• [ CXLC8963GL ]"

Ordering

CXLC8963GL LCD driver comprehensive analysis: 128-point driver, watchdog and four-wire interface application guide01L嘉泰姆

In today's embedded display systems, the demand for large-size and high-density LCD panels is increasing day by day. At the same time, system stability and power consumption control have also become key design considerations. As a high-performance memory image LCD driver, CXLC8963GL not only supports 128-point (32 × 4) display, but also integrates time base generator, watchdog timer and four-wire serial interface, provides a complete solution for complex display applications. This paper will deeply analyze the technical characteristics, system architecture, electrical parameters and practical applications of CXLC8963GL, providing engineers with comprehensive design references.01L嘉泰姆

I. CXLC8963GL core features and product positioning

CXLC8963GL is a highly integrated driver chip designed for large-scale LCD display. It has a built-in 32 × 4-bit display RAM and directly supports 128-point display output. Its operating voltage range is 2.4V to 5.2V, which is compatible with most embedded system power supply designs. The chip has built-in 256kHz RC oscillator, which supports software-configured bias voltage (1/2 or 1/3) and duty cycle (1/2, 1/3 or 1/4), applicable to various LCD panel types.01L嘉泰姆

Main Technical Highlights:01L嘉泰姆

•  Large Capacity display driver: supports up to 128 points (32 × 4)LCD display;01L嘉泰姆

•  Four-wire serial interface: It has four lines of/CS,/WR,/RD, and DATA, and supports high-speed DATA transmission;01L嘉泰姆

•  Integrate watchdog and time base: Provides 8 programmable clock sources to enhance system reliability;01L嘉泰姆

•  Multiple data access modes: Supports READ, WRITE, and READ-MODIFY-WRITE operations;01L嘉泰姆

•  Low power consumption design: The standby current is as low as 0.1 μA (under the condition of 3V);01L嘉泰姆

•  Industrial Packaging: QFP44 package, suitable for high-density PCB layout.01L嘉泰姆

II. Pin connections and electrical characteristics

CXLC8963GL adopts QFP44 package, and the pin layout is optimized to display output and control signals:01L嘉泰姆

2.2. Highlights of electrical parameters:01L嘉泰姆

•  Work current: 150 μA at 3V (typical), 300 μA at 5V;01L嘉泰姆

•  Input level: compatible with 3V/5V logic system;01L嘉泰姆

•  Driving capability: the output current of the segment reaches 120μa, and the common terminal reaches 150μa;01L嘉泰姆

•  Communication Rate: supports up to 500kHz serial clocks.01L嘉泰姆

2.3. DC electrical parameters:01L嘉泰姆
01L嘉泰姆
01L嘉泰姆
2.4. AC electrical characteristics:01L嘉泰姆
01L嘉泰姆

III. System architecture and memory mapping

3.2. System oscillator01L嘉泰姆
CXLC8963GL system clock is used to generate time base/watchdog timer (WDT) clock frequency and LCD drive clock. The on-chip RC oscillator (256kHz) generates a clock source. The system oscillator configuration diagram is shown in the following figure. Run the SYS DIS command to stop the system clock and LCD bias generator. When the system clock stops working, the LCD will display blank and the time base/watchdog timer function will also fail.01L嘉泰姆
01L嘉泰姆
The LCD OFF command is used to turn OFF the LCD bias generator. When the LCD bias generator is turned OFF, the SYS DIS command can be used to reduce the system power consumption. At this time, SYS DIS is the power saving command. When the system starts to power up, CXLC8963GL is in the SYS DIS state.01L嘉泰姆
 

CXLC8963GL adopts an efficient 32 × 4-bit static RAM architecture, and data is directly mapped to LCD segment output. The RAM address is 6 bits (A0 to A5) and supports three access modes:01L嘉泰姆

•  READ mode(Code 110): Read display data;01L嘉泰姆
01L嘉泰姆

•  WRITE mode(Code 101): write display data;01L嘉泰姆
01L嘉泰姆

•  READ-MODIFY-WRITE mode(Code 101): Read before write, applicable to bit operations.01L嘉泰姆
01L嘉泰姆
•  Command mode (command code 100)01L嘉泰姆
01L嘉泰姆
•  Command overview01L嘉泰姆
01L嘉泰姆
       All bold numbers, namely 110,101, and 100, are the mode command codes. 100 is the command mode type code. If you run continuous commands,01L嘉泰姆
For the first command, the mode type code of other commands will be ignored. Time Base/WDT clock frequency source is generated by on-chip 256kHz RC oscillator with frequency01L嘉泰姆
The calculation is as described above. We recommend that you initialize main controller with CXLC8963GL after power-on reset, because if power-on reset fails, CXLC896301L嘉泰姆
GL cannot work properly.01L嘉泰姆
•  Pin drive waveform:01L嘉泰姆
01L嘉泰姆

The system clock is provided by the on-chip 256kHz RC oscillator, and the LCD drive clock (fixed 256Hz) and Time Base/WDT clock are generated by frequency division. After power-on, the chip is in the SYS DIS state by default. You must initialize the configuration through main controller.01L嘉泰姆

4. Time base and watchdog timer functions

The CXLC8963GL time base generator and watchdog timer are important features different from ordinary LCD driver chips:01L嘉泰姆

4.1. Time base generator:01L嘉泰姆

•  8-bit incremental counter, which can generate 1Hz to 128Hz time base signal;01L嘉泰姆

•  The output can be connected to main controller through the/IRQ pin for scheduled interrupts.01L嘉泰姆
Time base generator is an 8-state value-added spike counter, which can generate accurate time base. WDT consists of a time base generator and a 2-state value-added spike meter.01L嘉泰姆
Consists of a counter, which can generate interrupts when main controller or other subsystems are in an abnormal state. An on-chip WDT overflow flag is generated when WDT overflows,01L嘉泰姆
You can use a command option to output the time base generator and WDT overflow flag to the/IRQ pin. There are 8 clock frequencies of time base generator and WDT,01L嘉泰姆
fWDT = 32kHz/2n the n value here is 0~7, which is determined by the command item: 32kHz in the equation is the system frequency, which is generated by the on-chip oscillator (256kHz).01L嘉泰姆
01L嘉泰姆
If the system source frequency is the on-chip oscillator frequency (256kHz), it is divided into 32kHz by the third-order pre-frequency divider. Time base generator and WDT01L嘉泰姆
The same 8-order counter, so be careful when using command items related to time base generator and WDT. For example, when you run the WDT DIS command01L嘉泰姆
If the base generator fails, executing the WDT EN command not only makes the time base generator effective, but also makes the WDT overflow flag output effective (WDT overflow flag output01L嘉泰姆
Connect to the/IRQ pin. After the TIMER EN command is executed, WDT is not connected to/IRQ, and the output of the time base generator is connected to the/IRQ pin. CLRWDT01L嘉泰姆
The command is used to clear the WDT overflow flag. The value of the time base generator can be cleared by the CLR WDT or CLR TIMER command.01L嘉泰姆
The command should be executed before the corresponding WDT EN or TIMER EN command. Before the/IRQ EN command is executed, the CLR WDT or CLR TIMER should be executed first.01L嘉泰姆
Command. You must run the CLR TIMER before switching from WDT mode to base mode. When WDT overflows, the/IRQ pin will remain low and straight.01L嘉泰姆
Until the CLR WDT or/IRQ DIS command is executed. When the/IRQ output fails, the/IRQ pin is in the high resistance state. Run/IRQ EN OR/IRQ DIS01L嘉泰姆
The command makes the/IRQ output valid or invalid. The/IRQ EN command outputs the time base generator or WDT overflow flag to the/IRQ pin. Time base generator and01L嘉泰姆
For more information about WDT configurations, see figure. When an on-chip oscillator is used, the oscillator can be turned on or off by relevant system commands. After the oscillator is turned off,01L嘉泰姆
To reduce system power consumption. In power saving mode, the time base/WDT will fail.01L嘉泰姆
CXLC8963GL keep working when the system power is off. After the system is powered on, the/IRQ output will also be invalid.01L嘉泰姆

4.2. Watchdog timer:01L嘉泰姆

•  2-bit counter based on time base for detecting system exceptions;01L嘉泰姆

•  Interrupt or esysreset signals can be generated when overflow occurs;01L嘉泰姆

•  Supports clearing the status of the CLR WDT command.01L嘉泰姆

4.3. Configure commands:01L嘉泰姆

•  TIMER EN/WDT EN: enables time base or watchdog output;01L嘉泰姆

•  CLR TIMER/CLR WDT: clears the counter status;01L嘉泰姆

•  /IRQ EN: enable interrupt output.01L嘉泰姆

V. LCD driver configuration and command system

CXLC8963GL supports flexible LCD driver configurations:01L嘉泰姆

5.1. Bias voltage and common terminal setting:01L嘉泰姆

BIAS & COM command: 1000010abXcX
c = 0:1/2 bias; c = 1:1/3 bias
AB = 00:2 public end; AB = 01:3 public end; AB = 10:4 public end

5.2. Main display commands:01L嘉泰姆

•  LCD ON/OFF: turn ON/OFF display output;01L嘉泰姆

•  SYS EN/DIS: control system oscillator;01L嘉泰姆

•  BIAS1/2 and BIAS1/3: Set the bias mode.01L嘉泰姆

CXLC8963GL can be set by software. Commands in both modes can be configured to CXLC8963GL and transmit the data displayed by the LCD. CXLC8963GL01L嘉泰姆
The configuration mode of is called command mode, and the type code is 100. The command mode includes a system configuration command, a system frequency selection command, and an LCD.01L嘉泰姆
Configuration command, a sound frequency selection command, a timer/WDT setting command and an operation command. Data modes include READ and WRITE.01L嘉泰姆
And READ-MODIFY-WRITE operations. The following table lists the data and command mode types.01L嘉泰姆

01L嘉泰姆

Mode commands should be run before data or commands are transferred. If continuous commands are executed, the command mode code is 100, which will be ignored. When the system is not01L嘉泰姆
In continuous command mode or discontinuous address data mode, pin/CS should be set to "1" and the previous operation mode will be reset. When pin/CS returns01L嘉泰姆
When you return to 0, the new operation mode type code should be run first.01L嘉泰姆

5.3. Communication protocol:01L嘉泰姆

•  Four-wire interface supports full duplex data transmission;01L嘉泰姆

•  The mode code (100/101/110) identifies the operation type;01L嘉泰姆

•  Mode code is required for only the first command during continuous transmission.01L嘉泰姆

CXLC8963GL only four pins are used for interfaces. Pin/CS is used to initialize the serial interface circuit and end between main controller and CXLC8963GL01L嘉泰姆
Communication. When pin/CS is set to 1, the data and commands between main controller and CXLC8963GL are invalid and initialized. In command mode or module generation01L嘉泰姆
Before conversion, a high-level pulse must be used to initialize the serial interface of CXLC8963GL. PIN DATA is a serial DATA input/output pin, read/01L嘉泰姆
Write DATA and write commands through PIN DATA. Pin/RD is the read clock input pin. When the/RD signal is failling edge, the DATA output pin DATA01L嘉泰姆
On, between the rising edge of the/RD signal and the next failling edge, main controller should read the corresponding data. Pin/WR is the write clock input pin, in/WR01L嘉泰姆
DATA, addresses, and commands on PIN DATA are written to CXLC8963GL when the signal rises. Optional pin/IRQ can be used as the main controller and01L嘉泰姆
Interface between CXLC8963GL,/IRQ can be set as timer output or WDT overflow flag output by software. Main controller and CXLC8963GL01L嘉泰姆
After/IRQ is connected, the time base or WDT function can be implemented.01L嘉泰姆

VI. Application scenarios and Design Guidelines

6.1. CXLC8963GL applies to the following high-end display applications:01L嘉泰姆

•  Industrial control panel: Display of HMI interface and dashboard;01L嘉泰姆

•  Medical equipment: Monitor and diagnostic equipment display;01L嘉泰姆

•  Smart Home: central control panel, security system;01L嘉泰姆

•  Office equipment: the status of the copier and printer is displayed.01L嘉泰姆

6.2. Design attention:01L嘉泰姆

•  VLCD voltage must be lower than VDD, and VDD = 5V when typical VLCD = 4V;01L嘉泰姆

•  Use 15kohm ± 20% resistor to adjust LCD contrast;01L嘉泰姆

•  /IRQ output requires external 10 kOhm pull-up resistor;01L嘉泰姆

•  The initialization sequence must be performed after power-ON, including SYS EN and LCD ON;01L嘉泰姆

•  Strengthen ESD protection measures in dry environment.01L嘉泰姆

VII. Packaging information and mechanical dimensions

CXLC8963GL adopts QFP44 package and has the following features:01L嘉泰姆

•  Package Size: 10mm × 10mm body,0.8mm pitch;01L嘉泰姆

•  Number of pins: 44;01L嘉泰姆

•  Operating temperature:-40℃ to 85℃;01L嘉泰姆

•  Meet industrial reliability standards.01L嘉泰姆

The compact QFP package makes it suitable for space-constrained applications while maintaining good heat dissipation performance.01L嘉泰姆

VIII. Conclusion

CXLC8963GL is an ideal choice for large-scale LCD display systems due to its 128-point drive capability, integrated watchdog timer, flexible four-wire interface and low power consumption. Whether it is industrial control, medical equipment or high-end consumer electronics, its powerful functions and stable performance can meet the most stringent design requirements.01L嘉泰姆

For CXLC8963GL samples, technical documents, or design support, please visitJTM-IC official website, our technical team will provide you with professional product selection suggestions and complete design solutions.01L嘉泰姆

IX. Relevant chip selection guide More similar products.....01L嘉泰姆

◀ Previous:Cxlc8963e LCD Driver Deep Resolution: Integrated Watchdog, Low Power Design and Application Guide | JTM-IC

Back to top

Next▶:Cxlc8964b LCD Driver Deep Analysis: 256-Point Drive, Buzzer and Watchdog Integrated Design | JTM-IC