MSM6775 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM6775

1/3, 1/4, 1/5 DUTY LCD DRIVER WITH 5-DOT COMMON DRIVER AND 80-DOT SEGMENT DRIVER

Oki Electric Industry 

¡ Semiconductor

MSM6775

PIN DESCRIPTIONS

Symbol

OSC-IN

OSC-C

OSC-R

DATA

CLOCK

LOAD

BLANK

DSEL1

DSEL2

COM1 to

COM5

SEG1 to

SEG80

VLC1

VLC2

VLC3

VDD

VSS

Type

I

O

O

I

I

I

I

I

I

Description

Pins for oscillation. The oscillator circuit is configured by externally connecting two

resistors and a capacitor. Make the wiring length as short as possible, because the

resistor connected to the OSC-IN pin has a higher value and the circuit is susceptible

to external noise.

Serial data input pin. The display goes on when input data is at "H" level, and it goes

off when input data is at "L" level.

Shift clock input pin. Data from the DATA pin is transferred in synchronization with the

rising edge of the shift clock. (Built-in Schmitt circuit is used.)

Load signal input pin. Serially input data is transferred to the 80-bit latch at "H" level

of this load signal, then held at "L" level.

Input pin that turns off all segments. The entire display goes off when "L" level is

applied to this pin. The display returns to the previous state when "H" level is applied.

Input pins to select 1/3, 1/4, or 1/5 duty. Following shows how each duty is selected.

DSEL2

L

L

H

DSEL1

L

H

X

X: Don't care

Duty selected

1/3

1/4

1/5

Display output pins for LCD. These pins are connected to the COMMON side on the

O

LCD panel.

Display output pins for LCD. These pins are connected to the SEGMENT side on the

O LCD panel. For the correspondence between the output of these pins and input data,

see Section, "Data Structure".

Bias pins for LCD drive. Through these pins, bias voltages for the LCD

— are externally supplied. The bias potential must meet the following condition:

VDD>VLC1≥VLC2>VLC3

— Supply voltage pin and ground pin.

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