參數(shù)資料
型號(hào)： ML9040-Axx
廠商： OKI SEMICONDUCTOR CO., LTD.
英文描述： DOT MATRIX LCD CONTROLLER WITH 16-DOT COMMON DRIVER AND 40-DOT SEGMENT DRIVER
中文描述： 點(diǎn)陣LCD控制器的16交通部通用驅(qū)動(dòng)器和40段驅(qū)動(dòng)交通部
文件頁(yè)數(shù)： 33/47頁(yè)
文件大?。?/td> 434K
代理商： ML9040-AXX
ML9040-Axx/-Bxx
Semiconductor
33
Interface with LCD and MSM5259
Display examples when setting the 5 x 7 dots character font 1-line mode, 5 x 10 dots character font
1-line mode, and 5 x 7 dots character font 2-line mode through instructions are shown in Figures
4, 5, and 6, respectively.
When the 5 x 7 dots character font is set in the 1-line display mode, the COM signals COM
9
to
COM
16
are output for extinguishing.
Likewise, when the 5 x 10 dots character font (1-line is set), the COM signals COM
12
to COM
16
are output for display-off.
The display example shows a combination of 16 characters (32 characters for the 2-line display
mode) and the LCD. When the number of MSM5259s are increased according to the increase in
the number of characters, it is possible to display a maximum of 80 characters.
Besides, it is necessary to generate bias voltage required for LCD operation by splitting resistors
outside the IC to input it to ML9040-Axx/-Bxx and MSM5259.
Examples of these bias voltages are shown in Figures 7, 8, 9, and 10. Basically, this can be done
by dividing the voltage by the resistors as shown in Figures 7 and 8. If the value of resistor R is
made larger to reduce system power consumption, the LCD operating margin decreases and the
LCD driving waveform is distorted. To prevent this, a by-pass capacitor is serially connected to
the resistor to lower voltage division impedance caused by the splitting of resistors as shown in
Figures 9 and 10.
As the values of R, VR, and C vary according to the LCD size used and V
LCD
(LCD drive voltage),
these values have to be determined through actual experimentation in combination with the
LCD.
(Example set values: R = 3.3 to 10k
W
, V
R
= 10 to 30k
W
, and C = 0.0022
m
F to 0.047
m
F)
Figure 17 shows an application circuit for the ML9040-Axx/-Bxx and MSM5259 including a bias
circuit.
The bias voltage has to maintain the following potential relation:
V
DD
> V
1
> V
2
≥
V
3
> V
4
> V
5
In the case of 1-line 16 characters display (5 x 7 dots/font)
Figure 4
COM
1
SEG
1
SEG
40
O
1
O
40
ML9040-Axx/-Bxx/-Cxx/-Dxx
DO
CP
DF
L
DI
1
CP
MSM5259
DF
LOAD
DO
20
DI
21
LCD
COM
8
相關(guān)PDF資料
PDF描述
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