Specifications

EPSON 4–13
SED1220
SED1220
Liquid Crystal Drive Circuit Signals
Dynamic drive terminal (SED1220D
**
/1221D
**
/122AD
**
)
Dynamic drive terminal (SED1222D
**
)
Static drive terminal
Pin name I/O Description Q’ty
COM1~
O Common signal output pin (for characters) 24
COM24
COMS1,
O
Common signal output pin (except for characters)
2
CMOS2 CMOS1, CMOS2: Common output for symbol display
SEG1~
O Segment signal output pin (for characters) 60
SEG60
SEGS1, 2
O
Segment signal output pin (except for characters)
4
4, 5 SEGS1, SEGS2: Segment output for signal output
Pin name I/O Description Q’ty
COM1~
O Common signal output pin (for characters) 16
COM16
COMS1,
O
Common signal output pin (except for characters)
2
CMOS2 CMOS1, CMOS2: Common output for symbol display
SEG1~
O Segment signal output pin (for characters) 60
SEG60
Pin name I/O Description Q’ty
COMSA O Common signal output pin (for icon) 1
SEGSA, B
Segment signal output pin (for icon) 5 to
C, D, E O
SEGSF, G, H, I, J (only SED122A) 10
F, G, H, I, J
Note: For the electrode of liquid crystal display panel to be connected to the static drive terminal, we recommend
you to use a pattern in which it is separated from the electrode connected to the dynamic drive terminal.
When this pattern is too close to the other electrode, both the liquid crystal display and electrode will be
deteriorated.