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參數資料
型號： HM17CM256
廠商： HYNIX SEMICONDUCTOR INC
元件分類： 顯示驅動器
英文描述： 128XRGBX82 OUTPUT LCD DRIVER IC with built-in RAM
中文描述： LIQUID CRYSTAL DISPLAY DRIVER, UUC580
封裝： 19.75 X 2.39 MM, GOLD BUMP, DIE-580
文件頁數： 39/111頁
文件大小： 2094K
代理商： HM17CM256
HM17CM256
- 39 -
(24) ELECTRIC VOLUME
The electric volume is within voltage converting circuit and the brightness of LCD can be controlled
by adjusting V
LCD
level with command.
The LCD driving voltage V
LCD
is generated by selecting 1 level within 128 step electric volume
controlled levels by setting 7 bit electric volume register.
(25) VOLTAGE REGULATOR CIRCUIT
The voltage regulator circuit is within voltage converting circuit and generates regulated voltage
using V
REF
input with magnification by adjusting internal resistor. The generated voltage by voltage
regulator is output at V
REG
terminal. Even though boosted voltage variation, generated regulator
voltage is stable because boosting voltage level is higher than the amplified regulator voltage V
REG
.
And so, stable voltage level can be generated even if there is load variation.
V
REG
is used as input voltage of electric volume circuit to generate LCD driving voltage.
(26) REFERENCE VOLTAGE GENERATION CIRCUIT
The reference voltage generation circuit is within voltage converting circuit.
This circuit generates reference voltage V
BA
terminal for using at regulator circuit through. The
output voltage level from V
BA
terminal is as following description.
V
BA
= V
EE
x 0.9
The LCD driving voltages can be made by applying reference voltage to reference voltage input
terminal V
REF
.
(27) LCD DRIVING VOLTAGE GENERATION CIRCUIT
The generation circuit of LCD driving voltage is within voltage converting circuit and generates
voltages V
LCD
, V
1
, V
2
, V
3
, V
4
by resistively dividing V
LCD
into 4 levels.
The bias ratio of LCD driving voltages can be one of 1/5, 1/6, 1/7, 1/8, 1/9, 1/10.
When using built-in power supply circuit, you should connect voltage stabilization capacitor CA
2
at
each of LCD power terminals. There is need for selecting the coefficient of capacitor CA
2
after
display the LCD.
When using external voltage supply, disable the built-in power supply circuit(AMPON, DCON=‘00’),
supply the V
OUT
, V
LCD
, V
1
, V
2
, V
3
, V
4
voltages externally and open the C
1
+ , C
1
- , C
2
+ , C
2
- , C
3
+ , C
3
- ,
C
4
+ , C
4
- , C
5
+ , C
5
- , C
6
+ , C
6
- , V
EE
, V
REF
, V
REG
terminals.
When using external voltage source and parts of built-in voltage converting circuit, the terminals of
C
1
+ , C
1
- , C
2
+ , C
2
- , C
3
+ , C
3
- , C
4
+ , C
4
- , C
5
+ , C
5
- , C
6
+ , C
6
- should be open because boosting
circuit is not activated, you should supply reference voltage through V
REF
terminal and the voltage for
voltage converting circuit at V
OUT
.
Connecting stabilization capacitor CA
3
at V
REG
terminal is recommended.
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相關代理商/技術參數
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