WS2811 Datasheet by Adafruit Industries LLC

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WS2811
Signal line 256 Gray level 3 channal
Constant current LED drive IC
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Feature
l Output port compression 12V .
l Built in stabilivolt, Only add a resistance to IC
VDD feet when under 24V power supply.
l Gray level 256 can be adjusted and scan freque
ncy not less than 400Hz/s.
l Built in signal reshaping circuit,after wave resha-
ping to the next driver, ensure wave-form distor-
tion not accumulate.
l Built-in electric reset circuit and power lost reset
circuit.
l Cascading port transmission signal by single lin-
e.
l Any two point the distance more than 10m tran-
smission signal without any increasecircuit.
l When the refresh rate is 30fps, low speedmodelc
ascade number are not less than 512 points, hig-
h speed mode not less than1024 points.
l Send data at speeds of up to 400 Kbps and 800
Kbps two patterns.
Applications
l LED decorative lighting.
l Indoor/outdoor LED video or irregular screen.
General description
The WS2811 is 3 output channels special for LED driver circuit. It internal include intelligent digital port
data latch and signal reshaping amplification drive circuit.Also include a precision internal oscillator and a 12V
voltage programmable constant current output drive. In the purpose of reduce power supply ripple, the 3 outp-
ut channels designed to delay turn-on function.
IC use single NZR communication mode.After the chip power-on reset, the DIN port receivedata from con
troller, the first IC collect initial 24bit data then sent to the internal data latch, theother data which reshaping
by the internal signal reshaping amplification circuit sent to the next cascade IC through the DO port. After
transmission for each chip,the signal to reduce 24bit. IC adopt auto reshaping transmit technology, making the
chip cascade number is not limited the signal transmission, only depend on the speed of signal transmission.
The data latch of IC depend on the received 24bit data produce different duty ratio signal at OUTR,
OUTG, OUTB port. All chip synchronous send the received data to each segment when the DIN port input a
reset signal. It will receive new data again After the reset signal finished. Before a new reset signal received,
the control signal of OUTR ,OUTG , OUTB port unchanged. IC sent PWM data that received justly to OUTR,
OUTG , OUTB port, after receive a low voltage reset signal the time retain over 50us. We offer two package
SOP8 and DIP8.
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WS2811
Signal line 256 Gray level 3 channal
Constant current LED drive IC
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PIN configuration
PIN function
NO.
Symbol
Function description
1 OUTR Output of Red PWM control
2 OUTG Output of Green PWM control
3 OUTB Output of Blue PWM control
4 GND Ground
5 DOUT Data signal cascade output
6 DIN Data signal input
7 SET Set work mode of IC as low speed model(connect VDD)
or high speed model(vacant)
8 VDD Power supply voltage
Absolute Maximum Ratings
Prameter Symbol
Ratings Unit
Power supply voltage VDD +6.0~+7.0 V
Output voltage VOUT 12 V
Input voltage VI -0.5VDD+0.5 V
Operation junction
temperature Topt -25+85
Storage temperature range
Tstg -55~+150
Note: If the voltage on the pins exceeds the maximum ratings may cause permanent damage to the
device.
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WS2811
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Electrical CharacteristicsTA=-20+70VDD=4.55.5V ,VSS=0V ,unless otherwise specified
Prameter Smybol conditions Min Tpy Max Unit
IOL ROUT —— 18.5 —— mA
Low voltage
output current Idout V o=0.4VDOUT 10 —— —— mA
Input current II VI=VDD/VSS —— —— ±1 µA
VIH DINSET 0.7VDD
—— —— V
Input voltage level
VIL DINSET —— —— 0.3 VDD V
Hysteresis voltage
VH DINSET —— 0.35 —— V
Switching characteristicsTA=-20+70VDD=4.55.5V ,VSS=0V ,unless otherwise specified
Prameter Symbol Condition Min Tpy Max Unit
Fosc1 —— —— 400 —— KHz
Operation
frequency Fosc2 —— —— 800 —— KHz
Transmission
delay time tPLZ CL=15pF,DIN→
DOUT,RL=10KΩ —— —— 300 ns
Fall time tTHZ CL=300pF,OUTR/
OUTG/OUTB —— —— 120 µs
Data transmission
rate FMAX Duty ratio50% 400 —— —— Kbps
Input capcity CI —— —— —— 15 pF
Low Speed mode time
T0H 0 code,high voltage time 0.5 µs ±150ns
T1H 1 code,high voltage time 1.2 µs ±150ns
T0L 0 code,low voltage time 2.0 µs ±150ns
T1L 1 code,low voltage time 1.3 µs ±150ns
RES low voltage time Above 50µs
Note: It is one half of the time when high speed mode(reset time unchanged)
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WS2811
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Sequence chart:
0 c o d e
1 c o d e
R E T c o d e
T 0 H
T 0 L
T 1 H
T 1 L
T r e s e t
Cascade method:
D I N D I N D I ND O D O D O
I C 1 I C 2 I C 3
D 2
D 3
D 4
Data transmission method:
Note: The data of D1 is send by MCU,and D2, D3, D4 through IC internal reshaping amplification to
transmit.
Composition of 24bit data:
R7
R6
R5
R4
R3
R2
R1
R0
G7
G6
G5
G4
G3
G2
G1
G0
B7
B6
B5
B4
B3
B2
B1
B0
Note: Follow the order of RGB to sent data and the high bit sent at first.
D a t a r e f r e s h c y c l e 1
D a t a r e f r e s h c y c l e 2
f i r s t 2 4 b i t
s e c o n d
2 4 b i t
t h i r d 2 4 b i t
f i r s t 2 4 b i t
s e c o n d
2 4 b i t
t h i r d 2 4 b i t
s e c o n d
2 4 b i t
t h i r d 2 4 b i t
s e c o n d
2 4 b i t
t h i r d 2 4 b i t
t h i r d 2 4 b i t t h i r d 2 4 b i t
D 1
D 2
D 3
D 4
r e s e t c o d e
> = 5 0 u s
r e s e t
c o d e
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WS2811
Signal line 256 Gray level 3 channal
Constant current LED drive IC
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Typical application circuit:
1.power supply is 5V with 1 LED and constant current (18.5mA) driving
B
G
R
1 0 0 R
104
33R
5 V
33R
B
G
R
1 0 0 R
1 0 4
33R
5 V
V C C
L E D
c o n t r o l l e r
D A T
G N D
V D D O U T B O U T G O U T R
D I N
G N D
D O
G N DW S 2 8 1 1
V D D O U T B O U T G O U T R
D I N
GND
D O
G N DW S 2 8 1 1
d e p e n d o n c o n t r o l l e r
33R
Fig 1
This driving mode use constant current output, the advantage of is the LED can retain luminance and
colour temperature when the power supply lessen. We require, in order to prevent power spikes phenomenon
and power reverse polarity, series a not more than 100ohm resistor at the po-wer supply pin(VDD). The capac-
itance 104 as bypass capacitor. To prevent the reflection and hot-swap protection, we suggest to connect a 33
ohm resistor at the data input or output port for impedance.
2.power supply is 12V with 3 LED and constant current(18.5mA) driving
B
B
B G
G
G R
R
R
104
3 3 R 3 3 R
B
B
B G
G
G R
R
R
104
33R
12V 12V
VDD OUTB OUTG OUTR
D I N
GND
D O
GND
W S 2 8 1 1
V D D O U T B O U T G O U T R
D I N
GND
D O
GND
W S 2 8 1 1
V C C
LED
c o n t r o l l e r
D A T
G N D
R 1
R 1
R R R R
3 3 R
d e p e n d o n c o n t r o l l e r
Fig 2
The same as the front mode, it is also use constant current output. In this circuit, R1 is used as the IC
internal LDO divider resistance and the value is 2.7K. The capacitance 104 as bypass capacitor. To prevent the
reflection and hot-swap protection, we suggest to connect a 33ohm resistor at the data input or output port for
impedance. At the OUTR port we should add a divider resistance RR. The value of RR can be derived by
the following equation:
5
.
18
3 - 12LEDR V
RR=
VLEDR is the red LED forward conduction voltage drop.
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WS2811
Signal line 256 Gray level 3 channal
Constant current LED drive IC
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Package imformation:
DIP-8 Package:
Dimensions In Millmeters Dimensions In Inches Symbo
l Min Nom Max Min Nom Max
A 4.31 0.170
A1 0.38 0.015
A2 3.15 3.40 3.65 0.124 0.134 0.144
B 0.38 0.46 0.51 0.015 0.018 0.020
B1 1.27 1.52 1.77 0.050 0.060 0.070
C 0.20 0.25 0.30 0.008 0.010 0.012
D 8.95 9.20 9.45 0.352 0.362 0.372
E 6.15 6.45 6.65 0.242 0.252 0.262
E1 7.62 0.300
e 2.54 0.1
L 3.00 3.30 3.60 0.118 0.130 0.142
θ 0º 15º 0º 15º
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WS2811
Signal line 256 Gray level 3 channal
Constant current LED drive IC
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SOP-8 Package:
Dimensions In Millmeters Dimensions In Inches
Symbol
Min Max Min Max
A 1.350 1.750 0.053 0.069
A1 0.100 0.250 0.004 0.010
A2 1.350 1.550 0.053 0.061
b 0.330 0.510 0.013 0.020
c 0.170 0.250 0.006 0.010
D 4.700 5.100 0.185 0.200
E 3.800 4.000 0.150 0.157
E1 5.800 6.200 0.228 0.244
e 1.270 0.050
L 0.400 1.270 0.016 0.050
θ 0º 8º 0º 8º

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