AS3689 AMSCO | Alldatasheet
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AS3689 a u s t r i a m i c r o s y s t e m s Preliminary Product Brief, Confidential www.austriamicrosystems.com (ptr) Revision 1.0 / 200 51205 1 - 3
1 General Description
The AS3689 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 AS3689 incorporates one low-power, low- dropout regulator (LDO), one Step Up DC/DC Converter for white backlight LEDs, one high-power Charge Pump for camera flash LEDs, one Analog- to-Digital Converter, support for up to 11 current sinks, a two wire serial interface, and control log ic all onto a single device. Output voltages and outp ut currents are fully programmable. The AS3689 is a successor to the austrimicrosystems AS3681 with several additional features (Charge Pump Automatic Up Switching, Extended timer features, autonomous logarithmic and linear PWM dimming, LED pattern generator, DCDC step up overvoltage protection, improved Charge Pump and a fourth high current sink).
2 Key Features
/square4 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 /square4 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 − Efficiency up to 95% − Very Low effective Resistance (0.5 Ω typ. 1Ω max. in 1:1 mode, 1.8 Ω typ. in 1:1.5) − Only 4 External Capacitors Required: 2 x 1µF Flying Capacitors, 2 x 2.2µF Input/Output Capacitors − Supports LCD White Backlight LEDs, − Camera Flash White LEDs, and Keypad Backlight LEDs /square4 Supports up to 15 Current Sinks − Four Programmable ( 6-Bit ) from: 0.6mA to 37.8mA − Two Programmable ( 8-bit ) from: 0.15mA to 38.5mA − Three High Voltage Programmable ( 8-bit ) from: 0.15mA to 38.5mA (Keyboard LEDs) − Six Programmable ( 8-bit ) from: 0.15mA to 38.5mA (2 RGB LEDs) − Programmable Hardware Control (Strobe, and Preview or PWM) − Selectively Enable/Disable Current Sinks /square4 Internal PWM Generation − 8 Bit resolution − Logarithmic up/down dimming /square4 Led Pattern Generator − Autonomous driving for Fun RGB LEDs /square4 10-bit Successive Approximation ADC − 27µs Conversion Time − Selectable Inputs: GPIO, GPI, all current sources, VBAT, CP_OUT, DCDC_FB − Internal Temp. Measurement − Light Sensor, inluding a adjustable current source (0-15uA) to V2_5 /square4 Support for automatic LED testing (open and shorted LEDs can be identified) /square4 Support for external Temperature Sensor for high current LED protection (CURR3x) /square4 Strobe Timeout protection − Up to 1600ms − Three different timing modes /square4 2 General Purpose Inputs/Outputs − GPIO Input/Output, GPI only Input − Digital Input, Digital Output, and Tristate − Programmable Pull-Up, and Pull-Down − GPI can be used as Flash Strobe − GPIO can be used for Preview Mode − GPIO can be used as PWM input /square4 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 /square4 Programmable LDO (shared with RGB3) − 1.85 to 3.4V, 150mA − Programmable via Serial Interface /square4 Standby LDO always on − Regulated 2.5V max. output 10mA − 3µA Quiescent Current /square4 Wide Battery Supply Range: 3.0 to 5.5V /square4 Two Wire Serial Interface Control /square4 Overcurrent and Thermal Protection /square4 Package: CSP 3 x 3 mm
3 Application
Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices. Preliminary Product Brief, Confidential AS3689 Flexible Lighting Management (Charge Pump, DCDC Step Up, Current Sink, ADC, LDO)
AS3689 a u s t r i a m i c r o s y s t e m s Preliminary Product Brief, Confidential www.austriamicrosystems.com (ptr) Revision 1.0 / 200 51205 2 - 3
4 Block Diagram
Figure 1 – Application Diagram of the AS3689 Step Up DC/DC Converter 4.7µF C10 1.5nF SENSE_N DCDC_GATE DCDC_FB 100k C11 15nF 1µF Battery SENSE_P Charge Pump 1:1, 1:1.5, 1:2 400mA Battery VBAT1 C2_P 1µF 1µF C2_N C1_P 1µF C1_N CPOUT D2 D3 D4 2.2µF CURR30 CURR31 CURR32 Current Sinks each 0.6-37.8mA D10 D12 D11 CURR1 CURR2 HV Current Sinks each 0.15-38.5mA Serial Interface 1-10k VDD_GPIO CLK CLK DATA GPIO/ ADC V2_5 GPIO GPI VDD_GPIO References and Temperature Supervision 1µF 220k Battery VBAT2 V2_5 RBIAS RGB1 RGB2 RGB3 (VANA) Current Sinks 0.156-40mA OLED Charge Pump (Alternative Function) Battery or CPOUT D17,D18,D19 10µH DATA AS3689 Lighting Management Unit 8Bit PWM Generator Automatic Dimming and LED Pattern Generator Vtemp Strobe Timer CURR33 C12 2.2µF LDO VANA e.g. 2.8V LDO 1.85-3.4V 150mA (Alternative Function) CURR41 CURR42 CURR43 VSS_CP Current Sinks 0.15-38.5mA D13 D15 D14 D16 CURR6 D20,D21,D22 Current Sinks each 0.15-38.5mA D6 D7 CURR51 CURR52 RGB1 RGB2 VSS VSS Battery or CPOUT LED Test
AS3689 a u s t r i a m i c r o s y s t e m s Preliminary Product Brief, Confidential www.austriamicrosystems.com (ptr) Revision 1.0 / 200 51205 3 - 3 Copyright Copyright © 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria- Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. 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 info@austriamicrosystems.com For Sales Offices, Distributors and Representatives, please visit: www.austriamicrosystems.com a u s t r i a m i c r o s y s t e m s – a leap ahead