SED1565 EPSON [Epson Company], SED1565 Datasheet - Page 35

• Manufacturer Part Number: SED1565
• Description: Direct display of RAM data through the display data RAM
• Manufacturer: EPSON [Epson Company]

* The V
The Voltage Regulator Circuit
The step-up voltage generated at V
liquid crystal driver voltage V
regulator circuit.
Because the SED1565 Series chips have an internal
high-accuracy fixed voltage power supply with a 64-
level electronic volume function and internal resistors
for the V
without having to include high-accuracy voltage
regulator circuit components.
Moreover, in the SED1565 Series, three types of thermal
gradients have been prepared as V
approximately -0.05%/ C (2) approximately -0.2%/ C,
and (3) external input (supplied to the V
C1
C1
C1
C1
value.
+
+
+
4 x step-up voltage circuit
V
V
V
OUT
DD
SS2
5
SS2
4x step-up voltage relationships
= 0V
voltage regulator, systems can be constructed
= –3V
= 4 x V
voltage range must be set so that the V
V
V
CAP3–
CAP1+
CAP1–
CAP2–
CAP2+
SS2
OUT
SS2
= –12V
5
through the voltage
REG
OUT
RS
options: (1)
V
V
V
outputs the
C1
C1
C1
terminal).
OUT
DD
SS2
3x step-up voltage relationships
+
+
+
3 x step-up voltage circuit
= 0V
= –3V
= 3 x V
OUT
EPSON
Figure 7
SS2
terminal voltage does not exceed the absolute maximum rated
= –9V
V
V
CAP3–
CAP1+
CAP1–
CAP2–
CAP2+
SS2
OUT
(A) When the V
Through the use of the V
resistors and the electronic volume function the liquid
crystal power supply voltage V
commands alone (without adding any external resistors),
making it possible to adjust the liquid crystal display
brightness. The V
equation A-1 over the range where | V
Resistors Are Used
V
V
V
OUT
DD
SS2
2x step-up voltage relationships
5
5
= 0V
Voltage Regulator Internal
= –5V
= 2 x V
voltage can be calculated using
C1
C1
5
+
+
SS2
2 x step-up voltage circuit
voltage regulator internal
= –10V
OPEN
5
can be controlled by
SED1565 Series
5
V
V
CAP3–
CAP1+
CAP1–
CAP2–
CAP2+
| < | V
SS2
OUT
OUT
8–33
|.