General description

The PCF2119x is a low power CMOS¹ 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 ×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 PCF2119x 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.

Features and benefits

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

5×7 character format plus cursor; 5×8 for kana (Japanese) and user defined symbols

Reduced current consumption while displaying icons only

Icon blink function

On-chip:

  ‹Configurable 4, 3, or 2 times voltage multiplier generating LCD supply voltage, independent of VDD, programmable by instruction (external supply also possible)

  ‹Temperature compensation of on-chip generated VLCDOUT: −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 (5×8)

Character Generator RAM (CGRAM): 16 characters (5×8); 4 characters used to drive 160 icons, 8 characters used if icon blink feature is used in application

4-bit or 8-bit parallel bus and 2-wire I2C-bus interface

Manufactured insilicon 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: VDD1−VSS1= 1.5 V to 5.5 V (chip may be driven with two battery cells)

LCD supply voltage: VLCDOUT−VSS2= 2.2 V to 6.5 V

VLCDgenerator supply voltage: VDD2−VSS2= 2.2 V to 4 V and VDD3−VSS2=2.2Vto4V

Direct mode to save current consumption for icon mode and multiplex drive mode 1:9 (depending on VDD2value and LCD liquid properties)

Very low current consumption (20μA to 200μA):

  ‹Icon mode: < 25μA

  ‹Power-down mode: < 2μA

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 VDDas LCD supply voltage

Applications

Telecom equipment

Portable instruments

Point-of-sale terminals