CXLE88173 is an LED driver control dedicated circuit manufactured using power CMOS technology, which integrates MCU digital interface, data latch, and LED high-voltage driver module internally. This chip supports 18 × 8 point LED driving and has functions such as brightness adjustment, open circuit detection, and two-wire serial communication, making it suitable for various LED display driving scenarios. Its packaging forms are mainly QSOP24-150 and QFN24, which have good heat dissipation performance and welding reliability.
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[ CXLE88173 ]"
Introduction: The Importance and Application Background of LED Driver Chips
With the rapid development of electronic display technology, LED displays are becoming increasingly widely used in fields such as advertising, traffic guidance, and industrial control. As the core component of LED display screens, the performance of LED driver control chips directly affects the display effect and system stability. CXLE88173 is a high-performance driver control chip designed specifically for LED display screens, integrating MCU digital interfaces, data latches, and high-voltage driver circuits, widely used in various electronic products. This article will provide an in-depth analysis of the characteristics, technical parameters, application circuits, and programming guidelines of CXLE88173, helping engineers and electronics enthusiasts to comprehensively master the usage of the chip.
1、 CXLE88173 chip overview
CXLE88173 is an LED driver control dedicated circuit manufactured using power CMOS technology, which integrates MCU digital interface, data latch, and LED high-voltage driver module internally. This chip supports 18× 8-point LED driver with functions such as brightness adjustment, open circuit detection, and two-wire serial communication, suitable for various LED display driving scenarios. Its packaging forms are mainly QSOP24-150 and QFN24, which have good heat dissipation performance and welding reliability.
2、 Detailed explanation of core features
1. High performance CMOS process
CXLE88173 adopts advanced power CMOS technology, which has the characteristics of low power consumption and high integration, and can operate stably in a wide temperature range of -40 ℃ to+85 ℃.
2.18× 8-dot matrix driving capability
The chip supports driving up to 144 LED dots, suitable for small and medium-sized LED display modules, and can achieve complex graphic and text display effects.
3.8 level brightness adjustment
By adjusting the duty cycle circuit, users can achieve 8-level brightness control and flexibly adapt to display requirements under different ambient light conditions.
4. Two wire serial interface (SCLK, DIN)
Adopting a simple two-wire communication protocol reduces the complexity of peripheral circuits and facilitates integration with various MCUs.
5. Built in RC oscillation and power on reset
The chip is equipped with an RC oscillation circuit and a power on reset function, eliminating the need for an external reset circuit and simplifying system design.
6. Open circuit detection function
When some LEDs open, the chip can automatically detect and isolate the fault point, ensuring that other LEDs display normally and improving system reliability.
3、 Pin definition and functional description
CXLE88173 has a total of 24 pins, mainly including data input (DIN), clock input (SCLK), two sets of driver outputs (DA0~DA8, DB0~DB8), power supply (VDD), and ground (GND). Here are some key pin descriptions:
• DIN (Pin 8)Serial data input, data is latched at the rising edge of SCLK.
• SCLK (pin 9)Clock signal input, controlling data synchronization.
• DA0~DA8、DB0~DB8A group and B group drive output, supporting P tube and N tube open drain output, can directly drive LED.
• VDD (pins 7 and 12)Logic power supply positive pole, recommended operating voltage is 3.0V~5.5V.
ESD protection tips：
CXLE88173 is an electrostatic sensitive device, and anti-static measures should be taken when used in a dry environment to avoid chip damage caused by improper operation.
4、 Electrical characteristics and working conditions
(1) Long term operation of chips under extreme parameter conditions may result in reduced reliability or permanent damage, and is not recommended for practical use
When used, any parameter reaches or exceeds these limit values.
(2) All voltage values are tested relative to the system ground.
4.2. Recommended working conditions
4.3. Electrical characteristics
4.4. Switch characteristics
Within the recommended operating voltage range (VDD=3.0V~5.5V), CXLE88173 exhibits excellent electrical performance:
• Pull current and fill current capability：
When VDD=5V, the typical value of port current is -27.5mA, and the current can reach 140mA, indicating strong driving capability.
• Dynamic current loss：
When there is no load, the maximum dynamic current is only 1mA, and the energy-saving effect is significant.
• Switch characteristics：
The typical value of the built-in oscillation frequency is 300kHz, with a maximum clock frequency of 1MHz. It has a fast response speed and is suitable for dynamic display scenarios.
5、 Timing and Communication Protocol
CXLE88173 adopts a two-wire serial communication protocol, with a data format of low bits before and high bits after. The starting condition for communication is that DIN changes from high to low when SCLK is high, and the ending condition is that DIN changes from low to high when SCLK is high. The timing parameters are as follows:
• Clock pulse width (PWCLK): Minimum 400ns
• Data setup time (tSetup): Minimum 100ns
• Data retention time (tHOLD): Minimum 100ns
These parameters ensure the stability and reliability of data transmission.
6、 Instruction set and display control
The data of the microprocessor communicates with CXLE88173 through a two-wire bus interface. When SCLK is at high level during data input, the signal on DIN
Must remain unchanged; The signal on DIN can only change when the clock signal on SCLK is at a low level. The input of data always comes in the lower order,
High bits are transmitted later The starting condition for data input is that when SCLK is at a high level, DIN changes from high to low; The end condition is that SCLK is high and DIN is
Low level changes to high level.
The process of instruction data transmission is shown in the following figure:
6.1.1) Write SRAM data address auto increment mode:
Command1: Set Data Command (Set Where to Write Address)
Data1~N: Transmission of display data (up to 16 bytes, no more writing allowed)
Command2: Control Display Command
6.1.2) Write SRAM data in fixed address mode:
Command1: Data Command (Set Address 1)
Data1: Transfer display data
CommandN: Data Command Settings (Set Address N)
DataN: Transmission of display data (up to 16 bytes, no more writing allowed)
Command2: Control Display Command
The first byte input by DIN after the command START is valid is considered as an instruction. After decoding, take the highest B7 and B6 bits
To distinguish different instructions.
If END is valid during instruction or data transmission, serial communication is initialized and the instruction or data being transmitted is invalid
The instructions or data transmitted in advance remain valid.
6.2.1） Data command (11XXXXXX)Used to set the video memory address and write display data.
This instruction is used to set the write address data and enter the testing mode settings.
The correspondence between data command settings and video memory (in normal mode)
The correspondence between display data, chip pins, and display addresses is shown in the following table:
Scanning Method Explanation (Taking Group A as an Example):
The first row scanning stage: A0 pin is row scanning, A0's NMOS transistor is turned on, and the other A1~A8 are column scanning. For example, A1 and A0 need to be illuminated
If the LED light on the foot is not needed, turn on the PMOS of A1 (A1 is connected to the P pole of the LED, A0 is connected to the N pole of the LED light). only
A1 foot needs to have high resistance.
The second row scanning stage: A1 foot is row scanning, and the rest is column scanning. The principle of lighting up the LED light is the same as above, up to the ninth scanning level
After the completion of the ninth scanning stage, the display will show that one scanning cycle has been completed, and repeating this scanning cycle will complete the display drive;
The chip supports multiple instruction settings, including data commands, display control commands, and open circuit detection commands. The instruction format is in bytes, with the top two digits used to distinguish instruction types:
6.2.2) Display control command (10XXXXXX)Used for switch display and setting brightness levels.
▲ Note: When the chip is in the off screen state, the driver pins DA8/DB8 are in the N-pin open drain output, and other driver ports are in the off state;
▲ Attention: The value stored inside the chip display register at the moment of power on may be random and uncertain. At this time, the customer directly sends a screen open command to
There is a possibility of displaying garbled characters. So our company suggests that the customer perform a power on reset operation on the display register, that is, to reset 18 video memory addresses after power on
All data 0x00 is written in (C0H-D1H).
6.2.3) Open circuit detection command (00XXXXXX)Enable or disable the open circuit detection function.
Due to the special scanning method of the driver ports in this chip, multiple paths will exist simultaneously between two driver ports during the display process.
Under normal display (LED not open circuit), only the path where a single LED is located will conduct, while other paths composed of two LEDs connected in series will not
Connect. However, when an open circuit occurs in the LED, there will be a situation where the path connecting the two LEDs in series is conductive. So, open circuit detection was designed in the chip
The function of testing. The function is to perform voltage detection on the corresponding ports before driving each LED. When an open circuit is detected in the LED, turn on
By controlling the logic and preventing the corresponding port from outputting drivers, it is possible to effectively prevent LED lights that were originally not lit from being mistakenly illuminated.
6.3. Memory Mapping Relationship：
The internal memory addresses of the chip range from C0H to DIH, corresponding to the scan data of group A and group B LEDs, respectively. By using automatic address addition or fixed address mode, the display content can be flexibly updated.
7、 Example of Application Circuit Design
The typical application circuit of CXLE88173 is shown in the following figure (omitted, refer to Figure 12 in the original text). The MCU communicates with the chip through SCLK and DIN, and the peripheral circuit is simple, requiring only a small amount of resistance and capacitance to work. Suggest adding 100μ F electrolytic capacitors and 104 ceramic capacitors between VDD and GND to stabilize the power supply.
Design considerations：
• It is recommended to reset the video memory after power on to avoid garbled characters.
• If using a long wire connection, 10k&Omega should be connected in series on the SCLK and DIN wires; Resist to prevent signal reflection.
8、 Programming flowchart
8.1.1) Program design flowchart using address auto increment
8.1.2) Flowchart of program design using fixed addresses
8.2. CXLE88173 supports two data writing modes: address auto increment and fixed address mode. The following is the basic programming process:
1. InitializationConfigure GPIO and clock of MCU.
2. Send the start commandSet the starting address of the video memory.
3. Transmission of dataSend display data in bytes.
4. Send display commandTurn on the display and set the brightness.
5. Loop refreshUpdate display content as needed.
The flowchart can refer to pages 10-11 of the original text, clearly showing the data flow and control logic.
9、 Packaging and Dimensional Information
CXLE88173 offers two packaging forms, QSOP24-150 and QFN24, with compact size suitable for high-density PCB layout. The specific size parameters can be found on page 13 of the original text. It is recommended to strictly follow the dimensions provided in the specification sheet when designing the PCB.
10、 Summary and Market Prospects
CXLE88173, as a comprehensive and stable LED driver chip, has broad application prospects in the field of display drivers. Its characteristics such as open circuit detection, brightness adjustment, and low power consumption make it particularly suitable for scenarios that require high reliability and flexible control. With the increasing demand for intelligent displays, the market potential of such high-performance driver chips will be further unleashed.
11、 Selection Guide for Related Chips; More similar products ....
| model | Number of interfaces | Drive dot matrix number | Segment/Position | common cathode drive | Gongyang Drive | button | package form | remark |
| CXLE88134N | three | twenty-eight | 7*4 | 7-segment 4-digit | - | - | SOP16/DIP16 | LED panel display driver chip |
| CXLE88135N | three | twenty-one | 8*2/7*3 | 8 segments 2 digits/7 segments 3 digits | - | 6*1 | SOP16 | LED panel display driver chip |
| CXLE88136N | three | thirty-five | 5*7/8*4 | 7-segment 5-digit/8-segment 4-digit | 7-segment 5-digit | 5*1 | SOP18/DIP18 | LED panel display driver chip |
| CXLE88137BN | three | forty-eight | 6*7/9*4 | 7-segment 6-digit/9-segment 4-digit | 7-segment 6-digit | 6*1 | SOP20 | LED panel display driver chip |
| CXLE88137N | three | forty-eight | 8*6/10*4 | 8 segments with 6 digits/10 segments with 4 digits | - | - | SOP20 | LED panel display driver chip |
| CXLE88138C | four | seventy-seven | 11*7/14*4 | 11 segments with 7 digits/14 segments with 4 digits | 7 sections with 11 digits | 10*3 | SOP32 | LED panel display driver chip |
| CXLE88138N | four | seventy-seven | 11*7/14*4 | 11 segments with 7 digits/14 segments with 4 digits | 7 sections with 11 digits | 10*3 | SOP32 | LED panel display driver chip |
| CXLE88139N | three | seventy-seven | 11*7/14*4 | 11 segments with 7 digits/14 segments with 4 digits | 7 sections with 11 digits | - | SOP24/QSOP24 | LED panel display driver chip |
| CXLE88141N | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88142A | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88142E | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88143AN | three | one hundred and twenty-eight | 16*8 | 16 segments with 8 digits | 8 segments with 16 digits | - | SOP32 | LED panel display driver chip |
| CXLE88143BN | three | one hundred and twelve | 14*8 | 14 segments with 8 digits | 8 sections with 14 digits | 8*2 | SOP32 | LED panel display driver chip |
| CXLE88143CN | three | one hundred and twenty | 15*8 | 15 segments with 8 digits | 8 segments with 15 digits | 8*1 | SOP32 | LED panel display driver chip |
| CXLE88143DN | three | ninety-six | 12*8 | 12 segments with 8 digits | 8 segments with 12 digits | 8*4 | SOP32 | LED panel display driver chip |
| CXLE88143N | four | one hundred and twenty-eight | 16*8 | 16 segments with 8 digits | 8 segments with 16 digits | 8*4 | QFP44 | LED panel display driver chip |
| CXLE88147N | three | eighty | 10*8 | 10 segments with 8 digits | 8 sections with 10 digits | 8*3 | SOP28 | LED panel display driver chip |
| CXLE88148N | three | sixty-four | 8*8 | 8 segments and 8 digits | 8 sections with 6 digits | 4*2 | SOP24/QSOP24 | LED panel display driver chip |
| CXLE88149B | two | one hundred and twenty-eight | 8*16 | 8 segments with 16 digits | 16 segments with 8 digits | - | SOP28、SSOP28 | LED panel display driver chip |
| CXLE88155N | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*2 | SOP24/SSOP24/SDIP24 | LED panel display driver chip |
| CXLE88171 | four | seventy-seven | 11*7/14*4 | 11 segments with 7 digits/14 segments with 4 digits | 7 sections with 11 digits | 10*3 | SOP32 | LED panel display driver chip |
| CXLE88172 | two | one hundred and twenty-eight | 8*16 | 8 segments with 16 digits | 16 segments with 8 digits | - | SOP24 | LED panel display driver chip |
| CXLE88173 | two | one hundred and forty-four | 8*9*2 | Forward and backward push digital tube | Forward and backward push digital tube | - | QSOP24 | LED panel display driver chip |
| CXLE88174 | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 8 touch buttons | SOP32 | LED panel display driver chip |
| CXLE88175 | five | one hundred and twenty | 15*8 | 15 segments with 8 digits | 8 segments with 15 digits | 8*1/8 | QFN48 | LED panel display driver chip |
| CXLE88176 | three | seventy-seven | 11*7/14*4 | 11 segments with 7 digits/14 segments with 4 digits | 7 sections with 11 digits | 10*1 | SOP24 | LED panel display driver chip |
| CXLE88156 | three | one hundred and twenty-eight | 8*16 | 8 segments with 16 digits | 16 segments with 8 digits | - | SOP32 | LED panel display driver chip |
| CXLE88134 | three | twenty-eight | 7*4 | 7-segment 4-digit | - | - | SOP16/DIP16 | LED panel display driver chip |
| CXLE88135 | three | twenty-one | 8*2/7*3 | 8 segments 2 digits/7 segments 3 digits | - | 6*1 | SOP16 | LED panel display driver chip |
| CXLE88136 | three | thirty-five | 5*7/8*4 | 7-segment 5-digit/8-segment 4-digit | 7-segment 5-digit | 5*1 | SOP18/DIP18 | LED panel display driver chip |
| CXLE88137 | three | forty-eight | 8*6/10*4 | 8 segments with 6 digits/10 segments with 4 digits | - | - | SOP20 | LED panel display driver chip |
| CXLE88137A | three | forty-eight | 6*7/9*4 | 7-segment 6-digit/9-segment 4-digit | 7-segment 6-digit | 6*1 | SOP20 | LED panel display driver chip |
| CXLE88138 | four | seventy-seven | 11*7/14*4 | 11 segments with 7 digits/14 segments with 4 digits | 7 sections with 11 digits | 10*3 | SOP32 | LED panel display driver chip |
| CXLE88139 | three | seventy-seven | 11*7/14*4 | 11 segments with 7 digits/14 segments with 4 digits | 7 sections with 11 digits | - | SOP24/QSOP24 | LED panel display driver chip |
| CXLE88140A | four | seventy-seven | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*1 | SOP32 | LED panel display driver chip |
| CXLE88140B | three | seventy-seven | 11*7/14*4 | 11 segments with 7 digits/14 segments with 4 digits | 7 sections with 11 digits | 10*3 | QFP44 | LED panel display driver chip |
| CXLE88141 | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88142 | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88143 | four | one hundred and twenty-eight | 16*8 | 16 segments with 8 digits | 8 segments with 16 digits | 8*4 | QFP44 | LED panel display driver chip |
| CXLE88143A | three | one hundred and twenty-eight | 16*8 | 16 segments with 8 digits | 8 segments with 16 digits | - | SOP32 | LED panel display driver chip |
| CXLE88143B | three | one hundred and twelve | 14*8 | 14 segments with 8 digits | 8 sections with 14 digits | 8*2 | SOP32 | LED panel display driver chip |
| CXLE88143C | three | one hundred and twenty | 15*8 | 15 segments with 8 digits | 8 segments with 15 digits | 8*1 | SOP32 | LED panel display driver chip |
| CXLE88143D | three | ninety-six | 12*8 | 12 segments with 8 digits | 8 segments with 12 digits | 8*4 | SOP32 | LED panel display driver chip |
| CXLE88144 | three | thirty-five | 7*5/8*4 | 7-segment 5-digit/8-segment 4-digit | - | 7*1 | DIP18 | LED panel display driver chip |
| CXLE88145 | two | thirty-two | 8*4 | - | 8 sections with 4 digits | 8*2 | DIP18 | LED panel display driver chip |
| CXLE88146 | two | forty-eight | 8*6 | - | 8 sections with 6 digits | 8*2 | SOP20/DIP20 | LED panel display driver chip |
| CXLE88147 | three | eighty | 10*8 | 10 segments with 8 digits | 8 sections with 10 digits | 8*3 | SOP28 | LED panel display driver chip |
| CXLE88148 | three | sixty-four | 8*8 | 8 segments and 8 digits | 8 sections with 6 digits | 4*2 | SOP24/QSOP24 | LED panel display driver chip |
| CXLE88149 | two | one hundred and twenty-eight | 8*16 | 8 segments with 16 digits | 16 segments with 8 digits | - | SOP28/SSOP28 | LED panel display driver chip |
| CXLE88150 | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88151 | two | thirty-two | 8*4 | 8-segment 4-digit/7-segment 4-digit | - | 7*4 | SOP16/DIP16 | LED panel display driver chip |
| CXLE88152 | two | twenty-eight | 7*4 | - | 7-segment 4-digit | 7*1 | SOP16/DIP16 | LED panel display driver chip |
| CXLE88153 | one | forty | 7*6/8*5 | 7-segment 6-digit/8-segment 5-digit | 6 segments with 7 digits/5 segments with 8 digits | - | SOP16 | LED panel display driver chip |
| CXLE88154 | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88155 | three | seventy | 10*7/13*4 | 10 segments with 7 digits/13 segments with 4 digits | 7 sections with 10 digits | 10*2 | SOP24/SSOP24/SDIP24 | LED panel display driver chip |
| CXLE88133 | two | two hundred and fifty-six | 32*8/24*16 | 32 segment 8-bit/24 segment 16 bit | 8 segments 32-bit/16 segments 24 bit | - | LQFP48/LQFP52 | LED panel display driver chip |
| CXLE88132 | four | two hundred and fifty-six | 32*8/24*16 | 32 segment 8-bit/24 segment 16 bit | 8 segments 32-bit/16 segments 24 bit | - | LQFP48/LQFP52 | LED panel display driver chip |
