technical data IN472 liquid crystal display controller the IN472 li qui d c r y s t a l di spl a y (ldc ) c ont rol l e r i s a perpheral me mb e r o f t h e c o p s tm fam i l y , fabri cat ed usi ng c m os t echnol ogy . the IN472 drives a m u ltiplexed liquid crystal directly. data is loaded serially and is held in internal latches. the IN472 contains an on-chip oscillator and g e n e rates all th e m u lti-lev e l wav e fo rm s fo r b ack -p lan e s an d seg m en t outputs on a triplex display. one IN472 can drive 36 segm ents m u ltiplexed as 3 x 12 (4 1 / 2 di gi t di spl a y ) . two IN472 devi ces can be used t oget h er t o dri v e 72 segm ent s (3 x 24) whi c h coul d be an 8 1 / 2 di gi t di spl a y . ordering information IN472n pl ast i c IN472dw soic t a = 0 to 7 0 c for all packages ? direct interface to triplex lcd ? low power di ssi pat i on (100 w t y p . ) ? low cost ? c o m p at i b l e wi t h al l c o p400 processors ? needs no refresh from processor ? on -ch i p o s cillato r an d latch e s ? expandabl e t o l onger di spl a y s ? soft ware com p at i b l e wi t h c o p470 v.f.di spl a y dri v er c h i p ? operates from display voltage ? microw i re tm co m p atib le serial i/o pin assignment ? 20-pin dual-in-line package pin description pin description c s c h ip s e l e c t v dd power suppl y (di s pl ay vol t a ge) g n d g r o u n d di seri al dat a i nput sk seri al cl ock i nput bp a disp lay b ack p l an e a (o r o s cillato r in ) bp b display backplane b bp c disp lay b ack p l an e c (o r o s cillato r o u t ) sa1 sa4 1 2 m u ltip lex e d o u t p u t s 1
IN472 dc electrical characteristics (gnd=0 v, v dd =3.0 v to 5.5 v, t a = 0 c to 7 0 c (depends on display characteristics) g u a r a n t e e d l i m i t s y m b o l p a r a m e t e r t e s t conditions m i n m a x uni t v dd power suppl y vol t a ge 3.0 5.5 v i dd power suppl y c u rrent (not e 1) v dd =5.5 v 250 a v il input level s di, sk, c s 0.8 v v ih 0 . 7 v dd v dd v il bpa (as osc. in) 0.6 v v ih v dd - 0 . 6 v dd v ol out put level s , b p c (as osc. out ) 0.4 v v oh v dd - 0 . 4 v dd v bpa,bpb,bpc on backplane outputs ( b p a , b p b , b p c ) duri ng v dd - ? v v dd v v bpa,bpb,bpc off bp + tim e 1/ 3v dd - ? v 1 / 3 v dd + ? v v bpa,bpb,bpc on backplane outputs ( b p a , b p b , b p c ) duri ng 0 ? v v v bpa,bpb,bpc off bp - tim e 2/ 3v dd - ? v 2 / 3 v dd + ? v v seg on segm ent out put s (sa 1 sa 4 ) duri ng 0 ? v v v seg off bp + tim e 2/ 3v dd - ? v 2 / 3 v dd + ? v v seg on segm ent out put s (sa 1 sa 4 ) duri ng v dd - ? v v dd v v seg off bp - tim e 1/ 3v dd - ? v 1 / 3 v dd + ? v in tern al oscillato r freq u e n c y 1 5 8 0 k h z fram e tim e (int. osc. 192) 2 . 4 1 2 . 8 m s 1/ t scan scan frequency 39 208 hz sk c l ock frequency 4 250 khz s k w i dt h 1 . 7 s t setup di dat a st up 1.0 s t hold di dat a hol d 100 ns t setup c s 1 . 0 s t hold 1 . 0 out put loadi ng c a paci t a nce 100 pf not e 1: power suppl y current as m easured i n st and- al one m ode wi t h al l out put s open and al l i nput s at v dd . note 2: ? v - 0.05v dd . 2
IN472 fi gure 1. seri al l oad t i mi ng di agram figure 2. backplane and segment waveforms 3
IN472 n s u f f i x p l as t i c d i p (m s - 0 0 1 a d) sy m b o l m i n m a x a 24. 8 9 26. 92 b 6. 1 7 . 1 1 c 5. 33 d 0. 36 0. 56 f 1. 14 1. 78 g h j 0 10 k 2. 92 3. 81 no t e s : l 7. 62 8. 26 1. d i m e n s i o n s ?a ?, ?b ? d o n o t i n cl u d e m o l d f l as h o r p r o t r u s i o n s . m 0. 2 0 . 3 6 m a x i m u m m o l d f l a s h o r p r o t r u s i o n s 0. 25 m m ( 0 . 010) p e r s i d e . n 0. 38 d su f f i x so i c (m s - 0 1 3 a c) sy m b o l m i n m a x a 12. 6 1 3 b 7. 4 7 . 6 c 2. 35 2. 65 d 0. 33 0. 51 f 0. 4 1 . 2 7 g h no t e s : j 0 8 1. d i m e n s i o ns a a n d b d o no t i n c l ud e m o l d f l a s h o r pr o t r u s i on . k 0. 1 0 . 3 2. m a x i m u m m o l d fl a s h o r p r o t ru s i o n 0 . 1 5 m m (0 . 0 0 6 ) p e r s i d e m 0. 23 0. 32 f o r a ; fo r b ? 0. 25 m m ( 0 . 010) p e r s i d e . p 10 10. 65 r 0. 25 0. 75 d i me n s i o n , mm 1. 27 9. 53 d i me n s i o n , mm 2. 54 7. 62 a b h c k c m j f m p g d r x 4 5 se a t i n g pl a n e 0.2 5 ( 0 . 0 1 0 ) m t -t - 1 20 10 11 l h m j a b f g d se a t i n g pl an e n k 0.2 5 ( 0 . 010) m t -t - c 1 20 10 11 4
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