CXLE87133AB3 is a three-channel LED driver chip based on DMX512 single-line parallel protocol, which supports adaptive signal decoding from 200Kbps to 1000Kbps, and can automatically identify the transmission rate without external settings. The chip has built-in E2PROM, supports online cascade writing codes, and has a maximum addressing capacity of 4096 channels. It is suitable for high-density and large-scale LED lighting systems. Its three-channel stable output current structure is especially suitable for RGB full-color lighting systems, with high integration, high reliability and excellent anti-interference performance.
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[ CXLE87133AB3 ]"
CXLE87133AB3: professional three-channel DMX512 LED driver chip comprehensive analysis
In today's increasingly mature LED intelligent lighting control system, DMX512 protocol has become the preferred communication standard in the fields of stage lighting, building lighting, landscape decoration and so on by virtue of its efficient and flexible control mode.CXLE87133AB3As a three-channel high-precision constant current driver chip specially designed for parallel LED lighting system, it is not only perfectly compatible with DMX512 standard protocol, but also achieves a comprehensive breakthrough in decoding accuracy, system stability and engineering convenience. This article will introduce the performance advantages of the chip from technical characteristics, application design to system integration, providing reliable hardware support for lighting designers and engineers.
I. Product positioning and technical advantages
CXLE87133AB3 is based onDMX512 single-wire parallel protocolThree-channel LED driver chip, support200Kbps to 1000KbpsSelf-adaptive signal decoding can automatically identify the transmission rate without external settings. The built-in E2PROM chip supportsOnline cascade code writing, maximum addressing ability4096 Channel, suitable for high-density and large-scale LED lighting systems. ItsThree-channel stable output currentStructure, especially suitable for RGB full color lighting system, with high integration, high reliability and excellent anti-interference performance.
II. Features of core functions
2.1. Fully compatible with DMX512 and supports protocol extension
CXLE87133AB3 is not only compatible with the DMX512(1990) standard protocol, but also extends its functions. It supports high-speed data transmission and long-distance cascade, and is suitable for a variety of complex application scenarios.
2.2. Three-channel high-precision stable output current
The chip provides stable output current channels of R, G, and B. The default output current of each channel is18mA, the current deviation between channels is less± 3%, the deviation between chips is less± 5%, output port withstand voltage26VTo ensure the stable operation of the system for a long time.
2.3. Built-in E2PROM and Cascade code writing technology
The chip has built-in E2PROM memory without external storage components. Through the dedicated PI/PO write code line, users can write up to 1024 chips at a time in a system with a dot spacing of no more than 100 meters, support "install first and write code later", greatly improving the construction efficiency.
2.4. Strong anti-interference and high reliability
• Built-in S-AI anti-interference module with 8 anti-interference and verification mechanisms
• AdoptionXE2 address code backup mode, a single storage unit is damaged without affecting address reading
• Industrial operating temperature range:-40 ℃ to 85 ℃
2.5. Energy saving, low consumption and high refresh rate
The chip static current is only 3mA, the package power consumption is not more than 400MW, and the picture refresh rate is reached.3.6kHzTo ensure that the dynamic lighting effect is smooth and flicker-free.
3. Typical application scenarios
CXLE87133AB3 is widely applicable to the following lighting systems:
•RGB point light source and pixel screen
•Line light, wall washer and building facade lighting
•Stage lighting and Performance Control system
•Indoor and outdoor decorative lighting and video wall
•Landscape lighting and urban light and shadow engineering
Its parallel architecture design ensures that any chip fault in the system does not affect the operation of other nodes, and the system has strong fault tolerance and easy maintenance.
IV. Electrical parameters and Design Guidelines
4.1. Working conditions
•Logic power supply voltage: 3.8V to 6v (5V recommended)
•Output port withstand voltage: up to 26V
•Maximum power consumption: 400MW (SOP8 package)
4.2. Calculation of divider resistance
Take 24V power supply and 6 LEDs in series as an example:
•Red Light (VF = 2V):R = (24V-6 × 2V-3V)/18mA & asymp; 500Ω
•Green/blue light (VF = 3V):R = (24V-6 × 3V-3V)/18mA & asymp; 150Ω
4.3. Suggestions on system grounding and anti-interference
In parallel systems, ground voltage difference is the key to affect communication stability. It is recommended to directly connect the "-" Poles of all lamps through the shortest path to avoid circuitous grounding. The influence of differential pressure can be further reduced by adopting double-headed power supply and Earth diameter.
V. Code writing and system debugging
5.1. Online code writing process
•Connect the DI line to the coder A/D Terminal and keep the PI level high.
•After the code is written, the chip is automatically verified and the blue light is on. The new address code takes effect immediately without needing to be powered on again.
5.2. Precautions for sending controller
•Ensure that the bit duration of all data fields is the same as that of the start Field
•Keep PI and DI high during code writing to avoid signal interference
VI. Application scheme selection
6.1. General application mode
It is suitable for scenarios with short point spacing and low frame rate requirements. At a standard rate of 250Kbps, a single port can support up to 220 points to ensure smooth images.
6.2. Amplifier enhancement mode
When the point spacing is large or the single port load is large, it can be used with route Amplifier. 485 differential transmission is adopted between the controller and the amplifier to improve the signal quality and transmission distance.
VII. Application Information
7.1. Application Figure 1: conventional applications
Note: 1. Output high precision constant current, default value 18mA.
2. When no route amplifier is added, the standard speed of 250k should be adopted. It is not recommended to expand to 500K. At the standard speed of 250K,
To reach nearly 25 frames, the number of single-port connections of the controller cannot exceed 220 points. If less than 25 frames are allowed, more points can be connected under certain conditions.
Note: When there is a long connection between points, or when the number of single-port connection points of the controller is large, the frame rate also needs to be high, route amplifier can be used
The application mode. In route amplifier applications, 485 differential transmission is between the controller and the amplifier, and the amplifier converts the differential signal into a single line signal,
The distance between amplifier and lamp should be as short as possible.
Eight,Pins and functions
IX. Conclusion
CXLE87133AB3 as a highly integrated and reliable three-channel DMX512 driver chip, with its excellent constant current accuracy, flexible code writing method and strong anti-interference capability, it is an ideal choice for all kinds of LED lighting systems. Whether it is dynamic stage effect or static building lighting, CXLE87133AB3 can provide stable and efficient driving support.
For more information about CXLE87133AB3 and other DMX512 series products, please visit 【JTM-IC.com】 -- We are committed to providing high-quality integrated circuit solutions and technical support to customers around the world.
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