ALED1642GWXTTR屬于集成電路（IC）的LED驅(qū)動器。由意法半導(dǎo)體集團(tuán)制造生產(chǎn)的ALED1642GWXTTRLED 驅(qū)動器器件屬于 LED 驅(qū)動器電源管理集成電路 (PMIC) 系列，可通過標(biāo)稱固定電壓的電源為負(fù)載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調(diào)節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪ζ骷ぷ鼽c(diǎn)進(jìn)行外部控制，可在照明應(yīng)用中用于實(shí)現(xiàn)調(diào)光功能。

描述 Description

The ALED1642GW is a monolithic, low voltage,

low current power 16-bit shift register designed for

LED panel displays. The ALED1642GW

guarantees 20 V output driving capability allowing

the user to connect several LEDs in series. In the

output stage, sixteen regulated current sources

provide from 3 mA to 40 mA constant current to

drive the LEDs. The current is programmed

through an external resistor and can be adjusted

by a 7-bit current gain register in two subranges.

The brightness can be adjusted separately for

each channel through 12/16-bit grayscale control.

Programmable turn-on and turn-off time (four

different values available) improves the low noise

generation performance of the system.

Open/short error detection mode is available in

the ALED1642GW. The auto power-shutdown

and auto power-on features (selectable) allow the

device to save power without external

intervention.

Thermal management includes an

overtemperature data alert and output thermal

shutdown (170 °C). The high clock frequency is

up to 30 MHz and it makes the device suitable for

high data rate transmission. A selectable gradual

output delay reduces the inrush current, whereas

the selectable SDO synchronization feature works

when the device is used in daisy-chain

configuration. The supply voltage range is

between 3 V and 5.5 V.

特性 Features

? AECQ100 qualification

? 16 constant current output channels

? Output current: from 3 mA to 40 mA

? Current programmable through external

resistor

? 7-bit global current gain adjustment in two

ranges

? 12/16-bit PWM grayscale brightness control

? Programmable output turn-on/off time

? Error detection mode (both open and shortedLED)

? Programmable shorted-LED detection

thresholds

? Auto power saving/auto-wakeup

? Selectable SDO synchronization on the CLK

falling edge

? Gradual output delay (selectable)

? Supply voltage: 3 V to 5.5 V

? Thermal shutdown and overtemperature alert

? Up to 30 MHz 4-wires interface

? 20 V current generator rated voltage

Applications

? Full color/monochrome displays

? Dashboard (backlighting led indicators)

? Automotive Interior lighting