S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 392

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

Rev. 3.1a
In this case, Table 6-15 lists the V
• When using the V
• The V
• Since the V
Liquid crystal voltage generator circuit
The V
the V
crystal drive.
Further, the V
converted by the voltage follower and supplied to the
liquid crystal drive circuit.
Using the bias set command allows you to select a
desi re d bi a s r a tio f r o m 1 / 9 o r 1 /7 f o r t h e
S1D15705
and S1D15708
High power mode
The power supply circuit incorporated in the S1D15705
series has the ultra-low power consumption (normal
mode: HPM=HIGH). Therefore the display quality
adjusting circuit and voltage follower circuit are operated together needs to be set using the power control set
command. Also when the boosting circuit is OFF, the voltage needs to be applied from V
when using the V
1
5
, V
voltage is resistor-split within an IC and generates
R
2
, V
*****
pin is valid only when the V
V
Variable range
Pitch width
3
1
5
*****
R
, and V
, V
Procedure
Step1
Step2
pin has high input impedance, noise must be taken into consideration such as for short and shielded lines.
2
, V
and 1/6 or 1/5 for the S1D15707
5
5
3
4
voltage adjusting built-in resistor or electronic control function, the state where at least the voltage
, and V
.
voltage adjusting built-in resistor (IRS pin=HIGH).
potentials required for the liquid
Turning off the built
(Command, state)
-in power supply
4
Power save
Description
potentials are impedance-
–8.7
Min.
5
voltage variable range and pitch width using the electronic control function.
5
voltage adjusting built-in resistor (IRS pin=LOW). Set the V
to
*****
D7
1
D6
0
Command address
Table 15
EPSON
Fig. 13
D5
Typ.
–7.0
1
53
D4
0
may be deteriorated in large load liquid crystal or
panels. In this case, the display quality can be improved
by setting HPM pin=LOW (high power mode). Whether
to use the power supply circuit in this mode should need
the display confirmation by actual equipment.
Besides, if the improvement is insufficient even for the
high power mode setting, the crystal liquid drive power
needs to be supplied externally.
Command sequence when the built-in power
To turn off the built-in power supply, set it in the power
save state and then turn off the power supply according
to the command sequence shown in Fig. 13 (procedure).
D3
1
supply is turned off
D2
0
to
D1
0
D0
0
1
Max.
–5.3
Power save command
(Both stand-by and
sleep can be useal)
[mV]
Unit
[V]
OUT
S1D15705 Series
.
R
pin to OPEN
10–33