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.

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