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參數(shù)資料
| 型號： | HCD66750BP |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| 中文描述： | 128 × 128點圖形LCD控制器/驅(qū)動器，四灰度函數(shù) |
| 文件頁數(shù)： | 58/96頁 |
| 文件大?。?/td> | 2068K |
| 代理商： | HCD66750BP |
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HD66750/1
58
Example of Power-supply Voltage Generator for More Than Seven-times Boosting Output
The HD66750/1 incorporates a booster for up to seven-times boosting. However, the LCD drive voltage
(VLCD) will not be enough for seven-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.
When the boosting factor is high, the current driving ability is lowered and insufficient display quality may
result. In this case, the boosting ability can be improved by decreasing the boosting factor as shown in the
booster in figure 39.
Set the Vci input voltage for the booster to 3.6 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
(16.5 V).
C1+
C1 D
Vci
VLOUT
GND
(+)
C2+
C2 D
C3+
Booster
C3 D
C4+
C4 D
LCD driver
SEG1 to SEG128
COM1 to COM128
Regu-
lator
(2)
Vci
Regu-
lator
(1)
Logic circuit
1.8 V
2.2 V
VLCD
GND
GND
GND
2.2 V x 7 = 15.4 V
Battery
3.6 V
GND (= 0 V)
Vcc (= 1.8 V)
Vci (= 2.2 V)
HD66750/ 1
VLCD (= 15.4 V)
C5+
C5 D
C6+
C6 D
Note: In practice, the LCD drive current lowers
the voltage in the boosting output voltage.
(+)
1
μ
F
(B Charac-
terstics)
(+)
1
μ
F
(B Charac-
teristics)
(+)
1
μ
F
(B Charac-
teristics)
(+)
1
μ
F
(B Charac-
teristics)
(+)
1
μ
F
(B Charac-
teristics)
(+)
1
μ
F
(B Charac-
teristics)
1
μ
F
(B Charac-
terstics)
Figure 39 Usage Example of Booster at Vci > Vcc
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