UPD16680P NEC [NEC], UPD16680P Datasheet - Page 11

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

5.2 LCD driving circuit
5.2.1 To use internal driving circuit, not to use D/A converter ( V
adjusting LCD driving voltage. To connect external resister R
possible to adjust LCD driving voltage of V
temperature characteristic of LCD panel, we recommend connecting it with R
V
Remark R
LC1
When to internal driving circuit is chosen, boosted voltage be used for power of internal operational amplifier
The value of V
= AMP
2
IN
(+) = (1+
=
LC1
R
R
can be computed by the following formula.
Figure 5-2 When not using Internal power supply select or D/A converter
2
2
x R
+ R
R
R
th
th
2
1
V
REF
) V
AMP
AMP
DA
REF
CHA
R
IN(+)
IN(-)
1
LC1
. If using thermistor to adjust LCD driving voltage according to the
D/A
Converter
Data Sheet S12694EJ2V0DS00
+
R
R
2
AMP
th
Equation 5-1
out
1
C
, R
to Internal driving circuit
1
2
V
, and input reference voltage to AMP
LC1
EXT
= L , DA
2
in parallel.
CHA
= L )
IN (+)
pin. It is
PD16680
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