Aaustriamicrosystems AS3676 LED照明管理方案
Aaustriamicrosystems公司的 AS3676 是高度集成的CMOS功率和管理单元,适嗯移动手机或其它以一节锂离子电池或3节NiMH 电池供电的设备.它集成了一个用于白背景光的升压DC/DC转换器,一个大功率电荷泵,一个ADC,13个电流沉,LED功能测试,一个两线串行接口和控制逻辑.本文介绍了AS3676主要特性, 应用方框图, 模拟LDO方框图, 升压DC/DC转换器方框图, 环境光传感器内部电路图以及LED功能测试电路图, 自动控制LED内部电路图和外接元件列表.
AS3676 Flexible Lighting Management (CP, DCDC, 13 Current Sinks,ADC, LED Test, LDO, DLS and Ambient Light sensing)
The AS3676 is a highly-integrated CMOS Power and Lighting Management Unit for mobile tephones, and other 1-cell Li+ or 3-cell NiMH powered devices.
The AS3676 incorporates one Step Up DC/DC Converter for white backlight LEDs, one high-power Charge Pump, one Analog-to-Digital Converter, 13 current sinks, LED in-circuit function test, a two wire serial interface, and control logic all onto a single device. It supports ambient light sensor processing and a Dynamic Luminance Scaling (DLS) input. Output voltages and output currents are fully programmable.
The AS3676 is part of the austriamicrosystems AS3675, AS3687/87XM and AS3689 lighting management unit family. It is software compatible to AS3687/87XM and AS3689 and pin and software compatible to AS3675.
AS3676主要特性:
High-Efficiency Step Up DC/DC Converter
- Up to 26V/50mA for White LEDs
- Programmable Output Voltage with External Resistors and Serial Interface
- Over voltage Protection
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/500mA pulsed
- Efficiency up to 95%
- Very Low effective Resistance (2.5 typ. in 1:1.5)
- Only 4 External Capacitors Required:
2 x 1 F Flying Capacitors, 2 x 2.2 F Input/Output Capacitors
- Supports LCD White Backlight LEDs, or RGB LEDs
13 Current Sinks
- All 13 current sinks fully Programmable (8-bit) from: 0.15mA to 38.5mA (up to 75.6mA for
CURR30...CURR33)
- Three current sinks are High Voltage capable (CURR1, CURR2, CURR6)
- Programmable Hardware Control (Strobe, and Preview or PWM)
- Selectively Enable/Disable Current Sinks
- Dynamic Luminance Scaling (DLS) support to improve backlight operating time (can adjust any current source)
- Light Sensor input with internal hardware processing to control backlight according to ambient light using 3 groups - any current source can select one of the groups or no light sensor control
Internal PWM Generation
- 8 Bit resolution
- Autonomous Logarithmic up/down dimming
Led Pattern Generator
- Autonomous driving for Fun RGB LEDs
- Support indicator LEDs
10-bit Successive Approximation ADC
- 27 s Conversion Time
- Selectable Inputs: VANA/GPI, GPIO1/DLS, GPIO2/LIGHT, all current sources, VBAT, CPOUT, DCDC_FB
- Internal Temp. Measurement
- Light Sensor input with Java support (JSR-256): read ADC processed value
Support for automatic LED testing (open and shorted LEDs can be identified)
Strobe Timeout protection
- Up to 1600ms
- Three different timing modes
Two General Purpose Inputs/Output
- GPIO1/DLS, GPIO2/LIGHT
- Digital Input, Digital Output using VANA/GPI supply and Tristate
- GPIOs Programmable Pull-Up/Down
Programmable LDO
- 1.8 to 3.35V, 150mA
- Programmable via Serial Interface
Standby LDO always on
- Regulated 2.5V max. output 10mA
- 3 A Quiescent Current
Audio can be used to drive RGB LED(s)
- Color and Brightness depends on audio amplitude
Wide Battery Supply Range: 3.0 to 5.5V
Two Wire Serial Interface Control
Over current and Thermal Protection
WL-CSP30 3x2.5mm, 0.5mm pitch Package
AS3676应用:
Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices.
图1.AS3676方框图
图2.AS3676模拟LDO方框图
图3.AS3676升压DC/DC转换器方框图:电流反馈和过压保护
图4.AS3676升压DC/DC转换器详细方框图
图5.AS3676环境光传感器内部电路图
图6.AS3676 GPIO和VANA/GPI方框图
图7.AS3676 LED功能测试电路图
图8.AS3676自动控制LED内部电路图
外接元件列表:
AS3676 Flexible Lighting Management (CP, DCDC, 13 Current Sinks,ADC, LED Test, LDO, DLS and Ambient Light sensing)
The AS3676 is a highly-integrated CMOS Power and Lighting Management Unit for mobile tephones, and other 1-cell Li+ or 3-cell NiMH powered devices.
The AS3676 incorporates one Step Up DC/DC Converter for white backlight LEDs, one high-power Charge Pump, one Analog-to-Digital Converter, 13 current sinks, LED in-circuit function test, a two wire serial interface, and control logic all onto a single device. It supports ambient light sensor processing and a Dynamic Luminance Scaling (DLS) input. Output voltages and output currents are fully programmable.
The AS3676 is part of the austriamicrosystems AS3675, AS3687/87XM and AS3689 lighting management unit family. It is software compatible to AS3687/87XM and AS3689 and pin and software compatible to AS3675.
AS3676主要特性:
High-Efficiency Step Up DC/DC Converter
- Up to 26V/50mA for White LEDs
- Programmable Output Voltage with External Resistors and Serial Interface
- Over voltage Protection
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/500mA pulsed
- Efficiency up to 95%
- Very Low effective Resistance (2.5 typ. in 1:1.5)
- Only 4 External Capacitors Required:
2 x 1 F Flying Capacitors, 2 x 2.2 F Input/Output Capacitors
- Supports LCD White Backlight LEDs, or RGB LEDs
13 Current Sinks
- All 13 current sinks fully Programmable (8-bit) from: 0.15mA to 38.5mA (up to 75.6mA for
CURR30...CURR33)
- Three current sinks are High Voltage capable (CURR1, CURR2, CURR6)
- Programmable Hardware Control (Strobe, and Preview or PWM)
- Selectively Enable/Disable Current Sinks
- Dynamic Luminance Scaling (DLS) support to improve backlight operating time (can adjust any current source)
- Light Sensor input with internal hardware processing to control backlight according to ambient light using 3 groups - any current source can select one of the groups or no light sensor control
Internal PWM Generation
- 8 Bit resolution
- Autonomous Logarithmic up/down dimming
Led Pattern Generator
- Autonomous driving for Fun RGB LEDs
- Support indicator LEDs
10-bit Successive Approximation ADC
- 27 s Conversion Time
- Selectable Inputs: VANA/GPI, GPIO1/DLS, GPIO2/LIGHT, all current sources, VBAT, CPOUT, DCDC_FB
- Internal Temp. Measurement
- Light Sensor input with Java support (JSR-256): read ADC processed value
Support for automatic LED testing (open and shorted LEDs can be identified)
Strobe Timeout protection
- Up to 1600ms
- Three different timing modes
Two General Purpose Inputs/Output
- GPIO1/DLS, GPIO2/LIGHT
- Digital Input, Digital Output using VANA/GPI supply and Tristate
- GPIOs Programmable Pull-Up/Down
Programmable LDO
- 1.8 to 3.35V, 150mA
- Programmable via Serial Interface
Standby LDO always on
- Regulated 2.5V max. output 10mA
- 3 A Quiescent Current
Audio can be used to drive RGB LED(s)
- Color and Brightness depends on audio amplitude
Wide Battery Supply Range: 3.0 to 5.5V
Two Wire Serial Interface Control
Over current and Thermal Protection
WL-CSP30 3x2.5mm, 0.5mm pitch Package
AS3676应用:
Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices.
图1.AS3676方框图
图2.AS3676模拟LDO方框图
图3.AS3676升压DC/DC转换器方框图:电流反馈和过压保护
图4.AS3676升压DC/DC转换器详细方框图
图5.AS3676环境光传感器内部电路图
图6.AS3676 GPIO和VANA/GPI方框图
图7.AS3676 LED功能测试电路图
图8.AS3676自动控制LED内部电路图
外接元件列表:
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