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參數(shù)資料
| 型號： | HD66740WTB0 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 112 x 80-dot Graphics LCD Controller/Driver |
| 中文描述： | 112 × 80點圖形LCD控制器/驅動器 |
| 文件頁數(shù)： | 42/95頁 |
| 文件大?。?/td> | 856K |
| 代理商： | HD66740WTB0 |
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HD66740
42
Oscillation Circuit
The HD66740 can either be supplied with operating pulses externally (external clock mode) or oscillate
using an internal R-C oscillator with an external oscillator-resistor (external resistor oscillation mode).
Note that in R-C oscillation, the oscillation frequency is changed according to the internal capacitance
value, the external resistance value, or operating power-supply voltage. Insert the dumping registance
of about 1.5k
to prevent malfunctions caused by over-shoot or under-shoot noise in the external clock
mode.
1) External clock mode
2) External resistor oscillation mode
OSC1
OSC1
OSC2
Clock
(80 kHz)
Insert the dumping resistance.
Rf
The oscillator frequency can be
adjusted by oscillator resistor
(Rf). If Rf is increased or power
supply voltage is decreased, the
oscillation frequency decreases.
For the relationship between Rf
resistor value and oscillation
frequency, see the Electric
Characteristics Notes section.
HD66740
HD66740
1.5 k
Figure 19 Oscillation Circuits
Table 17
Relationship between Drive Duty Ratio and Frame Frequency (fosc = 75 kHz)
Display mode
1-line
Dis-
play
2-line
Dis-
play
3-line
Dis-
play
4-line
Dis-
play
5-line
Dis-
play
6-line
Dis-
play
7-line
Dis-
play
8-line
Dis-
play
9-line
Dis-
play
10-line
Dis-
play
Set value for NL3–0
LCD Drive
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
Multiplexing
duty ratio
1/8
1/16
1/24
1/32
1/40
1/48
1/56
1/64
1/72
1/80
Drive bias
(recommend-
ed value)
1/4
1/5
1/6
1/6
1/7
1/8
1/8
1/9
1/9.5
1/10
Frame
frequency
73 Hz
73 Hz
73 Hz
73 Hz
72 Hz
74 Hz
74 Hz
73 Hz
65 Hz
59 Hz
One-frame
frequency
Note:
1,024
1,024
1,032
1,024
1,040
1,008
1,008
1,024
1,152
1,280
If the frame frequency is low and the display flickers, increase the oscillation frequency (fosc).
Particularly in the 9-line display and 10-line display modes, note that the frame frequency is
lowered.
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相關代理商/技術參數(shù) |
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|---|---|
| HD66741 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
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| HD66751 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
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