UPD16680P NEC [NEC], UPD16680P Datasheet - Page 13

• Manufacturer Part Number: UPD16680P
• Description: 1/53, 1/40 DUTY, LCD CONTROLLER/DRIVER WITH BUILT-IN RAM
• Manufacturer: NEC [NEC]

5.3 REFERENCE VOLTAGE CIRCUIT
5.3.1 To use internal reference voltage circuit ( V
generate by internal breeder resister.
5.3.2 To use external driving circuit ( V
to V
resistance values are big, it is necessary to choose the resistance value which corresponds with the LCD panel.
There is an effect that improves display dignity when connecting a capacitor with each level pins and the ground. It is
necessary to choose the condenser value which corresponds with the LCD panel.
When internal driving circuit is chosen, 6 levels for LCD reference voltage (V
When external driving circuit is chosen, operational amplifier incorporated IC is Off. It is necessary to input voltage
Generally, These levels are made by external breeder resister. The display dignity of LCD declines when these
LC1
, V
LC2
, V
LC3
, V
LC4
and V
LC5
AMP
V
directly.
V
V
LCBS1
V
V
V
LCBS2
LCBS3
V
V
V
LC1
LC2
LC3
LC4
LC5
SS
OUT
Figure 5-3. Reference voltage circuit
R
R
R
R
R
R
R
EXT
= H )
Data Sheet S12694EJ2V0DS00
EXT
= L )
to SEG, COM Outputs
to SEG Output
to COM Output
to SEG Output
to SEG, COM Output
to COM Output
Voltage follower for level voltage
LC1
, V
LC2
, V
LC3
, V
LC4
, V
LC5
, V
SS
PD16680
) is
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