参数资料
型号: SED122ADXA
元件分类: 显示控制器
英文描述: 16 X 60 DOTS DOT MAT LCD DRVR AND DSPL CTLR, UUC165
封装: DIE-165
文件页数: 9/50页
文件大小: 398K
代理商: SED122ADXA
SED1220
EPSON
4–17
SED1220
q Voltage Regulation Circuit Using Electronic Volume
Function
The electronic volume function allows to control the
liquid crystal drive voltage V5 with the commands and
thus to adjust density of the liquid crystal display.
Liquid crystal drive voltage V5 can have one of 32
voltage values if 5-bit data is set to the electronic volume
register.
[Sample constants setting when electronic volume function is used]
V5 = (1 +
Rb
) VEV
............................... 2
Ra
Where VEV = VREG
α
α = VREG / 150
When using the electronic volume function, you need to
turn the voltage regulation circuit on using the supply
control command.
Ra
Rb
VR
V0
VEV
VDD
VREG
+
-
V5
0
α
n
..
No.
Electronic volume register
a
V5
0
(0, 0, 0, 0, 0)
0
Large
1
(0, 0, 0, 0, 1)
1
α
2
(0, 0, 0, 1, 0)
2
α
3
(0, 0, 0, 1, 1)
3
α
30
(1, 1, 1, 1, 0)
(n-1)
α
31
(1, 1, 1, 1, 1)
n
α
Small
When the electronic volume function is not used, select (0, 0, 0, 0, 0) for the electronic volume register.
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