AS3687 datasheet(2/55 Pages) AMSCO

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AS3687/87XM

Datasheet

www.austriamicrosystems.com/AS3687

(mlg/ptr)

1v3-4

1 - 54

General Description

The AS3687/87XM is a highly-integrated CMOS

Lighting Management Unit for mobile telephones,

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

devices.

The AS3687/87XM incorporates one Step Up

DC/DC Converter for white backlight LEDs, one low

noise Charge Pump for indicator- or RGB- LEDs,

LED test circuit (production test of the soldered

LEDs at the customer site), one Analog-to-Digital

Converter, seven current sinks, a two wire serial

interface, and control logic all onto a single device.

Output voltages and output currents are fully

programmable. The AS3687XM has an audio input

to control one or two RGB LEDs.

The

AS3687/87XM

successor

the

austrimicrosystems AS3689 and therefore software

compatible

to the AS3689 (software written for the

AS3689

can

easily

reused

for

the

AS3687/87XM).

Key Features

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

High-Efficiency Low Noise 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 150mA

−

Efficiency up to 95%

−

Only 4 External Capacitors Required:

2 x 500nF Flying Capacitors, 2 x 1µF

Input/Output Capacitors

−

Supports LCD White Backlight or RGB

LEDs

Seven Current Sinks

−

All seven current sinks fully Programmable

(8-bit) from: 0.15mA to 38.5mA (CURR1,

CURR2, CURR6, CURR30, CURR31,

CURR32, CURR33)

−

Three current sinks are High Voltage

capable (CURR1, CURR2, CURR6)

−

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: all current sources,

VBAT, CP_OUT, DCDC_FB

−

Internal Temp. Measurement

Support for automatic LED testing (open and

shorted LEDs can be identified in-circuit)

Standby LDO always on if serial interface is on

−

Regulated 2.5V max. output 10mA

−

3µA Quiescent Current

−

Automatic wakeup if serial interface is

enabled (allows ultra low power for device

shutdown)

Audio can be used to drive RGB LED

(AS3687XM only)

−

RGB Color and Brightness is dependent

on audio input amplitude

−

Can drive one or two RGB LEDs

Wide Battery Supply Range: 3.0 to 5.5V

Two Wire Serial Interface Control

Overcurrent and Thermal Protection

Small Package

WL-CSP 4x5 balls 0.5mm pitch

3 Application

Lighting-management for mobile telephones and

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

AS3687/87XM

Flexible Lighting Management (Charge Pump, DCDC Step

Up, Seven Current Sinks, ADC, LED Test, Audio Light)

Datasheet

AS3687 数据表(PDF) 2 Page - ams AG

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AS3687 数据表(PDF) 2 Page - ams AG

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