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WS2812B Datasheet

Parallax Inc.

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Datasheet

WS2812B
Intelligent control LED
integrated light source
Features and Benefits
Intelligent reverse connect protection, the power supply reverse connection does not damage the IC.
The control circuit and the LED share the only power source.
Control circuit and RGB chip are integrated in a package of 5050 components, form a complete control of pixel
point.
Built-in signal reshaping circuit, after wave reshaping to the next driver, ensure wave-form distortion not
accumulate.
Built-in electric reset circuit and power lost reset circuit.
Each pixel of the three primary color can achieve 256 brightness display, completed 16777216 color full color
display, and scan frequency not less than 400Hz/s.
Cascading port transmission signal by single line.
Any two point the distance more than 5m transmission signal without any increase circuit.
When the refresh rate is 30fps, cascade number are not less than1024 points.
Send data at speeds of 800Kbps.
The color of the light were highly consistent, cost-effective..
Applications
Full-color module, Full color soft lights a lamp strip.
LED decorative lighting, Indoor/outdoor LED video irregular screen.
General description
WS2812B is a intelligent control LED light source that the control circuit and RGB chip are integrated in
a package of 5050 components. It internal include intelligent digital port data latch and signal reshaping ampli
fication drive circuit. Also include a precision internal oscillator and a 12V voltage programmable constant curr
e-nt control part, effectively ensuring the pixel point light color height consistent.
The data transfer protocol use single NZR communication mode. After the pixel power-on reset, the DIN
port receive data from controller, the first pixel collect initial 24bit data then sent to the internal data latch,
the other data which reshaping by the internal signal reshaping amplification circuit sent to the next cascade
pixel through the DO port. After transmission for each pixelthe signal to reduce 24bit. pixel adopt auto resha
-ping transmit technology, making the pixel cascade number is not limited the signal transmission, only depend
on the speed of signal transmission.
LED with low driving voltage, environmental protection and energy saving, high brightness, scattering angl
e is large, good consistency, low power, long life and other advantages. The control chip integrated in LED
above becoming more simple circuit, small volume, convenient installation.
WS2812B
Intelligent control LED
integrated light source
Mechanical Dimensions
PIN configuration
PIN function
NO.
Symbol
Function description
1
VDD
Power supply LED
2
DOUT
Control data signal output
3
VSS
Ground
4
DIN
Control data signal input
Absolute Maximum Ratings
Prameter
Symbol
Ratings
Unit
Power supply voltage
VDD
+3.5~+5.3
V
Input voltage
VI
-0.5VDD+0.5
V
Operation junction
temperature
Topt
-25+80
Storage temperature range
Tstg
-40~+105
Electrical CharacteristicsTA=-20+70VDD=4.55.5V,VSS=0V,unless otherwise specified
WS2812B
Intelligent control LED
integrated light source
Prameter
conditions
Min
Tpy
Max
Unit
Input current
VI=VDD/VSS
——
——
±1
µA
Input voltage level
DINSET
0.7VDD
——
——
V
DINSET
——
——
0.3 VDD
V
Hysteresis voltage
DINSET
——
0.35
——
V
Switching characteristicsTA=-20+70VDD=4.55.5V,VSS=0V,unless otherwise specified
Prameter
Symbol
Condition
Min
Tpy
Max
Unit
Transmission delay
time
tPLZ
CL=15pF,DIN→
DOUT,RL=10KΩ
——
——
300
ns
Fall time
tTHZ
CL=300pF,OUTR/OU
TG/OUTB
——
——
120
µs
Input capcity
CI
——
——
——
15
pF
RGB IC characteristic parameter
Emitting color
Model
Wavelength(nm)
Luminous intensity(mcd)
Voltage(V)
Red
13CBAUP
620-625
390-420
2.0-2.2
Green
13CGAUP
522-525
660-720
3.0-3.4
Blue
10R1MUX
465-467
180-200
3.0-3.4
Data transfer time( TH+TL=1.25µs±600ns)
T0H
0 code ,high voltage time
0.4us
±150ns
T1H
1 code ,high voltage time
0.8us
±150ns
T0L
0 code , low voltage time
0.85us
±150ns
T1L
1 code ,low voltage time
0.45us
±150ns
RES
low voltage time
Above 50µs
Sequence chart:
WS2812B
Intelligent control LED
integrated light source
0 code
1 code
RET code
T0H
T0L
T1H
T1L
Treset
Cascade method:
DIN DIN DINDO DO DO
PIX1
D1 D2 D3 D4
PIX2 PIX3
Data transmission method
Data refresh cycle 1 Data refresh cycle 2
first 24bit second
24bit third 24bit first 24bit second
24bit third 24bit
second
24bit third 24bit second
24bit third 24bit
third 24bit third 24bit
D1
D2
D3
D4
reset code
>=50us reset
code
WS2812B
Intelligent control LED
integrated light source
Note: The data of D1 is send by MCU,and D2, D3, D4 through pixel internal reshaping amplification to
transmit.
Composition of 24bit data:
G7
G6
G5
G4
G3
G2
G1
G0
R7
R6
R5
R4
R3
R2
R1
R0
B7
B6
B5
B4
B3
B2
B1
B0
Note: Follow the order of GRB to sent data and the high bit sent at first.
Typical application circuit:
1 2 3 4 5 6
A
B
C
D
654321
D
C
B
A
Title
Number RevisionSize
B
Date: 9-Apr-2013 Sheet of
File: E:\芯片资料\WS2812\WS2812B\原理 .Ddb Drawn By:
VDD
1
DOUT
2VSS 3
DIN 4
U1
WS2812B
VDD
1
DOUT
2VSS 3
DIN 4
U2
WS2812B
C1
104
C2
104
DIN
5V
5V
VDD
1
DOUT
2VSS 3
DIN 4
U1
WS2812B
C1
104
5V
DOUT

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