AS3665_04 datasheet(2/78 Pages) AMSCO

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Datasheet,Confidential

AS3665

9 Channel Advanced Command Driven RGB/White LED Driver

1 General Description

The AS3665 is a capacitive low noise charge pump with

9 current sources. The charge pump automatically

switches between 1:1 and 1:1.5 modes. The connected

current sources have a very low voltage compliance to

improve efficiency of the whole system. Three current

sources have the possibility to operate either from VBAT

or VCP (especially useful for red LEDs).

The internal control is done by command based pattern

generators implemented by three sequencers. These

commands are optimized for lighting applications (e.g.

ramp up brightness logarithmically). It includes high

level commands like conditionals jumps and variables.

Any of the three sequencers can be dynamically

mapped to any of the 9 PWM generators for the LEDs.

The AS3665 supports an audio input and sophisticated

light patterns can be controlled by internal digital filters.

The AS3665 is controlled by I

2C mode. Synchronization

over several AS3665 is possible by the TRIG pin.

The AS3665 is available in a space-saving WL-CSP-25

(2.610x2.675mm) 0.5mm pitch and operates over the -

30ºC to +85ºC temperature range.

Figure 1. Typical Operating Circuit

2 Key Features

High efficiency capacitive 150mA charge pump with

1:1, 1:1.5 and 1:2 modes with automatic mode

switching; 1:2 mode can be disabled

9 Channel High Side 20mA Current sources

- Less than 50mV at 10mA dropout voltage

- LED7,8,9 either powered by VBAT or VCP

Advanced Command based Pattern Generator

- 96 x 16 bits program memory

- Dedicated lighting commands like logarithmic fade

- Programming control and conditional jumps

Audio Controlled Lighting with internal digital filters

3 Sequencers

- Dynamically mapped to 9 PWM generators

- Internal/External Synchronization

9 PWM generators (12 bit resolution)

- Automatic RGB Color Correction by TAMB

2C interface with dedicated EN pin

Available in WL-CSP-25 (2.610x2.675mm) 0.5mm

pitch

3 Applications

RGB/White Fun or Event LED for mobile phones or por-

table devices; Lighting Management Unit

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