CXLE88148N is a dedicated control chip that integrates LED display drivers and keyboard scanning functions. It is manufactured using CMOS technology and has high reliability, strong anti-interference ability, and a compact design structure. The chip integrates MCU digital interface, data latch, LED driver circuit, and 4 × 2 keyboard scanning module, which is suitable for various digital tubes or LED display devices. It is widely used in home appliances and industrial equipment such as smart water heaters, microwave ovens, washing machines, air conditioners, induction cookers, set-top boxes, electronic scales, smart meters, etc.
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[ CXLE88148N ]"
Comprehensive Analysis and Application Guide for CXLE88148N LED Driver Chip with Keyboard Scanning
1、 Chip Overview
CXLE88148N is a dedicated control chip that integrates LED display drivers and keyboard scanning functions. It is manufactured using CMOS technology and has high reliability, strong anti-interference ability, and a compact design structure. The chip integrates MCU digital interface, data latch, LED driver circuit, and 4× 2 keyboard scanning module, suitable for various digital tubes or LED display devices, widely used in home appliances and industrial equipment such as smart water heaters, microwave ovens, washing machines, air conditioners, induction cookers, set-top boxes, electronic scales, smart meters, etc.
CXLE88148N supports 8 segments× 8-bit display mode, with 8-level duty cycle adjustable brightness adjustment function, supporting three wire serial communication interfaces (CLK, STB, DIO), built-in RC oscillator and power on reset circuit, providing SOP24 and QSOP24 packaging forms, especially suitable for space limited application scenarios.
2、 Main characteristics
▲ Display capability: 8 segments× 8-digit LED display, supporting co negative/co positive digital tubes
▲ Keyboard scanning：4× 2 matrix buttons, automatic scanning, no need for external MCU intervention
▲ Brightness adjustment8 levels of pulse width adjustable (1/16~14/16)
▲ Communication interfaceThree wire serial interface (CLK, STB, DIO), supporting data read/write and key read
▲ Built in optimizationBuilt in data latch and anti-interference circuit, suitable for harsh environments
▲ Packaging form：SOP24、QSOP24， Suitable for high-density PCB layout
▲ Power supply range：3.0V~5.5V， Typical 5V power supply
3、 Detailed explanation of pin functions
| symbol | pin name | Pin number | Instructions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| DIO | Data output input | six | Input serial data on the rising edge of the clock, starting from the lower bits. Output serial data on the falling edge of the clock, starting from the lower bits. When outputting, it is an N-tube open leak output | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| CLK | Clock input | seven | Read serial data on the rising edge and output data on the falling edge. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| STB | Film selection input | eight | Initialize the serial interface at the falling edge and then wait for the instruction to be received. The first byte after the low value of STB is used as an instruction, and when processing the instruction, other current processing is terminated. When STB is high, CLK is ignored. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| K0～K1 | Key scan signal input | 9~10 | The data input for this foot is displayed after the end of the cycle latch |
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| SGE1/KS1～ SEG4/KS4 | Output (segment) | 12~15 | Segment output (also used as key scan output), P-tube open leak output | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| GRID1～GRID8 | Output (bit) | 1~5 20~24 |
Bit output, N-tube open leak output | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| SEG9 ～SEG12 | Output (segment) | 16~19 | Segment output, P-tube leakage output | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| VDD | Logic power supply | eleven | Connect the power supply positively | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| GND | Logically speaking | 3. 22 | Grounding system | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
AttentionThe DIO port is an open drain output, and an external 1k&Omega is required to read the key; ~10kΩ Pull up resistor, recommended 10kΩ. Data is more stable when read on the rising edge of the clock.
When the DIO port outputs data, it is an N-tube open drain output. When reading keys, an external pull-up resistor of 1K-10K is required. Our company recommends 10K
Pull the resistor. DIO controls the action of N tube during the falling edge of the clock, and the reading is unstable at this time. It only stabilizes during the rising edge of the clock.
4、 Detailed Explanation of Instruction System
Instructions.
| B7 | B6 | command | |||||||||||||||||||||||||||||||||||||||||||||
| 0 | one | Data command settings | |||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | Display control command settings | |||||||||||||||||||||||||||||||||||||||||||||
| one | one | Address Command Settings | |||||||||||||||||||||||||||||||||||||||||||||
If the STB is set to high level during instruction or data transmission, serial communication is initialized, and the instruction or data being transmitted is invalid (before that)
The instructions or data sent remain valid.
CXLE88148N achieves display and button control through three instructions:
4.1. Data command settings (B7 B6=01)
Set data read/write mode, address mode, and working mode.
| B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | function | Instructions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | one | Unrelated item, fill in 0 | 0 | 0 | Data read-write mode setting | Write data to the display register | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | one | one | 0 | Read key to scan data | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | one | 0 | Address increase mode setting | Automatic address addition | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | one | one | fixed address | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | one | 0 | Test mode setting (For internal use) |
Normal Mode | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | one | one | test mode | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
2. Address command setting (B7 B6=11)
Set the starting address of the display register (00H~0FH), totaling 16 bytes.
| B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | display address | |||||||||||||||||||||||||||||||||||||||
| one | one | Unrelated item, fill in 0 | 0 | 0 | 0 | 0 | 00H | ||||||||||||||||||||||||||||||||||||||||
| one | one | 0 | 0 | 0 | one | 01H | |||||||||||||||||||||||||||||||||||||||||
| one | one | 0 | 0 | one | 0 | 02H | |||||||||||||||||||||||||||||||||||||||||
| one | one | 0 | 0 | one | one | 03H | |||||||||||||||||||||||||||||||||||||||||
| one | one | 0 | one | 0 | 0 | 04H | |||||||||||||||||||||||||||||||||||||||||
| one | one | 0 | one | 0 | one | 05H | |||||||||||||||||||||||||||||||||||||||||
| one | one | 0 | one | one | 0 | 06H | |||||||||||||||||||||||||||||||||||||||||
| one | one | 0 | one | one | one | 07H | |||||||||||||||||||||||||||||||||||||||||
| one | one | one | 0 | 0 | 0 | 08H | |||||||||||||||||||||||||||||||||||||||||
| one | one | one | 0 | 0 | one | 09H | |||||||||||||||||||||||||||||||||||||||||
| one | one | one | 0 | one | 0 | 0AH | |||||||||||||||||||||||||||||||||||||||||
| one | one | one | 0 | one | one | 0BH | |||||||||||||||||||||||||||||||||||||||||
| one | one | one | one | 0 | 0 | 0CH | |||||||||||||||||||||||||||||||||||||||||
| one | one | one | one | 0 | one | 0DH | |||||||||||||||||||||||||||||||||||||||||
| one | one | one | one | one | 0 | 0EH | |||||||||||||||||||||||||||||||||||||||||
| one | one | one | one | one | one | 0FH | |||||||||||||||||||||||||||||||||||||||||
This instruction is used to set the address of the display register.
If the address is set to 10H or higher, the data is ignored until a valid address is set. When powered on, the address is set to 00H by default.
3. Display control commands (B7 B6=10)
Control the display switch and brightness adjustment.
| B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | function | Instructions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | Unrelated item, fill in 0 | 0 | 0 | 0 | Extinction quantity setting | Set the pulse width to 1/16 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | 0 | 0 | one | Set the pulse width to 2/16 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | 0 | one | 0 | Set the pulse width to 4/16 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | 0 | one | one | Set the pulse width to 10/16 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | one | 0 | 0 | Set the pulse width to 11/16 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | one | 0 | one | Set the pulse width to 12/16 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | one | one | 0 | Set the pulse width to 13/16 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | one | one | one | Set the pulse width to 14/16 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | 0 | Display switch settings | Display off | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| one | 0 | one | Display on | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
5、 Display and keyboard scanning function
This register stores data transmitted from external devices to CXLE88148N via a serial interface, with addresses ranging from 00H-0FH and a total of 16 byte units, respectively associated with the chip
The LED lights connected to the SEG and GRID pins of the chip correspond to the following allocation:
When writing LED display data, follow the operation from low to high of the display address and from low to high of the data byte.
| SEG1 | SEG2 | SEG3 | SEG4 | X | X | X | X | SEG9 | SEG10 | SEG11 | SEG12 | X | X | X | X | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| XxHL (lower four digits) | XxHU (high four digits) | XxHL (lower four digits) | XxHU (high four digits) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| B0 | B1 | B2 | B3 | B4 | B5 | B6 | B7 | B0 | B1 | B2 | B3 | B4 | B5 | B6 | B7 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 00HL | 00HU | 01HL | 01HU | GRID1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 02HL | 02HU | 03HL | 03HU | GRID2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 04HL | 04HU | 05HL | 05HU | GRID3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 06HL | 06HU | 07HL | 07HU | GRID4 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 08HL | 08HU | 09HL | 09HU | GRID5 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0AHL | 0AHU | 0BHL | 0BHU | GRID6 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0CHL | 0CHU | 0DHL | 0DHU | GRID7 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0EHL | 0EHU | 0FHL | 0FHU | GRID8 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
▲ Attention:The value stored inside the chip display register at the moment of power on may be random and uncertain. In this case, the customer directly sends a screen open command,
There may be display garbled characters. So our company suggests that the customer perform a power on reset operation on the display register, that is, to reset the 16 bit video memory address after power on
All data 0x00 is written in (00H-0FH).
5.2. Display driver
5.2.1) Common cathode digital tubeSEG is connected to the anode, GRID is connected to the cathode, and segment selection is controlled by writing video memory data.
Figure 7 shows a schematic diagram of the connection of a common cathode digital tube. If the digital tube displays“ 0” Just need to start from the lower order in the 00H (GRID1) address
Start writing 0x3F data, and the data for each SEG1-SEG8 corresponding to 00H is shown in the table below.
| SEG8 | SEG7 | SEG6 | SEG5 | SEG4 | SEG3 | SEG2 | SEG1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | 0 | one | one | one | one | one | one | GRID1(00H) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
5.2.2) Common anode digital tubeAn external PNP or MOS transistor is required for level conversion, and the GRID control bit is selected.
Figure 8 shows the schematic diagram of the connection of the common anode digital tube. If the digital tube displays“ 0” , need to address units 00H (GRID1), 02H (GRID2)
Write data 01H in 04H (GRID3), 06H (GRID4), 08H (GRID5), and 0AH (GRID6) respectively, and the remaining addresses 0CH (GRID7) and 0EH (GRID8)
All units are written with data 00H. The data corresponding to each SEG1-SEG8 is shown in the table below.
| SEG8 | SEG7 | SEG6 | SEG5 | SEG4 | SEG3 | SEG2 | SEG1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | one | GRID1(00H) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | one | GRID2(02H) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | one | GRID3(04H) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | one | GRID4(06H) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | one | GRID5(08H) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | one | GRID6(0AH) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | GRID7(0CH) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | GRID8(0EH) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
5.3. Keyboard scanning
Support 4× 2 matrix buttons, automatic scanning, completed once every display cycle (approximately 4.7ms).
The key scan data storage address is shown in Figure (4). First, send the read key command, and then start reading the key data BYTE1— BYTE2 bytes, read data from
The output starts at a low position, and when the buttons corresponding to the K and KS pins of the chip are pressed, the BIT bit in the corresponding byte is 1.
To read a button, send a read command and sequentially read 2 bytes of data (BYTE1~BYTE2), with each byte corresponding to 2 button states.
| B0 | B1 | B2 | B3 | B4 | B5 | B6 | B7 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| X | X | K1 | K0 | X | X | K1 | K0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| KS1 | KS2 | BYTE1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| KS3 | KS4 | BYTE2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
At this time, in order to read the data of this button, it is necessary to read the 6th bit of the second byte before reading the data; When K1 and KS4, K0 and KS4
When two buttons are pressed simultaneously, the B6 and B7 bits of the data read by BYTE2 are both 1.
3. Combination keys can only be the same KS, and different K pins can be used as combination keys; The same K and different KS pins cannot be used as combination keys
Use it.
One display cycle is required, and one display cycle takes approximately T=4.7ms. Within 4.7ms, two different keys were pressed successively, and the key values read twice were
The key value of the button pressed first.
(2) Combination button
Abnormal problem with composite buttons: SEG1/KS1-SEG8/KS8 is a combination of display and button scanning. Taking Figure (12) as an example, D1 needs to be lit up for display, D2
Extinguish, SEG1 needs to be set to“ 0” , SEG2 is“ 1” If S1 and S2 are simultaneously pressed, it is equivalent to SEG1 and SEG2 being short circuited, and D1 and D2 are both activated
Bright.
1. In terms of hardware, the keys that need to be pressed simultaneously can be set on different K-lines as shown in Figure (13),
▲ Note: It is recommended to use the same KS but different K keys as composite keys.
6、 Communication timing and data transmission
Reading and receiving one BIT are both performed on the rising edge of the clock.
▲ Attention:1. When reading data, an equal interval is required between setting instructions from the 8th rising edge of the serial clock CLK and reading data from the falling edge of CLK
Wait for Twait (minimum 2μ S). Please refer to the timing characteristic table for specific parameters.
6.2. Write data flow (address auto increment mode)
“ STB” There is no need to set it high and transmit data immediately, up to 16BYTE. The data will only be transmitted after it is completed; STB” Set high.
Command1: Set Data Command
Command2: Set Display Address
Data1~n: Transfer display data to Command2 address and subsequent addresses (up to 16 bytes)
Command3: Display Control Commands
▲STB falling edge begins
▲Send data command (automatic address)
▲Send starting address
▲Continuous writing of up to 16 bytes of data
▲STB rising edge ends
6.4. Fixed Address Mode
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”
No need to set it high, immediately transmit 1BYTE data, and only after the data transmission is completed will it be sent; STB” Set high. Then reset the address where the second data needs to be stored,
Up to 16BYTE data transmission completed,“ STB” Set high.
Command1: Set Data Command
Command2: Set Display Address 1
Data1: Transfer display data 1 to Command2 address
Command3: Set Display Address 2
Data2: Transfer display data 2 to Command3 address
Command4: Display control commands
6.5. Read button timing sequence
Command1: Set the read button command
Data1-2: Read key data
6.6. Program design flowchart using automatic address addition and fixed address methods:
6.6.1) Use address auto add one program design flowchart:
6.6.2) Flowchart of program design using fixed addresses:
6.7. Read button process
▲Send read button command
▲Waiting for Twait (≥ 2μ s)
▲Read 2-byte key data sequentially
7、 Hardware design suggestions
7.2. CXLE88148 Common Yang Digital Screen Hardware Circuit Diagram
▲ Attention: 1. The filtering capacitor between VDD and GND should be placed as close as possible to the CXLE88148N chip on the PCB board to enhance the filtering effect.
2. Connecting three 100P capacitors to the DIO, CLK, and STB communication ports can reduce interference to the communication ports.
3. Due to the conduction voltage drop of the blue light digital tube being about 3V, the CXLE88148N power supply should use 5V.
▲ Power filterConnect a 100 μ F electrolytic capacitor and a 104 ceramic capacitor in parallel between VDD and GND, and place them as close to the chip as possible.
▲ Communication protectionConnect 100pF capacitors in parallel to ground on DIO, CLK, and STB lines to suppress high-frequency interference.
▲ Pull up resistorWhen reading the DIO key, connect an external 10kΩ Pull up the resistor.
▲ Driving voltageIf using a blue LED (with a voltage drop of about 3V), it is recommended to supply a voltage of 5V.
▲ Anti interference designStrengthen power and ground shielding in strong interference environments, and communication lines can be connected in series with small resistors.
8、 Summary of Electrical Parameters
| parameter | symbol | scope | unit | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Logic power supply voltage | VDD | -0.5 ～+7.0 | V | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Logic input voltage | VI1 | -0.5 ～ VDD + 0.5 | V | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| LED Seg driver output current | IO1 | -50 | mA | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| LED Grid Drive Output Current | IO2 | +200 | mA | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| power loss | PD | four hundred | mW | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operating Temperature | Topt | -40 ～ +85 | ℃ | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Storage temperature | Tstg | -65 ～+150 | ℃ | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| parameter | symbol | minimum | typical | maximum | unit | test conditions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Logic power supply voltage | VDD | five | V | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| High level input voltage | VIH | 0.7 VDD | - | VDD | V | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Low level input voltage | VIL | 0 | - | 0.3 VDD | V | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
8.3. Electrical characteristics (VDD=4.5~ 5.5 V, VSS=0 V)
| parameter | symbol | minimum | typical | maximum | unit | test conditions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| SEG Drive Pulling Current | Ioh1 | twenty | twenty-five | forty | mA | SGE1～SEG12 Vo = VDD-2V | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ioh2 | twenty | thirty | fifty | mA | SGE1～SEG12 Vo = VDD-3V | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Grid driven current injection | IOL1 | eighty | one hundred and forty | - | mA | GRID1-GRID8 Vo=0.3V | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Output pull-down resistor | RL | ten | KΩ | K0～K1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| input current | II | - | - | ± one | μA | VI = VDD / VSS | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| High level input voltage | VIH | zero point seven VDD |
- | V | CLK，DI0，STB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Low level input voltage | VIL | - | - | zero point three VDD |
V | CLK，DI0，STB | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lagging voltage | VH | - | zero point three five | - | V | CLK，DI0，STB | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Dynamic current loss | IDDdyn | - | - | five | mA | No load, display off | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| parameter | symbol | minimum | typical | maximum | unit | test conditions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| oscillation frequency | fosc | - | five hundred | - | KHz | R = 16.5 KΩ | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Transmission delay time | tPLZ | - | - | three hundred | ns | CLK → DIO CL = 15pF, RL = 10K Ω |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| tPZL | - | - | one hundred | ns | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| rise time | TTZH 1 | - | - | two | μs | CL = 300p F | SEG1～SEG12 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| fall time | TTHZ | - | - | one hundred and twenty | μs | CL = 300pF，SEGN， GRIDN | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Maximum clock frequency | Fmax | - | - | one | MHz | Duty cycle 50% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Input capacitor | CI | - | - | fifteen | pF | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
8.5. Timing Characteristics (VDD=4.5~5.5 V)
| parameter | symbol | minimum | typical | maximum | unit | test conditions | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Clock pulse width | PWCLK | four hundred | - | - | ns | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Select pulse width | PWSTB | one | - | - | μs | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Data establishment time | tSETUP | one hundred | - | - | ns | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Data retention time | tHOLD | one hundred | - | - | ns | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| CLK → STB time | tCLK STB | one | - | - | μs | CLK↑ → STB↑ | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| waiting time | tWAIT | one | - | - | μs | CLK↑ → CLK↓ | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
8.6. Time series waveform diagram:
▲ Working voltage3.0V~5.5V (typical 5V)
▲ SEG pulling current: 25mA (typical value, Vo=VDD-2V）
▲ Grid current injection140mA (typical value, Vo=0.3V）
▲ Working temperature：-40℃ ~ +85℃
▲ Maximum clock frequency：1MHz
▲ Dynamic current loss<5mA (no load)
9、 Package size
▲SOP24：15.34mm × 7.52mm
▲QSOP24：8.63mm × 3.90mm (more compact, suitable for space sensitive designs)
10、 Summary
CXLE88148N is a practical and simple interface LED driver and keyboard scanning integrated chip, especially suitable for multi digit digital display and key control needs in home appliances, industrial control and other fields. Its 8× 8 display capabilities, 4× The keyboard scanning of 2, flexible brightness adjustment, and good anti-interference performance make it an ideal choice for economical and highly reliable display driver solutions.
If you need the latest data manual or technical support, it is recommended to contact the official or authorized agent to obtain updated information.
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 |
