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参数资料
| 型号： | SSD1801Z |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | LCD Segment / Common Driver with Controller for Character Display System |
| 中文描述： | LCD段/通用驱动器与控制器的字符显示系统 |
| 文件页数： | 20/42页 |
| 文件大小： | 762K |
| 代理商： | SSD1801Z |
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SSD1801 Series
Rev 1.1
01/2003
SOLOMON
19
2. Voltage Regulator
The feedback gain control for LCD driving contrast can be adjusted by using reference voltage and external
resistor network. The reference voltage is selected by REF pin. When it is pulled low, internal voltage reference
V
REF
is used. When it is pulled high, external voltage reference V
EXT
will be in use. The external resistors are
required to be connected between AV
SS
and V
F
(R1), and between V
F
and V
L6
(R2). The following equations are
used to calculate the regulator output voltages.
When REF is low:
R
V
V
×
1
AND
06
.
2
±
=
V
V
REF
When REF is high:
2
R
1
V
V
×
3. Contrast Control
Software control of the 32 contrast voltage levels at each voltage regulator feedback gain. The equation of calculating
the LCD driving voltage is given as:
When REF is low:
150
1
R
When REF is high:
150
1
R
where n is set in contrast control register.
REF
L
out
V
R
+
1
=
=
2
6
EXT
V
6
L
out
1
R
+
=
=
1
×
×
+
1
=
=
2
6
n
V
R
V
V
REF
L
out
1
×
×
+
1
=
=
2
6
n
V
R
V
V
EXT
L
out
Table 7- Contrast Control Register
No.
1
2
3
4
.
.
.
31
32
X7
-
-
-
-
-
-
-
-
X6
-
-
-
-
-
-
-
-
X5
-
-
-
-
-
-
-
-
X4
0
0
0
0
.
.
.
1
1
X3
0
0
0
0
.
.
.
1
1
X2
0
0
0
0
.
.
.
1
1
X1
0
0
1
1
.
.
.
1
1
X0
0
1
0
1
.
.
.
0
1
n
Vout
Maximum
.
.
.
.
.
.
.
Minimum
Contrast
High
.
.
.
.
.
.
.
Low
(“ - “: Don’t care)
0 (default)
1
2
3
.
.
.
30
31
4. Bias Divider
Divide the regulator output to give the LCD driving voltages (V
L5
-V
L2
). A low power consumption circuit design in
this bias divider saves most of the display current comparing to traditional design.
5. Bias Ratio Selection circuitry
相关PDF资料 |
PDF描述 |
|---|---|
| SSD1812 | LCD Segment / Common Driver with Controller CMOS |
| SSD1812TR | LCD Segment / Common Driver with Controller CMOS |
| SSD1812Z | LCD Segment / Common Driver with Controller CMOS |
| SSD1815 | SEMICONDUCTOR TECHNICAL DATA |
| SSD1815T1R | SEMICONDUCTOR TECHNICAL DATA |
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