WS2821

Parallel-Single wire-Three channels

256 Gray level Constant current LED driven IC

http://www.world-semi.com

Main Features

 Signal adopts the single line parallel connection

type,any pixels’ failure won’t effect other pixel’s

display effect.

 Signal can compatible and expand the DMX512(1990)

protocol signal.

 Data transmission speed is 250Kbps~750Kbps.

 The built-in voltage regulator chip, 5V above 24V

power supply only series resistance to IC VDD feet,

without additional voltage regulator tube

 WS2821 IC has VR-tube(voltage-regulator tube)

built-in,for higher than 5V,lower than 24V’s power

supply,only require one resistor being series

connected to the IC’s VDD pin,no need to add the

VR-tube outside.

 Output voltage can bear 24V

 R/G/B out three channels’ output,each output driven

channel has PWM circuit to control the gray,256 gray

is adjustable

 R/G/B output default current 19mA,maximum 60mA.

 Storage space is built-in,support 1024

pixel’s parallel connection.

 Support

output

polarity

reversal

function.

Main Application

 LED full color exposed light string

 LED point light,LED module product

 LED decorative lighting system

 LED full color flexible strip

 Other LED decorate products,DMX

related products

General Description

WS2821 is a LED driven IC,which adopts the parallel single wire control signal,owns the independent

programmable address and large range programmable constant current,three channels output.

WS2821 has the power supply voltage stabilizing circuit,time base circuit,signal decoder block,data

buffer,built-in address storage circuit.

WS2821 is mainly designed for the indoor/outdoor LED project lighting and decorative LED lighting

system.

WS2821 owns three independent output driven channels,each channel can independent realize 256 gray

PWM control,it can control the LED 256 gray without changing the LED light color,the default current is

19mA,meantime,users can use the external REXT resistor to adjust the output current.It support the

output polarity reversal function.

WS2821 has the independent write code signal line,the address can be written in series at one time.