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AS3688 Preliminary Product Brief, Confidential
austriamicrosystems
Preliminary Product Brief, Confidential Preliminary Datasheet,
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). 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 - 27s 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 - 3A 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 -
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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 - 3A 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 (0.5 typ. 1 max. in 1:1 mode, 1.4 typ. 2 max. in 1:1.5) - Only 4 External Capacitors Required: 2 x 1F Flying Capacitors, 2 x 2.2F - 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
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3 Application
Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices.
www.austriamicrosystems.com (ptr)
Revision 0.1 / 20051205
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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_P (CURR42) SENSE_N (CURR43) C2 1F
L1 10H
AS3688 Lighting Management Unit
Battery LED Test
D1 C9 4.7F
3 x 0.15-38.5mA Current Sinks (Alternative Function) Step Up DC/DC Converter DCDC_GATE Q1 DCDC_FB (CURR41) R4 100k Battery VBAT1 R3 1M C10 1.5nF
VBAT3 LDO VANA1 e.g. 2.8V C3 2.2F VANA1
LDO VANA1 1.85-3.4V 150mA
C11 15nF
LDO VANA2 1.85-3.4V 150mA V2_5 Charge Pump References and Temperature Supervision 1:1, 1:1.5, 1:2 400mA / 900mA
VBAT2 C2_P C2_N C1_P C1_N CPOUT C7 2.2F D10 White LEDs, Backlight C5 2.2F D7 C6 2.2F D8 D9 D11 D12
C4 1F R1 220k
RBIAS
CREF C1 100nF
OLED Charge Pump (Alternative Function) Battery or CPOUT Current Sinks 0.15-38.5mA RGB1
C8 2.2F Current Sinks each 0.6-300mA D3 CURR30 CURR31 CURR32 D4 D5 D6
RGB2 CURR33 RGB3 (VANA2) D13,D14,D15 LDO VANA2 e.g. 2.8V C12 2.2F 8Bit PWM Generator Automatic Dimming and LED Pattern Generator V2_5 Vtemp GPIO/ ADC Strobe Preview Timer Serial Interface
Current Sinks each 0.15-38.5mA CURR1
CURR2
CLK DATA
CLK
VDD_GPIO R5 1-10k DATA
GPIO0 GPIO1
GPIO2
GPI
VDD_GPIO
R6
www.austriamicrosystems.com (ptr)
Revision 0.1 / 20051205
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AS3688 Preliminary Product Brief, Confidential
austriamicrosystems
Copyright
Copyright (c) 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, AustriaEurope. Trademarks Registered (R). 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 Premstatten, 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
austriamicrosystems
www.austriamicrosystems.com (ptr)
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