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參數(shù)資料
| 型號(hào)： | HD66726 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Graphics LCD Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動(dòng)器) |
| 中文描述： | 圖形液晶顯示控制器/鍵掃描功能（帶鍵掃描功能的圖形液晶顯示控制器/驅(qū)動(dòng)器驅(qū)動(dòng)程序） |
| 文件頁(yè)數(shù)： | 19/117頁(yè) |
| 文件大?。?/td> | 1549K |
| 代理商： | HD66726 |
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HD66726
19
Oscillation Circuit (OSC)
The HD66726 can provide R-C oscillation simply through the addition of an external oscillation-resistor
between the OSC1 and OSC2 pins. The appropriate oscillation frequency for operating voltage and frame
frequency can be obtained by adjusting the external-resistor value. Clock pulses can also be supplied
externally. Since R-C oscillation stops during the standby mode, current consumption can be reduced. For
details, see the Oscillation circuit section.
Liquid Crystal Display Driver Circuit
The liquid crystal display driver circuit consists of 42 common signal drivers (COM1 to COM40, COMS1,
and COMS2) and 96 segment signal drivers (SEG1 to SEG96). When the number of lines are selected by a
program, the required common signal drivers automatically output drive waveforms, while the other
common signal drivers continue to output unselected waveforms.
Character pattern data is sent serially through a 96-bit shift register and latched when all needed data has
arrived. The latched data then enables the segment signal drivers to generate drive waveform outputs.
The shift direction of 96-bit data can be changed by the SGS bit. The shift direction for the common driver
can also be changed by the CMS bit by selecting an appropriate direction for the device mounting
configuration.
When multiplexing drive is not used, or during the standby or sleep mode, all the above common and
segment signal drivers output the GND level, halting the display.
Booster (DC-DC Converter)
The booster doubles, triples, or quadruples a voltage input to the Vci pin. With this, both the internal logic
units and LCD drivers can be controlled with a single power supply. Boost output level from single to
quadruple boost can be selected by software. For details, see the Power Supply for Liquid Crystal Display
Drive section.
V-Pin Voltage Follower
A voltage follower for each voltage level (V1 to V5) reduces current consumption by the LCD drive power
supply circuit. No external resistors are required because of the internal bleeder-resistor, which generates
different levels of LCD drive voltage. This internal bleeder-resistor can be software-specified from 1/2 bias
to 1/8 bias, according to the liquid crystal display drive duty value. The voltage followers can be turned off
while multiplexing drive is not being used. For details, see the Power Supply for Liquid Crystal Display
Drive section.
Contrast Adjuster
The contrast adjuster can be used to adjust LCD contrast in 32 steps by varying the LCD drive voltage by
software. This can be used to select an appropriate LCD brightness or to compensate for temperature.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66727 | Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動(dòng)器) |
| HD66728 | 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點(diǎn)圖形LCD控制器) |
| HD66730 | Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器) |
| HD66731 | Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器) |
| HD66731A00TB0L | 122 x 32 pixel format, Compact LCD size |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66726A03TB0L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| HD66727 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function |
| HD66727A03 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66727A03BP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66727A03TA0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
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