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參數(shù)資料
| 型號： | UPD16682W |
| 廠商： | NEC Corp. |
| 英文描述： | 1/65 DUTY LCD CONTROLLER/DRIVER WITH ON-CHIP RAM |
| 中文描述： | 1 / 65稅LCD控制器/驅(qū)動器，片內(nèi)RAM |
| 文件頁數(shù)： | 23/56頁 |
| 文件大?。?/td> | 435K |
| 代理商： | UPD16682W |
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Data Sheet S13368EJ3V0DS00
23
μ
PD16682
Rb/Ra is an on-chip resistance factor used for the V
LC1
voltage regulator. This factor can be controlled among
eight levels using the V
LC1
voltage regulator resistance factor set command. Table 10
5 lists reference values for
(1+Rb/Ra) which are set when 3-bit data is set to the V
LC1
voltage regulator resistance factor register.
Table 10
5. Reference Values for (1 + Rb/Ra)
Register
Reference Value
D
3
D
2
D
1
0
0
0
3.5
0
0
1
4.0
0
1
0
4.5
0
1
1
5.0
1
0
0
5.5
1
0
1
6.0
1
1
0
6.5
1
1
1
7.0
10.3.2 When using external resistor (not using on-chip resistor for V
LC1
voltage regulator)
Instead of using the on-chip resistor for the V
LC1
voltage regulator (IRS pin = L), resistors (Ra’ and Rb’) can be
added between V
SS
and V
R
and between V
R
and V
LC1
to set the LCD power supply voltage V
LC1
. In such cases, the
electronic volume function can be used to control the LCD power supply voltage V
LC1
using commands to regulate
the darkness of the LCD contents. The V
LC1
voltage can be determined using equation 10
2 as within the range of
V
LC1
< V
LCD
.
Equation 10
2.
EV
1
LC
V
)
'
Ra
'
Rb
1
V
+
=
The equation for determining V
EV
varies according to the product code (temperature gradient).
REG
EV
V
)
162
α
1
203
162
162
V
α
=
(-001 code, –0.05 % /
°
C)
REG
EV
V
)
162
α
1
178
162
V
=
(-002 code, –0.1 % /
°
C)
REG
EV
V
)
162
1
221
V
=
(-003 code, –0.15 % /
°
C)
REG
EV
V
)
162
1
V
α
=
(-004 code, 0 % /
°
C)
Ra'
Rb'
V
LC1
+
–
V
LC1
V
R
V
EV
(Constant voltage source + electronic volume)
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