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nxp公司的PCF2119x 是低功耗LCD控制器和驱动器,可以驱动2行16字符或1行32字符的点阵LCD显示器,其功能包罗片内LCD偏压产生,和大多数MCU通过4位或8位总线或2线I2C总线来毗连.主要应用在通信设备,手提仪器和POS终端.本京电港论坛文章先容了PCF2119x主要特点和优势, 方框架图以及典范应用电路,和MCU毗连方式. 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主要特点和优势: 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应用: Telecom equipment Portable instruments Point-of-sale terminals |
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