UPD16680 NEC, UPD16680 Datasheet - Page 12

• Manufacturer Part Number: UPD16680
• Description: 1/53/ 1/40 DUTY/ LCD CONTROLLER/DRIVER WITH BUILT-IN RAM
• Manufacturer: NEC

5.2.2 To use internal driving circuit and D/A converter ( V
command.
To set 6-bit data to D/A converter register, reference voltage V
The formula of V
.
5.2.3 To use external driving circuit ( V
Therefore, it is impossible to use operational amplifier for LCD driving and D/A converter function. LCD driving
voltage is adjust by the voltage inputted to V
Remarks 1. Set V
12
To use D/A converter, it is possible to adjust reference voltage V
When external voltage supply circuit for LCD driving is chosen, operational amplifier incorporated IC is off.
2. DA
3. Set AMP
LC1
CHA ,
LCD
is as same written in Equation 5-1.
AMP
OUT
V
Figure 5-3 Using internal power supply select and D/A converter
LC1.
IN
(+)
AMP
pin "open".
Open
, AMP
V
DD
IN(+)
AMP
DA
IN
(-)
CHA
R
are CMOS input. Set H level or L level.
IN(-)
1
EXT
LCD
= H )
Data Sheet S12694EJ2V0DS00
D/A
Converter
and V
V
+
R
R
REF
2
AMP
th
LC1
pins directly.
out
C
EXT
REF
to Internal driving circuit
1
is choose one level from 64 level in 1/2 V
= L , DA
V
V
REF
DD
LC1
inputted to AMP
CHA
= H )
IN (+)
pin for LCD driving by
DD
PD16680
to V
DD
.