參數(shù)資料
型號: HD66760
廠商: Hitachi,Ltd.
英文描述: 104 X 80-dot Graphics LCD Controller/Driver for 256 Colors
中文描述: 104 × 80點(diǎn)圖形LCD控制器/驅(qū)動(dòng)器的256色
文件頁數(shù): 79/105頁
文件大?。?/td> 653K
代理商: HD66760
HD66760
79
Example of Power-supply Voltage Generator for More Than Seven-times Step-up Output
The HD66760 incorporates a step-up circuit for up to six-times step-up. However, the LCD drive voltage
(VLCD) will not be enough for six-times step-up 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 step-up can be set higher than the power-supply voltage of Vcc.
Set the Vci input voltage for the step-up circuit to 3.6 V or less within the range of Vcc + 1.0 V. Control the
Vci voltage so that the step-up output voltage (VLOUT) should be less than the absolute maximum ratings
(16.5 V).
SEG1 to SEG312
COM1 to COM80
(+)1
μ
F
(B Charac-
teristics)
(+)1
μ
F
(B Charac-
(+)1
μ
F
(B Charac-
(+)1
μ
F
(B Charac-
(+)1
μ
F
(B Charac-
(+)1
μ
F
(B Charac-
C1+
C1 –
Vci
VLOUT
GND
C2+
C2 –
Step-up circuit
C3+
C3 –
C4+
C4 –
Operational
amplifier
Regulator
(2)
Regulator
(1)
Vcc
Logic circuit
2.0 V
2.2 V
VLPS
GND
GND
GND
2.2 V x 7 = 15.4 V
Battery
3.6 V
GND (= 0 V)
Vcc (= 2.0 V)
Vci (= 2.2 V)
HD66760
VLCD (= 15.4 V)
(VLPS-GND)
C5+
C5 –
C6+
C6 –
Note: In practice, the LCD drive current lowers
the voltage in the step-up output voltage.
V 1OUT
Vci or Vci
(+)
1
μ
F
(B Charac-
Figure 54 Usage Example of Step-up Circuit at Vci > Vcc
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