Datasheet > AAT2831

AAT2831

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		便携式便携式设备
页数	文件大小	规格书
21页	541K
描述
800mA Total Display Solution for Portable Devices

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AAT2831 数据手册

AAT2830/31

800mA Total Display Solution

for Portable Devices

Functional Block Diagram

C1+ C1– C2+ C2–

OUT

FL1

FL2

FL3

FL4

Tri-Mode Charge

Pump Control

Flash Ref

V_FMonitoring

PGND

BL1

BL2

AS²Cwire

Control

EN/SET

Main Ref

Sub Ref

BL3

BL4

BL5

BL6

DAC

BSET

RGB Ref

AGND

internal programmable timer. Maximum flash time

is set by an external capacitor, C_T. The RGB out-

puts can programmed with up to 4096 (AAT2830)

or 64 (AAT2831) different combinations of colors

and intensities. R, G, and B outputs are individually

controlled and can be used for alternative func-

tions, such as keyboard lighting, "fun" lights, etc.

Functional Description

The AAT2830/31 is a multi-function power solution

for display systems in portable devices. It includes

six individual driving channels for backlight LEDs,

four for flash LEDs, and three for RGB fashion or

auxiliary, or status LEDs. All of these functions are

engine that is capable of 800mA load current, ideal

for driving high brightness white LEDs.

The RGB channels can be programmed with up to

4096 or 64 different combinations of colors and light-

ing intensities (brightness). R, G, and B channels are

individually controlled and can be used for alternative

functions, such as keyboard lighting, "fun" lighting, etc.

The six backlight outputs can be turned on or off

together (BL1-BL6), in two groups or individually. The

two-group operation allows LEDs to be turned on and

off in two banks: the main group (BL1-BL4) and sub-

group (B5-B6) displays. An individual on/off feature

supports applications other than main/sub-display

backlights, such as keypad, navigate key, side key

backlight, and RGB LEDs. The maximum backlight

current is programmable with an external resistor.

AS Cwire Serial Interface

Each current channel input on the AAT2830/31 is

controlled by AnalogicTech's AS Cwire serial digital

interface. The AS Cwire interface uses the number of

rising edges on the EN/SET pin to address and load

the LED configuration registers. AS Cwire latches

The maximum flash current is set by the AS Cwire

data or addresses after the EN/SET pin has been

held logic high for longer than T_LAT(500µs).

Addresses and data are differentiated by the number

of EN/SET rising edges. Since the data registers are

interface, and the four flash LED outputs can be

turned on or off together (FL1-FL4) or as a group of

one (FL1) and three (FL2-FL4). The flash time can

either be controlled via the EN/SET pin or by an

4 bits each, the differentiating number of pulses is 2

2830.2007.09.1.0

1...6 7 8910 11 12...21

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