UPD16681A Просмотр технического описания (PDF) - NEC => Renesas Technology

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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

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 µF)

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

Figure 4−4. Reference Voltage Circuit

AMPOUT

VLC1

+

−

R

Output to SEG and COM

VLC2

+

−

R

Output to SEG and COM

VLC3

+

−

VLCBS1

R

VLCBS2

Output to SEG and COM

Op amp for level driver

R

VLCBS3

2R

VLC4

+

−

R

VLC5

+

−

R

VSS

Output to SEG and COM

Output to SEG and COM

Output to SEG and COM

Data Sheet S14207EJ3V0DS

11

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