SSD1852T2R1 ETC [List of Unclassifed Manufacturers], SSD1852T2R1 Datasheet - Page 18

• Manufacturer Part Number: SSD1852T2R1
• Description: LCD Segment / Common Driver With Controller CMOS
• Manufacturer: ETC [List of Unclassifed Manufacturers]

13
SSD1852
7.8
3X Boost
Remarks: capacitor = 1.0 ~ 4.7uF
7.8.1
7.8.2 Voltage Regulator
7.8.3 Contrast Control (Voltages referenced to V
LCD Driving voltage Generator and Regulator
input and generates necessary bias voltages. It consists of:
V
V
C
C
C
C
C
C
C
CC
SS
1N
2N
5P
3P
1P
2P
4P
This module generates the LCD voltage needed for display output. It takes a single supply
to either internal (INTRS pin = H) or external (INTRS pin = L). If internal resistor network is
enabled, eight settings can be selected through software command. If external control is
selected, external resistors are required to be connected between V
between V
gains. The equations of calculating the LCD driving voltage are given as the following,
3X, 4X, 5X and 6X DC-DC voltage converter
Please refer to Figure 5.
Software control of the 64-contrast voltage levels at each voltage regulator feedback
V
V
The feedback gain control for LCD driving contrast curves can be selected by INTRS pin
-
+
-
+
+
-
Rev 1.0
01/2003
out
L
6
R
and V

 




1
1
Figure 5 - DC-DC Converter Configurations
4X Boost
L6
R
R
(R
63
V
C
C
V
C
C
C
C
C
CC
1
SS
2
210
5P
3P
1N
1P
2P
2N
4P
2
). See application circuit diagrams for detail connections.

 

*
-
+
+
-
+
+
-
V



out
*
V
ref
5X Boost
V
V
C
C
C
C
C
C
C
CC
SS
1N
2N
5P
3P
1P
2P
4P
,
where
SS
-
+
+
-
+
+
-
+
)
V
6X Boost
ref
SS
and V
V
V
C
C
C
C
C
C
C
CC
SS
1N
2N
5P
3P
1P
2P
4P
1
4 .
R
(R
-
+
-
+
+
-
+
V
+
1
SOLOMON
), and
+
-