S1D15715 Epson Electronics America, Inc., S1D15715 Datasheet - Page 29

• Manufacturer Part Number: S1D15715
• Description: Liquid Crystal Display =lcd Driver
• Manufacturer: Epson Electronics America, Inc.

* The Capacitance depends on the load of the LCD panel to be driven. Set a value that LCD driver voltage
6.6.2 Voltage regulator circuit
The boosting voltage generated at the V
regulator circuit.
Because the S1D15715 Series has the high-accuracy constant voltage source, the 32-level electronic volume
function and the internal resistor for the V
high-accuracy voltage regulator circuit without external component.
(A) When using the V
Rev.1.0
may be stable (reference value = 1.0 to 4.7µF).
V
V
V
OUT
DD
SS
Potential Relationship in
The internal resistor for the V
control of the liquid crystal voltage V
resistor, and allows for the adjustment of the liquid crystal display contrast.
The V
V
Table 10.
= 0V
= 3.0V
REG
= 9.0V
= 3 × V
Triple boosting
Triple boosting
0
represents the constant voltage source within an IC. Its value at T
voltage can be calculated using the following expression within the range of |V
+
+
+
DD
V
0
0
=(1+Rb/Ra)･V
=(1+ Rb/Ra)･(1-α/200)･V
V
V
CAP1-
CAP1+
CAP2-
CAP2+
voltage regulator internal resistor
[V
S1D15715, S1D15716, S1D15717
DD
OUT
EV
=(1-α/200)･V
0
voltage regulator resistor and the electronic volume function allows for the
Model
EV
V
V
V
OUT
OUT
DD
SS
Potential Relationship in
0
= 0V
= 5.0V
0
REG
through commands only, without the need of adding an external
= 2 × V
= 10.0V
pin outputs liquid crystal drive voltage V
voltage regulator (= V
Double boosting
OPEN
]
Double boosting
Table 10
REG
+
+
EPSON
Fig.9
DD
V
1.2V
REG
V
V
CAP1-
CAP1+
CAP2-
CAP2+
S1D15715 Series Technical Manual
DD
OUT
(Expression A-1)
Thermal Gradient
0
-resistor), it is possible to construct a
-0.05%/°C
a
=25°C is constant as shown in
0
through the voltage
0
|<|V
OUT
|.
23