AS3688 Preliminary Product Brief, Confidential austriamicrosystems Preliminary Preliminary Product Datasheet, Brief, Confidential AS3688 Flexible Lighting Management (Charge Pump, DCDC Step Up, Current Sink, ADC, LDO) 1 General Description The AS3688 is a highly-integrated CMOS Power and Lighting Management Unit to supply power to LCD-and cameramodules in mobile telephones, and other 1-cell Li+ or 3-cell NiMH powered devices. The AS3688 incorporates one low-power, lowdropout regulator (LDO), one Step Up DC/DC Converter for white backlight LEDs, one high-power Charge Pump for camera flash LEDs, one Analogto-Digital Converter, support for up to 11 current sinks, a two wire serial interface, and control logic all onto a single device. Output voltages and output currents are fully programmable. The AS3688 is a successor to the austrimicrosystems AS3681 with several additional features (Charge Pump Automatic Up Switching, Extended timer features, autonomous logarithmic PWM dimming, LED pattern generator, DCDC step up overvoltage protection, improved Charge Pump and a fourth high current sink). − − − 2 Key Features New features of the AS3688 compared to the AS3681 are written in boldface italics. Programmable High-Performance Regulator − Low-Noise LDO (1.85 to 3.4V, 150mA) − Default off after Power-up − 3µA Quiescent Current in Standby − Programmable via Serial Interface High-Efficiency Step Up DC/DC Converter − Up to 25V/50mA for White LEDs − Programmable Output Voltage with External Resistors and Serial Interface − Overvoltage Protection − 0.1Ohm Shunt Resistor High-Efficiency High-Power Charge Pump − 1:1, 1:1.5, and 1:2 Mode − Automatic Up Switching (can be disabled and 1:2 mode can be blocked) − Output Current up to 400mA / 900mA pulsed − Efficiency up to 95% − Very Low effective Resistance (0.5Ω typ. 1Ω max. in 1:1 mode, 1.4Ω typ. 2Ω max. in 1:1.5) − Only 4 External Capacitors Required: 2 x 1µF Flying Capacitors, 2 x 2.2µF − Supports LCD White Backlight LEDs, − Camera Flash White LEDs, and Keypad Backlight LEDs Supports up to 12 Current Sinks − Four Programmable (8+1Bit) from: 0.6mA to 300mA www.austriamicrosystems.com (ptr) Two High Voltage Programmable (8-bit) from: 0.15mA to 38.25mA − Three Programmable (8-bit) from: 0.15mA to 38.25mA for RGB LEDs − Three Programmable (8-bit) from: 0.15mA to 38.25mA for General Purpose − Programmable Hardware Control (Strobe, and Preview or PWM) − Selectively Enable/Disable Current Sinks Internal PWM Generation 8 Bit resolution Logarithmic up/down dimming Led Pattern Generator Autonomous driving for Fun RGB LED 10-bit Successive Approximation ADC − 27µs Conversion Time − Four Selectable Inputs: GPIO0-3 − Internal Temp. Measurement − Support for Light Sensor, inluding a adjustable current source (0-15uA) Support for automatic LED function testing (open and shorted LEDs can be identified) Support for external Temperature Sensor for high current LED protection (CURR3x) Strobe Timeout protection Up to 1600ms Three different timing modes TXMask function (reduce current during Strobe) selectable on pin GPIO1 Four General Purpose Inputs/Outputs GPIO0-2 Input/Output, GPI only Input − Digital Input, Digital Output, and Tristate − Programmable Pull-Up, and Pull-Down − GPI can be used as Flash Strobe − GPIO2 can be used for Preview Mode − GPIO0/2 can used for PWM input Negative or High-Voltage Charge Pump − Regulated Output Voltage, Programmable by Dual Resistors e.g. -6V, 10mA for OLED or ±15V, 5mA for TFT − ±5% Accuracy Standby LDO always on − Regulated 2.5V max. output 10mA − 3µA Quiescent Current Wide Battery Supply Range: 3.0 to 5.5V Two Wire Serial Interface Control Overcurrent and Thermal Protection Package QFN32 5x5mm or CSP 3x3mm − − − − 3 Application Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices. Revision 0.1 / 20051205 1-3 AS3688 Preliminary Product Brief, Confidential austriamicrosystems 4 Block Diagram Figure 1 – Application Diagram of the AS3688: Option shown: Step up DCDC converter, RGB Current Sinks Battery R2 SENSE_N (CURR43) SENSE_P (CURR42) AS3688 Lighting Management Unit Battery LDO VANA1 e.g. 2.8V L1 10µH Step Up DC/DC Converter DCDC_GATE R3 1M C10 1.5nF R4 100k C11 15nF C9 4.7µF Q1 DCDC_FB (CURR41) LDO VANA1 1.85-3.4V 150mA VANA1 D1 3 x 0.15-38.5mA Current Sinks (Alternative Function) LED Test VBAT3 C2 1µF Battery VBAT1 C3 2.2µF LDO VANA2 1.85-3.4V 150mA VBAT2 C5 2.2µF C2_P C4 1µF References and Temperature Supervision RBIAS R1 220k D7 Charge Pump V2_5 CREF 1:1, 1:1.5, 1:2 C2_N 400mA / 900mA C1_P C6 2.2µF D9 C7 2.2µF C1_N C1 100nF D8 D10 D11 D12 White LEDs, Backlight CPOUT C8 2.2µF OLED Charge Pump (Alternative Function) Current Sinks each 0.6-300mA Battery or CPOUT D3 D4 D5 D6 CURR30 Current Sinks 0.15-38.5mA CURR31 RGB1 CURR32 RGB2 CURR33 RGB3 (VANA2) D13,D14,D15 LDO VANA2 e.g. 2.8V C12 2.2µF Current Sinks each 0.15-38.5mA 8Bit PWM Generator Automatic Dimming and LED Pattern Generator CURR1 CURR2 V2_5 Vtemp GPIO/ ADC Strobe Preview Timer CLK Serial Interface GPIO0 GPIO1 GPIO2 GPI DATA CLK VDD_GPIO R5 1-10k DATA VDD_GPIO R6 www.austriamicrosystems.com (ptr) Revision 0.1 / 20051205 2-3 AS3688 Preliminary Product Brief, Confidential austriamicrosystems Copyright Copyright © 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, AustriaEurope. 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Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters: austriamicrosystems AG Business Unit Communications A 8141 Schloss Premstätten, Austria T. +43 (0) 3136 500 0 F. +43 (0) 3136 5692 [email protected] For Sales Offices, Distributors and Representatives, please visit: www.austriamicrosystems.com austriamicrosystems www.austriamicrosystems.com (ptr) – a leap ahead Revision 0.1 / 20051205 3-3