Specifications

8–10 EPSON
SED1240 Series
DESCRIPTION OF PINS
Power Pins
LCD Power Circuit Pins
Pin name I/O Description Q’ty
CAP1+ O Boosting condenser positive side connecting pin. 1
Condenser is connected with the CAP1– pin.
CAP1– O Boosting condenser negative side connecting pin. 1
Condenser is connected with the CAP1+ pin.
CAP2+ O Boosting condenser positive side connecting pin. 1
Condenser is connected with the CAP2– pin.
CAP2– O A boosting condenser negative side connecting pin. 1
Condenser is connected with the CAP2+ pin.
V
OUT O Output pin for boosting. Smoothing condenser is connected 1
with V
DD.
V
R I Voltage adjusting pin. Voltage between VDD and V5 is given by 1
resistance-division.
V
SS2 I Boosting power pin. The voltage between VDD and VSS2 is 1
boosted by a specified multiple.
Pin name I/O Description Q’ty
Board potential IC board is based on V
DD potential. To lock the board potential with VDD.
V
DD Power supply Connected to the logic power supply. This is used in common with 6
the MPU power pin V
CC.
V
SS Power supply 0 V power pin that is connected to system GND. 4
V
0, V1 Power supply Multi-level power supply for liquid crystal drive. 6
V
2, V3 The voltage determined for the liquid crystal cell is applied by
V
4, V5 resistance-division or impedance conversion by operational
amplifier. The potential is determined on V
DD and the following
relations must be observed.
V
DD = V0 ≥ V1 ≥ V2 ≥ V3 ≥ V4 ≥ V5
VDD ≥ V5 ≥ VOUT
VDD ≥ VSS ≥ VSS2 ≥ VOUT
When the built-in power supply is ON, the following voltages are
given to V1 to V4 by command selection.
V
1 = 1/5 V5 1/4 V5
V2 = 2/5 V5 2/4 V5
V3 = 3/5 V5 2/4 V5
V4 = 4/5 V5 3/4 V5
VS1 O Supply voltage output pin for oscillating circuit. 1
Don’t connect a load to the outside.