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EM62100AGH 数据表(PDF) 27 Page - ELAN Microelectronics Corp

部件名 EM62100AGH
功能描述  65 COM / 132 SEG STN LCD Driver
PDF  60 Pages
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制造商  EMC [ELAN Microelectronics Corp]
网页  http://www.emc.com.tw
标志 EMC - ELAN Microelectronics Corp

EM62100AGH 数据表(HTML) 27 Page - ELAN Microelectronics Corp

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EM62100
65 COM/132 SEG STN LCD Driver
Product Specification (V1.1) 09.13.2005
•••• 21
(This specification is subject to change without further notice)
NOTE
For the “Step-up system terminals” refer to CAP1+, CAP1-, CAP2+, CAP2-,
CAP3+ and CAP4+.
Other combinations, not shown above, are also possible, but such combinations
are not recommended for they have no practical use.
6.12.1 Step-up Voltage Circuit
With the built-in boost up voltage circuit of the EM62100 chip, it is possible to produce a
5X, 4X, 3X, and 2X step-up of the VEE voltage levels.
The step-up voltage
relationships are shown in Figure 8.
V
SS
V
OUT
CAP3+
CAP1-
CAP1+
CAP2+
CAP2-
CAP4+
V
OUT=5 X VEE=14V
V
OUT=4X VEE=12V
V
OUT=3 X VEE=9V
V
OUT=2 X VEE=6V
V
SS = 0V
V
SS = 0V
V
SS = 0V
V
EE = 2.8V
V
EE = 3V
V
EE = 3V
5X Step-up Voltage
Circuit
4X Step-up Voltage
Circuit
3X Step-up Voltage
Circuit
2X Step-up Voltage
Circuit
CAP3+
CAP1-
CAP1+
CAP2+
CAP2-
CAP4+
CAP3+
CAP1-
CAP1+
CAP2+
CAP2-
CAP4+
CAP3+
CAP1-
CAP1+
CAP2+
CAP2-
CAP4+
V
SS
V
OUT
V
SS
V
OUT
V
SS
V
OUT
V
SS = 0V
V
EE = 3V
Fig. 8
6.12.2 Voltage Regulator Circuit
The step-up voltage generated at VOUT outputs the LCD driver voltage V0 through the
voltage regulator circuit by adjusting resistors, Ra and Rb.
Because the EM62100 chip has an internal high-accuracy fixed voltage power supply
with a 64-level electronic volume function and internal resistors for the V0 voltage
regulator, systems can be constructed without having to include high-accuracy voltage
regulator circuit components.
Using V0 voltage regulator internal resistors
By using the V0 voltage regulator internal resistors and the electronic volume
function, the liquid crystal power supply voltage V0 can be controlled through
command executions alone (without adding external resistors), allowing for
adjustments on the
LCD brightness. The V0 voltage can be calculated using
equation (a) over the range where V0<VOUT.



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