S1D15605 Epson Company, S1D15605 Datasheet - Page 44

• Manufacturer Part Number: S1D15605
• Description: Single-chip dot matrix liquid crystal display drivers
• Manufacturer: Epson Company

S1D15605 Series
(B) When an External Resistance is Used
The liquid crystal power supply voltage V
set without using the V
resistors (IRS terminal = LOW) by adding resistors Ra’
and Rb’ between V
Setup example: When selecting Ta = 25 C and V
7 V for an S1D15607 Series model where the temperature
gradient = –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
= 31 and V
Moreover, when the value of the current running through
Ra’ and Rb’ is set to 5 A,
8–42
Ra
(i.e., The V5 Voltage Regulator Internal
Resistors Are Not Used) (1)
11
'
V
V
V
Variable Range
Notch width
Rb
5
5
REG
'
1
1
. 1 4
= –2.1 V so, according to equation B-1,
M
Rb
Ra
Rb
Ra
DD
External
resistor Ra'
External
resistor Rb'
'
'
'
'
V
5
and V
Q
1
1
5
V
1
1
162
162
EV
31
voltage regulator internal
R
Rb
Ra
Rb
Ra
, and between V
Min.
–8.6 (63 levels)
'
'
'
'
V
1
REG
2 1
V
.
1
EV
162
–
162
(Equation B-2)
(Equation B-3)
V
5
REG
can also be
V
R
REG
V
and V
EV
+
–
5
(fixed voltage power supply + electronic volume)
= –
Figure 20
5
Table 14
EPSON
Typ.
–7.0 (central value) –5.3 (0 level)
52
,
( Equation B-1)
respectively. When 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
be calculated using equation B-1 based on the external
resistances Ra’ and Rb’.
Consequently, by equations B-2 and B-3,
At this time, the V
width, based on the electron volume function, is as
given in Table 14.
Rb
Ra
Ra
Rb
'
'
'
'
1060
3 12
340
.
Max.
k
k
5
V
V
voltage variable range and notch
5
DD
5
| < | V
OUT
5
through commands.
|, the V
Units
[V]
[mV]
5
voltage can
Rev. 2.4a