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CXLE88182 single-wire serial LED driver chip: highly integrated, high-efficiency display driver solution

In the modern LED display and digital tube drive system, the efficient driver chip not only determines the stability and consistency of the display, but also directly affects the complexity and cost of the system design. As a single-wire serial communication constant current driver chip designed for LED display and digital tube driver, CXLE88182 has become an ideal choice for many display applications with its high integration, simple control logic and reliable cascade performance. This article will comprehensively analyze the functional characteristics, electrical parameters, communication protocols and typical applications of the CXLE88182, provide a complete technical reference for engineers and procurement personnel, and help JTM-IC the official website (jtm-ic.com) Users make better decisions in project selection.NhO嘉泰姆

1. Product Overview

CXLE88182 is a single-wire communication LED constant current driver chip manufactured by high-voltage power CMOS process, which integrates MCU digital interface, data latch, scan output and constant current driver circuit. The chip adopts 8 × 4 display scanning mode, and only one signal line can complete the data reception, decoding and forwarding, which greatly saves the port resources of MCU and simplifies the system wiring and program design. Its excellent signal shaping ability and stable cascade performance make it perform well in various display screens and digital tube drive applications.NhO嘉泰姆

2. core features

1. Single-wire serial communication interface

The chip supports single-wire serial data input (DIN), with a maximum transmission rate of 800Kbps, built-in RC oscillator and clock synchronization with the data signal, effectively avoiding signal distortion or attenuation in the cascade process.NhO嘉泰姆

2. 8 x 4 scan output architecture

It has 8 channels of current constant current output (SG0 ~ SG7) and 4 channels of current scanning output (GR0 ~ GR3), supports multi-channel LED dynamic scanning display, and is suitable for various digital tubes and dot matrix display screens.NhO嘉泰姆

3. High precision constant current output

The typical value of the constant current output of the SG port is 24mA, the current consistency is high, and the deviation between channels is controlled within ± 5% to ensure uniform display brightness.NhO嘉泰姆

4. Built-in data shaping and forwarding mechanism

After receiving the data of this unit, the chip can automatically shape the subsequent data and forward it to the next level chip through the DO port, supporting multi-chip cascade expansion and suitable for large-size display screen design.NhO嘉泰姆

5. Wide voltage working range

VDD operating voltage range of 4.5V ~ 5.5V, compatible with common 5V system power supply design.NhO嘉泰姆

6. Built-in power-on reset circuit

The chip has a power-on reset function to ensure stable initialization when the system is started.NhO嘉泰姆

7. Wide range of fields of application

Including but not limited:NhO嘉泰姆

•   Digital tube display driverNhO嘉泰姆

•   LED dot matrix displayNhO嘉泰姆

•   Information sign and industrial control instrument displayNhO嘉泰姆

•   Various low-power display modulesNhO嘉泰姆

3. pin function and internal structure

The CXLE88182 uses SOP16 package, the pin function is clear and clear, easy to system integration:NhO嘉泰姆

•   VDD: Positive pole of power supplyNhO嘉泰姆

•   GND: Power supply groundNhO嘉泰姆

•   SG0~SG7: 8-way constant current irrigation current outputNhO嘉泰姆

•   GR0~GR34-way scanning pull current outputNhO嘉泰姆

•   DINSerial data inputNhO嘉泰姆

•   DOSerial data output for cascade expansionNhO嘉泰姆

Its internal structure includes a serial decoding module, a data shaping and forwarding unit, an RC oscillator, a scan output logic and a constant current drive circuit, forming a complete data receiving & rarr; decoding & rarr; display & rarr; forwarding link.NhO嘉泰姆

4. electrical characteristics and performance parameters

4.1. Input and output equivalent circuitNhO嘉泰姆
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4.2. Limit parametersNhO嘉泰姆
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(1) These levels in the above table, the chip may cause permanent damage to the device and reduce the reliability of the device under long-term use conditions.NhO嘉泰姆
We do not recommend that the chip work beyond these limit parameters under any other conditions;NhO嘉泰姆
(2) All voltage values are tested relative to the system ground.NhO嘉泰姆
4.3. Recommended working conditionsNhO嘉泰姆
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4.4. Electrical characteristicsNhO嘉泰姆
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4.5.Switching characteristicsNhO嘉泰姆
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4.6. Timing characteristicsNhO嘉泰姆
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Note:NhO嘉泰姆
(1) The cycle time for sending 0 code or 1 code is 1.25 μs (frequency 800KHz), and the low level time between bytes should not exceed 45 μs, noNhO嘉泰姆
The chip may be reset, reset and then re-receive data, can not achieve the correct data transmission;NhO嘉泰姆
(2) Code 0 controls the corresponding drive port to be turned off, and Code 1 controls the corresponding drive port to be turned on.NhO嘉泰姆
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Under the conditions of VDD = 4.5V ~ 5.5V and operating temperature -20 ℃ ~ 85 ℃, the CXLE88182 has stable electrical performance:NhO嘉泰姆

•   SG drive current: 23mA ~ 25mA (typical 24mA)NhO嘉泰姆

•   GR pull current capability: Typical 160mANhO嘉泰姆

•   Data Rate：800KbpsNhO嘉泰姆

•   GR scan cycle：500µsNhO嘉泰姆

•   Quiescent current loss:<5mA (no load)NhO嘉泰姆

•   ESD protection level：HBM 2000V，MM 200VNhO嘉泰姆

5. Communication Protocols and Data Formats

5.1.1) One frame complete data structureNhO嘉泰姆
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D1, D2, D3, D4,..., Dn have the same data format, D1 represents the data packet of the first chip in cascade, Dn represents the nth chip in cascadeNhO嘉泰姆
Each packet contains 32-bit data bits. Reset represents a reset signal, and the low level is active.NhO嘉泰姆
5.1.2）Data format of DnNhO嘉泰姆
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Each data packet contains a total of B0-B31 32-bit data bits, the low-order first, the corresponding relationship between the data bits and the drive channel controlled by it is as follows:NhO嘉泰姆
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5.1.3）data receiving and forwardingNhO嘉泰姆
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S1 is data sent by the controller, and S2, S3, and S4 are data forwarded by the cascade CXLE88182.NhO嘉泰姆
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The data receiving and forwarding process during chip cascade is as follows: the controller sends data packet D1, chip 1 receives the first set of 32bit, and chip 1NhO嘉泰姆
No forwarding; Then the controller sends the data packet D2, and chip 1 receives the second set of 32bits. Since chip 1 already has the first set of 32bits,NhO嘉泰姆
Chip 1 forwards the second set of 32bits to chip 2 through DO, and chip 2 receives data packet D2 forwarded by chip 1, at which time chip 2 does not forward;NhO嘉泰姆
The controller sends the data packet D3, and the chip 1 forwards the received third group of 32bits to the chip 2. Since the chip 2 already has the second group of 32bits,NhO嘉泰姆
Therefore, chip 2 forwards the third group of 32bits to chip 3, which receives the third group of 32bits;NhO嘉泰姆
to the respective display data. At this time, if the controller sends a Reset signal, all chips will reset and receive 32bitNhO嘉泰姆
After the data is decoded, the output of the drive port is controlled, and a data refresh cycle is completed, and the chip returns to the receiving preparation state.

The CXLE88182 uses a return-to-zero code communication method, each packet contains 32-bit data, and the low-order first. The correspondence between data bits and drive channels is as follows:NhO嘉泰姆

•   GR0 scan line: B0 ~ B7 control SG0 ~ SG7NhO嘉泰姆

•   GR1 scan line: B8 ~ B15 control SG0 ~ SG7NhO嘉泰姆

•   GR2 Scan Line: B16 ~ B23 control SG0 ~ SG7NhO嘉泰姆

•   GR3 Scan Line: B24 ~ B31 control SG0 ~ SG7NhO嘉泰姆

When the controller sends data, the following timing requirements shall be followed:NhO嘉泰姆

•   0 code high level time: 300ns ~ 500nsNhO嘉泰姆

•   1 code high level time: 600ns ~ 1000nsNhO嘉泰姆

•   Reset signal (Reset) low level time: ≥ 200 & micro;sNhO嘉泰姆

•   The low level time between bytes should not exceed 45 & micro; S, otherwise the chip may be resetNhO嘉泰姆

6. Cascade Application and System Design Suggestions

6.1. Cascade data processes.

The controller sequentially sends data packets of each chip, and after the first chip receives the first set of 32-bit data, subsequent data is automatically forwarded to the next chip. After the controller sends the Reset signal, all the chips synchronously update the display content to complete a refresh cycle.NhO嘉泰姆

6.2. System protection and decoupling design

•   The first chip DIN and the end chip DO ports are connected in series with 100Ω resistors to prevent instantaneous high-voltage impact caused by live plugging and unplugging.NhO嘉泰姆

•   104(0.1 & micro;F) decoupling capacitor should be arranged nearby between VDD and GND of each chip, and the trace should be as short as possible to improve system stability.NhO嘉泰姆

6.3. PCB Layout Recommendations

•   The power line and ground wire should be as wide as possible to reduce the voltage drop and noise.NhO嘉泰姆

•   Signal lines (DIN, DO) should avoid parallel routing with high-frequency or high-current lines to reduce interference.NhO嘉泰姆

6.4. Application InformationNhO嘉泰姆

CXLE88182 suitable for display driver or digital tube driver, the application circuit is as follows:NhO嘉泰姆
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In practical applications, the chips are generally cascaded as shown in Figure 7 to drive more LED lights, in order to prevent the product from being plugged and unplugged during testing.NhO嘉泰姆
The instantaneous high voltage generated causes damage to the signal input and output pins of the chip, which should be in the first chip of the signal input and the last chip of the output.NhO嘉泰姆
100 Ω protection resistors are connected in series, as shown by R1 and R2 in the figure.NhO嘉泰姆
In addition, the 104 decoupling capacitor of each chip in the figure is indispensable, and the VDD and GND pins from the trace to the chip should be as short as possible to achieve the bestNhO嘉泰姆
The decoupling effect stabilizes the chip work.NhO嘉泰姆

7. typical application scenarios

The CXLE88182 is suitable for the following typical application scenarios:NhO嘉泰姆

•   Multi-bit digital tube drive: Such as industrial meters, timers, meters, etc.NhO嘉泰姆

•   LED dot matrix displaySuch as indoor information screen, billboard, elevator status indicationNhO嘉泰姆

•   Energy-saving display moduleSuch as home appliance display panel, intelligent door lock status displayNhO嘉泰姆

•   Multi-stage cascade large screen system: such as station shift display, production board, etc.NhO嘉泰姆

8. epilogue

With its single-wire communication, high integration, stable cascade performance and excellent price competitiveness, CXLE88182 has become the preferred solution in the field of LED display driver. Whether it is a simple digital tube display or a complex multi-stage cascade screen system, CXLE88182 can provide reliable and efficient driver support. As a professional integrated circuit supplier, JTM-IC is committed to providing customers with high-quality product selection support and technical services.NhO嘉泰姆

For CXLE88182 samples, technical data or procurement information, welcome to visitJTM-IC official websiteOr contact our technical support team.NhO嘉泰姆

9.Related Chip Selection GuideMore similar products.....NhO嘉泰姆

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