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| 型号： | SC667ULTRT |
| 厂商： | Semtech |
| 文件页数： | 42/47页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR LMU 7CH MLPQUT20 |
| 特色产品： | Semtech sc667 and sc668 |
| 标准包装： | 1 |
| 拓扑： | 线性（LDO），PWM |
| 输出数： | 11 |
| 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： | SC667ULDKR |
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SC667
Register Map (continued)
The ALS comparator functions are shown in Table 23.
Table 23 — ALS Comparator Function (1)
Conditions AD OUT Effect on Bank #1
AD OUT > AD RISE Brightness changes to target value
AD OUT < AD FALL Brightness changes to start value
ADC Output and Threshold Register (13h)
This register contains the value AD OUT which is compared
with AD RISE and AD FALL . The contents of AD OUT may originate
automatically from the ADC, when the AD_EN bit is a logic
one. Alternatively, AD OUT may be written to the register via
the I 2 C interface when the AD_EN bit is a logic zero.
AD FALL ≤ AD OUT ≤ AD RISE
AD FALL ≥ AD RISE
Brightness does not change
Hysteresis between the rising and falling
thresholds is disabled and . . .
AD FALL → has no effect on brightness
AD O > AD RISE → brightness changes to
target value
When AD_EN = 1, the ADC receives its analog voltage
input signal from the external photo-detector circuit con-
nected to the ADI pin. V ADI is then converted into digital
and stored as the 8 bit word AD OUT . The reference voltage
for the ADC is provided internally by the output of LDO4
AD O < AD RISE → brightness changes to
start value
AD O = AD RISE → brightness does not change
Note:
1) When AD_AUTO bit is high.
The state diagram of Figure 29 shows how the ADC is used
to change the brightness of backlight bank #1. No auto-
matic change in brightness occurs when AD_AUTO = 0.
AD OUT < AD RISE
AD_AUTO = 1 or 0
Bank #1 Brightness
= Value of Register 02h
(V LDO4 ). When the voltage V ADI is equal to V LDO4 , the ADC is
at full-scale value FFh, and AD OUT will equal FFh.
When using an external photo-detection circuit, the ADC
requires the LDO output voltage V LDO4 to remain constant.
V LDO4 can drop-out if the supply voltage becomes too low.
V LDO4 should be set to a value sufficiently low to guard
against drop-out.
To prevent drop-out, the maximum LDO4 output setting
should be limited to: V LDO4(MAX) = V IN(MIN) - [1.33 × I LDO4(MAX) ],
where V IN(MIN) is the minimum battery voltage and I LDO4(MAX)
is the maximum load current of LDO4. LDO4 load current
includes current to the external photo-detection circuit.
AD_O7 through AD_O0 [D7:D0]
These are the 8 bits of AD OUT . AD_O7 [D7] is the Most
Significant Bit (MSB), and AD_O0 [D0] is the Least
Significant Bit (LSB). Binary weights of these bits are
AD_AUTO = 1
AD OUT < AD FALL
AD_AUTO = 0
AD OUT < AD FALL
AD_AUTO = 0
AD OUT > AD RISE
AD_AUTO = 1
AD OUT > AD RISE
shown in Table 24.
Table 24 — AD OUT Bits [D7:D0]
Name
Bit Binary Weight
AD_O7
D7
1/2
Bank #1 Brightness
= Value of Register 06h
AD OUT > AD FALL
AD_AUTO = 1 or 0
AD_O6
AD_O5
AD_O4
AD_O3
AD_O2
AD_O1
AD_O0
D6
D5
D4
D3
D2
D1
D0
1/4
1/8
1/16
1/32
1/64
1/128
1/256
Figure 29 — ADC function at Bank #1 Brightness
42
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC668 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:8 LED Light Management Unit Automatic Dropout Prevention , Ambient Light Sense Input, PWM Dimming, and 4 LDOs |
| SC668EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:8 LED Light Management Unit Automatic Dropout Prevention , Ambient Light Sense Input, PWM Dimming, and 4 LDOs |
| SC668ULTRT | 功能描述:IC LED DRVR LMU 8CH MLPQUT20 RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 特色产品:LM3445 TRIAC Dimmable LED Driver 标准包装:55 系列:PowerWise® 恒定电流:是 恒定电压:- 拓扑:PWM，降压（降压） 输出数:1 内部驱动器:无 类型 - 主要:- 类型 - 次要:高亮度 LED（HBLED） 频率:30kHz ~ 1MHz 电源电压:8 V ~ 12 V 输出电压:- 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:管件 工作温度:-40°C ~ 125°C 产品目录页面:1285 (CN2011-ZH PDF) 其它名称:LM3445M |
| SC-67 | 制造商:JIFFY 功能描述:CORRUGATED BOX DW 24X18X18 PK15 制造商:JIFFY 功能描述:CORRUGATED BOX, DW, 24X18X18, PK15 |
| SC6750 | 制造商:Alltrade Tools LLC 功能描述:COMB. SET |
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