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UPD16681A

LCD CONTROLLER/DRIVER FOR DOT MATRIX DISPLAY OF JIS LEVEL 1 AND JIS LEVEL 2 KANJI SETS

NEC => Renesas Technology 

µPD16681A

3.3 Driver System Pins

Pin Symbol

Pin Name

Pad No.

I/O

Description

SEG1-SEG96 Segment

115 to 210 Output Segment output pins

COM1-COM51 Common

85 to 105 Output Common output pins

109 to 112

1/52 duty : Use COM1 to COM51

211 to 216

1/39 duty : Use COM1 to COM19, COM27 to COM45 and leave

220 to 239

COM20 to COM26, COM46 to COM51 open

PCOM1,

Pictograph common

240,

Output Common output pins for pictographs

PCOM2

114

The same signal is output from PCOM1 and PCOM2.

AMPIN(+)

Op amp inputs

10 to 13

Input These are input pins for the op amp that regulates the LCD driver voltage.

Leave the AMPIN(+) pin unconnected when using the on-chip D/A converter.

When not using the D/A converter, a reference voltage must

AMPIN(−)

be input.

Connect the AMPIN(−) pin to a resistor used to regulate the LCD voltage.

(See diagram below.)

AMPOUT

Op amp outputs

8,9

Output These are output pins for the op amp that regulates the LCD driver

voltage. Normally, they are connected to resistors that are used to

regulate the LCD voltage. (See diagram below.)

Since the AMPOUT pins are used to stabilize the on-chip amp’s output, we

recommend connecting them to a capacitor that is rated between 0.1 and

1.0 µF.

DUMMY

DUMMY

1, 81 to 84,

− DUMMY pins are not connected to the internal circuit. Leave open if they

106 to 108, 113,

are not used.

217 to 219, 241

Figure 3−1. Voltage Control Circuit

DACHA

AMPIN(+)

D/A

converter

+

−

Reference power supply circuit

AMPIN(−)

AMPOUT

VLC1

VLC2

VLC3

VLCBS1 VLCBS2 VLCBS3

VLC4

VLC5

VSS

VEXT

R2

R1

C1

Data Sheet S14207EJ3V0DS

7

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