參數(shù)資料
型號(hào)： HD66725
廠商： Hitachi,Ltd.
英文描述： Graphics LCD Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動(dòng)器)
中文描述： 圖形液晶顯示控制器/鍵掃描功能（帶鍵掃描功能的圖形液晶顯示控制器/驅(qū)動(dòng)器驅(qū)動(dòng)程序）
文件頁數(shù)： 66/117頁
文件大?。?/td> 834K
代理商： HD66725
HD66724/HD66725
66
Oscillator Circuit
The HD66724/HD66725 can either be supplied with operating pulses externally (external clock mode),
oscillate using an internal CR oscillator with an external oscillator-resistor (external resistor oscillation
mode), or oscillate using an internal oscillator-resistor (internal resistor oscillation mode). Internal
oscillator-resistors fluctuate by
±
30% depending on products. Avoid frame frequency fluctuations as these
affect video quality. To prevent these, use an external resistor.
OSC1
OSC1
OSC2
Clock
(32 kHz)
Rf
The oscillator frequency can be
adjusted by oscillator resistor
(Rf). If Rf is increased or power
supply voltage is decreased, the
oscillator frequency decreases.
For the relationship between Rf
resistor value and oscillation
frequency, see the Electric
Characteristics Footnote section.
HD66724
HD66725
1) External clock mode
2) External resistor oscillation mode
3) Internal resistor oscillation mode
HD66724
HD66725
OSC1
OSC2
Rf
0
(= 650 k
/typ.)
HD66724
HD66725
Rf
1
(= 350 k
/typ.)
Rf
2
(= 100 k
/typ.)
R1
R2
R3
Note that the internal resistors RF0, RF1, and RF2
fluctuate by
±
30% depending on products.
i) R1-OSC2 short-circuiting
Rf = Rf
0
= 650 k
(typ.)
ii) R1-R2 short-circuiting, R3-OSC2 short-circuiting
Rf = Rf
0
+ Rf
2
= 750 k
(typ.)
iii) R2-OSC2 short-circuiting
Rf = Rf
0
+ Rf
1
= 800 k
(typ.)
iv) R3-OSC2 short-circuiting
Rf = Rf
0
+ Rf
1
+ Rf
2
= 900 k
(typ.)
Figure 34 Oscillator Circuits
Table 36
Multiplexing Duty Ratio and LCD Frame Frequency (fosc = 32 kHz)
Item
Segment mode
(NL2/1/0 = 000)
1-Line Display
(NL2/1/0 = 001)
2-Line Display
(NL2/1/0 = 010)
3-Line Display
(NL2/1/0 = 011)
Multiplexing duty ratio
1/2
1/10
1/18
1/26
Optimum drive bias
(recommended value)
1/2
1/4
1/5
1/6
Frame frequency
80 Hz
80 Hz
74 Hz
77 Hz
相關(guān)PDF資料
PDF描述
HD66726 Graphics LCD Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動(dòng)器)
HD66727 Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動(dòng)器)
HD66728 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點(diǎn)圖形LCD控制器)
HD66730 Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器)
HD66731 Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD66725A03TA0L 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD CONTROLLER
HD66726 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
HD66726A03TB0L 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC
HD66727 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function
HD66727A03 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
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