Pin Functions

No. 7389-5/27

LC75847T

Symbol

Pin No.

Function

Active

I/O

Handling

when unused

1 to 8

9 to 105

109 to 107

106

116

118

120

119

117

112

S1/P1 to S8/P8

S9 to S105

COM1 to COM3

COM4/S106

OSC

CE

CL

DI

INH

Segment outputs for displaying the display data transferred by serial data input. The

pins S1/P1 to S8/P8 can be used as general-purpose output ports when so set up by

the control data.

Common driver outputs.

The COM4/S106 pin can be used as a segment output in 1/3 duty.

Oscillator connection.

An oscillator circuit is formed by connecting an external resistor and capacitor to this

pin.

Serial data transfer inputs. These pins are connected to the control microprocessor.

CE: Chip enable

CL: Synchronization clock

DI: Transfer data

Display off control input

(These pins are forcibly set to the segment output port function

Note that serial data transfers can be performed when the display is forced off by this

pin.

LCD drive 3/3 bias voltage (high level) supply. This level can be modified using the

equal to 2.7 V. Also, since this IC provides the built-in display contrast adjustment

circuit, applications must not attempt to provide this level from external circuits.

—

—

—

H

—

L

—

O

O

I/O

I

I

I

I

O

Open

Open

GND

GND

Open

113

114

110

111

Logic block power supply. Provide a voltage in the range 2.7 to 6.0 V.

a voltage in the range 2.7 to 6.0 V.

—

—

—

—

I

I

—

—

Open

Open

—

—

115

Ground pin. Connect to ground.

—

—

—