WS2812C

WS2812C Intelligent control LED integrated light source Features and Benefits           The control circuit and the LED share the only power source. Control circuit and RGB chip are integrated in a package of 5050 components, to form a complete addressable pixel. 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 is of 2KHz. Cascading port transmission signal by single line. Any two point the distance not more than 3m transmission signal without any increase circuit. When the refresh rate is 30fps, cascade number are not less than 1024 pixels. Send data at speeds of 800Kbps. The color of the light is 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 amplification drive circuit. Also include a precision internal oscillator and a 12V voltage programmable constant current 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 pixel, the signal to reduce 24bit. pixel adopt auto reshaping transmit technology, making the pixel cascade number is not limited the signal transmission, only depend on the speed of signal transmission. RESET time>280μs , it won't cause wrong reset while interruption, it supports the lower frequency and inexpensive MCU. Refresh Frequency updates to 2KHz, Low Frame Frequency and No Flicker appear in HD Video Camera, it improve excellent display effect. LED with low driving voltage, environmental protection and energy saving, high brightness, scattering angle 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. 1/8 http://www.world-semi.com WS2812C Intelligent control LED integrated light source Mechanical Dimensions Remarks: Dimension of 5.0*5.4*1.57mm, default Tolerance of 0.05mm. 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 Parameter Symbol Ratings Unit Power supply voltage VDD +3.7~+5.3 V Logical Input Voltage VI VDD-0.7～VDD+0.7 V Operation junction temperature Topt -25～+85 ℃ Storage temperature range Tstg -40~+105 ℃ 2/8 http://www.world-semi.com WS2812C Intelligent control LED integrated light source Electrical Characteristics（TA=-20～+70℃, VDD=4.5～5.5V, VSS=0V, unless otherwise specified） Parameter Symbol Min Tpy Max Unit Conditions Input current II —— —— ±1 µA VI=VDD/VSS VIH 0.7VDD —— —— V DIN, SET VIL —— —— 0.3 VDD V DIN, SET VH —— 0.35 —— V DIN, SET Input voltage level Hysteresis voltage Switching Characteristics（TA=-20～+70℃, VDD=4.5～5.5V, VSS=0V, unless otherwise specified） Parameter Symbol Min Tpy Max Unit Condition Transmission delay time TPLZ —— —— 300 ns CL=15pF, DIN→DOUT, RL=10KΩ Fall time TTHZ —— —— 120 µs CL=300pF, OUTR/OUTG/OUTB Input capacity CI —— —— 15 pF —— LED Characteristics Quiescent Current: 0.5mA Parameter Brightness Wavelength Symbol IV λd Color Mini Typ Max Red 150 -- 200 Green 400 -- 600 Blue 100 -- 150 Red 620 -- 630 Green 515 -- 525 Blue 465 -- 475 Unit Condition (Working current) mcd 5mA nm 5mA Data Transfer Time T0H 0 code, high voltage time 220ns~380ns T1H 1 code, high voltage time 580ns~1µs T0L 0 code, low voltage time 580ns~1µs T1L 1 code, low voltage time 220ns~420ns RES Frame unit, low voltage time >280µs 3/8 http://www.world-semi.com WS2812C Intelligent control LED integrated light source Sequence Chart 0 code Cascade Method T0L D1 T0H DIN DO T1L 1 code D2 PIX1 T1H DIN DO D3 PIX2 DIN DO D4 PIX3 Treset RET code Data Transmission Method 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: Data transmit in order of GRB, high bit data at first. Typical Application Circuit Remarks: C1 is the filter capacitor for VDD, its value of 100NF. 4/8 http://www.world-semi.com WS2812C Intelligent control LED integrated light source Packing Standard Carrier tape Packing: 1K/Reel: 167*12mm 4.5K/Reel: 327*12mm Anti-static bag Product Label The foam protective layer Guard against damp/ Keep dry Top SMD LED Using Instructions 1. Summary To make the best use of WORLDSEMI’s LED, please refer to the below precautions, they are of same usage method as other electronic components. 5/8 http://www.world-semi.com WS2812C Intelligent control LED integrated light source 2. Cautions 2.1. Dust & Cleaning The surface of the LED is encapsulated with modified epoxy resin because it plays a very good role in protecting the optical performance and aging resistance. The modified epoxy resin is easy to stick with dust and must be kept clean. When there’s a certain amount of dust on the surface of the LED, it won’t affect brightness, but dust proof should be taken care of. Promoting the use of unsealed package in preference to others and the assembled LEDs should be placed in a clean container. Avoid using the organic solvents to clean the dust on the LED surface and it’s necessary to confirm whether the cleaning fluid will dissolve the LED. Do not clean the LEDs by the ultrasonic. Some parameters affecting the LED performance must be evaluated if have no alternative but to the ultrasonic cleaning method, such as ultrasonic power, baking time and assembly conditions, etc. 2.2. Moisture-proof packaging TOP SMD LEDs are moisture sensitive components. LEDs are packaged in aluminum foil bag to prevent the from absorbing moisture during transport and storage. A desiccant is placed in the bags to absorb moisture. If the LED absorbs moisture, then it evaporates and expands when in reflow process, which may break the colloid from the bracket and damage the optical performance of LED. For this reason, moisture-proof packaging is to prevent the from absorbing moisture during transport and storage. The moisture resistance rating of WORLDSEMI’s LED is: LEVEL 6. Tabel I - IPC/JEDEC J-STD-020 Moisture/Reflow Sensitivity Classification MSL Level LEVEL1 LEVEL2 LEVEL2a LEVEL3 LEVEL4 LEVEL5 LEVEL5a LEVEL6 Workshop Life Conditions ≤30℃/85%RH ≤30℃/60%RH ≤30℃/60%RH ≤30℃/60%RH ≤30℃160%RH ≤30℃/60%RH ≤30℃/60%RH Take-out and Use immediately ≤30℃/60%RH Time Unlimited 1 Year 4 Weeks 168 Hours 72 Hours 48 Hours 24 Hours 2.3. Management after unpacking It’s recommend to perform SMT assembly as soon as possible after opening the moisture-proof bag, and reflow soldering should be completed within 4 hours after SMT assembly; for the remaining LEDs, they should be re-packed in seal package and placed in moisture-proof cabinet (Please note that it’s necessary to rebake at “70℃-75℃/48 hours” before next SMT process). 6/8 http://www.world-semi.com WS2812C Intelligent control LED integrated light source 3. Dehumidification Operation (Non-leakage of air, baking temperature:70℃-75℃) a. MD within 2 weeks, baking time: 24 hours. b. MD exceeds 2 weeks, baking time: 48 hours. 4. Management of secondary SMT process It’s necessary to do moisture-proof treatment when the secondary reflow carried out that followed the first reflow. It can’t be more than 2 hours to be exposed at condition of “