
4
LH155BA
SYMBOL
V
DD
V
SS
1. PIN DESCRIPTION
1.1. Power Supply Pins
I/O
DESCRIPTION
Power Supply Power supply pin for logic, connected to +1.8 to +5.5 V.
Power Supply Ground pin, connected to 0 V.
Bias power supply pins for LCD drive voltage.
 When using an external power supply, convert impedance by using resistance-
division of LCD drive power supply or operational amplifier before adding voltage to
the pins.
 When using the external power supply, maintain the following power supply
conditions.
V
SS
 < V
4
 < V
3
 < V
2
 < V
1
 < V
0
, V
SS
 ≤ V
D
 < V
C
 < V
B
 < V
A
 When the power supply circuit is ON at master operation, LCD drive voltages of V
0
to V
4
 are generated by the internal booster circuit and voltage converter. When
using segment display, input V
A
, V
B
, V
C
 and V
D
 level externally.
 When using the internal  power supply, be sure to connect each capacitor between
V
0
 to V
4
, V
A
 to V
D
, and V
SS
.
V
0
V
1
V
2
V
3
V
4
V
A
V
B
V
C
V
D
Power Supply
V
0
-V
4
 for
Graphic
Display
V
A
-V
D
 for
Segment
Display
1.2. LCD Power Supply Circuit Pins
SYMBOL
I/O
DESCRIPTION
CAP+
O
Connecting pin for the internal  booster's capacitor + side.
The capacitor is connected between CAP– and CAP+.
Connecting pin for the internal  booster's capacitor – side.
The capacitor is connected between CAP+ and CAP–.
Connecting pin for the internal  booster's capacitor + side.
The capacitor is connected between V
SS
 and V
EE2
.
CAP–
O
V
R1
V
R2
SVR
I
Used as input pins for graphic display voltage converter.
Voltage must be input between the V
EE
 and V
OUT
 pins by voltage divided by resistors.
Non-connected.
Pin for controlling LCD power supply.
A combination of PMODE pin and ON/OFF command of power supply (PON)
enables selection of a specific drive operation.
V
EE3
O
Connecting pin for the internal  booster's capacitor + side.
The capacitor is connected between V
SS
 and V
EE3
.
Voltage supply pin for generating boosted voltage in the internal booster circuit.
Usually the same voltage level as V
DD
.
Output pin of boosted voltage in the internal booster circuit.
The capacitor must be connected between V
SS
 and V
OUT
.
Non-connected.
V
EE2
O
Power supply
V
EE
V
OUT
Power supply/
O
–
SVOUT
–
PMODE
I