Datasheet

Section 26 Electrical Characteristics
Rev. 2.00 Jul. 04, 2007 Page 570 of 692
REJ09B0309-0200
26.2.5 LCD Characteristics
Table 26.7 shows the LCD characteristics.
Table 26.7 LCD Characteristics
V
CC
= 1.8 V to 3.6 V, AV
CC
= 1.8 V to 3.6 V, V
SS
= AV
SS
= 0.0 V, unless otherwise specified.
Values
Item Symbol
Applicable
Pins
Test Condition Min. Typ. Max. Unit Notes
Segment driver drop
voltage
V
DS
SEG1 to
SEG40
I
D
= 2 µA
V1 = 2.7 to 3.6 V
— — 0.6 V *
1
Common driver drop
voltage
V
DC
COM1 to
COM4
I
D
= 2 µA
V1 = 2.7 to 3.6 V
— — 0.3 V *
1
LCD power supply
split-resistance
R
LCD
Between V1 and V
SS
1.5 3.0 7.0 MΩ
LCD display voltage V
LCD
V1 2.2 — 3.6 V *
2
V3 power supply
voltage
V
LCD3
V3 Between V3 and V
SS
0.9 1.0 1.1 V *
3
*
4
V2 power supply
voltage
V
LCD2
V2 Between V2 and V
SS
— 2.0
(V
LCD3
× 2)
— V *
3
*
4
V1 power supply
voltage
V
LCD1
V1 Between V1 and V
SS
— 3.0
(V
LCD3
× 3)
— V *
3
*
4
3-V constant voltage
LCD power supply
circuit supply current
I
LCD
Vcc Vcc = 2.7 V
Booster clock:
32.768 kHz
— 12 — µA Reference
value*
4
*
5
Notes: 1. The voltage drop from power supply pins V1, V2, V3, and V
SS
to each segment pin or
common pin.
2. When the LCD display voltage is supplied from an external power source, ensure that
the following relationship is maintained: V1 ≥ V2 ≥ V3 ≥ V
SS
.
3. The value when the LCD power supply split-resistor is separated and 3-V constant
voltage power supply circuit is driven.
4. For details on the register (BGRMR) setting range when the voltage of the V3 pin is set
to 1.0 V, refer to section 21.3.5, BGR Control Register (BGRMR).
5. Includes the supply current of the band-gap reference circuit (BGR) (operation).