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SC668 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC668 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 46 page  © 2010 Semtech Corporation POWER MANAGEMENT 1 SC668 8 LED Light Management Unit Automatic Dropout Prevention , Ambient Light Sense Input, PWM Dimming, and 4 LDOs SC668 2.9 to 5.5V IN ADI EN BYP LDO3 LDO4 GND LDO2 BL3 BL7 Ambient Light Sensor Device Enable BL1 LDO1 CIN CBYP C1 C2 C3 C4 PWM Backlight PWM SDA I2C Data SCL I2C Clock BL2 BL4 BL5 BL6 LDO1 LDO4 LDO3 LDO2 VIN RSDA RSCL VLDO4 VIN BL8 Typical Application Circuit May 24, 2010 Features Eight LED backlight sinks with 32 current settings from — 0mA to 25mA Up to four LED backlight banks Lighting effects — fade-in/fade-out, breathe, blink, auto-dim full, and auto-dim partial functions ADP (Automatic Dropout Protection) for backlights ALS (Ambient Light Sense) option sets the backlight brightness according to ambient lighting conditions I2C Bus fast mode and standard mode Backlight current accuracy — ± 1.5% typical Backlight current matching — ± 0.5% typical Four programmable 200mA low-noise LDO regulators PWM interface (200Hz to 50kHz) with internal digital low-pass filter Automatic sleep mode with all LEDs off Shutdown current — 0.1µA typical Ultra-thin package — 3 x 3 x 0.6 (mm) Lead-free and halogen-free WEEE and RoHS compliant Applications Cellular phones, smart phones, and PDAs LCD modules Portable media players and digital cameras Personal navigation devices Display/keypad backlighting and LED indicators Description The SC668 is a highly integrated light management unit that provides programmable current for up to eight LED current sinks. Four LED banks are provided to allow set- tings for various LED zones or indicators. Four low-noise LDOs with programmable outputs ranging from 1.2V to 3.3V and 200mA maximum output current are also included. ADP limits the maximum LED current to a level that ensures the LEDs maintain matched currents when the supply voltage approaches dropout. This feature produces accept- able light output at low supply voltage levels without requiring a boost converter or charge pump. Two interfaces are provided for design flexibility. 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 voltages. The PWM interface reduces the current setting for LED bank #1 by a factor equal to the duty cycle of the applied PWM signal. A filter at the PWM input converts the pulsed signal to a DC current level, resulting in less switching noise compared to pulsed current methods. The ADI input translates the voltage from an external ALS (Ambient Light Sensor) into a digitized code using a sigma- delta ADC. This block includes level detection to adjust the current setting of bank #1 with two different programmable levels based on the ambient light level. An interrupt output transitions low to notify the host processor that a level adjustment has been made. |
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