Specifications

5–6 EPSON
SED1225 Series
PIN DESCRIPTION
Power Supply Pins
Notes: Two VSS pins are provided. As they are commonly connected inside the IC, an input into any VSS can be used
if power impedance is low. To have the enough noise resistance, however, the VSS power input from each pin
is recommended.
LCD Power Pins
LED Drive Terminal
Pin Name I/O Description No. of Pins
VDD Power supply
Connects to the logic power supply. This is common to the Vcc power pin of
1
the MPU.
VSS Power supply 0V power pin connected to system ground (GND) 2
V
1, V3
Power supply
Multi-level LCD drive power supplies. A capacitor is required for external
4
V4, V5 stabilization.
VS1 O
Output pin of oscillator (OSC) power voltage. A capacitor is required for
1
stabilization.
Pin Name I/O Description No. of Pins
VREG2
O
Output pins of LCD voltage and amp source power supplies.
1
A capacitor is required for stabilization.
OCA
OCB
OCC O A voltage capacitor pin. A capacitor is required for amplification. 5
OCD
OCE
Pin Name I/O Description No. of Pins
XLE1
O
An Nch open drain output terminal to drive the LED.
2
XLE2 Connects to the LED cathode.