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參數(shù)資料
| 型號： | HD66727A04TA0L |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function |
| 中文描述： | 低功耗點陣液晶顯示控制器/鍵掃描功能驅(qū)動程序 |
| 文件頁數(shù)： | 62/97頁 |
| 文件大?。?/td> | 513K |
| 代理商： | HD66727A04TA0L |
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HD66727
62
Short-circuited
for 1-or 2-line
display
b) Triple boosting
C1
C2
Vci
V5OUT2
V5OUT3
+
GND
+
V
CC
V2
V3
V
CC
R
V1
V2
V3
V4
V5
R
R
R
R
VR
–
–
–
–
–
R
V
EE
Booster
GND
+
OPOF = GND
0.47
μ
F
to 1
μ
F
0.47
μ
F
to 1
μ
F
HD66727
Notes: 1. The reference voltage input (Vci) must be adjusted so that the output voltage after boosting will not exceed
the absolute maximum rating of the liquid-crystal power supply voltage (15V). Particularly, Vci must be
5V or less for triple boosting.
2. Vci is both a reference voltage and power supply for the booster; connect it to V
CC
directly or combine it with
a transistor so that sufficient current can be obtained.
3. Vci must be smaller than V
CC
.
4. To operate the voltage-follower correctly, 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.
5. Polarized capacitors must be connected correclty.
6. Circuits for temperature compensation should be designed based on the sample circuit shown in figure 35.
7. The HD66727's internal operational amplifiers have a reduced drive current to save current consumption;
when the internal operational amplifiers cannot fully drive the LCD panel used, an appropriate capacitor must
be inserted between each output of V1OUT to V5OUT and V
CC
to stabilize the operational amplifier output
(Figure 36).
a) Double boosting
C1
C2
Vci
V5OUT2
V5OUT3
+
GND
+
V
CC
V2
V3
CC
V
R
R
R
R
R
VR
R
V
EE
Short-circuited
for 1-or 2-line
display
OPOFF = GND
-
-
-
-
-
Booster
0.47
μ
F
to 1
μ
F
0.47
μ
F
to 1
μ
F
HD66727
–
–
–
–
–
V1
V2
V3
V4
V5
Figure 34 Internal Power Supply Circuit Example for LCD Drive Voltage Generation
V
CC
Thermistor
GND
Tr
V
CC
Vci
HD66727
Figure 35 Temperature Compensation Circuit Example
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