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SC667ULTRT

更新时间： 2024-09-19 06:10:19
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商升特 - SEMTECH /
页数 文件大小 规格书
47页 1003K
描述
7 LED Light Management Unit Automatic Dropout Prevention, Ambient Light Sense Input, PWM Dimming, and 4 LDOs

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SC667ULTRT 数据手册

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SC667  
7 LED Light Management Unit  
Automatic Dropout Prevention, Ambient Light  
Sense Input, PWM Dimming, and 4 LDOs  
POWER MANAGEMENT  
Features  
Description  
Seven LED backlight sinks with 32 current settings  
from 0mA to 25mA  
Up to four LED backlight banks  
The SC667 is a highly integrated light management unit  
that provides programmable current for up to seven LED  
current sinksꢀ Four LED banks are provided to allow set-  
tings for various LED zones or indicatorsꢀ Four low-noise  
LDOs with programmable outputs ranging from 1ꢀ2V to 3ꢀ3V  
and 200mA maximum output current are also includedꢀ  
Lighting effects — fade-in/fade-out, breathe, blink,  
auto-dim full, and auto-dim partial functions  
ADP (Automatic Dropout Prevention) for backlights  
ALS (Ambient Light Sense) option sets the backlight  
brightness according to ambient lighting conditions  
I2C Bus fast mode and standard mode  
IRQ (Interrupt request) — open-drain output indi-  
cates a change of state for the ALS  
Backlight current accuracy — 1ꢀ5ꢁ typical  
Backlight current matching — 0ꢀ5ꢁ typical  
Four programmable 200mA low-noise LDO regulators  
PWM interface (200Hz to 50kHz) with internal digital  
low-pass filter  
ADP limits the maximum LED current to a level that ensures  
the LEDs maintain matched currents when the supply  
voltage approaches dropoutꢀThis feature produces accept-  
able light output at low supply voltage levels without  
requiring a boost converter or charge pumpꢀ  
Two interfaces are provided for design flexibilityꢀ The I2C  
interface controls the LED on/off functions, assigns the  
LEDs to backlight banks, programs the LED currents, pro-  
grams the lighting effects, enables the LDOs, and sets the  
LDO output voltagesꢀ The PWM interface reduces the  
current setting for LED bank #1 by a factor equal to the duty  
cycle of the applied PWM signalꢀ A filter at the PWM input  
converts the pulsed signal to a DC current level, resulting in  
less switching noise compared to pulsed current methodsꢀ  
Automatic sleep mode with all LEDs off  
Shutdown current — 0ꢀ1µA typical  
Ultra-thin package — 3 x 3 x 0ꢀ6 (mm)  
Lead-free and halogen-free  
WEEE and RoHS compliant  
Applications  
The ADI input translates the voltage from an external ALS  
(Ambient Light Sensor) into a digitized code using a sigma-  
delta ADCꢀ This block includes level detection to adjust the  
current setting of bank #1 with two different programmable  
levels based on the ambient light levelꢀ An interrupt output  
transitions low to notify the host processor that a level  
adjustment has been madeꢀ  
Cellular phones, smart phones, and PDAs  
LCD modules  
Portable media players and digital cameras  
Personal navigation devices  
Display/keypad backlighting and LED indicators  
Typical Application Circuit  
VIN  
VIN  
CIN  
SC667  
2.9 to 5.5V  
IN  
BL1  
BL2  
GND  
BL3  
BL4  
BL5  
BL6  
BL7  
RSDA  
RSCL  
I2C Data  
I2C Clock  
SDA  
SCL  
VDD  
R1  
Backlight PWM  
Device Enable  
VLDO4  
PWM  
EN  
IRQ  
Flag for ALS  
LDO1  
LDO2  
LDO3  
LDO4  
LDO1  
LDO2  
LDO3  
LDO4  
ADI  
BYP  
CBYP  
C1  
C2  
C3  
C4  
Ambient Light Sensor  
May 21, 2010  
1
© 2010 Semtech Corporation  
1234567...47

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