參數(shù)資料
型號: HD66728
廠商: Hitachi,Ltd.
英文描述: 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點圖形LCD控制器)
中文描述: 112 × 80點圖形LCD控制器/驅(qū)動器(112 × 80點圖形液晶顯示控制器)
文件頁數(shù): 80/138頁
文件大?。?/td> 2158K
代理商: HD66728
HD66728
80
Example of Power-supply Voltage Generator for More Than Five-times Boosting Output
The HD66728 incorporates the booster for up to five-times boosting. However, the LCD drive voltage
(VLCD) will not be enough for five-times boosting from Vcc when the power-supply voltage of Vcc is low
or when the LCD drive voltage is high for the high-contrast LCD display. In this case, the reference
voltage (Vci) for boosting can be set higher than the power-supply voltage of Vcc.
Set the Vci input voltage for the booster to 5.5 V or less within the range of Vcc + 1.0 V. Control the Vci
voltage so that the boosting output voltage (VLOUT) should be less than the absolute maximum ratings (17
V).
+
1
μ
F
+
+
+
1
μ
F
1
μ
F
1
μ
F
SEG1 to SEG112
COM1 to COM80
C1+
C1-
C2+
Vci
1
μ
F
VLOUT
GND
+
C2-
C3+
Booster
C3-
C4+
C4-
LCD driver
Regula
-tor
(2)
Regula
-tor
(1)
Vcc
Logic circuit
2.5 V
3.0 V
VLCD
GND
GND
GND
3.0 x 5 = 15 V
Battery
3.6 V
GND (= 0 V)
Vcc (= 2.5 V)
Vcc (= 3 V)
VLCD (= 15 V)
HD66728
Figure 45 Usage Example of Booster at Vci > Vcc
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