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參數(shù)資料
| 型號： | UPD16680W |
| 廠商： | NEC Corp. |
| 英文描述： | 1/53, 1/40 DUTY, LCD CONTROLLER/DRIVER WITH BUILT-IN RAM |
| 中文描述： | 1 / 53，1 / 40的責任，LCD控制器/驅動，配有內存 |
| 文件頁數(shù)： | 11/44頁 |
| 文件大?。?/td> | 290K |
| 代理商： | UPD16680W |
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Data Sheet S12694EJ2V0DS00
11
μ
PD16680
5.2 LCD driving circuit
5.2.1 To use internal driving circuit, not to use D/A converter ( V
EXT
= L , DA
CHA
= L )
When to internal driving circuit is chosen, boosted voltage be used for power of internal operational amplifier
adjusting LCD driving voltage. To connect external resister R
1
, R
2
, and input reference voltage to AMP
IN(+)
pin. It is
possible to adjust LCD driving voltage of V
LC1
. If using thermistor to adjust LCD driving voltage according to the
temperature characteristic of LCD panel, we recommend connecting it with R
2
in parallel.
The value of V
LC1
can be computed by the following formula.
Equation 5-1
V
LC1
= AMP
IN
(+) = (1+ R
REF
Remark
R
2
′
=
Figure 5-2 When not using Internal power supply select or D/A converter
V
REF
to Internal driving circuit
D/A
Converter
AMP
IN(-)
AMP
out
V
LC1
R
2
R
1
R
th
AMP
IN(+)
DA
CHA
+
C
1
2
′
R
1
R
2
x R
th
R
2
+ R
th
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