CXLE88172 is an LED driver control dedicated circuit manufactured using power CMOS technology, which integrates MCI digital interface, data latch, and LED high-voltage driver module internally. This chip is mainly used to drive LED dot matrix displays, supporting 16 × 8 dot matrix displays, with practical functions such as brightness adjustment and open circuit detection. It adopts the SOP24 packaging form and is suitable for various portable devices, industrial display panels, and information publishing systems.
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[ CXLE88172 ]"
CXLE88172 LED Driver Chip Detailed Explanation: A Complete Guide from Features to Applications
Introduction
In today's electronic products, LED displays are widely used in various display devices due to their advantages of high brightness, low power consumption, and long lifespan. The core driving and control circuit of LED display directly determines the display effect and system stability. CXLE88172, as a high-performance driver control chip designed specifically for LED displays, integrates digital interfaces, data latches, and high-voltage drivers, making it suitable for various LED display application scenarios. This article will delve into the data manual of CXLE88172, covering its features, pin definitions, electrical parameters, instruction system, timing control, and practical application circuits, providing engineers and developers with a detailed technical reference.
1、 CXLE88172 Overview
CXLE88172 is an LED driver control dedicated circuit manufactured using power CMOS technology, which integrates MCI digital interface, data latch, and LED high-voltage driver module internally. This chip is mainly used to drive LED dot matrix displays and supports 16× 8-dot matrix display with practical functions such as brightness adjustment and open circuit detection, packaged in SOP24 form, suitable for various portable devices, industrial display panels, and information publishing systems.
2、 Main characteristics
• Advanced technologyUsing power CMOS technology, it has low power consumption and high integration.
• Strong driving ability: Supports 16× 8-point LED driver with high voltage output capability.
• Adjustable brightnessBuilt in 8-level adjustable duty cycle brightness adjustment circuit.
• Concise interfaceSupports two-wire serial interfaces (SCLK, DIN) for easy communication with microprocessors.
• Built in oscillatorBuilt in RC oscillator circuit, no need for external crystal oscillator.
• Power-on resetBuilt in power on reset circuit to improve system reliability.
• Open circuit detectionEquipped with LED open circuit detection function, ensuring that single point faults do not affect the overall display.
• Compact packagingAdopting SOP24 packaging, suitable for high-density PCB layout.
3、 Pin definition and functional description
Damaging the integrated circuit, it is recommended to take all appropriate preventive measures for the integrated circuit. Improper soldering operations may cause damage
It can cause ESD damage or performance degradation, and the chip cannot function properly.
The pin definitions of CXLE88172 are as follows:
• DIN (Pin 8)Serial data input, data changes at SCLK low level and latches at high level.
• SCLK (pin 9)Clock input, rising edge triggers data sampling.
• DAO~DAB (pins 1-6, 22-24)A group drives output, supporting P tube and N tube open drain output.
• DB0~DBB (pins 13-21)Group B drives the output, with the same structure as Group A.
• VDD (pins 7 and 12)Logic power supply positive pole.
• GND (pin 11)Logically speaking.
AttentionCXLE88172 is an electrostatic sensitive device, and anti-static measures should be taken during use to avoid device damage caused by ESD.
4、 Extreme parameters and electrical characteristics
4.1. Limit parameter (Ta=25 ℃)
• Logic power supply voltage VDD: 2.5V~4.5V
• Logic input voltage VI1: -0.5V~VDD+0.5V
• Port current IOP: -55mA (pull current), 200mA (sink current)
• Power loss PD: 400mW
• Working temperature: -40 ℃ to+85 ℃
• Storage temperature: -65 ℃~+150 ℃
4.2. Recommended working conditions
• VDD: 3.0V~3.6V (typical 3.3V)
• High level input voltage VIH:≥ 0.7VDD
• Low level input voltage VIL:≤ 0.3VDD
4.3. Electrical characteristics (VDD=3.3V)
• Pull current Ioh1: -5.2mA~-10.4mA
• Pull current Ioh2: -13mA~-33mA
• Injecting current IOL: 46mA~114mA
• Dynamic current IDDdyn:≤ 1mA (no load)
4.4. Switch characteristics
4.5. Temporal characteristics
4.6. Time series waveform diagram
5、 Switch characteristics and timing requirements
|
parameter |
symbol |
typical value |
unit |
|---|---|---|---|
|
oscillation frequency |
fosc |
three hundred |
kHz |
|
transmission delay |
tₙt |
≤300 |
ns |
|
Maximum clock frequency |
Fmax |
one |
MHz |
|
Clock pulse width |
PWCLK |
≥400 |
ns |
|
Data establishment time |
tSetup |
≥100 |
ns |
|
Data retention time |
tHOLD |
≥100 |
ns |
6、 Instruction system and data transmission
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:
CXLE88182 supports two data transfer modes:
1. Address auto increment modeSuitable for continuously writing multiple display data.
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
2. Fixed address modeSuitable for writing data to non contiguous or specified addresses.
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
6.1. Instruction Format
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.
Instructions consist of 8-bit data, with the top two bits (B7, B6) used to distinguish instruction types:
• B7=1, B6=0: Display control commands
• B7=1, B6=1: Data command
6.2. Data Command 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:
In the above, AX+AY represents the negative terminal of the diode connected to AX, and the positive terminal of the diode connected to AY; BX+BY represents the negative terminal of the diode connected to BX,
The positive terminal of the diode connected by BY;
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;
Used to set the write address and test mode. For example:
• 1100XXXXWrite display data in normal mode
• 1101XXXXEnter testing mode (for internal use)
6.3. Display control commands
▲ 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, if the customer directly sends the screen open command, there will be
Possible display of garbled characters. So our company suggests that the customer perform a power on reset operation on the display register, that is, to reset 16 video memory addresses after power on
Write all data 0x00 in (C0H-CFH).
▲ Attention: It is recommended that bit4=0. If bit4=1, the display data written to the SRAM address cannot be written to an address that automatically increments by 1;
Used to control display switches and brightness levels, supporting 8 levels of duty cycle adjustment from 1/16 to 14/16.
6.4. Open circuit detection function
The chip does not need to send additional commands to enter the open circuit detection function, and the open circuit detection function is enabled by default.
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.
Precautions：
• It is recommended to reset the video memory after power on to avoid garbled characters.
• When the screen is turned off, all ports except DA8/DB8 are in a high impedance state.
• If Bit4=1, automatic address increment mode cannot be used.
7、 Open circuit detection function
CXLE88172 has the open circuit detection function enabled by default. During the scanning process, the chip will detect the voltage of each port. If an open circuit is found in the LED, the corresponding driver output will be automatically turned off to avoid accidentally lighting up other LEDs and improve system reliability.
Programming flowchart
7.1. Flowchart of program design using address auto increment
7.2. Flowchart of Program Design Using Fixed Address
8、 Application Circuit and Program Design
8.1. Typical Application Circuits
The chip communicates with MCU through SCLK and DIN, and can work with a small amount of external resistors and capacitors. The driver port can be directly connected to the LED dot matrix and supports common cathode/common anode connection.
8.2. Programming Process
8.2.1) Automatic Address Mode:
1. Initialization
2. Send the starting address command
3. Continuously sending display data
4. Send display control commands
8.2.2) Fixed address mode:
1. Initialization
2. Set each video memory address in sequence and send the corresponding data
3. Send display control commands
9、 Package size
CXLE88172 offers two packaging options, SOP24 and SSOP24, with dimensions that comply with industry standards, making it easy to automate mounting and soldering.
10、 Conclusion
CXLE88172, as a fully functional and stable LED driver chip, has rich display control functions and good compatibility, suitable for various LED display applications. Through the detailed analysis in this article, we hope to provide strong support for your product design. If you need to further understand the detailed parameters or application cases of the chip, you can refer to the official data manual or contact technical support.
elevenTheSelection 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 |
