ssd1800 ETC-unknow, ssd1800 Datasheet - Page 22

• Manufacturer Part Number: ssd1800
• Description: 80x16 + 1 Icon Line Lcd Segment / Common Driver With Controller For Character Display System
• Manufacturer: ETC-unknow

resistor network. The reference voltage is supplied by internal Vref and Ref should be connected to low for normal
operation of internal voltage reference Vref. The external resistors are required to be connected between AV
V
AND
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:
where n is set in contrast control register.
4. Bias Divider
this bias divider saves most of the display current comparing to traditional design.
5. Bias Ratio Selection circuitry
V
Solomon Systech
F
L
(R1), and between V
6
The feedback gain control for LCD driving contrast can be adjusted by using reference voltage and external
Divide the regulator output to give the LCD driving voltages (V
Software control of 1/4 and 1/5 bias ratio to match the characteristic of LCD panel.
=



No.
1
31
32
V
V
1
2
3
4
.
.
.
+
L
REF
6
R
R
=
1
2
= V






X7
1
2 ±
×
-
-
-
-
-
-
-
-
+
V
R
REF
R
2
1
F
. 0
X6
and V



×
-
-
-
-
-
-
-
-
06
×



V
1
−
REF
L6
X5
-
-
-
-
-
-
-
-
150
(R2). The following equations are used to calculate the regulator output voltages.
n



X4
Table 7- Contrast Control Register
0
0
0
0
1
1
.
.
.
X3
0
0
0
0
1
1
.
.
.
X2
0
0
0
0
1
1
.
.
.
2. Voltage Regulator
X1
0
0
1
1
1
1
.
.
.
X0
0
1
0
1
0
1
.
.
.
L5
Mar 2004
-V
L2
0 (default)
). A low power consumption circuit design in
30
31
n
1
2
3
.
.
.
P 22/42 Rev 1.0
Maximum
Minimum
VL6
.
.
.
.
.
.
.
(“ - “: Don’t care)
Contrast
SSD1800 Series
High
Low
.
.
.
.
.
.
.
SS
and