Sed1120(Lcddriver) - Epson PX-8 Technical Manual

REV.-A
7.9 SED1120 (LCD Driver)
SED1120 is the X driver of the LCD. It converts serially transmitted data to parallel data in 4-bit
units and outputs drive signals to 64 segments. The internal diagram is shown in Fig. 7-18.
The drive level voltage may vary according to data received via DINs 0 to
3.
VL5
VL3
VL2
VLG
VDD
DINO
DINl
DIN2
DIN3
XSCL
FR
LP
XECL
EI
EO
SEG ........................................................................................................................ SEG 65
"
t
t
LCD DRIVER
~
LEVEL SHIFT
;>--
--'"' ,.
EX-OR
>--
,.
LATCH
~
t
~
..
,.
...
SHIFT REGISTER
,.
r - -
>--
~>--
~
0:
I- w
~>--
L.L.
L.L.
::>
~>--
co
~
l-
t -
::>
VOLTAGE CONTROL
~
a..
...
,
z r--
,
r----
-
,
I----
-
..........
,
.,
ENABLE CONTROL
,.
-
Fig.7-18
7-39