UPD16488AP NEC [NEC], UPD16488AP Datasheet - Page 34

• Manufacturer Part Number: UPD16488AP
• Description: 1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM
• Manufacturer: NEC [NEC]

(2) When using an external resistor (instead of using the on-chip resistor for V
added between V
V
contrast of the LCD contents via commands.
value is set using an external division resistor and is automatically selected by the DTY flag in the control register 2 (R1).
V
Example 1. DTY = 0, normal display mode
Example 2. DTY = 1, partial display mode
Instead of using only the on-chip resistor setting for V
In addition, the PD16488A enable selection between two display values (for normal display and partial display).
The V
LCD
OUT
34
. In such cases, the electronic volume function can be used to control the LCD drive voltage V
.
LCD
V
V
Remark V
V
V
Remark V
value can be determined using Example 1 (DTY = 0) and Example 2 (DTY = 1) if it is within the range of V
LCD
LCD
LCD
LCD
= (1 +
= (1 +
= (1+
= (1+
SS
and V
R
R
EV
EV
R ) V
R
R ) (1
R
a
a
R
R
b
a
b
a
= (1
(1
(R
R
b
b
R
, between AMP
b
b
Rc
Rc
EV
384
Rc
384
Rc)
384
) V
) (1
Ra'
) V
) V
V
Figure 5-13. When Using External Resistor
REG
) V
R
EV
REG
REG
384
OUTP
+
-
) V
and AMP
Data Sheet S15745EJ2V0DS
REG
Rb'
Rc
AMP
LCD
OUT
A
A
OUT
A
voltage regulation (IRS = L), resistors (Ra', Rb' and Rc') can be
, and between V
AMP
V
B
B
B
LCD
(DTY = 0)
(DTY = 1)
Normal display mode
Partial display mode
OUTP
Normal/partial V
select circuit
R
and AMP
LC1
LCD
regulation
OUT
voltage regulation)
to set the LCD drive voltage
LCD
and to regulate the
PD16488A
The
LCD