LCD Driver for Character Displays

Overview

The PCF21219 is a low power CMOS LCD controller and driver, designed to drive a dot matrix LCD display of 2-lines by 16 characters or 1-line by 32 characters with 5 x 8 dot format. All necessary functions for the display are provided in a single chip, including on-chip generation of LCD bias voltages, resulting in a minimum of external components and lower system current consumption. The PCF21219 interfaces to most microcontrollers via a 4-bit or 8-bit bus or via the 2-wire I²C-bus. The chip contains a character generator and displays alphanumeric and kana (Japanese) characters.

The last letter in the type name, for example PCF21219DUGR, characterizes the built-in character set. Various character sets can be manufactured on request. In addition 16 user defined symbols (5 x 8 dot format) are available.

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Features

Single-chip LCD controller and driver
2-line display of up to 16 characters plus 160 icons or 1-line display of up to 32 characters plus 160 icons
5 x 7 character format plus cursor; 5 x 8 for kana (Japanese) and user defined symbols
Reduced current consumption while displaying icons only
On-chip:
- Configurable 4, 3, or 2 times voltage multiplier generating LCD supply voltage, independent of V_DD, programmable by instruction (external supply also possible)
- Temperature compensation of on-chip generated V_LCDOUT: -0.16 %/K to -0.24 %/K (programmable by instruction)
- Generation of intermediate LCD bias voltages
- Oscillator requires no external components (external clock also possible)
Display Data RAM (DDRAM): 80 characters
Character Generator ROM (CGROM): 240 characters (5 x 8)
Character Generator RAM (CGRAM): 16 characters (5 x 8); 4 characters used to drive 160 icons
4-bit or 8-bit parallel bus and 2-wire I²C-bus interface
Pin compatible with PCF2119
Manufactured in silicon gate CMOS process
18 row and 80 column outputs
Multiplex rates 1:18 (2-line display or 1-line display), 1:9 (for 1-line display of up to 16 characters and 80 icons) and 1:2 (for icon only mode)
Uses common 11 code instruction set (extended)
Logic supply voltage: V_DD1 - V_SS1 = 2.5 V to 5.5 V (chip may be driven with two battery cells)
LCD supply voltage: V_LCDOUT - V_SS2 = 2.5 V to 6.5 V
V_LCD generator supply voltage: V_DD2 - V_SS2 = 2.5 V to 4 V and V_DD3 - V_SS2 = 2.5 V to 4 V
Direct mode to save current consumption for icon mode and multiplex drive mode 1:9 (depending on V_DD2 value and LCD liquid properties)
Very low current consumption
Icon mode is used to save current. When only icons are displayed, a much lower LCD operating voltage can be used and the switching frequency of the LCD outputs is reduced; in most applications it is possible to use V_DD as LCD supply voltage

Target Applications

Telecom equipment
Portable instruments
Point-of-sale terminals

MoreLess

Features

Single-chip LCD controller and driver
2-line display of up to 16 characters plus 160 icons or 1-line display of up to 32 characters plus 160 icons
5 x 7 character format plus cursor; 5 x 8 for kana (Japanese) and user defined symbols
Reduced current consumption while displaying icons only
On-chip:
- Configurable 4, 3, or 2 times voltage multiplier generating LCD supply voltage, independent of V_DD, programmable by instruction (external supply also possible)
- Temperature compensation of on-chip generated V_LCDOUT: -0.16 %/K to -0.24 %/K (programmable by instruction)
- Generation of intermediate LCD bias voltages
- Oscillator requires no external components (external clock also possible)
Display Data RAM (DDRAM): 80 characters
Character Generator ROM (CGROM): 240 characters (5 x 8)
Character Generator RAM (CGRAM): 16 characters (5 x 8); 4 characters used to drive 160 icons
4-bit or 8-bit parallel bus and 2-wire I²C-bus interface
Pin compatible with PCF2119
Manufactured in silicon gate CMOS process
18 row and 80 column outputs
Multiplex rates 1:18 (2-line display or 1-line display), 1:9 (for 1-line display of up to 16 characters and 80 icons) and 1:2 (for icon only mode)
Uses common 11 code instruction set (extended)
Logic supply voltage: V_DD1 - V_SS1 = 2.5 V to 5.5 V (chip may be driven with two battery cells)
LCD supply voltage: V_LCDOUT - V_SS2 = 2.5 V to 6.5 V
V_LCD generator supply voltage: V_DD2 - V_SS2 = 2.5 V to 4 V and V_DD3 - V_SS2 = 2.5 V to 4 V
Direct mode to save current consumption for icon mode and multiplex drive mode 1:9 (depending on V_DD2 value and LCD liquid properties)
Very low current consumption
Icon mode is used to save current. When only icons are displayed, a much lower LCD operating voltage can be used and the switching frequency of the LCD outputs is reduced; in most applications it is possible to use V_DD as LCD supply voltage

Target Applications

Telecom equipment
Portable instruments
Point-of-sale terminals

Data Sheets

Application Notes

PCF21219DUGR: LCD Driver for Character Displays

Overview

Features

Target Applications

Features

Target Applications