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参数资料
| 型号： | SSD1815T2R |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SEMICONDUCTOR TECHNICAL DATA |
| 中文描述： | 半导体技术数据 |
| 文件页数： | 11/35页 |
| 文件大小： | 856K |
| 代理商： | SSD1815T2R |
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S OLOMON
SSD1815
11
REV 1.5
03/2000
LCD Driving Voltage Generator and Regulator
This module generates the LCD voltage required for display driv-
ing output. It takes a single supply input and generate necessary volt-
age levels. This block consists of:
1. 2X, 3X and 4X DC-DC voltage converter
The built-in DC-DC voltage converter is use to generate large neg-
ative LCD driving voltage with reference to V
DD
from the voltage
input (V
SS1
). For SSD1815, it is possible to produce 2X, 3X or 4X
boosting from the protential different between V
SS1
- V
DD
.
Detail configurations of the DC-DC converter for different boosting
multiples are given in Figure 6 at the right.
2. Voltage Regulator (Voltages referenced to V
DD
)
The feedback gain control for LCD driving contrast curves can be
selected by IRS pin to either internal (IRS pin = H) or external (IRS
pin = L).
For internal resistor network is enabled, there are eight setting can
be set by software.
If external control is selected, external resistors are required to be
connected between V
DD
and V
F
(R1), and between V
F
and V
L6
(R2).
3. Contrast Control (Voltages referenced to V
DD
)
Software control of the 64 contrast voltage levels at each voltage
regulator feedback gain. The equation of calculating the LCD driv-
ing voltage is given as:
where
and
4. Bias Divider
Divide the regulator output to give the LCD driving voltages (V
L2
-
V
L5
). 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
Software control of 1/7 and 1/9 bias ratio to match the characteris-
tic of LCD panel. In addition, 1/4, 1/5, 1/6 and 1/8 bias ratios are
also software selectable using the extended command for any
mux application.
6. Self adjust temperature compensation circuitry
This block provides 4 different compensation settings to satisfy
various liquid crystal temperature gradings by software control.
Default temperature coefficient (TC) setting is TC0.
)
1
)
(
(
)
1
6
R
V
V
R
V
V
V
Contrast
b
Gain
V
V
SS
DD
ref
DD
L
BE
ref
+
+
=
+
=
Int. Reg. Resistor
Ratio Setting
0
1
2
3
4
5
6
7
Ext.
Resistor
Gain
-3.29
-3.76
-4.29
-4.82
-5.39
-5.76
-6.40
-6.95 -(1+R
2
/R
1
)
β
92.59 91.86 91.12 90.40 89.67 89.18 88.29 87.49
96.68
TC
0
(-0.01%/
°
C)
0.025
0.72
2
(-0.10%/
°
C)
0.523
0.423
4
(-0.18%/
°
C)
0.520
0.272
7
(-0.25%/
°
C)
0.517
0.121
V
BE
R
SSD1815
C
3N
C
1P
C
1N
C
2P
C
2N
V
EE
Remarks:
1. C1 = 0.47 - 1.0uF
2. Boosting input from V
SS1
.
3. V
SS1
should be lower potential than or equal to V
SS
4. All voltages are referenced to V
DD
V
SS1
+
C1
C1
+
SSD1815
C
3N
C
1P
C
1N
C
2P
C
2N
V
EE
V
SS1
+
C1
C1
+
C1
+
SSD1815
C
3N
C
1P
C
1N
C
2P
C
2N
V
EE
V
SS1
+
C1
C1
+
C1
+
C1
+
2X Boosting Configuration
3X Boosting Configuration
4X Boosting Configuration
Figure 6 - Configurations for DC-DC Converter
相关PDF资料 |
PDF描述 |
|---|---|
| SSD1815T3R | SEMICONDUCTOR TECHNICAL DATA |
| SSD1815TR | SEMICONDUCTOR TECHNICAL DATA |
| SSD1815Z | SEMICONDUCTOR TECHNICAL DATA |
| SSD1818A | LCD Segment / Common Driver with Controller |
| SSD1818ATR1 | LCD Segment / Common Driver with Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SSD1815T3R | 制造商:未知厂家 制造商全称:未知厂家 功能描述:SEMICONDUCTOR TECHNICAL DATA |
| SSD1815TR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:SEMICONDUCTOR TECHNICAL DATA |
| SSD1815Z | 制造商:未知厂家 制造商全称:未知厂家 功能描述:SEMICONDUCTOR TECHNICAL DATA |
| SSD1818 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:LCD Segment / Common Driver with Controller |
| SSD1818A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:LCD Segment / Common Driver with Controller |
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