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參數(shù)資料
| 型號： | HD66705U |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver(圖形LCD控制器/驅(qū)動器) |
| 中文描述： | 低功耗點(diǎn)陣液晶顯示控制器/驅(qū)動器（圖形液晶顯示控制器/驅(qū)動器） |
| 文件頁數(shù)： | 48/81頁 |
| 文件大?。?/td> | 426K |
| 代理商： | HD66705U |
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HD66705U
48
Power Supply for Liquid Crystal Display Drive
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 30. Here, contrast can be adjusted through the CT bits of
the contrast-control instruction.
The
HD66705U
incorporates a voltage-follower operational amplifier for each of 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
CC
and V1 and between V
EE
and V5 must be 0.4V or greater.
Note that the OPOFF pin must be grounded when using the operational amplifiers.
V
CC
V2
V3
V
CC
R
V1
V2
V3
V4
V5
R
R
R
R
V
EE
VR
–
+
+
–
–
+
+
–
+
SEG1–SEG60
COM1–COM16
COMS1–COMS2
GND
AGND
ASEG1–ASEG10
ACOM
–
V
EE
HD66705U
OPOFF = GND
1- or 2-line display with 1/4 bias
Note: 1. Potential differences between V
CC
and V1 and between V5 and V
EE
must be 0.4V or greater,
particularly for low-duty drive such as 1-line display.
2. When using the internal operational amplifiers, an capacitor must be inserted between each output
of V1OUT and V4OUT, and V
CC
to stabilize the operational amplifier output.
If the internal operational amplifiers cannot fully drive the LCD panel used, an appropriate capacitor
must be inserted between another outputs (V2OUT, V3OUT, V5OUT) and V
CC.
LCD
multiplexing
driver
LCD static
driver
V2 - V3:
short-circuit
V4OUT
V1OUT
0.1uF
to 0.5uF
Figure 30 External Power Supply Circuit Example for LCD Drive Voltage Generation
相關(guān)PDF資料 |
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| HD66710 | (Dot Matrix Liquid Crystal Display Controller/Driver) |
| HD66710A00FS | 16 AMP SPDT MINIATURE POWER RELAY |
| HD66710A00TF | (Dot Matrix Liquid Crystal Display Controller/Driver) |
| HD66712U | Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66710 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:(Dot Matrix Liquid Crystal Display Controller/Driver) |
| HD66710A00FS | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:(Dot Matrix Liquid Crystal Display Controller/Driver) |
| HD66710A00TF | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:(Dot Matrix Liquid Crystal Display Controller/Driver) |
| HD66712 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver |
| HD66712A00TA0 | 制造商:Renesas Electronics Corporation 功能描述: |
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