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Block Diagram - LCD Drive

Design Considerations
A liquid crystal display (LCD) is a thin, flat electronic visual display that uses the light modulating properties of liquid crystals (LCs). They are used in a wide range of applications including: computer monitors, television, instrument panels, consumer electronics, portable medical devices, signage, etc. LCDs are common in portable devices since they are compact, lightweight, portable, low cost, and energy efficient. They are available in a wide range of screen sizes and are used in various applications to enhance the user interface and functionality.

The PSoC Segment LCD (LCD_Seg) component can directly drive a variety of LCD glass at different voltage levels with multiplex ratios up to 16x. PSoC provides much more integration than competitive LCD Drive solutions from fixed microcontrollers. PSoC can support up to 16 Commons requiring fewer pins for LCD, and can drive up to 736 LCD Segments with no Helper Chip enabling complex, large displays. PSoC supports LCD Drive on every GPIO making the hardware design of the LCD Display easier with PSoC. PSoC's internal bias generation eliminates the need for any external hardware and allows for software based contrast adjustment. Using the high efficiency integrated Boost Converter, the glass bias may be at a higher voltage than the PSoC supply voltage. This allows increased display flexibility in portable applications.

The PSoC Creator Software IDE revolutionizes the software design required for LCD Drive design. With an easy to use pin selection table and automated contrast control, PSoC Creator eliminates hours of code development required with traditional, fixed microcontrollers.

Application Notes

AN52927 - PSoC® 3 and PSoC 5LP - Segment LCD Direct Drive

AN56384 - PSoC® 1 Segment LCD Direct Drive
AN56384 explains implementation of software based multiplexed segment lcd driver in psoc® 1 device.

Development Kits/Boards

Avnet Spartan-6 LX16 PSoC 3 Kit
Buy "Avnet Spartan-6(TM) LX16 Kit" from Avnet Today

CY8CKIT-001 PSoC® Development Kit

CY8CKIT-006 PSoC® 3 LCD Segment Drive Evaluation Kit (OBSOLETE)

CY8CKIT-029 PSoC® LCD Segment Drive Expansion Board Kit
The CY8CKIT-029 PSoC® LCD Segment Drive Expansion Board Kit allows you to evaluate PSoC's LCD drive capability using LCD segment component in Cypress's PSoC Creator™.


Enables Drive of Up to 736 LCD Segments with No Additional Driver or MCU;
Drag-and-Drop Design with LCD Component in PSoC Creator™ IDE

SAN JOSE, Calif., November 19, 2009 – Cypress Semiconductor Corp. (NASDAQ: CY) today introduced two evaluation kits showing the ease-of-use, fast development time and flexibility of its new PSoC® 3 architecture for LCD segment drive applications. The new CY8CKIT-006 PSoC 3 LCD Segment Drive Evaluation Kit and the CY8CKIT-029 PSoC LCD Segment Drive Expansion Board Kit demonstrate how a single PSoC 3 device can drive up to 736 LCD segments, more than any microcontroller-based solution. With the kits, designers can leverage the drag-and-drop LCD Drive component in the PSoC Creator™ Integrated Development Environment (IDE) to quickly and easily design products with an LCD screen for the consumer electronics, handheld, medical, industrial, white goods, automotive and other markets.

Currently, design of LCD segments requires hundreds of lines of complex code to define a screen’s segment intersections. The set-up wizard in the PSoC Creator IDE now enables designers to visually map these intersections in an intuitive drag-and-drop style. The tool then provides the power to manually configure LCD pin locations or automatically routes all on-chip signals and can even direct I/O to the optimum pins if desired. The PSoC Creator IDE also provides all of the APIs required to write to the LCD screen instead of requiring designers to create them. The complete PSoC 3 platform significantly cuts development time for LCD applications.

The new PSoC 3 architecture delivers unparalleled flexibility for LCD Drive applications with up to 16 common pins, versus only 4 or 8 for microcontroller-based solutions. This reduces the number of I/Os required for an LCD screen, freeing up pins for more peripheral integration and providing the option for smaller packages. The architecture allows any GPIO to be set as an LCD pin for simplified routing, requiring fewer PCB layers. PSoC 3 devices offer software contrast control, eliminating the need for an external potentiometer. The devices integrate internal voltage generation requiring no external resistors or capacitors, and can drive an LCD screen with a battery voltage as low as 0.5V, enabling operation from a single solar cell. More information on each kit is available at and

“The combination of our revolutionary new PSoC 3 architecture and PSoC Creator software offers the easiest-to-use and most flexible LCD drive system on the market,” said Matt Branda, director of marketing for PSoC products at Cypress. “The new development kits show designers how to easily implement LCD segment displays, with no external components needed, enabling fast time to market via the PSoC Creator software set-up wizard.”

PSoC 3 and PSoC 5 devices extend the world’s only programmable analog and digital embedded design platform, delivering unmatched time-to-market, integration, and flexibility across 8-, 16-, and 32-bit applications. The platform is powered by the revolutionary PSoC Creator IDE, which introduces a unique schematic-based design methodology along with fully tested, pre-packaged analog and digital peripherals easily customizable through user-intuitive wizards and APIs to meet specific design requirements.

The PSoC 3 LCD Segment Drive Evaluation Kit contains:
• PSoC 3 LCD Segment Drive Evaluation Board
• 9V Battery
• 12V Wall Power Supply
• MiniProg3 Programmer / Debugger
• USB Cable (to connect MiniProg3 to the PC)
• Kit Stand
• Quick Start Guide
• Kit CD, which includes: PSoC Creator, PSoC Programmer, Projects and Documentation.

The PSoC LCD Segment Drive Expansion Board Kit includes an expansion board with an LCD screen that plugs into the development board of the PSoC Development Kit (CY8CKIT-001) for simplified testing of LCD design functionality. The kit features battery meter and stopwatch example projects on a 7- and 14-segment multi-function display.

Availability and Photo
The CY8CKIT-006 PSoC 3 LCD Segment Drive Evaluation Kit is priced at US $149 and the CY8CKIT-029 PSoC LCD Segment Drive Expansion Board Kit is US$59. Both kits are available on the Cypress eShop at or through authorized distributors. A high-resolution photo of each kit is available at

About PSoC 3 and PSoC 5
The new PSoC 3 and PSoC 5 architectures include high-precision programmable analog capability (up to 20-bit resolution for an Analog to Digital Converter) and expanded programmable digital resources integrated with powerful, industry-standard MCU cores and ample memory and communications peripherals. The PSoC 3 devices are based on a new, high-performance 8-bit 8051 processor, while the PSoC 5 devices include a powerful 32-bit ARM Cortex™-M3 processor. The new products provide designers with a seamless, programmable design platform, enabling easy migration from 8 to 32 bits. The robust features of these new solutions dramatically expand the applications and markets that PSoC can address, including automotive, portable medical, industrial and many more. More information about PSoC products is available at and free online training is at

About Cypress
Cypress delivers high-performance, mixed-signal, programmable solutions that provide customers with rapid time-to-market and exceptional system value. Cypress offerings include the flagship PSoC® programmable system-on-chip families and derivatives such as PowerPSoC® solutions for high-voltage and LED lighting applications, CapSense® touch sensing and TrueTouch™ solutions for touchscreens. Cypress is the world leader in USB controllers, including the high-performance West Bridge® solution that enhances connectivity and performance in multimedia handsets. Cypress is also a leader in high-performance memories and programmable timing devices. Cypress serves numerous markets including consumer, mobile handsets, computation, data communications, automotive, industrial and military. Cypress trades on the NASDAQ Global Select Market under the ticker symbol CY. Visit Cypress online at

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Cypress, the Cypress logo, PSoC, PowerPSoC, CapSense and West Bridge are registered trademarks and PSoC Creator and TrueTouch are trademarks of Cypress Semiconductor Corp. All other trademarks are property of their owners.

Training On-Demand

Software and Drivers

PSoC Creator
PSoC Creator is a state-of-the-art software development IDE combined with a revolutionary graphical design editor to form a uniquely powerful hardware/software co-design environment.

PSoC Designer
PSoC Designer is the revolutionary Integrated Design Environment (IDE) that you can use to customize PSoC to meet your specific application requirements. PSoC Designer software accelerates system bring-up and time-to-market.

Spec No: None; Sunset Owner: HMI; Secondary Owner: YMT; Sunset Date: 06/15/20