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T-990D
18
Explanation of terminals
SO~S33, Va: Segment outputs, pull-down resistor com-
mon terminal.
So
$1
$33
Vev
Vop
BLK
: Display OFF input.
BL R= 0" (Vos).....eccscscessssscssesssseeeeesserss OFF
BLK="1" (Vo)... csesesecccssssesecsseserereessees ON
CL, DATA, WR
: Data inputs
Voo, Vss
: Power supply terminals
Data input
CL Pin @
DATA Pin @
WR Pin @®
Display
Input at DO
DO~D33 : Display data
DA~DE_
: Dummy bit (don't care)
DF
: S29~$33
switching
Dn="1"
; Sn="1" (=Voo)
Dn="0"
» Sn="0" (=Vr)
De
"+ D29~D33 > S29~S33
De
="1"
: ADI > $33
AD2 > $32
AD3 > S31
AD4 > S30
AD5 > S29
a
a
I
°
SIN: AD converter input.
1st point lighting level: 0.1 Voo (typical)
2nd point lighting level: 0.2 Voo (typical)
3rd point lighting level: 0.3 Voo (typical)
4th point lighting level: 0.4 Voo (typical)
5th point lighting level: 0.5 Voo (typical)
tl>4 usec
t2>4
«sec
t3 >20 psec
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