MSM6555B datasheet(9/27 Pages) OKI

Part #	MSM6555B

Description	DOT MATRIX LCD CONTROLLER WITH 17-DOT COMMON DRIVER AND 80-DOT SEGMENT DRIVER

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Manufacturer	OKI [OKI electronic componets]

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•VSS1, VSS4, VSS5

Connect a capacitor of 0.1 mF between these pins and VDD for electric charge distribution and

voltage stabilization concerning the capacitor of VSS2, 3 during generation of various types of

LCD bias voltage.

The logical value for LCD bias voltage is as shown below.

Highest voltage :

VDD

VSS1 = VSS2, 3/2

VSS2, 3

VSS4 = VSS2, 3 + VSS2, 3/2

Lowest voltage :

VSS5 = VSS2, 3 + VSS2, 3/2 + VSS2, 3/2

Æ This is 1/4 bias, which is common to 1/9 duty and 1/17 duty.

• N1, N2

These are input pins used to determine the voltage of VSS2, 3 in combination with the Contrast

Up/Down command.

N2

N1

Command contrast control range

L

0 to 7

L

H

1 to 8

H

L

2 to 9

H

3 to A

•VDD, VSS

These are pins used to connect the VDD to the positive pin of the battery, and the VSS to the

negative pin of the battery.

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