S1D12200 Epson Electronics America, Inc., S1D12200 Datasheet - Page 204

• Manufacturer Part Number: S1D12200
• Description: S1d12000 Series Lcd Driver Ic Technical Manual Technical Manual
• Manufacturer: Epson Electronics America, Inc.

S1D12400 Series
Voltage regulating circuit
The boosting voltage generated at V
liquid crystal drive voltage of V
regulating circuit.
The S1D12400 series is provided with a high-precision
constant-voltage source, a 32-step electronic volume
function, and a V
permits constructing a high-precision voltage regulating
[When using an external resistor (No use of V
The V
| V
[R1, R2 and R3 setup example]
• R1 + R2 + R3 = 1.2 M (Determined by the current
• Minimum voltage of V
• Variable voltage range by R2: –4 to –6 V (Determined
• When the electronic volume register is set to (0, 0, 0,
6–16
V
0
value I
crystal characteristic)
by the liquid crystal characteristic)
0, 0), V
value can be calculated by the above conditions and
expression 1 as follows.
5
| < | V
5 A)
5
voltage can be obtained from the following expression 1 by adjusting resistors Ra and Rb within the range of
05
R
Ra
EV
OUT
1
flowing between V
= 2.0 V (TYP). Accordingly, each resistor
|.
5
voltage regulating resistor. This
V
R
R
2
5
V
: –6 V (Determined by liquid
EV
+
-
(constant-voltage source
DD
R
Rb
3
5
and V
+ electronic volume)
through the voltage
OUT
V
5
. Supposing I
DD
is output as a
5
voltage regulating built-in resistor is set by command.)]
V
5
05
EPSON
circuit with a small quantity of parts. The voltage
regulating circuit outputs V
gradient of about –0.05%.
As the V
an external resistor can be selected by command as a
matter of configuration.
In this case, V
source in the IC and by setting the electronic volume.
When the electronic volume value is (00000), V
2.0 V, being constant.
For voltage adjustment of V
resistor among V
adjustment of V
fixed resistors R1 and R3 with variable resistor R2.
Note 1: The input impedance of the V
R1 = 400 K
R2 = 200 K
R3 = 600 K
V
it is necessary to take a proper measure against
noise for short wiring and shielding wiring.
5
5
voltage regulating resistor, a built-in resistor or
= (1 + R
EV
5
is determined by the constant-voltage
output, it is recommended to combine
R
R
, V
b
a
) • V
DD
, and V
EV
5
EV
output, connect a variable
..............................
and has a temperature
5
. For fine voltage
R
pin is high, so
1
Rev. 2.1
REG
· = ·