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Quick Answer
The UCS8904B is a 4-channel constant-current LED driver IC with 65536-level true grayscale, 4KHz port scanning frequency, and single-wire data transmission supporting unlimited cascading. It is designed for RGBW pixel lighting applications including LED point lights, flexible LED strips, and indoor/outdoor screens. With built-in 5V regulator, 28V output withstand voltage, and S-Al anti-interference technology, it delivers stable performance across 6–24V supply voltages.
What Is the UCS8904B?
The UCS8904B is a single-wire, 4-channel constant-current LED driver IC designed for addressable RGBW lighting systems. It converts serial data input into precise PWM output for red, green, blue, and white channels — enabling full-color pixel control with high grayscale resolution.
Unlike standard SPI chips, the UCS8904B features an integrated voltage regulator, robust anti-interference technology, and a wide operating voltage range. This makes it suitable for applications requiring reliable signal transmission and consistent color output.
Key Features
1. 65536-Level True Grayscale – Smooth, Professional Dimming
The UCS8904B supports 65536 levels of true grayscale (16-bit), delivering:
Ultra-smooth color transitions
No visible stepping or banding
Professional-grade visual performance for camera-facing applications
2. 4KHz Port Scanning Frequency – Flicker-Free Performance
With a 4KHz port scanning frequency, the UCS8904B reduces visible flicker in video recording — an important consideration for stage, broadcast, and film applications.
3. Single-Wire Data Transmission – Unlimited Cascading
The IC uses single-wire data transmission, allowing:
Simple wiring and daisy-chaining
Unlimited cascading without complex addressing
Data transmission rate of 800Kbps
4. Strong Shaping and Forwarding Technology – 10m+ Transmission
The built-in signal shaping and forwarding technology enables:
Transmission distance between two points exceeding 10 meters
Reliable signal integrity over long runs
Reduced need for signal amplifiers
5. Built-In 5V Regulator – Wide Voltage Operation
The UCS8904B includes a built-in 5V regulator tube, allowing direct operation from 6V to 24V supply voltages with an external resistor. The output port withstand voltage is 28V.
6. Preset 18mA/Channel Constant Current – High Accuracy
The IC operates in preset 18mA/channel constant current mode, with:
Inter-chip error < ±3% – consistent brightness across ICs
Current offset between channels < ±3% – accurate color mixing
Stable output across temperature variations
7. S-Al Anti-Interference Technology – Reliable Signal
The patented S-Al single-wire transmission anti-interference technology:
Reduces and filters radiation interference
Reduces conduction interference
Ensures stable data transmission in demanding environments
8. ESD and Surge Protection – Enhanced Durability
The UCS8904B features enhanced electrostatic and surge protection (ESD 8000V), making it suitable for outdoor and industrial applications.
9. Power-On Self-Test Blue Light Function
The IC includes a power-on self-test blue light function, providing a visual indication that the chip is receiving power and initializing correctly.
Technical Specifications
Parameter | Value |
|---|---|
Logic Supply Voltage (Vdd) | 6.5V max |
Output Port Max Voltage | 30V |
Logic Input Voltage | -0.5V to Vdd+0.5V |
Operating Temperature | -40°C to +85°C |
Storage Temperature | -55°C to +150°C |
ESD Rating | 8000V |
Rated Output Power | 400mW |
Output Current per Channel | 18mA (constant current) |
Grayscale | 65536 levels (16-bit) |
Port Scanning Frequency | 4KHz |
Data Transmission Rate | 800Kbps |
Package | SOP8 |
Thermal Resistance | 80–190°C/W |
Voltage Regulation Configuration
Supply Voltage | Recommended Resistor (VDD) |
|---|---|
5V | 100Ω |
12V | 750Ω – 1KΩ |
24V | 2.4KΩ – 3KΩ |
Note: A larger power supply resistance reduces power consumption but also reduces cable distance between ICs. A smaller resistance increases power consumption but extends the distance between ICs.
Signal Protection
Supply Voltage | Signal Protection Resistor |
|---|---|
12V | 68Ω (input and output) |
24V | 120Ω (input and output) |
Add a 104pF or higher high-frequency capacitor between power and ground to reduce switching interference.
Power Consumption Calculation
At a voltage drop (Vds) of 4V per output pin, the power consumption at maximum grayscale is:
P = PRGB + PVDD = 4 × 4V × 18mA + 5V × 10mA = 0.288W + 0.05W = 0.335W
The recommended maximum Vds for double-sided thin fiber boards at 25°C ambient is 4V (based on maximum power consumption of 350mW).
Channel Output | Current (mA) | Vds-max (V) |
|---|---|---|
4-channel | 18 | 4 |
Important: The maximum power consumption is not fixed — it is proportional to the heat dissipation capacity of the lamp, board size, layout, potting glue, and ambient temperature. For high-power applications, a high-temperature aging test is recommended.
Applications
Application | Why UCS8904B Fits |
|---|---|
LED point lights | 4-channel RGBW control, 65536 grayscale |
Flexible LED strips | Single-wire transmission, unlimited cascading |
Indoor/outdoor screens | 4KHz refresh, anti-interference technology |
Stage and broadcast | Flicker-free performance for camera |
Architectural lighting | Stable output across 6–24V supply |
Pixel-mapped installations | High grayscale, precise color mixing |
Comparison: UCS8904B vs Standard SPI Chips
Feature | Standard SPI (e.g., WS2812B) | UCS8904B |
|---|---|---|
Grayscale | 256 levels (8-bit) | 65536 levels (16-bit) |
Refresh Frequency | ~400Hz–2kHz | 4KHz |
Transmission Distance | Limited | >10 meters |
Built-in Regulator | No | Yes (5V) |
Anti-Interference | Standard | S-Al patented technology |
ESD Protection | 2kV typical | 8kV |
Cascading | Limited by signal degradation | Unlimited |
Summary
Advantage | Benefit |
|---|---|
65536-level grayscale | Ultra-smooth dimming and color transitions |
4KHz refresh frequency | Flicker-free performance for video |
Single-wire transmission | Simple wiring, unlimited cascading |
10m+ transmission distance | Reliable signal over long runs |
Built-in 5V regulator | Wide 6–24V operating voltage |
18mA constant current | Consistent brightness, ±3% accuracy |
S-Al anti-interference | Stable data in demanding environments |
8kV ESD protection | Enhanced durability |
Related Content
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