Seven-Segment Display Driver

Transcription

1 7-Smnt Disply Drivr, Ron s in 7-Smnt Disply Drivr, Ron s in Prolm BCD Diits in inry Dsin Drivr Loi 4 inputs, 7 outputs 7 mps, h with 6 on t rs Gnrt Mps Choos smnt in ll th squrs whr is lit. Rptor,,... LOGIC Dsin this loi Diml iits isply Not th, 6, 7 n 9 r hn rom th oriinl nots. Diits with lit Diits with lit Diits with lit Diits with lit Diits with lit Diits with lit Diits with lit Print; 3/02/03 Sli: Exmpl Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. Svn-Smnt Disply Drivr. Dsin Exmpl Svn-Smnt Disply Drivr Th sli ov, shows th rs in svn smnt isply suh s is us in mny utomotiv shor isplys, or othr riht isplys. All th iits rom 0 throuh nin n shown y lihtin th propr rs. Dsin iruit whih tks inry-o-iml (BCD) iit in on ls,, n n sns out th propr sinls to liht th 7-smnt isply on ls,,,,,, n. Binry-o iml (BCD) iits only o rom 0 to 9. Th othr numrs, 0 throuh 5 will nvr riv s inputs. Utiliz this t in your solution. PROBLEM 62. FROM DIG3CIRJ (This prolm is th sis or th ompnyin nots) \ Th iits on th riht hv rvis orm or, 7, 6 n 9. Driv th qutions or th isply rivrs. Kp th sm nottion or ll itms tht o not hn. Rvis isply Minimiz th qutions or multipl outputs, s is on in th nxt w ps. I you hv nw trms, th lttrs H, Q, R, S, T, U n V hv not n us.. Th riht liht-mittin io isplys us 7-smnts s shown. Th immr wth n ontrol pnl isplys r usully liqui rystl n hv mor omplx rivr loi. Print; 3/02/03 Commnt on Sli Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 2

2 7-Smnt Disply Drivr, Ron s in Mps or 7-Smnt Disply Drivr Minimiztion Diits with lit Trnsr lit smnt mps to Krnuh mps Look or isolt s with no nihours. Expn irls to inlu Look or isolt pirs o s with no nihours. Ths will lwys hv to irl iniviully. Print; 3/02/03 CommntonSli 2 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 3 Typil Minimiztion Prour This shoul work irly wll s s nrl prour, ut lvr prson my in mor iint prours or rtin prolms.. Lot isolt s. Ths r s in squr tht nnot roup with ny othr squr xpt possily squr. 2. Cirl ths isolt s Isolt n xpn th irl to inlu ny s. 3. Lot isolt pirs o s in whih nithr n pir with nothr ny othr squr. 4. Cirl this pir n xpn th irl to inlu ny s. Isolt pir Print; 3/02/03 Commnt on Sli 2 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 4

3 Mps or 7-Smnt Disply Drivr, Mps or 7-Smnt Disply Drivr, Minimiztion Exmpl: ns only two AND ts Look or hl-mp irls (on lttr trms) or thr irls Ths o not rquir n AND t. Hn thy n lwys irl without loss o potntil t shrin. Print; 3/02/03 Sli 3 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 5 Mps or 7-Smnt Disply Drivr Minimiztion (ontinu) Cirls tht ovr hl th mp Ths r rprsnt y sinl lttr n r prtiulrly oo. Sin thy only ontin sinl lttr, thy o not n n AND t. Th input n irtly into th OR t. Thr is no vnt to shrin ths trms twn mps us thr is no hrwr to shr. 5. Lot ll irls whih, with s i n, ovr hl o mp. Thr r som nin o thm in this xmpl. 6. It is sy to ovro this stp On o ths irls ovr no s tht r not ovr y othr irls. Th only nw squrs it ovrs ontin s n hn r uslss. Th mp h suh uslss irl whih is rmov low. Print; 3/02/03 Commnt on Sli 3 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 6

4 Mps or 7-Smnt Disply Drivr, Mps or 7-Smnt Disply Drivr, On prtnr squrs. Squrs with only on prtnr: (S rrows ) s on't ount. Sinl irl i: Squr is isolt on nothr mp. Squr hs irnt sinl prtnr on nothr mp, n oth prtnrs join othr irls. G H G H Els irl oth prtnrs. 3 AND ts 4ANDts Thyrunliklytoshrl. Thr is no xmpl in Expn irls to inlu s; lihtr (lu) irls. th BCD isply mps. Print; 3/02/03 Sli 4 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 7 Disply Drivr, On Prtnr Squrs Minimiztion (ontinu) Squrs tht hv on prtnr Ths squrs n nirl with on n only on othr squr. s on t ount s prtnr. Thr r two ss, pnin on wht is t th sm position on th othr mps Th squr mths n isolt squr on nothr mp Mp hs suh squr. It n ivn sinl irl or oul squr irl. Lookin t mp on ss it hs to hv sinl irl. It n o oul uty i this trm,, is ivn sinl irl on h mp.( Th pir mths nothr sinl prtnr squr. Mp hs suh squr. hs on possil prtnr. On ll th othr mps whr =, it hs th sm prtnr (mps n ), or is ovr lry (mps n ). This mns it is not likly nit or sinl irl. Cirl oth prtnrs. Thn xpn to ovr th s. Mp hs suh squr. hs on possil prtnr. Th prtnr works on mp, n hs nothr prtnr. Cirl oth prtnrs n xpn th irl to ovr th s. Thr is no xmpl in th BCD isply whr suh trm shoul hv only sinl irl. Print; 3/02/03 Commnt on Sli 4 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 8

5 Mps or 7-Smnt Disply Drivr, Print; 3/02/03 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 9 Mps or 7-Smnt Disply Drivr, Finl ill in A trms to ovr thm Hr two xtr trms, K n L, K K L Unovr its intii s Duplit irls rom othr mps i niil. ovr ll unirl squrs. L K Sli 5 Print; 3/02/03 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 0 Commnt on Sli 5 Disply Drivr, Finl Fill In Minimiztion (ontinu) Squrs tht r lt Ths squrs hv littl hn o shrin y irlin smllr thn optimum irl. Chk ll th irls so r n s i ny n rus on othr mps. Howvr kp your ys opn. For ll svn mps, th lrst irls ppr to optimum. Howvr nothr irlin, usin smllr irls, miht still optimum. Mp n us irl rom n rom.

6 Mps or 7-Smnt Disply Drivr, Mps or 7-Smnt Disply Drivr, Form Equtions Ll AND trms with lttrs I on trm ovrs squr rpl y lttr I svrl trms ovr squr lvs. K M N P J= K= L= M= N= P= Q= R= Siz msurs = 44 lttrs (litrls) 5 ts 44 t inputs K J K L J N L J Q M M P R R N R K = K+N++ =J+K+L+ =J+L++ =N+M+P+K+ =K+Q+P =+R =+M+N+R Print; 3/02/03 Sli 6 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. Disply Drivrs, Formin Equtions Disply Drivrs, Formin Equtions On wy o ormin qutions is to put lttr lik J,K L... in th squr ovr y irl. Th on n writ th OR inputs or th qution o th mp y writin own th lttrs. To voi onusion, lv in squrs whih r ovr y svrl irls. All lttrs must ppr t lst on, or th irl thy rprsnt is runnt. Trms whih hv only on input lik, o not rquir spil lttr, n w iv thm th nm o th input vril. It is vry hr to in th optiml irlin in prolm o this siz. Print; 3/02/03 Commnt on Sli 6 Moii; Frury 3, 2003 John Kniht Exmpl rom Diitl Ciruits p. 2