English
Language : 

EM62100 Datasheet, PDF (30/60 Pages) ELAN Microelectronics Corp – 65 COM / 132 SEG STN LCD Driver
◁
EM62100
65 COM/132 SEG STN LCD Driver
6.12.4 High Power Mode
The EM62100 built-in power supply circuit has very low power consumption (normal
mode: HPMB=“H”). If used for LCD panels with large loads, this low-power power
supply may cause the display quality to degrade. When this occurs, setting the HPMB
terminal to “L” (high power mode) can improve the display quality. It is recommended
that the display be checked on the actual equipment to determine whether or not to use
this mode.
Moreover, if the improvement to the display is inadequate even after the high power
mode has been set, then it is a must to add a Command Sequence when the Built-in
Power Supply is turned OFF. To turn off the built-in power supply, follow the command
sequence as shown below, wherein you have to turn it off after making the system
enter the standby mode.
6.12.5 Reference Power Supply Circuit for Driving the LCD Panel
Using all LCD power circuits
(Voltage booster, regulator and follower)
The following diagram illustrates using 4X
boosting circuit and internal regulator
resistors, IRS =1
VDD
Not using voltage booster circuits
The following circuit diagram illustrates
using external regulator resistors, IRS = 0
VDD
C1
C1
C1
C1
C2
C2
C2
C2
C2
VSS
M/S
VOUT
CAP4+
CAP2+
CAP2-
CAP1+
CAP1-
CAP3+
VREF
V0
V1
V2
V3
V4
Using only voltage follower
VDD
External
Power
Supply
Ra
C2
C2
C2
C2
C2
VSS
M/S
VOUT
CAP4+
CAP2+
CAP2-
CAP1+
CAP1-
CAP3+
VREF
V0
V1
V2
V3
V4
Not using internal LCD power supply circuits
VDD
External
Power
Supply
C2
C2
C2
C2
C2
VSS
M/S
VOUT
CAP4+
CAP2+
CAP2-
CAP1+
CAP1-
CAP3+
VREF
V0
V1
V2
V3
V4
Value of External Capacitance
ITEM
C1
C2
Value
1.0 - 4.7 µF
0.1 - 2.2
External
Power
Supply
VSS
M/S
VOUT
CAP4+
CAP2+
CAP2-
CAP1+
CAP1-
CAP3+
VREF
V0
V1
V2
V3
V4
Fig.11
24 •
Product Specification (V1.1) 09.13.2005
(This specification is subject to change without further notice)
 ▷