CXLE87209 is a three channel LED constant current driver IC based on power CMOS technology, equipped with a complete single wire digital interface and control logic, suitable for various RGB LED enclosed lamps, decorative lighting, and intelligent light source scenes. Its biggest feature is that there is no need for external VDD-GND capacitors, the system structure is simpler, the cost is lower, and it is especially suitable for space limited wick sealing applications.
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[ CXLE87209 ]"
CXLE87209 single line three channel LEDconstant current driveIC: An efficient lighting solution designed specifically for wick sealing
In the field of LED lighting and control, driver chips with high integration, simple peripherals, and precise control have become the mainstream demand in the market.CXLE87209 is a single line three channel LED designed specifically for wick sealing applicationsconstant current driveThe control circuit integrates digital interfaces, data latchesPWM dimmingandconstant current driveIntegrated, multi chip cascade control can be achieved through only one signal line, greatly simplifying system design. This article will provide an in-depth introductionCXLE87209's functional features, communication protocolApplication CircuitProvide selection suggestions to assist engineers in creating efficientstableThe RGB lighting system.
1、 Product Overview
CXLE87209 is a three channel LED based on power CMOS technologyconstant current driveIC， Equipped with a complete single line digital interface and control logic, suitable for various RGB LED enclosed lamps, decorative lighting, and intelligent light source scenes. Its biggest feature is thatNo need for external VDD-GND capacitorsThe system structure is more concise and the cost is lower, especially suitable for space limited wick sealing applications.
2、 Core functional features
• Three channel constant current outputEach channel has a fixed output of 12mA, with high consistency.
• High voltage outputOUT port withstand voltage of 10V, suitable for various LED configurations.
• 256 levelsPWM dimming: Supports high precisionBrightness adjustmentSmooth without flickering.
• Single line serial cascadeSupports infinite cascading, automatic signal shaping, and no attenuation.
• High speed communicationThe data transmission rate reaches 800Kbps and the refresh rate is 3.6KHz.
• Built in power on resetDefault power on/off, reliable system startup.
• High refresh performanceAt 30 frames per second, the number of cascading points should not be less than 1024.
• No peripheral capacitorsEliminate VDD-GND capacitors and simplify PCB layout.
3、 Pin definition andElectrical parameters
CXLE87209 adopts a 7-pin package, with pin definitions as follows:
| Pin Name | serial number | direction | Instructions |
|---|---|---|---|
| GND | one | P | power ground |
| DO | two | O | Data cascading output |
| B | three | O | Blue channel output |
| G | four | O | Green channel output |
| VDD | five | P | positive power terminal |
| DIN | six | I | data input |
| R | seven | O | Red channel output |
• Working voltage: 3.3V~6V
• Static current: 0.37mA (typical)
• Output current: 12mA (fixed)
• Power consumption: as low as 0.53mA (typical)
4、 Communication Protocol and Data Format
CXLE87209 usesSingle line zeroing code communication protocolEach chip receives 24 bits of data (8 bits each for RGB), and the data format is as follows:
| channel | data bit | Dimming range | Instructions |
|---|---|---|---|
| R | BIT23– BIT16 | 0– two hundred and fifty-five | Red PWM duty cycle |
| G | BIT15– BIT8 | 0– two hundred and fifty-five | Green PWM duty cycle |
| B | BIT7– BIT0 | 0– two hundred and fifty-five | Blue PWM duty cycle |
The order of data transmission isHigh position first moverThey are R, G, and B in sequence. The reset signal should be valid at a low level for a duration of 200 minutes; s。
5、 TypicalApplication Circuitdesign
5.1. Basic wiring diagram
The following figure shows a typical application scheme under 5V power supply:
Controller→ DIN →CXLE87209 → DO → Next level…
Suggest connecting 100 pins in series between DIN and DO; 200Ω Resistors are used for signal isolation andESD protectionTo prevent single point failures from affecting the overall system.
5.2. Cascade Design Description
CXLE87209 supports infinite cascading, with each chip automatically forwarding subsequent data after receiving 24 bits of data. The system refresh rate is related to the number of pixels, and the specific calculation formula is as follows:
For example, a 1000 pixel system has a refresh time of 30ms and a refresh rate of approximately 33.3Hz.
5.3. Comparison Table of Cascade Points and Refresh Rate
| Pixel count | Refresh time (ms) | Refresh rate (Hz) |
|---|---|---|
| 1– five hundred | fifteen | sixty-six point seven |
| 1– one thousand | thirty | thirty-three point three |
| 1– two thousand | sixty | sixteen point seven |
6、 Constant current characteristics and output curve
CXLE87209 has excellent constant current performance, entering a constant current state when the OUT port voltage reaches 0.8V. As shown in the following figure, the output current remains high within the load voltage range of 1V~5VstableEnsure consistent LED brightness and system reliability.
! [Constant current curve graph]
7、 Packaging and chip layout
CXLE87209 adopts chip level packaging (Die) with a size of 300μ m× 300μ m, PAD size 75μ m× 75μm， The thickness of the top aluminum layer is 3.6 μ m. Suitable for COB (Chip on Board) or encapsulation processes, the substrate needs to be suspended or connected to GND.
8、 Selection comparison:CXLE87209 vsCXLE87210 vsCXLE87211B
| feature | CXLE8720nine | CXLE87210 | CXLE87211B |
|---|---|---|---|
| number of channels | 3 (RGB) | 4 (RGBW) | 4 (RGBW) |
| output current | 12mA (fixed) | 18mA (fixed) | 6.5– 38mA adjustable |
| dimming method | 256 level PWM | 256 level PWM | 256 level PWM+64 level constant current |
| Communication speed | 800Kbps | 800Kbps | 400Kbps |
| Peripheral capacitor | no need | Requires 104 capacitors | Requires 104 capacitors |
| Applicable scenarios | Core sealing, RGB decoration | RGBW lighting fixtures, guardrail tubes | High precision dimming, point light source |
9、 Recommended application scenarios
• RGB wick sealed lamp
• LED decorative light strip, pixel screen
• Smart home color lighting
• Advertising signage and landscape lighting
10、 Conclusion
CXLE87209, with its high integration, single line control, and no need for external capacitors, has become an ideal driving solution in the fields of wick sealing and RGB lighting. Whether pursuing ultimate simplicity in embedded design or large-scale cascading intelligent lighting systems, this chip can providestableEfficient performance support.
To obtainCXLE87209 samples, technical information or procurement support, welcome to visitJTM-IC official websiteWe provide original chips and professional servicesTechnical SupportProvide one-stop solutions to safeguard your lighting projects.
This article is compiled and published by the JTM-IC technical team. Please indicate the source when reprintingjtm-ic.com.
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