CXLE87208-12 is a dedicated driver IC that integrates MCU single wire digital interface, data latch, four constant current outputs, and PWM brightness control circuit. Its biggest feature is the optimization of the "wick sealing" process, which achieves multi chip control through a single wire cascade interface, greatly simplifying system wiring and peripheral device requirements. The chip has a built-in 5V voltage regulator circuit, which does not require external VDD-GND capacitors and has high reliability and stability, suitable for various integrated LED light source products.
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[ CXLE87208-12 ]"
CXLE87208-12: A single wire four channel LED constant current driver chip designed specifically for wick sealing
Today, as LED lighting and display technology continues to develop towards high integration, low cost, and easy packaging, CXLE87208-12 is designed specifically for; Core sealing” The single line four channel LED constant current driver chip designed for application is becoming an ideal driving solution for compact optoelectronic devices such as RGBW beads and intelligent lighting modules, thanks to its highly integrated design, dual W-port configurable output, and simple design that does not require external capacitors. This article will delve into the technical architecture, core functions, and typical applications of the chip, providing engineers with a complete design reference.
1、 Chip Overview
CXLE87208-12 is a dedicated driver IC that integrates MCU single wire digital interface, data latch, four constant current outputs, and PWM brightness control circuit. Its biggest feature is designed for“ Core sealing” Process optimization achieves multi chip control through a single wire cascade interface, greatly simplifying system wiring and peripheral device requirements. The chip has a built-in 5V voltage regulator circuit, which does not require external VDD-GND capacitors and has high reliability and stability, suitable for various integrated LED light source products.
2、 Core functional features
• Four channel constant current outputProvide five output ports: R, G, B, W1, and W2, with W1 and W2 outputting synchronously and supporting one or two times the current configuration.
• Fixed output currentEach channel has a constant current of 12mA, high consistency, and inter channel error; 3%.
• 256 level PWM dimmingEach channel supports 256 levels of brightness adjustment, achieving precise color and brightness control.
• Single line serial cascadeSupport automatic shaping and forwarding, stable signal transmission, and unlimited cascading number.
• Dual W-port current expansionFlexible expansion of W-channel current through wire configuration to meet different brightness requirements.
• No external capacitor designEliminating capacitors between VDD-GND simplifies PCB layout and BOM costs.
• High communication speedThe data transmission rate is 800Kbps, the refresh rate is 2kHz, and the response is fast.
3、 Electrical characteristics and packaging information
CXLE87208-12 performs excellently in terms of electrical performance:
• OUT port withstand voltage of 5V, suitable for low voltage LED modules.
• The working temperature range is -40 ℃ to+85 ℃, suitable for harsh environments.
• Typical static current of 0.75mA, low power consumption.
• Adopting a compact chip package (305μ m× 510μ m), suitable for COB or wick sealing processes.
4、 Communication Protocol and Data Format
The chip adopts a single line zeroing code communication protocol, and each chip receives 32-bit data. The structure is as follows:
• 32-bit data packetArrange in the order of R, G, B, and W, with 8 bits per channel, and control the PWM duty cycle.
• Reset signalLow level active, used to trigger data validation and system reset.
The chip automatically forwards subsequent data after receiving 32-bit data, achieving seamless cascading. The controller only needs to send data packets from each chip in sequence, and finally send a reset signal to complete the system refresh.
5、 Typical Application Design Guidelines
5.1. Cascade and refresh rate calculation
Taking 800Kbps communication rate as an example:
• Each RGBW pixel requires 32-bit data and a transmission time of 40 seconds.
• When the system contains 1000 pixels, the single refresh time is 40ms and the refresh rate is 25Hz, which is suitable for most decorative lighting and indication applications.
5.2. Peripheral Circuit Design
• Signal lines (DIN/DO) are recommended to be connected in series for 100– 200Ω Resistors prevent signal interference when cascading equipment is damaged.
• No need for external VDD-GND capacitors, the layout is simpler.
• Suitable for 5V system power supply, with simple power supply design.
5.3. W-port current configuration
By selecting to enable W1 or W1+W2 through the binding line, a white light output current of 12mA or 24mA can be achieved, meeting the requirements of different brightness scenarios and greatly enhancing the flexibility of the design.
6、 Constant current performance and system advantages
CXLE87208-12 shows stable performance in constant current output, and when the OUT port voltage is within the typical operating range, the output current does not fluctuate significantly with the voltage. Its excellent channel consistency and low-temperature drift characteristics enable it to provide reliable color consistency and brightness uniformity in both RGBW color mixing and white light illumination applications.
7、 Application scenarios
• Core sealed LED module
• RGBW smart light bulb
• LED decorative light strip
• Indoor and outdoor point light sources
• Compact display unit
8、 Conclusion
CXLE87208-12 provides a highly optimized driving solution for wick sealed LED products with its high integration, flexible W-port configuration, simple peripheral circuit, and stable single wire cascading capability. Whether it's colorful RGBW scenes or high brightness white lighting, this chip can significantly reduce system costs and design complexity while ensuring performance.
JTMIC（jtm-ic.com） As the official technical partner of this chip, we provide one-stop services from sample application, design support to bulk supply. If you need to obtain data manuals, design tools, or technical support, please visit our official website or contact our professional team.
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