, 256, 512, 1024, 2048, 3072, or
4096ms.
In addition to the group’s timing parameters, start current
and target current values and BxBEN (blink/breathe enable)
and BxFEN (fade enable) bits are set for each bank to define
that bank’s min and max current during a breathe cycle
and enable the breathe function.
The five parameters that define the breathe effect are:
1. Effect rate — write value to register 0Fh
2. Start current — write value to register 02h, 03h, 04h,
or 05h (bank dependent)
3. Target current — write value to registers 06, 07h, 08h,
or 09h (bank dependent)
4. Start time — write value to register 10h or 11h (group
dependent)
5. Target time — write to register 10h or 11h (group
dependent
Figure 3 illustrates the breathe effect with respect to time.
For an example of the breathe effect, with bank #1
assigned to group #1, the terms used in the illustration
are as follows:
parameters to support a variety of options. When a bank
is assigned to a group, it adopts the timing parameters of
the respective group.
When enabled, the breathe function causes the back-
lights to change brightness by stepping the current
incrementally, using the effect rate parameter, until the
final backlight current is reached. The current will remain
at the target value for a time set by the target time param-
eter. When the target time has ended, the brightness will
again change, this time in reverse order, stepping the
?
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I BL_START = contents of register 02h (B1FEN must
equal 1)
I BL_TARGET = contents of register 06h (B1BEN must
equal 1)
t START = contents of bits ST1_[2:0] in register 10h
t TARGET = contents of bits TT1_[2:0] in register 10h
t BREATHE = breathe time. Equal to the breathe rate
times the number of steps between I BL_START and
I BL_TARGET . Breathe time is set with the bits ER1_
[2:0] in register 0Fh.
current incrementally, using the effect rate parameter,
until the current returns to the start value. The current
will remain at the start value for the time set by the start
Blink Lighting Effect
The blink lighting effect provides an automatic LED blink-
ing function that can be applied to a single LED driver or
14
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