UPD16681AP-001 datasheet(11/31 Pages) NEC

Part #	UPD16681AP-001

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

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Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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Data Sheet S14207EJ2V0DS00

11

µµµµPD16681A

4.4 Control of Op Amp for Level Power Supply

Input to the AMPCHA pin is used to control the op amp for the LCD driver level power supply.

• High power mode (AMPCHA = L)

This mode maximizes the LCD drive current supply capacity in the op amp for the LCD driver level power supply.

• Normal mode (AMPCHA = H)

This mode uses a lower LCD drive current supply capacity in the op amp for the LCD driver level power supply,

which is suitable for charging the capacitor used to stabilize the external level.

Caution

For either mode, be sure to connect a level stabilization capacitor (rated from about 0.1 to 1.0

µµµµF)

for the VLC1 to VLC5 pins. Poorer display quality results when these capacitors are not connected.

Figure 4-4. Reference Voltage Circuit

VLC1

R

Output to SEG and COM

VLC2

R

VLC3

R

2R

VLCBS3

VLCBS2

VLC4

R

VLC5

R

AMPOUT

VLCBS1

VSS

Op amp for level driver

+

−

+

−

+

−

+

−

+

−

Output to SEG and COM

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UPD16681AP-001 Datasheet(PDF) 11 Page - NEC

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