基于PCF8811 LCD驅(qū)動方案
出處:NXP 發(fā)布于:2011-08-18 11:16:50
NXP (恩智浦半導(dǎo)體)是一家新近獨立的半導(dǎo)體公司,由飛利浦公司創(chuàng)立,已擁有五十年的悠久歷史,主要提供工程師與設(shè)計人員各種半導(dǎo)體產(chǎn)品與軟件,為移動通信、消費類電子、安全應(yīng)用、非接觸式付費與連線,以及車內(nèi)娛樂與網(wǎng)絡(luò)等產(chǎn)品帶來更優(yōu)質(zhì)的感知體驗。PCF8811是由NXP 公司推出的,具有8位并行接口,3/4路SPI和高速I2C總線,適合于以電池為能源的系統(tǒng),主要用于汽車顯示器,通信設(shè)備,手提儀表和POS終端。
LCD對于許多的用戶而言可能是一個并不算新鮮的名詞了,不過這種技術(shù)存在的歷史可能遠遠超過了我們的想像 -早在19世紀末,奧地利植物學(xué)家就發(fā)現(xiàn)了液晶,即液態(tài)的晶體,也就是說一種物質(zhì)同時具備了液體的流動性和類似晶體的某種排列特性。在電場的作用下,液晶分子的排列會產(chǎn)生變化。從而影響到它的光學(xué)性質(zhì),這種現(xiàn)象叫做電光效應(yīng)。利用液晶的電光效應(yīng),英國科學(xué)家在上世紀制造了塊液晶顯示器即LCD.今天的液晶顯示器中廣泛采用的是定線狀液晶,如果我們微觀去看它,會發(fā)現(xiàn)它特象棉花棒。與傳統(tǒng)的CRT相比,LCD不但體積小,厚度?。壳?4.1英寸的整機厚度可做到只有5厘米),重量輕、耗能少(1到10 微瓦/平方厘米)、工作電壓低(1.5到6V)且無輻射,無閃爍并能直接與CMOS集成電路匹配。
PCF8811:80 x 128 pixels matrix LCD driver
The PCF8811 is a low-power CMOS1 LCD controller and driver, designed to drive a graphic display of 80 rows and 128 columns or a graphic display of 79 rows and 128 columns and an icon row of 128 symbols. All necessary functions for the display are provided in a single chip, including on-chip generation of the LCD supply and bias voltages, resulting in a minimum of external components and low power consumption. The PCF8811 can interface microcontrollers via a parallel bus, serial bus or I2C-bus interface.
PCF8811主要特性和優(yōu)勢:
Single-chip LCD controller and driver
80 row and 128 column outputs
Display data RAM 80 × 128 bit
128 icons (row 80 can be used for icons in extended command set and when icon rows are enabled)
Low power consumption; suitable for battery operated systems
Interfaces: an 8-bit parallel interface, 3 or 4-line Serial Peripheral Interface (SPI) and High-speed I2C-bus
On-chip:
Configurable voltage multiplier generating LCD supply voltage VLCD; an external VLCD is also possible
Linear temperature compensation of VLCD; 8 programmable temperature coefficients (extended command set); one fixed temperature coefficient which can be set as default by OTP programming (basic command set)
Generation of intermediate LCD bias voltage
Oscillator requires no external components
OTP calibration for VLCD and accurate frame frequency
External reset input pad
External clock input possible
Multiplex rate: 1:16 to 1:80 in steps of 8 when no icon row is used; with the icon row, steps of 16 can be used
Logic supply voltage range VDD1 to VSS:
1.7 V to 3.3 V
High-voltage multiplier supply voltage range VDD2, VDD3 to VSS:
1.8 V to 3.3 V
Display supply voltage range VLCD to VSS:
3 V to 9 V
Programmable bottom row pads mirroring; for compatibility with both Tape Carrier Packages (TCP) and Chip-On-Glass (COG) applications (extended command set)
Status read, which allows for chip recognition and content checking of some registers
Start address line which allows, for instance, the scrolling of the displayed image
Programmable display RAM pointers for variable display sizes
Slim chip layout, suited for COG applications
Temperature range: Tamb = ?40℃ to +85℃
CMOS compatible inputs
PCF8811應(yīng)用:
Automotive displays
Telecom equipment
Portable instruments
Point-of-sale terminals

圖1。PCF8811方框圖

圖2。PCF8811應(yīng)用框圖:內(nèi)部電荷泵和單電源

圖3。PCF8811應(yīng)用框圖:內(nèi)部電荷泵和兩個分立電源(VDD1和VDD2)

圖4.PCF8811應(yīng)用框圖:外接高壓
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