SED1565 EPSON [Epson Company], SED1565 Datasheet - Page 46

• Manufacturer Part Number: SED1565
• Description: Direct display of RAM data through the display data RAM
• Manufacturer: EPSON [Epson Company]

SED1565 Series
* When the V
* The V
* Because the input impedance of the V
The Liquid Crystal Voltage Generator Circuit
The V
divider within the IC, and can be produced at the V
V
driving. Moreover, when the voltage follower changes
the impedance, it provides V
liquid crystal drive circuit. 1/9 bias or 1/7 bias for
SED1565 Series, 1/8 bias or 1/6 bias for SED1566
Series and 1/6 bias or 1/5 bias for the SED1567 Series
can be selected.
8–44
3
the electronic volume function is used, it is necessary
to at least set the voltage regulator circuit and the
voltage follower circuit to an operating mode using
the power control set commands. Moreover, it is
necessary to provide a voltage from V
Booster circuit is OFF.
regulator internal resistors are not used (i.e. the IRS
terminal = “L”). When the V
internal resistors are used (i.e. when the IRS terminal
= “H”), then the V
high, it is necessary to take into consideration short
leads, shield cables, etc. to handle noise.
, and V
5
R
voltage is produced by a resistive voltage
terminal is enabled only when the V
4
voltage levels required for liquid crystal
Sequence
Step1
Step2
End
5
voltage regulator internal resistors or
R
terminal is left open.
Internal power supply OFF
Display all points ON
(Command, status)
1
Display OFF
, V
Details
5
2
, V
voltage regulator
3
and V
OUT
R
terminal is
when the
5
4
voltage
to the
1
, V
D7
1
1
2
Figure 22
EPSON
,
D6
0
0
Command address
D5
1
1
High Power Mode
The power supply circuit equipped in the SED1565
Series chips has very low power consumption (normal
mode: HPM = “H”). However, for LCDs or panels with
large loads, this low-power power supply may cause
display quality to degrade. When this occurs, setting the
HPM terminal to “L” (high power mode) can improve
the quality of the display. We recommend that the
display be checked on actual equipment to determine
whether or not to use this mode.
Moreover, if the improvement to the display is inadequate
even after high power mode has been set, then it is
necessary to add a liquid crystal drive power supply
externally.
The Internal Power Supply Shutdown
Command Sequence
The sequence shown in Figure 22 is recommended for
shutting down the internal power supply, first placing
the power supply in power saver mode and then turning
the power supply OFF.
D4
0
0
D3
1
0
D2
1
1
D1
1
0
D0
0
1
Power saver
commands
(compound)