AS3676 datasheet(2/92 Pages) AMSCO

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AS3676

Flexible Lighting Management (CP, DCDC, 13 Current Sinks,

ADC, LED Test, LDO, DLS and Ambient Light sensing)

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Datasheet

1 General Description

The AS3676 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 AS3676 incorporates one Step Up DC/DC Con-

verter 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 Lumi-

nance 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.

2 Key Features



High-Efficiency Step Up DC/DC Converter

- Up to 26V/50mA 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 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 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 Pre-

view 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 process-

ing 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

- 27µs 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 sup-

ply 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

- 3µA 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

3 Applications

Power- and lighting-management for mobile telephones

and other 1-cell Li+ or 3-cell NiMH powered devices.

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