LC75818PT datasheet(8/43 Pages) SANYO

Part #	LC75818PT

Description	1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function

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Manufacturer	SANYO [Sanyo Semicon Device]

Direct Link	https://www.sanyo-av.com/us/

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LC75818PT

No.A0964-8/43

Pin Functions

Pin No.

Function

Active

I/O

Handling

when unused

S1 to S80

1 to 80

Segment driver outputs.

-

O

OPEN

COM1 to COM10

90 to 81

Common driver outputs.

-

O

OPEN

KS1 to KS6

91 to 96

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.

-

O

OPEN

KI1 to KI5

97 to 101

Key scan inputs.

These pins have built-in pull-down resistors.

H

I

GND

P1 to P4

102 to 105

General-purpose outputs. P4 can be used as a clock output port

with the "set key scan output port/general-purpose output port

state" instruction.

-

O

OPEN

OSC

115

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

118

H

I

CL

119

I

DI

120

-

I

GND

DO

117

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

116

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 S80=”L” (VLCD4)

COM1 to COM10=”L” (VLCD4)

• General-purpose output ports P1 to P4=low (VSS)

• Key scanning disabled: KS1 to KS6=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

114

This pin must be connected to ground.

-

I

-

VLCD0

108

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

109

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

be used to supply the 3/4 (VLCD0 - VLCD4) voltage level

externally.

-

I

OPEN

VLCD2

110

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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