Specifications

6–12 EPSON
SED1230 Series
DESCRIPTION OF PINS
Power Pins
LCD Power Circuit Pins
Pin name I/O Description Q’ty
V
DD Power supply Logic + power pin. Also used as MPU power pin VCC.2
V
SS Power supply Logic – power pin. Connected to the system GND. 2
V
0, V1 Power supply Multi-level power supply for liquid crystal drive. 6
V
2, V3 The voltage determined in the liquid crystal cell is resistance-
V
4, V5 divided or impedance-converted by operational amplifier, and the
resultant voltage is applied.
The potential is determined on the basis of V
DD and the following
equation must be respected.
V
DD = V0 ≥ V1 ≥ V2 ≥ V3 ≥ V4 ≥ V5
VDD ≥ VSS ≥ V5 ≥ VOUT
When the built-in power supply is ON, the following voltages are
given to pins V
1 to V4 by built-in power circuit:
V
1 = 1/5 V5
V2 = 2/5 V5
V3 = 3/5 V5
V4 = 4/5 V5
VS1 O Power supply voltage output pin for oscillating circuit. 1
Don’t connect this pin to an external load.
Pin name I/O Description Q’ty
CAP1+ O Capacitor positive side connecting pin for boosting. 1
This pin connects the capacitor with pin CAP1–.
CAP1– O Capacitor negative side connecting pin for boosting. 1
This pin connects a capacitor with pin CAP+.
CAP2+ O Capacitor positive side connecting pin for boosting. 1
This pin connects a capacitor with pin CAP2–.
CAP2– O Capacitor negative side connecting pin for boosting. 1
This pin connects a capacitor with pin CAP2+.
V
OUT O Output pin for boosting. This pin connects a smoothing capacitor 1
with V
SS pin.
V
R I Voltage regulating pin. This pin gives a voltage between VDD and 1
V
5 by resistance-division of voltage.