UPD16675AP datasheet(8/36 Pages) NEC

8 / 36 page

µµµµPD16675A

1.3

Driver System

Pin Symbol

Pin Name

Pin No.

I/O

Description

SEG1 to

SEG128

Segment

143 to 16

Segment output pins

COM1 to

COM32

Commons

152 to 156,

163 to 173,

232 to 241

Common output pins

PCOM1,

PCOM2

Pictographic

commons

151, 231

Common output pins for pictograph

AmpIN(

+),

AmpIN(

−)

Operational amplifier

input

183, 182

These are the input pins of the operational amplifier

for LCD drive voltage adjustment. Leave AmpIN(+)

open when using the internal D/A converter. When

not using the D/A converter, it is necessary to input

the reference voltage.

Connect AmpIN(–) to the LCD voltage adjustment

resistor (see the diagram below).

AmpOUT

Operational amplifier

output

184

This is the input pin of the operational amplifier for

LCD drive voltage adjustment. It is normal to

connect this pin to the LCD voltage adjustment

resistor (see the diagram below).

It is recommended to connect approx. 0.1 to 1

µF

capacitor to this pin to stabilize the internal

amplifier’s output.

VOLTAGE CONTROL CIRCUIT EXAMPLE

D/A

Converter

DACHA

AmpIN( )

AmpOUT

VLC1

VLC2

VLC3

VLC4

VLC5

VEE

VEXT

Reference Power Circuit

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