Specifications

S1D15300 Series
Rev.1.4 EPSON 5–15
The minimum setup voltage of the V
5
absolute value is 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
5
variable voltage
range by use of the Electronic Volume Control.
Rb =
V
5
variable voltage range
I
REF
2) To obtain the minimum voltage of the V
5
absolute value, determine
Ra using the Rb of Step 1) above.
Ra =
Rb
V
5
–1
{V
5
= (1 + Rb/Ra) × V
REG
}
V
REG
The S1D15300 series have the built-in V
REG
reference voltage and
I
REF
current source which are constant 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.
V
REG
= –2.55V±0.20V (Type1) V
REG
= –0.2%/˚C
V
REG
= V
SS
(V
DD
basis) (Type2) V
REG
= –0.00%/˚C
I
REF
= –3.2µA±40% (For 16 levels) I
REF
= 0.023µA/°C
–6.5µA±40% (For 32 levels) 0.052µA/°C
Ra is a variable resistor that is used to correct the V
5
voltage change
due to V
REG
and I
REF
variation. Also, the 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
5
maximum voltage: V
5
= –6 V (Electronic volume control
register values (D4,D3,D2,D1,D0) =
(0,0,0,0,0))
V
5
minimum voltages: V
5
= –10 V (Electronic volume control
register values (D4,D3,D2,D1,D0) =
(1,1,1,1,1))
V
5
variable voltage range: 4 V
Variable voltage levels: 32 levels
1) Determining the Rb:
R3 =
V
5
variable voltage range
=
4V
| I
REF
| 6.5µA Rb = 625KΩ
2) Determining the Ra:
Ra =
Rb
=
625kΩ
V
5
max
–1
–6V
–1
V
REG
–2.55V Ra = 462KΩ
Ta=25°C
V
5
max = (1+Rb/Ra) × V
REG
= (1+625k/442k) × (–2.55V)
= –6.0V
V
5
min = V
5
max + Rb × I
REF
= –6V + 625k × (–6.5µA)
= –10.0V
S1D15300 Series V5
[V]
-10V
-5V
-20 0 20 40 60
Ta [¡C]
V5 variable voltage range
(32 levels)
V
5
(VDD) 0V
According to the V
5
voltage and temperature change, equation
5
can
be as follows (if V
DD
= 0 V reference):
Ta=–10°C
V
5
max = (1+Rb/Ra) × V
REG
(Ta=–10°C)
= (1+625k/462k) × (–2.55V)
× {1+(–0.2%/°C) × (–10°C–25°C)}
= –6.42V
V
5
min = V
5
max + Rb × I
REF
(Ta=–10°C)
= –6.42V + 625k
× {–6.5µA+(0.052µA/°C) × (–10°C–25°C)}
= –11.63V
Ta=–50°C
V
5
max = (1+Rb/Ra) × V
REG
(Ta=50°C)
= (1+625k/462k) × (–2.55V)
× {1+(–0.2%/°C) × (50°C–25°C)}
= –5.7V
V
5
min = V
5
max + Rb × I
REF
(Ta=50°C)
= –5.7V + 625k
× {–6.5µA+(0.052µA/°C) × (50°C–25°C)}
= –8.95V
The margin must also be determined in the same procedure given
above by considering the V
REG
and I
REF
variation. This margin
calculation results show that the V
5
center value is affected by the
V
REG
and I
REF
variation. The voltage setup width of the Electronic
Volume Control depends on the I
REF
variation. When the typical
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
REG
= V
SS
(V
DD
basis) and
there is no temperature gradient. However, I
REF
carries the same
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.
Built-in Power OFF
Static Indicator ON
Display OFF
Command ADh
Command A5h
Command AEh
Power Save
Command
Entire Displays ON