AS3677 datasheet(2/68 Pages) AMSCO

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AS3677

Triple Channel Lighting Management Unit with DCDC step/up,

ALS, 2xDLS(=DBC) and RGB Driver

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Datasheet

1 General Description

The AS3677 is a highly-integrated CMOS Power and

Lighting Management Unit for mobile telephones, and

other Li+ battery powered devices.

The AS3677 incorporates one Step Up DC/DC Con-

verter for white backlight LEDs one Analog-to-Digital

Converter, six current sinks, LED in-circuit function test,

an I

2C serial interface, and control logic all onto a single

device. It includes a charge pump to control e.g. an RGB

together with an internal pattern generator for smooth

blinking effects.

It supports ambient light sensor processing and two

Dynamic Luminance Scaling (DLS) (also called

Dynamic Backlight Control - DBC) input.

Internally the PWM signal for DLS can be used to

change the analog current through the current sources

(two channels can be used simultaneously). This avoids

noise in the system as the changes of backlight control

happen continuously without using the PWM modulation

scheme.

Output voltages and output currents are fully program-

mable.

The AS3677 is part of the austriamicrosystems AS3675,

AS3687/87XM, AS3688 and AS3689 lighting manage-

ment unit family. It is software compatible to AS3675,

AS3676, AS3687/87XM, AS3688 and AS3689.

The AS3677 is available in a space-saving WL-CSP

package measuring only 2.2x2.2x0.6mm and operates

over the -30ºC to +85ºC temperature range.

Figure 1. Function Diagram

2 Key Features

High-Efficiency Step Up DC/DC Converter

- Up to 25V, up to 50mA for White LEDs

- Programmable Over voltage Protection

(10V, 16V or 25V)

50mA Charge Pump

- 1:1 and 1:2 Mode with automatic Up Switching

- Only 2 External Capacitors Required

6 Current Sinks

- Fully Programmable (8-bit) from: 0.1mA to 25.5mA

- 3xHigh Voltage capable (up to 25V)

- 3xLow voltage for use with the CP (up to 5.5V)

- Selectively Enable/Disable Current Sinks

- Dual 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

Internal PWM Generation

- 8 Bit resolution

- Autonomous Logarithmic up/down dimming

Led Pattern Generator

- Autonomous driving of Fun RGB or indicator LEDs

10-bit Successive Approximation ADC

- 27µs Conversion Time

- Selectable Inputs: VANA, DLS1, DLS2, ALS/

GPIO1, GPIO2, CURR1, CURR2, CURR6, VBAT,

RGB1, RGB2 and RGB3

- 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)

Programmable LDO

- 1.8 to 3.35V, 10mA

- Programmable via Serial Interface

Wide Battery Supply Range: 3.0V to 5.5V

2C Serial Interface Control with address control pin

Over current and Thermal Protection

Package

WL-CSP25, 2.2x2.2x0.6mm, 0.4mm pitch

3 Applications

Lighting Management Unit for mobile phones, smart-

phones, PMP or PND

AS3677

AS3677 数据表(PDF) 2 Page - ams AG

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