ST7565V Sitronix Technology, ST7565V Datasheet - Page 36

• Manufacturer Part Number: ST7565V
• Description: 65 x 132 Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

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ST7565V
(B) When an External Resistance is Used (The V
The liquid crystal power supply voltage V
without using the V
terminal = “L”) by adding resistors Ra’ and Rb’ between V
and V
done, the use of the electronic volume function makes it
possible to adjust the brightness of the liquid crystal display
Setup example: When selecting Ta = 25° C and V
ST7565V 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 α = 31 and
V
Moreover, when the value of the current running through
Ra’ and Rb’ is set to 5 uA,
Ra’ + Rb’ = 1.4M
Consequently, by equations B-2 and B-3,
Ver 1.5b
-7V
REG
V
5
= –2.1V so, according to equation B-1,
R
=
=
, and between V
(
(
V
Variable Range
Notch width
1
1
5
+
+
V
External
resistor Ra'
External
resistor Rb'
5
Rb'
Ra'
Rb'
Ra'
[
=
=
5
∵ V
(
(
voltage regulator internal resistors (IRS
)
)
1
1
+
+
R
EV
and V
Rb'
Ra'
Rb'
Ra'
(
(
=
1 -
1 -
)
)
5
(
Min
–8.6 (63 levels)
, respectively. When this is
1 -
162
162
α
31
(
V
1 -
162
α
EV
)
)
5
)
162
(Equation B-3)
α
(-2.1)
can also be set
V
REG
V
V
)
REG
EV
5
= –7 V for
(fixed voltage power supply+electronic volume)
V
5
]
Voltage Regulator Internal Resistors Are Not Used) (1)
REG
DD
Typ
–7.0 (central value)
Table 14
Figure 11
52
36/72
by controlling the liquid crystal power supply voltage V
through commands.
In the range where | V
calculated using equation B-1 based on the external
resistances Ra’ and Rb’.
At this time, the V
width, based on the electron volume function, is as
given in Table 14.
Rb'
Ra'
Ra' = 340kΩ
Rb' = 1060kΩ
=
3.12
Max
–5.3 (0 level)
5
voltage variable range and notch
5
| < | V
OUT
|, the V
V
Units
[mV]
[V]
V
DD
5
5
voltage can be
2009/09/14
5