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CXLE88139N LED driver control chip details: features, application and Design Guide

I. Product Overview

CXLE88139N is a high-performance driver control integrated circuit specially designed for LED display equipment. The chip integrates MCU digital interface, data latch, LED circuit and other functional modules, with excellent reliability, stability and anti-interference capability. It is widely used in household appliances such as intelligent water heaters, microwave ovens, washing machines, air conditioners, induction cookers, and digital tube or LED display devices such as set-top boxes, electronic scales, and smart meters.BfE嘉泰姆

II. Main features

2.1.CMOS process: low power consumption and high integration;BfE嘉泰姆

2.2. Multiple Display modes: supports flexible configuration of 11 segments × 7 bits to 14 segments × 4 bits;BfE嘉泰姆

2.3 brightness adjustment: 8-level duty cycle adjustable, supports smooth brightness adjustment;BfE嘉泰姆

2.4. Serial Interface: communicate through CLK, STB, and DIN three lines;BfE嘉泰姆

2.5. Built-in RC oscillator: simplified system design without external crystal oscillator;BfE嘉泰姆

2.6 power-on reset and data latching: ensure system startup stability and data integrity;BfE嘉泰姆

2.7. Anti-interference optimization: specifically optimize the dark light problem caused by LED reverse bias leakage;BfE嘉泰姆

2.8. Encapsulation form: provides 1200.00G encapsulation options for SOP24 and QSOP.BfE嘉泰姆

III. Pin connections and functions

CXLE88139N there are 24 pins in total, including:BfE嘉泰姆

3.1.DIN(Pin 1): serial data input, rising edge sampling;BfE嘉泰姆

3.2.CLK(Pin 2): clock input, rising edge read data, failling edge output;BfE嘉泰姆

3.3.STB(Pin 3): chip selection signal, failling edge initialization communication;BfE嘉泰姆

3.4.SEG1 ~ SEG11(Pin 5 to 15): Segment output, P tube open drain;BfE嘉泰姆

3.5.GRID1 ~ GRID4(Pin 20~21, 23~24): bit output, N tube open drain;BfE嘉泰姆

3.6.SEG12/GRID7 ~ SEG14/GRID5(Pin 16 to 18): Segment/bit multiplexing output;BfE嘉泰姆

3.7.VDD(Pin 4): The Logic power supply is positive;BfE嘉泰姆

3.8.GND(Pins 19, 22): logically.BfE嘉泰姆

IV. Instruction system details

Commands are used to set the display mode and the status of the LED driver.BfE嘉泰姆
The first byte entered by DIN after STB failling edge is used as the instruction. After decoding, the highest bits of B7 and B are taken to distinguish different instructions.BfE嘉泰姆
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If STB is set to high during instruction or data transmission, serial communication is initialized and the instruction or data being transmitted is invalid (previously transmittedBfE嘉泰姆
The command or data remains valid.

The command is input in the first byte after STB failling edge by DIN. Four instruction types are distinguished by B7 and B6:BfE嘉泰姆

4.1 Display mode settings(B7 = 0, B6 = 0): configure display segments and digits, such as 4-bit 14-bit and 7-bit 11-bit segments;BfE嘉泰姆
This command is used to set the number of selected segments and bits (4 to 7 bits, 11 to 14 segments). When the instruction is executed, the display is forcibly closed. InBfE嘉泰姆
When the display mode is unchanged, the data in the video memory will not be changed, and the display control command controls the Display switch. When power on, the default display mode is 7-bit 11BfE嘉泰姆
Segment.BfE嘉泰姆

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4.2. Data command settings(B7 = 0, B6 = 1): control data read/write mode, address mode and test mode;BfE嘉泰姆
This command is used to set data write and read. Bits B1 and B0 cannot be set to 01 or 11.BfE嘉泰姆
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4.3. Display control commands(B7 = 1, B6 = 0): Control Display switch and 8-level brightness adjustment;BfE嘉泰姆
This command is used to set the Display switch and display brightness adjustment. A total of 8 levels of brightness are available for adjustment.BfE嘉泰姆
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4.4. Address command settings(B7 = 1, B6 = 1): Set the display register address, ranging from 00h to 0DH.BfE嘉泰姆
This command is used to set the address of the display register. The maximum valid address is 14 bits (00H-0DH). If the address is set to 0EH or higher, the data isBfE嘉泰姆
Ignore until the valid address is set. When power on, the address is set to 00h by default.BfE嘉泰姆

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5. Display register structure and address mapping

The chip has a built-in 14-byte display register (00H ~ 0DH), and each address corresponds to a GRID and its associated SEG signal. Data writing should start with a low position and operate in incremental or fixed address mode.We recommend that you write 0x 00 to all video memory addresses after power-on to avoid random data causing garbled codes..BfE嘉泰姆

This register stores data transmitted from external devices to CXLE88139N through the serial interface. The maximum valid address is 14 bytes from 00H-0DH,BfE嘉泰姆
Corresponding to the SEG and GRID pins of the chip respectively, the specific allocation is shown in figure (2):BfE嘉泰姆
When writing LED display data, the data bytes are operated from low to high according to the display address.BfE嘉泰姆
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▲Note: the value stored in the chip display register at the moment of power-on may be randomly uncertain. At this time, the customer directly sends the Open Screen command,BfE嘉泰姆
Garbled codes may appear. Therefore, we recommend that the customer power on the display register for clear operation at a time, that is, the 14-bit memory address after power-on.BfE嘉泰姆
0x 00 is written to all data in (00H-0DH).BfE嘉泰姆

VI. Driving method of co-Yin and co-Yang digital tube

6.1. Total Yin digital tube:

6.1.1)SEG is connected to LED anode and GRID is connected to cathode;BfE嘉泰姆
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Figure 7 shows the connection diagram of the co-negative digital tube. If the digital tube is displayed with "0", you only need to open it from the low position to the 00H(GRID1) address.BfE嘉泰姆
Start writing 0x3F data. At this time, the data corresponding to each SEG1-SEG8 is as follows.BfE嘉泰姆
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6.1.2) to display "0", 0 x3F must be written to GRID1(00h).BfE嘉泰姆

6.2. Co-Yang digital tube:

6.2.1)SEG is still connected to anode and GRID is connected to cathode (note that it cannot be connected in reverse);BfE嘉泰姆
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Figure 8 shows the connection diagram of the co-Yang digital tube. If you let the digital tube display "0", you need to address units 00H(GRID1), 02H(GRID2),BfE嘉泰姆
04H(GRID3), 06H(GRID4), 08H(GRID5), and 0AH(GRID6) respectively write data for 01h, and the remaining addresses 0CH(GRID7) all write data.BfE嘉泰姆
According to 00h. The data corresponding to each SEG1-SEG8 is shown in the following table.BfE嘉泰姆
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▲Note: whether driving the common cathode digital tube or driving the common anode digital tube, SEG pin can only be connected to the LED anode, GRID can only be connected to the LED cathode, noBfE嘉泰姆
It can be connected in reverse.BfE嘉泰姆

6.2.2) when "0" is displayed, 01h must be written to multiple GRID addresses, and 00h must be written to the rest addresses.BfE嘉泰姆

VII. Serial data transmission format

Data is sampled on the rising edge of CLK, and STB failling Edge starts communication. Two transmission modes are supported:BfE嘉泰姆

7.1. Automatic address addition mode: After the start address is set, up to 14 bytes of data are continuously transmitted;BfE嘉泰姆
Using the automatic address plus 1 mode, setting the address is actually the starting address of the transmitted data stream. The start address command word has been sent,BfE嘉泰姆
"STB" does not need to be set to high to transfer data immediately. The maximum value is 14 bytes. The "STB" is set to high only after data transmission is completed.BfE嘉泰姆
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Command1: Set the display modeBfE嘉泰姆
Command2: set data commandsBfE嘉泰姆
Command3: Set the display addressBfE嘉泰姆
Data1 ~ n: transmit display data to the Command3 address and the following address (up to 14bytes)BfE嘉泰姆
Command4: Display Control commandsBfE嘉泰姆

7.2. Fixed Address mode: You must reset the address for each byte of data transmitted.BfE嘉泰姆
Using the fixed address mode, setting the address is actually setting the address where the 1byte data to be transmitted is stored. The address has been sent, "STB"BfE嘉泰姆
You do not need to set the value to high. The data is transmitted immediately after 1byte. The STB value is set to high only after the data is transmitted. Then reset the address where the second data needs to be stored,BfE嘉泰姆
Up to 14 bytes of data has been transferred, and the STB is set to high.BfE嘉泰姆
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Command1: Set the display modeBfE嘉泰姆
Command2: set data commandsBfE嘉泰姆
Command3: set display address 1BfE嘉泰姆
Data1: transfer display data from 1 to Command3 addressesBfE嘉泰姆
Command4: set display address 2BfE嘉泰姆
Data2: transfer display data from 2 to Command4 addressesBfE嘉泰姆
Command5: Display Control commandsBfE嘉泰姆
7.3. Receive 1 BIT to operate on the rising edge of the clock.BfE嘉泰姆
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7.4. Program design flow chart using automatic address plus one and fixed address:BfE嘉泰姆

7.4.1) program design flow chart using automatic address plus one:BfE嘉泰姆

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7.4.2) program design flow chart with fixed address:BfE嘉泰姆

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VIII. Typical application circuit design

8.1. Co-negative digital tube driver circuit (Figure 18):

8.1.1) add filter capacitor between VDD and GND, close to the chip;BfE嘉泰姆

8.1.2)DIN, CLK, STB port plus 100pF pull-down capacitor anti-interference;BfE嘉泰姆

8.1.3) it is recommended to supply 5V power, especially driving blue light digital tube (the voltage drop is about 3V).BfE嘉泰姆

8.2. Co-Yang digital tube driver circuit (Figure 19):

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▲Note: 1. Filter capacitor wiring between VDD and GND should be placed as close to PCB board chip as possible to enhance the filtering effect.BfE嘉泰姆
2. Connecting three 100pF capacitors to DIN, CLK and STB communication ports up and down can reduce the interference to communication ports.BfE嘉泰姆
3. Since the conduction voltage of blue light digital tube is reduced by about 3V, 5V should be selected for CXLE88139N power supply.

8.2.1) similar structure, note that the connection between SEG and GRID remains unchanged;BfE嘉泰姆

8.2.2) also pay attention to the filtering and anti-interference design of power supply and signal line.BfE嘉泰姆

IX. Electrical parameters and performance indicators

9.1. Limit parameters (Ta = 25℃, Vss = 0V):

9.1.1) power supply voltage:-0.5V ~ 7.0VBfE嘉泰姆

9.1.2) Operating temperature:-40℃ ~ 85℃BfE嘉泰姆

9.1.3)ESD withstand voltage: HBM 2000V,MM 200VBfE嘉泰姆

9.2. Normal operating range (Vss = 0V):

9.2.1)VDD:3V to 6V (typical 5V)BfE嘉泰姆

9.2.2 High input: 0.7VDD to VDDBfE嘉泰姆

9.2.3) low-level input: 0V to 0.3VDDBfE嘉泰姆

9.4. Electrical characteristics (VDD = 5V, VSS = 0V)

9.3. Switch characteristics:

9.3.1) maximum clock frequency: 1MHzBfE嘉泰姆

9.3.2) transmission delay:<300nsBfE嘉泰姆

9.3.3) rise/fall Time:<2 secondsBfE嘉泰姆

9.4. Time series characteristics (VDD = 5V)BfE嘉泰姆

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9.5. Time Series Waveform diagram:BfE嘉泰姆

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X. Package size and mechanical specifications

10.1.SOP24: total length mm, foot distance mm, suitable for general PCB layout;BfE嘉泰姆

10.2.QSOP24: smaller size, total length mm, foot distance mm, suitable for high density installation.BfE嘉泰姆

Xi. Summary

CXLE88139N is a fully functional and flexible LED driver control chip, especially suitable for multi-bit digital tube display occasions. Its rich display mode, flexible brightness adjustment, strong anti-interference ability and simple three-wire serial interface make it an ideal choice in the fields of household appliances, industrial instruments, etc. Attention should be paid to the initialization of video memory, power filtering and signal integrity during design to ensure stable and reliable display effect.BfE嘉泰姆

Note: This article is based on the CXLE88139N Data Manual. For reference only, please refer to the latest official information.BfE嘉泰姆

12. Relevant chip selection guideMore similar products.....BfE嘉泰姆

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