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參數(shù)資料
| 型號： | NT7501H-BDT |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 33 X 100 RAM-Map LCD Controller/Driver |
| 中文描述： | 33 × 100 RAM的地圖LCD控制器/驅(qū)動器 |
| 文件頁數(shù)： | 14/38頁 |
| 文件大小： | 319K |
| 代理商： | NT7501H-BDT |
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NT7501
14
Voltage Regulator Circuit
The function of the internal voltage regulator circuits is to determine the liquid crystal operating voltage V
0,
by adjusting resistors
R
a
and R
b
, within the range V
0
< V
OUT
. VOUT is the operating voltage of the operational amplifier circuits shown in Figure 6.
Feedback gain control for initial LCD voltage. External resistors are connected between V
0
and V
R
, and between V
R
and V
SS
and these resistors are chosen to give the desired V
0
according to the following equation:
V
0
= (1 + R
b
/R
a
) X V
REG
+ R
b
X I
ref
TPS1
TPS0
Thermal Gradient (% /
°
C)
VREG (V)
0
0
-0.05 (Internal V
REG
used)
2.2
0
1
-0.2 (Internal V
REG
used)
2.45
1
0
0
V
DD
1
1
0
V
DD
Voltage Regulator Using the Electronic Volume Control Function
The Electronic Volume Control Function can adjust the intensity (brightness level) of the LCD screen by electronic control
command.
Software controls the 32 voltage levels of V
0
. This yields the following equation:
V
0
= (1+ R
b
/R
a
) X V
REG
+ R
b
X I
ref
Where I
ref
= 0 to 6.5
μ
A
±
40% depending on the 5-bit data set by the electronic control command.
V
REG
R
a
V
ss
V
out
R
b
V
0
I
ref
Figure 6.
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|---|---|
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