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Datasheet
AS3675
Flexible Lighting Management Unit (Charge Pump, DCDC, 13 Current Sinks, ADC, LED Test, LDO, Audio Controlled Light)
1 General Description
The AS3675 is a highly-integrated CMOS Power and Lighting Management Unit for mobile telephones, and other 1-cell Li+ or 3-cell NiMH powered devices.
The AS3675 incorporates one Step Up DC/DC Converter for white backlight LEDs, one high-power Charge Pump, one Analog-to-Digital Converter, 13 current sinks, the RGB and white LEDs can be controlled by an audio input, LED in-circuit function test, a two wire serial interface, and control logic all onto a single device. Output voltages and output currents are fully programmable.
The AS3675 is part of to the austriamicrosystems AS3676, AS3687/87XM and AS3689 lighting mangement units family. It is software compatible to AS3687/ 87XM and AS3689 and pin and software compatible to AS3676.
2 Key Features
High-Efficiency Step Up DC/DC Converter
- Up to 16V/55mA (or 25V/35mA) for White LEDs - Programmable Output Voltage with External Resis-
tors 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 300mA/500mA pulsed - Efficiency up to 95% - Very Low effective Resistance (2.5Ω 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, 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 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 - 27µs Conversion Time - Selectable Inputs: GPIO, all current sources,
VBAT, CPOUT, DCDC_FB - Internal Temp. Measurement - Light Sensor input Support for automatic LED 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 Two General Purpose Inputs/Output - VANA/GPI Input, GPIO Input/Output - Digital Input, Digital Output using VANA/GPI sup-
ply and Tristate - VANA/GPI internal pull down - GPIO Programmable Pull-Up/Down Programmable LDO - 1.85 to 3.4V, 150mA - Programmable via Serial Interface Standby LDO always on - Regulated 2.5V max. output 10mA - 3µA Quiescent Current Audio can be used to drive RGB LED or up to four white LEDs - RGB Color and Brightness is dependent on audio
input amplitude or frequency White LEDs can be controlled by amplitude or frequency (different modes like bar-type or two and two LEDs driven by frequency filters) 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
3 Applications
Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices.
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Technical coantmesntAsGtill valid
AS3675
Datasheet - Applications
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Technical coantmesntAsGtill valid
AS3675
Datasheet - Applications
Contents
1 General Description ............................................................................................................................ 1 2 Key Features ....................................................................................................................................... 1 3 Applications ........................................................................................................................................ 1 4 Pinout .......................................................................