EM62100AGH datasheet(27/60 Pages) EMC

27 / 60 page

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.

OUT

CAP3+

CAP1-

CAP1+

CAP2+

CAP2-

CAP4+

OUT=5 X VEE=14V

OUT=4X VEE=12V

OUT=3 X VEE=9V

OUT=2 X VEE=6V

SS = 0V

EE = 2.8V

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+

OUT

SS = 0V

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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