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CXLC8963E LCD driver deep analysis: integrated watchdog, low power design and application guideHrQ嘉泰姆

In the embedded display system, LCD driver is an indispensable core component, and its performance directly affects the display effect, system power consumption and overall reliability. As a memory-based multi-function LCD driver, CXLC8963E not only has flexible software configuration capability, but also integrates time base generator and watchdog timer (WDT), it is suitable for applications that require strict power consumption and system stability. This article will comprehensively introduce the technical characteristics, electrical parameters, system structure and practical application guide of CXLC8963E, helping engineers to realize efficient and reliable display system design.HrQ嘉泰姆

I. CXLC8963E overview and core functions

CXLC8963E is a highly integrated LCD driver chip, built-in 32 × 4-bit display RAM, supports 24 display points (6 × 4 configuration), suitable for a variety of small and medium size LCD panels. Its operating voltage range is 2.4V to 5.2V, built-in 256kHz RC oscillator, and users can also select an external clock source. The biggest highlight of the chip is the integration of time base generator and watchdog timer, which effectively improves the anti-interference and self-recovery capability of the system.HrQ嘉泰姆

The main features include:HrQ嘉泰姆

•  Low power consumption design: supports power saving mode, with standby current as low as 0.1 μA(3V);HrQ嘉泰姆

•  Three-wire serial interface: only/CS,/WR, and DATA three lines are required to complete communication;HrQ嘉泰姆

•  Built-in watchdog and time base: Provides 8 clock source options to enhance system stability;HrQ嘉泰姆

•  Flexible Display configuration: supports 1/2 or 1/3 bias and 2/3/4 common terminal configuration;HrQ嘉泰姆

•  Compact package: SOP16 package is suitable for space-limited design;HrQ嘉泰姆

•  Software configurable: sets the bias, clock source, and timer behaviors in the command mode.HrQ嘉泰姆

II. Pin connections and electrical characteristics

CXLC8963E is packaged with SOP16, and the pin connections is clear for easy layout:HrQ嘉泰姆

In terms of electrical parameters, the CXLC8963E of work current under the conditions of 3V and 5V are 150μA and 300μa (typical values) respectively. Its input high/low level threshold and driving capability both conform to the general microcontroller interface standard and support serial communication frequency up to 500kHz.HrQ嘉泰姆

2.2. Electrical characteristicsHrQ嘉泰姆

2.2.1) DC electrical parametersHrQ嘉泰姆
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2.2.2)AC electrical characteristics:HrQ嘉泰姆
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III. System structure and memory mapping

CXLC8963E 32 × 4-bit static RAM is integrated internally, and data is directly mapped to LCD segment output. The RAM address is 6 bits (A0 ~ A5) and the data bit width is 4 bits (D0 ~ D3). It supports three access modes: READ, WRITE, and READ-MODIFY-WRITE, it is convenient for main controller to efficiently manage the display content.HrQ嘉泰姆

The system clock is provided by an on-chip RC oscillator or an external clock source. The SYS DIS command can turn off the bias between the system clock and LCD to realize ultra-low power standby. After power-on, the chip is in the SYS DIS state by default. Main controller must send an initialization command to start the system.HrQ嘉泰姆

3.1. Display memory (RAM)HrQ嘉泰姆
Static display memory (RAM) stores the displayed data in 32x 4 bits. The data of RAM is directly mapped to the LCD driver, which can be usedHrQ嘉泰姆
READ, WRITE, and READ-MODIFY-WRITE commands are accessed.HrQ嘉泰姆

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3.2. System oscillatorHrQ嘉泰姆
CXLC8963E system clock is used to generate time base/watchdog timer (WDT) clock frequency and LCD drive clock. On-Chip RC oscillatorHrQ嘉泰姆
(256kHz). Run the SYS DIS command to stop the system clock and LCD bias generator. When the system clock stops working, the LCD will displayHrQ嘉泰姆
If the display is blank, the time base/watchdog timer function will also become invalid.HrQ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,HrQ嘉泰姆
SYS DIS is the power saving command. However, when the system clock is an external clock, the SYS DIS command cannot be used to turn off the system clock and reduce the system power consumption.HrQ嘉泰姆
When the system starts to power up, CXLC8963E is in the SYS DIS state.HrQ嘉泰姆
3.3.LCD driverHrQ嘉泰姆
CXLC8963E is a 24(6x 4) point LCD driver, which can be configured by software to 1/2 or 1/3 LCD driver bias and 2, 3 or 4HrQ嘉泰姆
Public Ports, which makes CXLC8963E suitable for various LCD applications. LCD drive clock is generated by system clock frequency division, LCD driveHrQ嘉泰姆
The frequency value of the clock remains 256Hz. For more information about LCD driver commands, see the following table.HrQ嘉泰姆

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Bold 100 is "100", indicating the command mode type. If continuous commands are executed, the mode type code of other commands except the first commandHrQ嘉泰姆
Will be ignored. The LCD OFF command disables the LCD bias generator, thus turning OFF the LCD display; The LCD ON command makes the LCD bias generator effective,HrQ嘉泰姆
Thus, the LCD display is turned on. BIAS & COM is LCD module related commands, which can make CXLC8963E compatible with most LCD modules.HrQ嘉泰姆

3.4. Command formatHrQ嘉泰姆
CXLC8963E can be set by software. Commands in both modes can be configured to CXLC8963E and transmit the data displayed by the LCD. CXLC8963E matchingHrQ嘉泰姆
The setting mode 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 configuration.HrQ嘉泰姆
SET commands, a timer/WDT setting command and an operation command. The data mode includes WRITE operations. The following table shows the data and command mode types.HrQ嘉泰姆
The code table.HrQ嘉泰姆

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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 notHrQ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 returnsHrQ嘉泰姆
"0", the new operation mode type code should be run first.HrQ嘉泰姆
3.5. InterfaceHrQ嘉泰姆
CXLC8963E only three pins are used for interfaces. Pin/CS is used to initialize the serial interface circuit and end the communication between main controller and CXLC8963E.HrQ嘉泰姆
News. When pin/CS is set to 1, the data and commands between main controller and CXLC8963E are invalid and initialized. Generate command mode or mode conversionHrQ嘉泰姆
Before that, you must initialize the serial interface of CXLC8963E with a high-level pulse. PIN DATA is a serial DATA input pin that writes DATA and writes commands.HrQ嘉泰姆
Use PIN DATA. Pin/WR is the write clock input pin. When the/WR signal rises, the DATA, address, and command on PIN DATA are written.HrQ嘉泰姆
Enter CXLC8963E.HrQ嘉泰姆

3.6. Timing diagramHrQ嘉泰姆
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IV. Command mode and communication interface

4.1.CXLC8963E supports two operation modes:HrQ嘉泰姆

•  Data mode(Type code 101): used to write display data;HrQ嘉泰姆

•  Command mode(Type code 100): used for system configuration.HrQ嘉泰姆

4.2. The main commands include:HrQ嘉泰姆

Command	Code	Description
SYS DIS	100 00000000X	Turn off system oscillator and LCD bias
LCD ON/OFF	100 00000011X/10X	Turn on/off LCD display
BIAS&COM	100 0010abXcX	Set bias voltage and number of common terminals
CLR WDT	100 0000111XX	Clear watchdog status

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All bold numbers, namely 101 and 100, are the mode command codes. 100 is the command mode type code. If you run a continuous command, except the first oneHrQ嘉泰姆
Command, the mode type code of other commands will be ignored. We recommend that you initialize main controller with CXLC8963E after power-on reset, because if power-on restartsHrQ嘉泰姆
Bit failure, CXLC8963E will not work properly.

4.3. Simple communication sequence:HrQ嘉泰姆

•  Pull down/CS to start transmission;HrQ嘉泰姆

•  Lock DATA on the rising edge of/WR;HrQ嘉泰姆

•  When writing continuously, only the first command must contain the pattern code.HrQ嘉泰姆

4.4. Pin drive waveform:HrQ嘉泰姆
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V. Watchdog and time base functions

CXLC8963E built-in watchdog timer (WDT) and time base generator are the highlights that distinguish them from most similar products. The watchdog can automatically reset the system when the program is running, while the time base generator can provide timing interrupt signals, which is suitable for scenarios where the display needs to be refreshed regularly or periodic tasks are executed. You can use the CLR WDT command to periodically clear the watchdog to avoid false triggering.HrQ嘉泰姆

VI. Application scenarios and design suggestions

6.1.CXLC8963E is widely used in the following fields:HrQ嘉泰姆

•  Portable medical equipment (such as sphygmomanometer and blood glucose meter);HrQ嘉泰姆

•  Control panel of household appliances;HrQ嘉泰姆

•  Industrial instrument and HMI interface;HrQ嘉泰姆

•  Smart card reader and security protection equipment.HrQ嘉泰姆

6.2. Pay attention to the design:HrQ嘉泰姆

•  VLCD voltage must be lower than VDD, and the contrast can be adjusted by VR resistor (typical value 15kΩ);HrQ嘉泰姆

•  Strengthen ESD protection in dry environment to avoid chip damage;HrQ嘉泰姆

•  The configuration must be initialized after power-ON, especially the LCD ON and SYS EN commands;HrQ嘉泰姆

•  Reasonable use of watchdog function to improve system robustness.HrQ嘉泰姆

6.3. Application diagram:HrQ嘉泰姆
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VII. Packaging and mechanical dimensions

CXLC8963E adopts SOP16 package, compact size (total length mm, colloid width mm), suitable for high-density PCB layout. The package meets the industrial temperature standard (-40℃ to 85℃) and has good weldability and heat dissipation performance.HrQ嘉泰姆

VIII. Conclusion

CXLC8963E is an ideal choice for small and medium-scale LCD display systems due to its high integration, low power consumption, built-in watchdog and flexible configuration capabilities. Whether used in consumer electronics or industrial control equipment, its stable performance and rich functions can significantly improve the competitiveness and reliability of products.HrQ嘉泰姆

For CXLC8963E samples, technical data, or design support, please visitJTM-IC official website, we provide you with complete product solutions and professional technical services.HrQ嘉泰姆

Nine,Relevant chip selection guideMore similar products.....HrQ嘉泰姆

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