Datasheet

7
Microchip Human Interface Solutions
www.microchip.com/lcd
Display Controller Solutions: Segmented LCD
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.
Development Tools for Segmented LCD
LCD Explorer Development Board (DM240314)
■ Supports Microchip’s 100-pin
microcontrollers with × 8 common
segment LCD drivers
■ Provides an ideal platform to
evaluate a MCU with a × 8 Common
LCD Driver on a 38 segment × 8
common LCD display
■ PICtail™ Plus connections enable evaluation of selected
MCUs in a complex system by adding PICtail Plus
daughter boards
PICDEM™ LCD 2 Demo Board (DM163030)
■ Illustrates 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
■ Demonstrates booster capability for contrast control
and dimming
■ Separate Processor Plug-in Modules (PIMs) are
available to evaluate all of the LCD products
• PIC18F87J90 PIM (MA180025)
• PIC18F87K90 PIM (MA180027)
• PIC16F1947 PIM (MA160016)
• LCD PIM Pack (PIC16) (MA180019)
Application Notes for LCD Displays
■ Low Power Techniques for LCD Applications, TB1098
■ Implementing an LCD Using the PIC16F1947
Microcontroller, AN1354
Display Solutions for Segmented LCD
Segmented displays are used in a wide variety of
applications, ranging from meters to portable medical
devices to thermostats to exercise equipment. PIC
microcontrollers 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 60 segments
• 44 pins, up to 116 segments
• 64 pins, up to 240 segments
• 80 pins, up to 368 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
PIC18FXXK9X
Max 192 Segments
mTouch
Cap Sensing
Peripherals,
RTCC
64-80 pins
32-128 KB Flash
1.8-5.5V
mTouch
Cap Sensing
Peripherals,
RTCC
PIC18FXXJ9X
Max 192 Segments
64-80 pins
16-128 KB Flash
2.0-3.6V
mTouch
Cap Sensing
Peripherals
28-64 pins
7-28 KB Flash
1.8-5.5V
PIC16F19XX
Max 192 Segments
PIC24FJXXXGAXX
Max 480 Segments
mTouch™
Cap Sensing
Peripherals,
RTCC
64-100 pins
64-128 KB Flash
2.0-3.6V
Size of Displays
Performance
mTouch
Cap Sensing
Peripherals
28-40 pins
3.5-14 KB Flash
1.8-3.6V
PIC16LF190X
Max 116 Segments