NEC PD78F9488 User Manual
Page 359
CHAPTER 22 ELECTRICAL SPECIFICATIONS (
µ
PD789488, 78F9488, 789489, 78F9489)
User’s Manual U15331EJ4V1UD
359
LCD Characteristics (T
A
= –40 to +85
°C, V
DD
= 1.8 to 5.5 V)
Parameter Symbol
Conditions
MIN.
TYP.
MAX.
Unit
GAIN = 1
0.84
1.0
1.165
V
LCD output voltage
variation range
V
LCD2
C1 to C4
Note 1
= 0.47
µ
F
GAIN = 0
1.26
1.5
1.74
V
Doubler output
V
LCD1
C1 to C4
Note 1
= 0.47
µ
F 2V
LCD2
–0.1
2V
LCD2
2V
LCD2
V
Tripler output
V
LCD0
C1 to C4
Note 1
= 0.47
µ
F 3V
LCD2
–0.15
3V
LCD2
3V
LCD2
V
GAIN = 0
1.8
≤ V
DD
< 5.5 V
0.5
s
5.0
≤ V
DD
≤ 5.5 V
2.0
s
4.5
≤ V
DD
< 5.0 V
1.0
s
Voltage boost wait
time
Note 2
t
VAWAIT
GAIN = 1
1.8
≤ V
DD
< 4.5 V
0.5
s
LCD output voltage
differential
Note 3
(common)
V
ODC
I
O
=
±5
µ
A
0
±0.2 V
LCD output voltage
differential
Note 3
(segment)
V
ODS
I
O
=
±1
µ
A
0
±0.2 V
Notes 1. This is a capacitor that is connected between voltage pins used to drive the LCD.
C1: A capacitor connected between CAPH and CAPL
C2: A capacitor connected between V
LC0
and V
SS
C3: A capacitor connected between V
LC1
and V
SS
C4: A capacitor connected between V
LC2
and V
SS
2. This is the wait time from when voltage boosting is started (VAON0 = 1) until display is enabled
(LCDON0 = 1).
3. The voltage differential is the difference between the segment and common signal output’s actual and
ideal output voltages.
Data Memory STOP Mode Low Supply Voltage Data Retention Characteristics (T
A
= –40 to +85
°C)
Parameter Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Data retention power
supply voltage
V
DDDR
1.8
5.5
V
Release signal set time
t
SREL
0
µ
s