In modern electronic equipment, LED display is widely used in various consumer electronic products because of its high brightness, low power consumption and long life. CXLE88134N is a drive control chip designed for LED displays, which integrates MCU digital interface, data latch and high-voltage drive circuit, and is suitable for display drivers of VCR, VCD, DVD and home theater devices. The chip uses an advanced power CMOS process, with high performance and reliability, and supports multiple display modes and brightness adjustment functions.
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[ CXLE88134N ]"
Introduction
In modern electronic equipment, LED display is widely used in various consumer electronic products because of its high brightness, low power consumption and long life. CXLE88134N is a drive control chip designed for LED displays, which integrates MCU digital interface, data latch and high-voltage drive circuit, and is suitable for display drivers of VCR, VCD, DVD and home theater devices. The chip uses an advanced power CMOS process, with high performance and reliability, and supports multiple display modes and brightness adjustment functions.
First, the characteristics of an overview
CXLE88134N have the following outstanding features:
1.1. Display modeSupport 7 x 4-bit display format, to meet the needs of most digital tube display.
1.2. brightness adjustment: Built-in 8-level duty cycle adjustable brightness control circuit, users can adjust the display brightness according to the ambient light.
1.3. Serial interface: Communication with MCU through CLK, STB and DIN three-wire serial interface, simple interface and fast response.
1.4. Built-in oscillator: Integrated RC oscillator circuit, typical frequency is 450kHz ± 5%, no external crystal is required.
1.5. Power-on Reset: Built-in power-on reset circuit to ensure that the state of the system is controllable when starting.
1.6. Encapsulation form: Provide SOP16 and DIP 800.00g packages to facilitate PCB layout in different application scenarios.
Second, pin function details
Third, instruction set and display control
The first byte entered by DIN after the falling edge of the STB is used as a command. After decoding, the highest B7 and B 300.00g bits are taken to distinguish
different instructions.
If STB is set to high level during instruction or data transmission, serial communication is initialized and the instruction or data being transmitted is invalid (
previously transmitted instructions or data remain valid).
The CXLE88134N supports four types of instructions, sent through the serial interface, and the instruction format is distinguished by B7 and B6 bits:
3.1. Display Mode Settings(B7 = 0, B6 = 0) is used to configure the number of display segments and bits. The default mode is 7 segments and 4 bits.
This instruction is used to set the number of selected segments and bits. Although the CXLE88134N does not have a segment multiplexing pin, it is necessary to write a mode command when writing a program.
; When the instruction is executed, the display is forced to close. To send the display control command to turn on the display, the original displayed data content will not be changed, but when the phase
This does not occur when the same mode is set. At power-up, the default setting mode is 7-bit 11-segment.
3.2. Data Command Settings(B7 = 0, B6 = 1) Set the data read and write mode, support automatic address increase or fixed address mode.
3.3. Address Command Settings(B7 = 1, B6 = 1) Set the storage address of the display data, and support addresses such as 00H, 02H, 04H, and 06H.
This instruction is used to set the address of the display register.
There are 14 video memory addresses 00H-0DH in the CXLE88134N, and only 00H,02H,04H,06H are actually used. If the address is used automatically
Add 1 mode, other addresses can write 0, the address is set to 0EH or higher, the data is ignored until the effective address is set.
At power-on, the first address is set to 00H by default.
3.4. Display control commands.(B7 = 1, B6 = 0) Used to switch display and adjust brightness, support 8-level pulse width modulation (PWM) adjustment.
3.5. Display drive common negative digital tube
Fig. 3 shows the connection diagram of the common digital tube. if the digital tube displays "0", then you need to let GRID1 be low
SEG1,SEG2,SEG3,SEG4,SEG5,SEG6 are high, SEG7 is low,
Look at the memory address table, just write data 3FH in the 00H address unit to make the digital tube display "0".
Four, data transmission format
The chip supports two data transfer modes:
4.1. Address automatic increase mode.: After setting the start address, multiple bytes of data are continuously written, and the address is automatically incremented.
Using the address automatic plus 1 mode, setting the address is actually setting the starting address for storing the transmitted data stream. Start Address Command Word Send
After that, "STB" does not need to be set high followed by data transmission. After data transmission, "STB" is set high. There are 14 video memory addresses 00H-0DH inside.
, only 00H,02H,04H,06H are actually used. If the address automatically adds 1 mode is used, other addresses can write 0, and the address is set to 0EH or
Higher, data is ignored
Command1: setting display modes
Command2: Set Data command
Command3: setting display address
Data1 to Datan: Transmit display data to the Command3 address and the following address
Command4: Display Control Commands
4.2. Fixed address mode.: The address needs to be reset every time one byte of data is written.
Using the fixed address mode, setting the address is actually setting the address where the data needs to be transferred. Address sent, "STB" does not need
To set it high, 1BYTE data is transmitted immediately, and "STB" is set high only after data transmission is completed. Then reset the address where the second data needs to be stored.
, then transmit 1BYTE data, and set "STB" high after data transmission, and so on.
Command1: setting display modes
Command2: Set Data command
Command3: Set display address 1
Data1: Transmit display data 1 to Command3 address
Command4: Set display address 2
Data2: Transmit display data 2 to Command4 address
Command5: Display Control Commands
4.3. Data reception (write data) timing diagram
Data is sampled on the rising edge of CLK and the falling edge of STB marks the start of a command or data transfer.
4.4. Program design flowchart.
4.4.1) Program design flow chart using address automatic plus 1.
4.4.2) Program design flow chart with fixed address.
Fifth, the application of circuit design
CXLE88134N commonly used to drive a common negative digital tube. The following are the design points of a typical application circuit:
5.1. Power supply filtering: A filter capacitor (such as 100 & micro;F electrolytic capacitor and 104 tile capacitor) should be placed nearby between VDD and GND to enhance anti-interference ability.
5.2. Communication line filtering: 100pF capacitors are connected in series on DIN, CLK and STB lines, which can effectively suppress communication interference.
5.3. Drive current: SEG pin drive current can reach 25mA (typical value),GRID pin absorption current can reach 140mA, which can directly drive most digital tubes.
5.4. Supply voltage: It is recommended to use 5V power supply, especially when driving blue LED (conduction voltage drop of about 3V).
Six, electrical parameters and performance
The CXLE88134N can work stably in a wide voltage range (4.5V-5.5V) and temperature range (-40 ℃ to 85 ℃). Its main electrical characteristics include:
6.1.SEG output current: 30mA typical when Vo = VDD-3V
6.2.GRID Suction CurrentWhen Vo = 0.3V, the typical value is 140mA
6.3. Maximum clock frequency：1MHz
6.4. Power consumption: Dynamic current is less than 5mA (when there is no load)
6.5. Limit parameters (Ta = 25 ℃, Vss = 0V)
6.6. Normal operating range (Vss = 0V)
6.7. Electrical characteristics (VDD = 4.5~5.5V, Vss = 0V)
6.8. Switching characteristics (VDD = 4.5~5.5V)
6.9 timing characteristics (VDD = 4.5~5.5V)
6.10. Timing waveform diagram
Seven, package information
CXLE88134N offers two packaging options:
7.1.SOP16: Suitable for high-density PCB layout, small size and good heat dissipation.
7.2.DIP16: Suitable for prototype development and educational applications, easy to plug and unplug.
Eight,Conclusion
CXLE88134N is a full-featured, stable performance LED driver control chip, especially suitable for consumer electronics digital tube display driver. Its flexible serial interface, multi-level brightness adjustment and powerful driving capability make it an ideal choice for VCD, DVD, home theater and other equipment. Designers can choose automatic address mode or fixed address mode according to actual needs, and combined with the recommended circuit design to achieve a stable and reliable display system.
Nine, the relevant chip selection guide More similar products.....
| Model | Number of Interfaces | Number of driving lattice | Segment/Bit | Common Yin Drive | Gongyang drive | Key | Encapsulation form | Remarks |
| CXLE88134N | 3 | 28 | 7*4 | Section 7, 4 digits | - | - | SOP16/DIP16 | LED panel display driver chip |
| CXLE88135N | 3 | 21 | 8*2/7*3 | 8 segments 2 bits/7 segments 3 bits | - | 6*1 | SOP16 | LED panel display driver chip |
| CXLE88136N | 3 | 35 | 5*7/8*4 | 7-segment 5-bit/8-segment 4-bit | Segment 7, position 5 | 5*1 | SOP18/DIP18 | LED panel display driver chip |
| CXLE88137BN | 3 | 48 | 6*7/9*4 | 7 segments 6 bits/9 segments 4 bits | Segment 7, 6 digits | 6*1 | SOP20 | LED panel display driver chip |
| CXLE88137N | 3 | 48 | 8*6/10*4 | 8 segments 6 bits/10 segments 4 bits | - | - | SOP20 | LED panel display driver chip |
| CXLE88138C | 4 | 77 | 11*7/14*4 | 11 segment 7 bits/14 segment 4 bits | Section 7, position 11 | 10*3 | SOP32 | LED panel display driver chip |
| CXLE88138N | 4 | 77 | 11*7/14*4 | 11 segment 7 bits/14 segment 4 bits | Section 7, position 11 | 10*3 | SOP32 | LED panel display driver chip |
| CXLE88139N | 3 | 77 | 11*7/14*4 | 11 segment 7 bits/14 segment 4 bits | Section 7, position 11 | - | SOP24/QSOP24 | LED panel display driver chip |
| CXLE88141N | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88142A | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88142E | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88143AN | 3 | 128 | 16*8 | 16 Segment 8 Bits | 8 Segments 16 Bits | - | SOP32 | LED panel display driver chip |
| CXLE88143BN | 3 | 112 | 14*8 | Segment 14, 8 bits | 8 Segment 14 Bits | 8*2 | SOP32 | LED panel display driver chip |
| CXLE88143CN | 3 | 120 | 15*8 | Segment 15, 8 bits | Segment 8, bit 15 | 8*1 | SOP32 | LED panel display driver chip |
| CXLE88143DN | 3 | 96 | 12*8 | 12 Segment 8 Bits | Segment 8, 12 bits | 8*4 | SOP32 | LED panel display driver chip |
| CXLE88143N | 4 | 128 | 16*8 | 16 Segment 8 Bits | 8 Segments 16 Bits | 8*4 | QFP44 | LED panel display driver chip |
| CXLE88147N | 3 | 80 | 10*8 | Segment 10, 8 bits | 8 Segment 10 Bits | 8*3 | SOP28 | LED panel display driver chip |
| CXLE88148N | 3 | 64 | 8*8 | 8 Segment 8 Bits | Section 8, 6 digits | 4*2 | SOP24/QSOP24 | LED panel display driver chip |
| CXLE88149B | 2 | 128 | 8*16 | 8 Segments 16 Bits | 16 Segment 8 Bits | - | SOP28、SSOP28 | LED panel display driver chip |
| CXLE88155N | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*2 | SOP24/SSOP24/SDIP24 | LED panel display driver chip |
| CXLE88171 | 4 | 77 | 11*7/14*4 | 11 segment 7 bits/14 segment 4 bits | Section 7, position 11 | 10*3 | SOP32 | LED panel display driver chip |
| CXLE88172 | 2 | 128 | 8*16 | 8 Segments 16 Bits | 16 Segment 8 Bits | - | SOP24 | LED panel display driver chip |
| CXLE88173 | 2 | 144 | 8*9*2 | forward and reverse push digital tube | forward and reverse push digital tube | - | QSOP24 | LED panel display driver chip |
| CXLE88174 | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | Touch keys 8 | SOP32 | LED panel display driver chip |
| CXLE88175 | 5 | 120 | 15*8 | Segment 15, 8 bits | Segment 8, bit 15 | 8*1/8 | QFN48 | LED panel display driver chip |
| CXLE88176 | 3 | 77 | 11*7/14*4 | 11 segment 7 bits/14 segment 4 bits | Section 7, position 11 | 10*1 | SOP24 | LED panel display driver chip |
| CXLE88156 | 3 | 128 | 8*16 | 8 Segments 16 Bits | 16 Segment 8 Bits | - | SOP32 | LED panel display driver chip |
| CXLE88134 | 3 | 28 | 7*4 | Section 7, 4 digits | - | - | SOP16/DIP16 | LED panel display driver chip |
| CXLE88135 | 3 | 21 | 8*2/7*3 | 8 segments 2 bits/7 segments 3 bits | - | 6*1 | SOP16 | LED panel display driver chip |
| CXLE88136 | 3 | 35 | 5*7/8*4 | 7-segment 5-bit/8-segment 4-bit | Segment 7, position 5 | 5*1 | SOP18/DIP18 | LED panel display driver chip |
| CXLE88137 | 3 | 48 | 8*6/10*4 | 8 segments 6 bits/10 segments 4 bits | - | - | SOP20 | LED panel display driver chip |
| CXLE88137A | 3 | 48 | 6*7/9*4 | 7 segments 6 bits/9 segments 4 bits | Segment 7, 6 digits | 6*1 | SOP20 | LED panel display driver chip |
| CXLE88138 | 4 | 77 | 11*7/14*4 | 11 segment 7 bits/14 segment 4 bits | Section 7, position 11 | 10*3 | SOP32 | LED panel display driver chip |
| CXLE88139 | 3 | 77 | 11*7/14*4 | 11 segment 7 bits/14 segment 4 bits | Section 7, position 11 | - | SOP24/QSOP24 | LED panel display driver chip |
| CXLE88140A | 4 | 77 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*1 | SOP32 | LED panel display driver chip |
| CXLE88140B | 3 | 77 | 11*7/14*4 | 11 segment 7 bits/14 segment 4 bits | Section 7, position 11 | 10*3 | QFP44 | LED panel display driver chip |
| CXLE88141 | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88142 | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88143 | 4 | 128 | 16*8 | 16 Segment 8 Bits | 8 Segments 16 Bits | 8*4 | QFP44 | LED panel display driver chip |
| CXLE88143A | 3 | 128 | 16*8 | 16 Segment 8 Bits | 8 Segments 16 Bits | - | SOP32 | LED panel display driver chip |
| CXLE88143B | 3 | 112 | 14*8 | Segment 14, 8 bits | 8 Segment 14 Bits | 8*2 | SOP32 | LED panel display driver chip |
| CXLE88143C | 3 | 120 | 15*8 | 15段8位 | Segment 8, bit 15 | 8*1 | SOP32 | LED panel display driver chip |
| CXLE88143D | 3 | 96 | 12*8 | 12 Segment 8 Bits | Segment 8, 12 bits | 8*4 | SOP32 | LED panel display driver chip |
| CXLE88144 | 3 | 35 | 7*5/8*4 | 7-segment 5-bit/8-segment 4-bit | - | 7*1 | DIP18 | LED panel display driver chip |
| CXLE88145 | 2 | 32 | 8*4 | - | Segment 8 4 bits | 8*2 | DIP18 | LED panel display driver chip |
| CXLE88146 | 2 | 48 | 8*6 | - | Section 8, 6 digits | 8*2 | SOP20/DIP20 | LED panel display driver chip |
| CXLE88147 | 3 | 80 | 10*8 | Segment 10, 8 bits | 8 Segment 10 Bits | 8*3 | SOP28 | LED panel display driver chip |
| CXLE88148 | 3 | 64 | 8*8 | 8 Segment 8 Bits | Section 8, 6 digits | 4*2 | SOP24/QSOP24 | LED panel display driver chip |
| CXLE88149 | 2 | 128 | 8*16 | 8 Segments 16 Bits | 16 Segment 8 Bits | - | SOP28/SSOP28 | LED panel display driver chip |
| CXLE88150 | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88151 | 2 | 32 | 8*4 | 8-segment 4-bit/7-segment 4-bit | - | 7*4 | SOP16/DIP16 | LED panel display driver chip |
| CXLE88152 | 2 | 28 | 7*4 | - | Section 7, 4 digits | 7*1 | SOP16/DIP16 | LED panel display driver chip |
| CXLE88153 | 1 | 40 | 7*6/8*5 | 7-segment 6-bit/8-segment 5-bit | 6 segments 7 bits/5 segments 8 bits | - | SOP16 | LED panel display driver chip |
| CXLE88154 | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*2 | SOP28 | LED panel display driver chip |
| CXLE88155 | 3 | 70 | 10*7/13*4 | 10 segments 7 bits/13 segments 4 bits | Segment 7, 10 digits | 10*2 | SOP24/SSOP24/SDIP24 | LED panel display driver chip |
| CXLE88133 | 2 | 256 | 32*8/24*16 | 32 segment 8 bit/24 segment 16 bit | 8 segment 32 bit/16 segment 24 bit | - | LQFP48/LQFP52 | LED panel display driver chip |
| CXLE88132 | 4 | 256 | 32*8/24*16 | 32 segment 8 bit/24 segment 16 bit | 8 segment 32 bit/16 segment 24 bit | - | LQFP48/LQFP52 | LED panel display driver chip |
