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(C) When External Resistors are Used
(i.e. The V
Voltage Regulator Internal Resistors Are Not Used). (2)
5
When the external resistor described above are used, adding a variable resistor as well makes it possible to perform fine
adjustments on Ra' and Rb', to set the liquid crystal drive voltage V
function makes it possible to control the liquid crystal power supply voltage V
display brightness.
In the range where | V
5
(variable resistor) and R
=
V
1
5
=
1
[
Q
V
Ra'
Rb'
Setup example: When selecting Ta = 25°C and V
gradient = –0.05%/°C.
When the central value for the electronic volume register is set at (D5, D4, D3, D2, D1, D0) = (1, 0, 0, 0, 0, 0),
α =
31
= −
V
2 1
.
V
REG
so, according to equation C-1, when ∆ R
+
R
R
−
=
+
⋅
3
2
9
V
1
R
1
When ∆ R
= R
, in order to make V = –5 V,
2
2
R
−
=
+
⋅
3
5
V
1
+
R
R
1
2
Moreover, when the current flowing V
+
+
=
Ω
R
R
R
1 4
.
M
1
2
3
With this, according to equation C-2, C-3 and C-4,
=
Ω
R
264
k
1
=
Ω
R
211
k
2
=
Ω
R
925
k
3
At this time, the V
voltage variable range and notch width based on the electron volume function is as shown in Table
5
15.
Rev.2.1
| < | V
| the V
voltage can be calculated by equation C-1 below based on the R
OUT
5
settings, where R
can be subjected to fine adjustments (∆ R
3
2
+
−
∆
R
R
R
+
⋅
3
2
2
V
+ ∆
EV
R
R
1
2
+
− ∆
α
R
R
R
+
⋅
3
2
2
1
–
+ ∆
R
R
162
1
2
]
(
)
α
=
−
⋅
1
V
EV
162
REG
External
resistor R
1
∆R
External
2
resistor R
2
V
R
External
resistor R
3
5
= 0 Ω, in order to make V
2
31
(
)
−
⋅ −
1
2 1
.
162
(Equation C-2)
31
(
)
−
⋅ −
1
2 1
.
162
(Equation C-3)
and V
DD
(Equation C-4)
. In this case, the use of the electronic volume
5
⋅
V
REG
(Equation C-1)
V
(fixed voltage supply + electronic volume)
EV
+
–
Figure 15
= –5 to –9 V (using R
) for an S1D10607 model where the temperature
2
= –9 V,
5
is set to 5 µA,
5
EPSON
S1D10605 Series
by commands to adjust the liquid crystal
5
).
2
V
DD
V
5
and R
1
2
31
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