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 AS3688 austriamicrosystems Datasheet, Confidential Datasheet, Confidential AS3688 Flexible Lighting Management Unit (Charge Pump, DCDC Step Up, Current Sink, ADC, LDO) 1 General Description Three Programmable (8-bit) from: 0.15mA The AS3688 is a highly-integrated CMOS Power to 38.25mA for RGB LEDs and Lighting Management Unit to supply power to Three (AS3688B only AS3688: One) LCD-and cameramodules in mobile telephones, and Programmable (8-bit) from: 0.15mA to other 1-cell Li+ or 3-cell NiMH powered devices. 38.25mA for General Purpose The AS3688 incorporates one low-power, low- Programmable Hardware Control (Strobe, dropout regulator (LDO), one Step Up DC/DC and Preview or PWM) Converter for white backlight LEDs, one high-power Selectively Enable/Disable Current Sinks Charge Pump for camera flash LEDs, one Analog- Internal PWM Generation to-Digital Converter, support for up to 11 current 8 Bit resolution sinks, a two wire serial interface, and control logic Logarithmic up/down dimming all onto a single device. Fully programmable. Led Pattern Generator The AS3688 is a successor to the Autonomous driving for any LED austrimicrosystems AS3681 with several additional 10-bit Successive Approximation ADC features (Charge Pump Automatic Up Switching, 27s Conversion Time Extended timer features, autonomous logarithmic Four Selectable Inputs: GPIO0-3 PWM dimming, LED pattern generator, DCDC step Internal Temp. Measurement up overvoltage protection, improved Charge Pump Support for Light Sensor, inluding a and a fourth high current sink). adjustable current source (0-15uA) Support for automatic LED function testing 2 Key Features (open and shorted LEDs can be identified) New features of the AS3688 compared to the Support for external Temperature Sensor AS3681 are written in boldface italics. for high current LED protection (CURR3x) Programmable High-Performance Regulator Strobe Timeout protection Low-Noise LDO (1.85 to 3.4V, 150mA) Up to 1600ms Default off after Power-up Three different timing modes 3A Quiescent Current in Standby TXMask function (reduce current during Programmable via Serial Interface Strobe) selectable on pin GPIO1 High-Efficiency Step Up DC/DC Converter Four General Purpose Inputs/Outputs Up to 25V/50mA for White LEDs GPIO0-2 Input/Output, GPI only Input Programmable Output Voltage with Digital Input, Digital Output, and Tristate External Resistors and Serial Interface Programmable Pull-Up, and Pull-Down Overvoltage Protection GPI can be used as Flash Strobe 0.1Ohm Shunt Resistor GPIO2 can be used for Preview Mode High-Efficiency High-Power Charge Pump GPIO0/2 can used for PWM input 1:1, 1:1.5, and 1:2 Mode Negative or High-Voltage Charge Pump Automatic Up Switching (can be Regulated Output Voltage, Programmable disabled and 1:2 mode can be blocked) by Dual Resistors e.g. -6V, 10mA for Output Current up to 400mA / 900mA OLED or 15V, 5mA for TFT pulsed 5% Accuracy Efficiency up to 95% Standby LDO always on Very Low effective Resistance (0.5 typ. Regulated 2.5V max. output 10mA 1 max. in 1:1 mode, 1.4 typ. 2 max. 3A Quiescent Current in 1:1.5) Wide Battery Supply Range: 3.0 to 5.5V Only 4 External Capacitors Required: Two Wire Serial Interface Control 2 x 1F Flying Capacitors, 2 x 2.2F Overcurrent and Thermal Protection Package QFN32 5x5mm Supports LCD White Backlight LEDs, Camera Flash White LEDs, and Keypad 3 Application Backlight LEDs Supports up to 12 Current Sinks Power- and lighting-management for mobile Four Programmable (8+1Bit) from: 0.6mA telephones and other 1-cell Li+ or 3-cell NiMH to 300mA powered devices. Two High Voltage Programmable (8-bit) from: 0.15mA to 38.25mA www.austriamicrosystems.com (ptr,tje) Revision 1.1.1 / 20060707 1 - 70 ams AG Technical content still valid