Page 37

EETE JULAUG 2013

Development Tools PICDEM™ LCD 2 Demo Board (DM163030) ■ I llustrates and supports the main features of Microchip’s 28-, 40-, 64- and 80-pin LCD PIC microcontrollers ■ LCD glass with icons, numbers, alphanumeric and starburst display ■ Separate Processor Plug-in Modules (PIMs) are available to evaluate all of the LCD products ■ Booster capability for contrast control and dimming LCD Explorer Development Board (DM240314) ■ Supports PIC24 & PIC18 LCD PIC MCUs with XLP technology ■ Current measurement terminals, mTouch sensing solutions & expansion connector ■ Eight common LCD glass ■ Support 1/3 biasing ■ CTMU switch to showcase touch sensing ■ Four switches implemented for software demonstration ■ Power the board using 9V power supply, USB connector, two AAA batteries or Connector for VBAT current measurement PIC18F97J94 PIM Demo Board (MA180034) ■ Features 100-pin PIC18F97J94 for evaluation of all 100-, 80- and 64-pin PIC18F97J94 LCD/USB/General Purpose MCUs ■ Plugs into LCD Explorer Board (DM240314) for additional functionality ■ Contains code examples 8-bit PIC® Microcontroller Solutions 9 PIC Microcontrollers with LCD Segmented Displays Segmented displays are used in a wide variety of applications, ranging from meters to portable medical devices to thermostats to exercise equipment. PIC MCUs with integrated LCD drivers can directly drive segmented displays with letters, numbers, characters and icons. The main features of Microchip’s LCD portfolio include: ■ Flexible LCD segments • 28 pins: up to 72 segments • 44 pins: up to 116 segments • 64 pins: up to 184 segments • 80 pins: up to 192 segments • 100 pins: up to 480 segments ■ Variable clock inputs ■ Integrated voltage bias generation ■ Direct drive for both 3V and 5V powered displays ■ Software contrast control for boosting or dimming for different temperature or lighting conditions ■ Drive LCD while conserving power in Sleep mode ■ Integrated real time clock and calendar for displaying time and date information ■ mTouch capacitive touch sensing capability ■ Crystal-free USB 2.0 options Direct Drive for Segmented Displays The LCD PIC microcontrollers support direct LCD panel drive capability with no external components needed, lowering total system cost. They have integrated voltage bias generation which allows the MCU to generate the different voltage levels that are required to drive the LCD segment pins and provide good contrast for the display. The LCD MCUs support a range of fixed and variable bias options as well as variable clock inputs that enable the flexibility to work with many different glass vendors. Contrast Control Software contrast control is a key feature using firmware to either boost or dim the contrast of the display. Boost the contrast up to VDD or beyond if you are using one of the MCUs with an integrated charge pump. Software contrast control allows the designer to vary the contrast on the LCD to account for different operating conditions such as temperature, lighting, and humidity. Also, software contrast control can be invaluable for portable applications. As the battery level starts to drop, the firmware can apply a boost to the contrast helping extend the battery life while still seeing a crisp image on the display. Featured LCD Product Families Device Family Pins Flash (KB) Max Segments Voltage (V) Additional Features PIC16LF1907 28–40 3.5–14 116 1.8–3.6 10-bit ADC, EUSART PIC16(L)F1947 28–64 7–28 184 1.8–5.5 10-bit ADC, EEPROM, I2C™, SPI, Comparators PIC18F87K90 64–80 32–128 192 1.8–5.5 10-bit ADC, EEPROM, I2C, SPI, RTCC, Comparators, ECCP PIC18F97J94 64–100 32–128 480 2–3.6 Crystal-free USB, VBAT, 12-bit ADC, ECCP, UART, I2C, SPI, Comparators www.microchip.com/lcd


EETE JULAUG 2013
To see the actual publication please follow the link above