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S1D10605 Series
(B) When an External Resistance is Used
(i.e., The V
Voltage Regulator Internal Resistors Are Not Used) (1)
5
The liquid crystal power supply voltage V
terminal = LOW) by adding resistors Ra' and Rb' between V
this is done, the use of the electronic volume function makes it possible to adjust the brightness of the liquid crystal
display by controlling the liquid crystal power supply voltage V
In the range where | V
| < | V
5
Ra' and Rb'.
=
V
5
=
[
Q
External
resistor Ra'
External
resistor Rb'
Setup example: When selecting Ta = 25°C and V
= –0.05%/°C.
When the central value of the electron volume register is (D5, D4, D3, D2, D1, D0) = (1, 0, 0, 0, 0, 0), then α = 31 and
V
= –2.1 V so, according to equation B-1,
REG
Rb
'
=
+
⋅
V
1
1
5
Ra
'
Rb
'
−
=
+
⋅
11
V
1
1
Ra
'
Moreover, when the value of the current running through Ra' and Rb' is set to 5 µA,
+
= 1 4 Ω
Ra
'
Rb
'
.
M
Consequently, by equations B-2 and B-3,
Rb
'
=
3 12
.
Ra
'
=
Ω
Ra
'
340
k
=
Ω
Rb
'
1060
k
At this time, the V
voltage variable range and notch width, based on the electron volume function, is as given in Table
5
14.
V
5
Variable Range
Notch width
30
can also be set without using the V
5
|, the V
voltage can be calculated using equation B-1 based on the external resistances
OUT
5
Rb
'
+
⋅
1
V
EV
Ra
'
α
Rb
'
+
⋅
⋅
1
1
–
V
REG
Ra
'
162
]
(
)
α
=
−
⋅
V
1
V
EV
162
REG
V
EV
+
–
= –7 V for an S1D10607 Series model where the temperature gradient
5
α
−
⋅
V
REG
162
31
(
)
−
⋅ −
2 1
.
(Equation B-2)
162
(Equation B-3)
Min.
–8.6 (63 levels)
and V
, and between V
DD
R
through commands.
5
(Equation B-1)
(fixed voltage power supply + electronic volume)
Figure 14
Table 14
Typ.
–7.0 (central value) –5.3 (0 level)
52
EPSON
voltage regulator internal resistors (IRS
5
and V
, respectively. When
R
5
V
DD
V
5
Max.
Units
[V]
[mV]
Rev.2.1
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