S1D10605 Epson Electronics America, Inc., S1D10605 Datasheet - Page 98

• Manufacturer Part Number: S1D10605
• Description: S1d15000 Series Lcd Driver With Ram
• Manufacturer: Epson Electronics America, Inc.

S1D15206 Series
Voltage regulator
The boosting voltage occurring at V
V
where, V
constant (V
(V
I
Control Function, and I
register (32-state) has (D4,D3,D2,D1,D0)=(1,1,1,1,1).
To adjust the V
V
resistors and R2 variable resistor is recommended for fine-adjustment
of V
Setup example of resistors R1, R2 and R3:
The voltage regulator circuit has a temperature gradient of
approximately –0.17%/ C as the V
temperature gradient, use the Electronic Volume Control Function
for software processing using the MPU.
As the VR pin has a high input impedance, the shielded and short
lines must be protected from a noise interference.
When the V
of V
Voltage regulator circuit using the Electronic Volume
Control Function
The Electronic Volume Control Function can adjust the intensity
(brightness level) of liquid crystal display (LCD) screen by command
control of V
This function sets five-bit data in the electronic volume control
register, and the V
voltages.
4–14
REF
5
R
REG
, V
voltage can be determined by the following equation when resistors Ra and Rb (R1, R2 and R3) are adjusted within the range of |V
When the Electronic Volume Control Function is OFF (electronic
volume control register values are (D4,D3,D2,D1,D0)
=(0,0,0,0,0)):
V
(As I
From equations
5
REG
is the voltage regulation current of the Electronic Volume
5
• R1 + R2 + R3 = 6.0 M ............................
• Variable voltage range by R2: –6.2 to –9.3 V
DD
voltage.
=Type2)
= (1 +
(Determined by the current passing between V
(Determined by the LCD characteristics)
REF
= V
and V
REG
To obtain V
To obtain V
REG
REG
R2 = 0 , V
R2 = R2, V
5
SS
= 0A)
LCD driver voltage.
R3 + R2 – R2
is the constant voltage source of the IC, and it is
.
5
5
= Type 2, similarly preset R1, R2 and R3 on the basis
.
= .
as shown. A combination of R1 and R3 constant
R1 + R2
output voltage, insert a variable resistor between
R2 + R3 = 2 · R1 .........................
R1 + R2 = 1 · R1 .........................
–3.1 V). (V
5
2
LCD driver voltage can be one of 32-state
V
,
5
5
REF
5
REG
REG
3
= –9.3 V, from equation (1):
= –6.2 V, from equation (1):
=(1+
=(1+
and
+I
.
= .
= –3.1 V
2.4 A if the electronic volume control
= –3.1 V
REF
REG
Rb
Ra
R3+R2– R2
) · V
4
:
R1+ R2
· (R3+R2– R2)
) · V
=Type1) V
REG
REG
OUT
REG
voltage. To obtain another
R1 = 2.0 M
R2 = 1.0 M
R3 = 3.0 M
.................
is sent to the voltage regulator and the V
+I
REF
) · V
REG
· Rb
=V
REG
SS
1
2
3
4
(V
DD
DD
and V5)
Ra
Rb
basis)
EPSON
R1
R2
R3
To use the Electronic Volume Control Function, issue the Set Power
Control command to simultaneously operate both the voltage
regulator circuit and voltage follower circuit.
Also, when the voltage tripler off, the voltage must be supplied from
V
When the Electronic Volume Control Function is used, the V
voltage can be expressed as follows:
The increased V
of the IC. (For 32 voltage levels, I
The minimum setup voltage of the V
by the ratio of external Ra and Rb, and the increased voltage by the
Electronic Volume Control Function is determined by resistor Rb.
Therefore, the resistors must be set as follows:
(1) Determine Rb resistor depending on the V
(2) To obtain the minimum voltage of the V
The S1D15206 series have the built-in V
I
However, they may change due to the variation occurring in IC
manufacturing and due to the temperature change as shown below.
Consider such variation and temperature change, and set the Ra and
Rb appropriate to the LCD used.
V
V
I
I
Ra is a variable resistor that is used to correct the V
due to V
recommended for each IC chip.
Before adjusting the LCD screen contrast, set the electronic volume
control register values to (D4,D3,D2,D1,D0)=(1,0,0,0,0) or
(0,1,1,1,1) first.
When not using the Electronic Volume Control Function, set the
register values to (D4,D3,D2,D1,D0)=(0,0,0,0,0) by sending the
RES signal or by issuing the Set Electronic Volume Control Register
command.
REF
REF
REF
OUT
REG
REG
UR
V
range by use of the Electronic Volume Control.
Rb =
determine Ra using the Rb of Step (1) above.
Ra =
= –1.2 A
= –2.4 A
current source which are constant during voltage variation.
5
=–3.1V 0.4V (Type1)
=V
terminal.
5
= (1 +
liquid crystal display (LCD) drive voltage is output. This
REG
SS
R2
I
Voltage regulation
current
V
V
REF
V
(V
5
V
REG
and I
REG
variable voltage range
Rb
Ra
5
DD
Rb
5
voltage is controlled by use of I
40% (For 16 levels)
40% (For 32 levels)
basis) (Type2)
) · V
REF
–1
I
REF
+
-
variation. Also, the contrast adjustment is
REG
(Variable voltage range)
+ I
REF
[V
5
· Rb ..................
= (1 + Rb/Ra) · V
REF
5
V
V
absolute value is determined
REG
REG
=I
REG
I
I
REF
REF
REF
=–0.17%/˚C
=–0.00%/˚C
V
V
reference voltage and
/31)
DD
5
= 0.011 A/ C
= 0.022 A/ C
REF
5
5
variable voltage
5
absolute value,
voltage change
5
current source
REG
5
Rev.3.5
|<|V
]
OUT
|.
5