LC75812PT datasheet(8/54 Pages) SANYO

部品番号	LC75812PT

部品情報	1/8, 1/9 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function

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メーカー	SANYO [Sanyo Semicon Device]

ホームページ	https://www.sanyo-av.com/us/

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LC75812PT

No.A1417-8/54

Pin Functions

Pin No.

Function

Active

I/O

Handling

when unused

S1 to S64

S65/COM9

1 to 64

65

Segment driver outputs.

S65/COM9 can be used as common driver output pin under the

"set display technique" instruction.

-

O

OPEN

COM1 to COM8

73 to 66

Common driver outputs.

-

O

OPEN

KS1/P1

KS2/P2

KS3 to KS6

KS7/P3

74

75

76 to 79

85

Key scan outputs. Although normal key scan timing lines require

diodes to be inserted in the timing lines to prevent shorts, since

these outputs are unbalanced CMOS transistor outputs, these

outputs will not be damaged by shorting when these outputs are

used to form a key matrix.

KS1/P1, KS2/P2, and KS7/P3 can be used as general-purpose

output ports under the "set key scan output port/general-purpose

output port state" instruction.

-

O

OPEN

KI1 to KI5

80 to 84

Key scan inputs.

These pins have built-in pull-down resistors.

H

I

GND

OSC

95

Oscillator connections. An oscillator circuit is formed by

connecting an external resistor and capacitor to this pin.

This pin can also be used as the external clock input pin with the

"set display technique" instruction.

-

I/O

VDD

CE

98

H

I

CL

99

I

DI

100

-

I

GND

DO

97

Serial data interface connections to the controller. Note that DO,

being an open-drain output, requires a pull-up resistor.

CE: Chip enable

CL: Synchronization clock

DI: Transfer data

DO: Output data

-

O

OPEN

INH

96

Input that turns the display off, disables key scanning, and

forces the general-purpose output ports low.

• When INH is low (VSS):

• Display off

S1 to S64=”L” (VLCD4)

S65/COM9=”L” (VLCD4)

COM1 to COM8=”L” (VLCD4)

• General-purpose output ports P1 to P3=low (VSS)

• Key scanning disabled: KS1 to KS7=low (VSS)

• All the key data is reset to low.

• When INH is high (VDD):

• Display on

• The state of the pins as key scan output pins or

general-purpose output ports can be set with the

"set key scan output port/general-purpose output

port state" instruction.

• Key scanning is enabled.

However, serial data can be transferred when the INH pin is low.

L

I

VDD

TEST

94

This pin must be connected to ground.

-

I

-

VLCD0

88

LCD drive 4/4 bias voltage (high level) supply pin. The level on this

pin can be changed by the display contrast adjustment circuit.

However, (VLCD0 - VLCD4) must be greater than or equal to 4.5V.

Also, external power must not be applied to this pin since the pin

circuit includes the display contrast adjustment circuit.

-

O

OPEN

VLCD1

89

LCD drive 3/4 bias voltage (middle level) supply pin. This pin can

be used to supply the 3/4 (VLCD - VLCD4) voltage level externally.

-

I

OPEN

VLCD2

90

LCD drive 2/4 bias voltage (middle level) supply pin. This pin can

be used to supply the 2/4 (VLCD0 - VLCD4) voltage level

externally.

-

I

OPEN

Continued on next page.

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