UPD16680 datasheet(9/44 Pages) NEC

9 / 44 page

Data Sheet S12694EJ2V0DS00

µµµµPD16680

3.3 Driver System Pins

Pin Symbol

Pin Name

Pin No.

I/O

Function Description

SEG1 to

SEG100

Segment

132 to 231

Segment output pins.

COM1 to

COM51

Common

102 to 112,

117 to 130,

232 to 247,

252 to 261

Common output pins

PCOM

Pictographic common

131, 262

Common output pins for pictograph.

(Same waveform output from these pins.)

AMPIN(+)

19, 20

AMPIN(-)

Operational amplifier input

16,17

These pins are the input pins of operational amplifier for LCD

driving voltage adjustment.

When using the internal D/A converter, leave AMPIN(+) open.

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

input the reference voltage.

AMPIN(–) is connected to the resister for LCD driving voltage

adjustment.

See 4. LCD DRIVING VOLTAGE CONTROL CIRCUIT.

AMPOUT

Operational amplifier

output

13,14

This is the input pin of operational amplifier for LCD driving

voltage adjustment. Normally it is connected to the resister for

LCD driving voltage adjustment. See 4. LCD DRIVING

VOLTAGE CONTROL CIRCUIT. It recommends to connect to

this pin a 0.1 to 1

µF capacitor to make the output of the

internal operational amplifier be stable.

Dummy

Dummy pad

1, 2, 3, 9, 12,

15, 18, 21,

24, 28, 32,

33, 40, 44,

54, 76,

98 to 101,

113 to 116,

248 to 251,

263, 264

Dummy pins are not connected to the internal circuit. Leave

open if they are not used.

4. LCD DRIVING VOLTAGE CONTROL CIRCUIT

Reference power circuit

D/A

Converter

DACHA

AMPIN(+)

AMPIN(−)

AMPout

VLC1

VSS

VEXT

−

VLC2

VLC3

VLC4

VLC5

VLCBS1

VLCBS2

VLCBS3

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