S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 99

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

Setup example of constants when Electronic Volume Control
Function is used:
(1) Determining the Rb:
(2) Determining the Ra:
According to the V
be as follows (if V
Command sequence for built-in power circuit startup
The built-in power circuit must follow the command sequence given below.
* When the Set Power Control command is issued, the V
Any other command can be entered during this period.
Rev.3.5
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))
V
Variable voltage levels: 32 levels
If Ta = 25 C:
If Ta = –10 C:
Rb =
Ra =
5
5
5
maximum voltage: V
minimum voltages: V
variable voltage range: 2.4 V
V
V
V
V
5
5
5
5
V
V
max = (1 + Rb/Ra) · V
min = V
max = (1 + Rb/Ra) · V
min = V
V
5
5
REG
max
variable voltage range
Rb
• To start the built-in power
= (1 + 1 M /1 M ) (–3.1 V)
= –6.2 V
= –6.2 V + 1 M
= –8.6 V
= (1 + 1 M /1M ) (–3.1 V) {1 + (–0.17%/ C)
= –6.57 V
= –6.57 V + 1M
= –8.20 V
circuit when logic units are
being powered:
5
(–10 C – 25 C)}
DD
–1
voltage and temperature change, equation
5
5
(–10 C – 25 C)}
|I
Display turns ON.
= 0 V reference):
max + Rb · I
max + Rb · I
REF
Hardware reset
(SR1=SR2='0')
Setup of power
=
|
–6.2 V
–3.1 V
control
1.0 M
5
5
= –6.2 V (Electronic volume control
= –8.6 V (Electronic volume control
*After approx. 200 msec
–1
REG
REG
REF
REF
(–2.4 A)
{–2.4 A + (0.022 A/ C)
=
2.4 A
2.4 V
Rb = 1.0 M
Ra = 1.0 M
DD
level signal is output at both COM and SEG terminals for approximately 200 msec.
5
can
EPSON
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.
When the V
is no temperature gradient. However, I
temperature characteristics as with V
Voltage generator for LCD (Voltage fullower)
The V
and V
potentials are then converted in impedance by voltage follower, and
sent to LCD driver circuit.
Because the LCD drive voltage has been fixed to each model, the
display quality may drop in specific duty selected by Select Duty
command. If it occurs, use an external power supply.
Subsection gives wiring examples and reference parts list when on-
chip power supply is used and when not used.
• To start the built-in power
REG
Release the Power Save
circuit after release of Power
Save mode:
If Ta = 50 C:
OFF or display is ON.)
mode. (Static drive is
5
and I
4
Display turns ON.
potential is divided using resistance within IC and V
V
V
potentials are generated for LCD panel drive. These
Setup of power
5
5
REF
max = (1 + Rb/Ra) · V
min = V
REG
control
S1D15206
S1D15208
variation. The voltage setup width of the Electronic
Model
= (1 + 1 M /1 M ) (–3.1 V) {1 + (–0.17%/ C)
= –5.94 V
= –5.94 V + 1M
= –8.89 V
= Type 2, it so becomes that V
*After approx. 200 msec
(–50 C – 25 C)}
5
(50 C – 25 C)}
max + Rb · I
REG
LCD drive voltage
and I
1/5 of bias voltage
1/7 of bias voltage
REF
REG
REF
5
center value is affected by the
REG
{–2.4 A + (0.022 A/ C)
variation. When the typical
REF
S1D15206 Series
= Type 1.
variation. This margin
REF
REG
carries the same
= V
SS
and there
1
, V
4–15
2
, V
3