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參數(shù)資料
| 型號： | UPD16702 |
| 英文描述： | UPD16702 Data Sheet | Data Sheet[09/2001] |
| 中文描述： | UPD16702數(shù)據(jù)表|數(shù)據(jù)表[09/2001] |
| 文件頁數(shù)： | 6/20頁 |
| 文件大小： | 157K |
| 代理商： | UPD16702 |
Data Sheet S15859EJ1V0DS
6
μ
PD160040
5. RELATIONSHIP BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE
The
μ
PD160040 incorporates a 8-bit D/A converter whose odd output pins and even output pins output respectively
gray scale voltages of differing polarity with respect to the LCD’s counter electrode voltage. The D/A converter
consists of ladder resistors and switches.
The ladder resistors (r
0
to r
253
) are designed so that the ratio of LCD panel (
γ
-compensated voltages to V
0
’-V
255
’ and
V
0
”-V
255
” is almost equivalent as shown in Figure 5
2. For the 2 sets of eight
γ
-compensated power supplies, V
0
-V
7
and V
8
-V
15
, respectively, input gray scale voltages of the same polarity with respect to the 0.5 V
DD2
.
Figure 5
1 shows the relationship between the driving voltages such as liquid-crystal driving voltages V
DD2
, V
SS2
and
0.5 V
DD2
, and
γ
-corrected voltages V
0
to V
15
and the input data. Be sure to maintain the voltage relationships below.
V
DD2
– 0.2 V
≥
V
0
> V
1
> V
2
> V
3
> V
4
> V
5
> V
6
> V
7
≥
0.5 V
DD2
+ 0.5 V
0.5 V
DD2
– 0.5 V
≥
V
8
> V
9
> V
10
> V
11
> V
12
> V
13
> V
14
> V
15
≥
V
SS2
+ 0.2 V
Also, V
6
-V
7
and V
8
-V
9
are left open in the IC. Be sure to input the gray scale level power supply at a constant level
to the all pins, as V
0
-V
15
.
Figures 5
3 shows the relationship between the input data and the output voltage.
Figure 5
1. Relationship between Input Data and
γ
-corrected Power Supplies
V
DD2
V
0
V
1
V
2
V
3
V
4
V
5
V
6
V
7
0.5 V
DD2
V
8
V
9
V
10
V
11
V
12
V
13
V
14
V
15
V
SS2
00 01
20
40
80
C0
F0
FF
Input Data (HEX)
0.2 V
0.2 V
0.5 V
0.5 V
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