Myalarm V-LCD1 Manuel d'utilisateur télécharger pdf (Page 13)

MC5701 LCD Driver

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6. PIN DESCRIPTIONS

Pin Names

I/O

Active

Handling

when unused

Pin Description

Pin No.

SEG1 – SEG12

O

–

Open

Segment outputs for displaying the display

data transferred by serial data input.

138 – 149

SEG13 – SEG105

1 – 93

COM1

COM2

COM3

COM4/SEG106

O

–

Open

Common driver outputs.

The frame frequency is fO Hz.

The COM4/SEG106 pin can be used as a

segment output in 1/3 duty and static drive.

97, 134

96, 135

95, 136

94, 137

OSC

I/O

–

VDD

An oscillator circuit is formed by connecting

an external resistor and capacitor to this pin.

113

CE

I

H

GND

Serial data transfer inputs. These pins are

connected to the control microprocessor.

CE: Chip enable

CL: Synchronization clock

DI: Transfer data

111

110

109

CL

DI

–

INHB

I

L

GND

Display off control input

• INHB=low (VSS) – off

SEG1 to SEG105=low (VSS)

COM1 to COM3=low (VSS)

COM4/S106=low(Vss)

• INHB=high (VDD) – on

Note that serial data transfers can be

performed when the display is forced off by

this pin.

112

VLCD

–

–

–

LCD driver block power supply. When VLCD0

is between 0.7VLCD and 0.95VLCD, supply a

voltage in the range 4.0 to 6.0V. When

VLCD0 and VLCD will be equal, supply a

voltage in the range 2.7 to 6.0V.

119

VLCD0

O

–

Open

LCD Drive 3/3 bias voltage (high level)

supply. This level can be modified using the

display contrast adjustment circuit. However,

note that VLCD0 must be greater than or

equal to 2.7V. Also, since this IC provides the

built-in display contrast adjustment circuit,

applications must not attempt to provide this

level from external circuits.

120

VLCD1

I

–

Open

LCD drive 2/3 bias voltage (middle level)

supply. It is possible to supply the 2/3 VLCD0

voltage to this pin externally. This pin must be

shorted to VLCD2 if 1/2 bias is used.

121

VLCD2

I

–

Open

LCD drive 1/3 bias voltage (middle level)

supply. It is possible to supply the 1/3 VLCD0

voltage to this pin externally. This pin must be

shorted to VLCD1 if 1/2 bias is used.

122

DUMMY

–

–

–

NC pins

98 – 103,

128 – 133

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 37 38

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