S1D10605 Epson Electronics America, Inc., S1D10605 Datasheet - Page 229

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

S1D15600/601/602 Series
The voltage regulator has a temperature gradient of
approximately -0.2%/ C as the V
another 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.
In case of Type 2, similarly preset R1, R2 and R3 on the
basis of V
Voltage regulator 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
one of 32-state voltages.
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 boosting circuit is off, the voltage must be
supplied from V
When the Electronic Volume Control Function is used,
the V
V
The increased V
current source of the IC. (For 32 voltage levels, I
I
The minimum setup voltage of the V
determined 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
7–34
REF
5
voltage range by use of the Electronic Volume Control.
Rb =
value, determine Ra using the Rb of Step 1) above.
Ra =
= (1 +
/31)
5
voltage can be expressed as follows:
V
V
REG
Rb
Ra
V
REG
5
Rb
5
variable voltage range
Variable voltage range
) V
= V
–1
OUT
5
REG
SS
voltage is controlled by use of I
I
.
REF
terminal.
+ Rb
{V
5
5
LCD driver voltage can be
= (1 + Rb/Ra)
I
REF
REG
5
LCD driver voltage.
........................
voltage. To obtain
5
absolute value is
V
5
5
absolute
REG
variable
REF
}
REF
5
=
EPSON
The S1D15206 series have the built-in V
voltage and I
during voltage variation. 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.
Ra is a variable resistor that is used to correct the V
voltage change due to V
contrast adjustment is 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 the Set Electronic Volume
Control Register command.
Setup example of constants when Electronic Volume
Control Function is used:
V
V
V
Variable voltage levels:
1) Determining the Rb:
2) Determining the Ra:
5
5
5
V
V
V
V
V
I
I
REF
REF
maximum voltage:
minimum voltages:
variable voltage range: 4 V
REG
REG
REG
REG
REG
= –3.2 A 40% (For 16 levels)
= 0.023 A/ C
R3 =
Ra =
= –2.5V 0.15V } Type1
= –0.2%/˚C
= V
= 0.00%/˚C
= –0.2%/ C
–6.5 A 40% (For 32 levels)
0.052 A/ C
SS
V
REF
V
V
5
max
REG
5
variable voltage range
Rb
current source which are constant
}Type2
–1
REG
| I
REF
=
and I
V
volume control register
values (D4,D3,D2,D1,D0)
= (0,0,0,0,0))
V
volume control register
values (D4,D3,D2,D1,D0)
= (1,1,1,1,1))
32 levels
625K
–2.55V
5
5
|
–6V
REF
= –10 V (Electronic
= –6 V (Electronic
variation. Also, the
–1
REG
Rb = 625K
Ra = 462K
=
6.5 A
reference
Rev. 4.6
4V
5