參數(shù)資料
型號(hào)： HCD66717A03
廠商： Hitachi,Ltd.
元件分類(lèi)： 晶體
英文描述： (Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver)
中文描述： （低功耗點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器）
文件頁(yè)數(shù)： 53/90頁(yè)
文件大?。?/td> 716K
代理商： HCD66717A03
HD66717
505
When an Internal Booster and Internal Operational Amplifiers are Used
To supply LCD drive voltage using the internal booster, circuits should be connected as shown in Figure
31. Here, contrast can be adjusted through the CT bits of the contrast-control instruction. Temperature
can be compensated either through the CT bits or by controlling the reference voltage for the booster (Vci
pin) using a thermistor.
Note that Vci is both a reference voltage and power supply for the booster; the reference voltage must
therefore be adjusted using an emitter-follower or a similar element so that sufficient current can be
supplied. In this case, Vci must be equal to or smaller than the V
CC
level.
The HD66717 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.
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
HD66717
Note: 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
5 V 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 32.
a) Double boosting
C1
C2
Vci
V5OUT2
V5OUT3
+
GND
+
V
CC
V2
V3
V
CC
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
HD66717
–
–
–
–
–
V1
V2
V3
V4
V5
Figure 31 Internal Power Supply Circuit Example for LCD Drive Voltage Generation
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