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參數(shù)資料
| 型號： | HD66740TB0 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 50/MDR/RECP/VERT PRS FIT/M2.6/SCW/30MIN |
| 中文描述： | 112 × 80點圖形LCD控制器/驅(qū)動器 |
| 文件頁數(shù)： | 45/95頁 |
| 文件大?。?/td> | 856K |
| 代理商： | HD66740TB0 |
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HD66740
45
Liquid Crystal Display Voltage Generator
When External Power Supply and Internal Operational Amplifiers are Used
To supply LCD drive voltage directly from the external power supply without using the internal booster,
circuits should be connected as shown in figure 22. Here, contrast can be adjusted by software through
the CT bits of the contrast adjustment register.
The HD66740 incorporates a voltage-follower operational amplifier for each V1 to V5 to reduce current
flowing through the internal bleeder-resistors, which generate different levels of liquid-crystal drive
voltages. Thus, potential differences between V
LCD
and V1 and between V5 and GND must be 0.4 V or
higher. Note that the OPOFF pin must be grounded when using the operational amplifiers. Place a
capacitor of about 0.1 μF to 0.5 μF between each internal operational amplifier V1OUT to V5OUT
output and GND and stabilize the output level of the operational amplifier.
C1+
C1-
C2+
C2-
C3+
C3-
C4+
C4-
V
LCD
V
LCD
VR
R
0
R
R
R
-
+
-
+
-
+
-
-
GND
Booster
OPOFF = GND
R
HD66740
V1OUT
+
V2OUT
V3OUT
V4OUT
V5OUT
+
+
+
+
LCD
driver
SEG1 to SEG112
COM1 to COM80
V1
V3
V4
V2
V5
GND
Vci
VLOUT
0.1
μ
F
to 0.5
μ
F
GND
Figure 22 External Power Supply Circuit for LCD Drive Voltage Generation
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66740WTB0 | 112 x 80-dot Graphics LCD Controller/Driver |
| HD66751 | 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66750TB0 | 122 x 32 pixel format, Compact LCD size |
| HD66750 | 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66751TB0 | 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66740WTB0 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:112 x 80-dot Graphics LCD Controller/Driver |
| HD66741 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66750 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66750TB0 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66751 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
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