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參數(shù)資料
| 型號(hào)： | HD66725 |
| 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)： | 71/117頁(yè) |
| 文件大?。?/td> | 834K |
| 代理商： | HD66725 |
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HD66724/HD66725
71
When an Internal Booster and External Bleeder-Resistors are Used
When internal operational amplifiers cannot fully drive the LCD panel used, V1 to V5 voltages can be
supplied through external bleeder-resistors (figure 39). Here, the OPOFF pin must be set to the V
CC
level to
turn off the internal operational amplifiers. Since the internal contrast adjuster is disabled, contrast must be
adjusted externally. Connection of external bleeder-resistors can specify a given bias value from 1/2 to 1/6.
Figure 39 shows connection for 1/6-bias drive voltage generation. Double- and triple-boosters can be used
as they are.
C1+
C1-
Vci
VLOUT
+
VLCD
V1OUT
V2OUT
V3OUT
V4OUT
V5OUT
-+
-+
-+
-+
-+
GND
Booster
GND
+
0.47
μ
F
to 1
μ
F
0.47
μ
F
to 1
μ
F
HD66724/5
OPOFF = Vcc
VR
R
2R
R
R
R
C2+
C2-
+
0.47
μ
F
to 1
μ
F
Vci
GND
SEG1 to SEG72 (96)
COM1 to COM24
COMS1 to COMS2
V1
V2
V3
V4
V5
GND
LCD
driver
Notes:
1. Resistance of each external bleeder resistor should be 4.7 k
to 25 k
.
2. The bias current value for driving LCDs can be varied by adjusting the resistance (2R)
between the V3OUT and V4OUT pins.
3. The internal contrast adjuster is disabled; contrast must be adjusted either by controlling the
external variable resistor between VLCD and V1 for the booster.
4. Vci is both a reference voltage and power supply for the booster; connect it to Vcc directly or
combine it with a transistor so that sufficient current can be obtained.
5. Vci must be smaller than Vcc.
Figure 39 Circuit Using External Bleeder-Resistors
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66726 | 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) |
| 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) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66725A03TA0L | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:LCD CONTROLLER |
| HD66726 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66726A03TB0L | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Industrial Control IC |
| HD66727 | 制造商:HITACHI 制造商全稱(chēng):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(chēng):未知廠家 功能描述:LCD Display Driver |
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