austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com Datasheet AS3676 Flexible Lighting Management (CP, DCDC, 13 Current Sinks, ADC, LED Test, LDO, DLS and Ambient Light sensing) 1 General Description - Light Sensor input with internal hardware process- The AS3676 is a highly-integrated CMOS Power and ing to control backlight according to ambient light Lighting Management Unit for mobile telephones, and using 3 groups - any current source can select one other 1-cell Li+ or 3-cell NiMH powered devices. of the groups or no light sensor control The AS3676 incorporates one Step Up DC/DC Con- Internal PWM Generation verter for white backlight LEDs, one high-power Charge - 8 Bit resolution Pump, one Analog-to-Digital Converter, 13 current sinks, - Autonomous Logarithmic up/down dimming LED in-circuit function test, a two wire serial interface, and control logic all onto a single device. It supports Led Pattern Generator ambient light sensor processing and a Dynamic Lumi- - Autonomous driving for Fun RGB LEDs nance Scaling (DLS) input. Output voltages and output - Support indicator LEDs currents are fully programmable. 10-bit Successive Approximation ADC The AS3676 is part of the austriamicrosystems AS3675, - 27s Conversion Time AS3687/87XM and AS3689 lighting management unit - Selectable Inputs: VANA/GPI, GPIO1/DLS, family. It is software compatible to AS3687/87XM and GPIO2/LIGHT, all current sources, VBAT, CPOUT, AS3689 and pin and software compatible to AS3675. DCDC FB - Internal Temp. Measurement - Light Sensor input with Java support (JSR-256): 2 Key Features read ADC processed value Support for automatic LED testing (open and High-Efficiency Step Up DC/DC Converter shorted LEDs can be identified) - Up to 26V/50mA for White LEDs Strobe Timeout protection - Programmable Output Voltage with External Resis- - Up to 1600ms tors and Serial Interface - Three different timing modes - Over voltage Protection Two General Purpose Inputs/Output High-Efficiency High-Power Charge Pump - GPIO1/DLS, GPIO2/LIGHT - 1:1, 1:1.5, and 1:2 Mode - Digital Input, Digital Output using VANA/GPI sup- - Automatic Up Switching (can be disabled and 1:2 ply and Tristate mode can be blocked) - GPIOs Programmable Pull-Up/Down - Output Current up to 400mA/500mA pulsed Programmable LDO - Efficiency up to 95% - 1.8 to 3.35V, 150mA - Very Low effective Resistance (2.5 typ. in 1:1.5) - Programmable via Serial Interface - Only 4 External Capacitors Required: Standby LDO always on 2 x 1F Flying Capacitors, 2 x 2.2F Input/Output Capacitors - Regulated 2.5V max. output 10mA - Supports LCD White Backlight LEDs, or RGB - 3A Quiescent Current LEDs Audio can be used to drive RGB LED(s) 13 Current Sinks - Color and Brightness depends on audio amplitude - All 13 current sinks fully Programmable (8-bit) Wide Battery Supply Range: 3.0 to 5.5V from: 0.15mA to 38.5mA (up to 75.6mA for Two Wire Serial Interface Control CURR30...CURR33) Over current and Thermal Protection - Three current sinks are High Voltage capable WL-CSP30 3x2.5mm, 0.5mm pitch Package (CURR1, CURR2, CURR6) - Programmable Hardware Control (Strobe, and Pre- 3 Applications view or PWM) - Selectively Enable/Disable Current Sinks Power- and lighting-management for mobile telephones - Dynamic Luminance Scaling (DLS) support to and other 1-cell Li+ or 3-cell NiMH powered devices. improve backlight operating time (can adjust any current source) www.austriamicrosystems.com/AS3676 1v1-4 1 - 91 (ptr) ams AG Technical content still valid