参数资料
型号: SED1241DAB
元件分类: 显示控制器
英文描述: 24 X 80 DOTS DOT MAT LCD DRVR AND DSPL CTLR, UUC210
封装: DIE-210
文件页数: 10/67页
文件大小: 736K
代理商: SED1241DAB
8–18
EPSON
SED1240 Series
Voltage regulating circuit using the electronic volume
function
When the electronic volume function is used, the
liquid crystal drive voltage V5 can be controlled by the
command to adjust the density of liquid crystal display.
Regarding this method, set 5-bit data in the electronic
volume register, and the liquid crystal drive voltage
V5 can take one of 32 states of voltage value.
When the electronic volume function is used, the
voltage regulating circuit must be turned on by the
power control command.
+
0
α
V5
Rb
Ra
VR
V0
VDD
VEV
VREG
n a
[Constant setup example when using the electronic volume function]
Table 6
V5 = (1 +
Rb
)
× VEV
Ra
However: VEV = VREG
α
α = VREG / 150
No.
Electronic volume register
α
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, set the electronic volume register to (0,0,0,0,0).
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