WS2821 datasheet(2/8 Pages) WORLDSEMI

2 / 8 page

WS2821

Parallel-Single wire-Three channels

256 Gray level Constant current LED driven IC

http://www.world-semi.com

PIN configuration

PIN Function

Pin NO.

Symbol

Pin Name

Pin description

GND

Chip Ground

Ground

Non connection

ADRO

Address output

Cascade address output port

ROUT

Driven output

R（Red LED）PWM control output,hight voltage PIN

GOUT

G（Green LED）PWM control output,hight voltage PIN

BOUT

B（Blue LED）PWM control output,hight voltage PIN

GND

Chip Ground

External adjustable resistor being connected to the

ground,control OUT（R/G/B）output current

DAI

Data input

Gray control data signal input port

REXT

Output current set port

External resistor,connect with the REXT and GND,used

to adjust the R/G/B OUT output current value

SPWM

PWM

output

polarity reversal

Default”1”:Three

channel

normal

output,(Non

connection or connect with VCC);

For”0”,(SPWM connect with the GND),three channels

output

polarity reversal

ADRI

Address input

Cascade address input port

VCC

Chip power supply

Power supply,typical application is 5V

Non connection

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