NXP公司的PCF2119x 是低功耗LCD控制器和驅(qū)動器,可以驅(qū)動2行16字符或1行32字符的點陣LCD顯示器,其功能包括片內(nèi)LCD偏壓產(chǎn)生,和大多數(shù)MCU通過4位或8位總線或2線I2C總線來連接.主要應(yīng)用在通信設(shè)備,手提儀器和POS終端.本文介紹了PCF2119x主要特性和優(yōu)勢, 方框圖以及典型應(yīng)用電路,和MCU連接方式.
PCF2119x: LCD controllers/drivers
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.
The letter ‘x’ in PCF2119x characterizes the built-in character set. Various character sets can be manufactured on request. In addition 16 user defined symbols (5 × 8 dot format) are available.
PCF2119x主要特性和優(yōu)勢:
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 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: 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
VLCD generator supply voltage: VDD2 − VSS2 = 2.2 V to 4 V and
VDD3 − VSS2 = 2.2 V to 4 V
Direct mode to save current consumption for icon mode and multiplex drive mode depending on VDD2 value and LCD liquid properties)
Very low current consumption (20 μA to 200 μA):
Icon mode: < 25 μA
Power-down mode: < 2 μA
Icon mode is used to save current. When only icons are displayed, a much lower operating voltage can be used and the switching frequency of the LCD outputs is reduced; in most applications it is possible to use VDD as LCD supply voltage
PCF2119x應(yīng)用:
Telecom equipment
Portable instruments
Point-of-sale terminals
圖1.PCF2119x方框圖
圖2.PCF2119x采用并行接口,4位或8位總線的應(yīng)用框圖
圖3.PCF2119x采用I2C總線接口的應(yīng)用框圖
圖4.PCF2119x和2x16字符LCD的連接框圖
圖5.PCF2119x和1x32字符LCD的連接框圖
詳情請見:
http://www.nxp.com/documents/data_sheet/PCF2119X.pdf
