S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 139

• Manufacturer Part Number: S1D1
• Description: LCD Controller-driver With Built-in Character ROM
• Manufacturer: Epson Electronics America, Inc.

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 S1D15300 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.
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 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:
Ta=25 C
Rev.1.4
REF
5
5
5
range by use of the Electronic Volume Control.
Rb =
Ra using the Rb of Step 1) above.
Ra =
V
V
I
maximum voltage:
minimum voltages:
variable voltage range: 4 V
REF
REG
REG
current source which are constant during voltage variation.
R3 =
Ra =
V
V
= –3.2 A 40% (For 16 levels) I
REG
V
V
= –2.55V 0.20V (Type1)
= V
5
5
–6.5 A 40% (For 32 levels)
V
REG
max = (1+Rb/Ra)
min = V
5
Rb
5
variable voltage range
and I
V
SS
V
V
5
–1
= (1+625k/442k)
= –6.0V
= –6V + 625k
= –10.0V
max
REG
5
(V
variable voltage range
Rb
REF
DD
5
I
REF
max + Rb I
–1
basis) (Type2)
variation. Also, the contrast adjustment is
{V
| I
=
REF
5
= (1 + Rb/Ra)
V
register values (D4,D3,D2,D1,D0) =
(0,0,0,0,0))
V
register values (D4,D3,D2,D1,D0) =
(1,1,1,1,1))
32 levels
5
5
–2.55V
|
625k
V
= –6 V (Electronic volume control
= –10 V (Electronic volume control
–6V
(–6.5 A)
REG
REF
(–2.55V)
5
absolute value is determined
–1
REG
5
V
V
absolute value, determine
REF
=
REG
REG
V
reference voltage and
6.5 A Rb = 625K
4V
REG
= 0.023 A/ C
5
= –0.2%/˚C
= –0.00%/˚C
0.052 A/ C
variable voltage
5
}
voltage change
Ra = 462K
EPSON
According to the V
be as follows (if V
Ta=–10 C
Ta=–50 C
The margin must also be determined in the same procedure given
above by considering the V
calculation results show that the V
V
Volume Control depends on the I
value of 0.2 V/step is set, for example, the maximum variation range
of 0.12 to 0.28 V must be considered.
In case of Type 2, it so becomes that V
there is no temperature gradient. However, I
temperature characteristics as with Type 1.
Command Sequence when Built-in Power Supply is Turned
OFF
To turn off the built-in power supply, follow the command sequence
as shown below to turn it off after making the system into the standby
mode.
REG
and I
(V
V
V
V
V
Entire Displays ON
Built-in Power OFF
Static Indicator ON
5
5
5
5
DD
max = (1+Rb/Ra) V
min = V
max = (1+Rb/Ra) V
min = V
REF
V
-10V
Display OFF
) 0V
5
-5V
[V]
variation. The voltage setup width of the Electronic
= (1+625k/462k) (–2.55V)
= –6.42V
= –6.42V + 625k
= –11.63V
= (1+625k/462k) (–2.55V)
= –5.7V
= –5.7V + 625k
= –8.95V
5
DD
5
5
voltage and temperature change, equation
{1+(–0.2%/ C)
{1+(–0.2%/ C)
{–6.5 A+(0.052 A/ C)
{–6.5 A+(0.052 A/ C)
-20
max + Rb I
max + Rb I
S1D15300 Series V
= 0 V reference):
V
5
variable voltage range
REG
0
(32 levels)
Command ADh
Command AEh
Command A5h
REG
REG
and I
REF
REF
REF
5
Ta
center value is affected by the
20
variation. When the typical
(–10 C–25 C)}
(50 C–25 C)}
REF
REG
S1D15300 Series
variation. This margin
= V
5
40
REF
(–10 C–25 C)}
(50 C–25 C)}
(Ta=–10 C)
(Ta=–10 C)
(Ta=50 C)
(Ta=50 C)
SS
carries the same
(V
Power Save
Command
[¡C]
DD
60
basis) and
5–15
5
can