參數(shù)資料
型號(hào)： KS0715
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Driver & Controller for STN LCD(STN LCD驅(qū)動(dòng)器和控制器)
中文描述： 驅(qū)動(dòng)程序
文件頁(yè)數(shù)： 24/50頁(yè)
文件大小： 255K
代理商： KS0715
KS0715 33COM/100SEG DRIVER & CONTROLLER FOR STN LCD
24
It is necessary to connect external regulator resistor Ra between VR and VSS, and Rb between V0 and VR.
Example: For the following requirements.
1. LCD driver voltage, V0 = 8V
2. 5-bit reference voltage register = (1, 1, 1, 1, 1)
3. Maximum current flowing Ra, Rb = 1
μ
A
<Equation 3>
From Equation 1
<Equation 4>
From Equation 1
<Equation 5>
From requirement 3
From equations Equation 3, 4 and 5:
Ra = 1.9 [
]
Rb = 6.1 [
]
Table 12 shows the range of V0 depending on the above requirements.
VOLTAGE FOLLOWER CIRCUITS
V
LCD
voltage (V0) is resistively divided into four voltage levels (V1, V2, V3, V4), and those output impedance are
converted by the voltage follower to increase the driving capability. Table 13 shows the relationship between V1 to
V4 level and bias.
Table 12. The Range of V0
Electronic Volume Level
16
7.19
0
.......
.......
.......
.......
31
8
V0
6.33
Table 13. The Relationship Between V1 to V4 Level and Each Duty Ratio
Duty Ratio
1/33
LCD Bias
1/6
1/5
V1
V2
V3
V4
5/6
×
V0
4/5
×
V0
4/6
×
V0
3/5
×
V0
2/6
×
V0
2/5
×
V0
1/6
×
V0
1/5
×
V0
8
1
Ra
Rb
+
V
EV
×
[V]
=
V
EV
1
-31
31
–
(
)
150
–
1.9
= 1.9
×
[V]
=
Ra + Rb
-----------------------
1
μ
A
[
]
=
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