Trng i Hc Bch Khoa H Ni Khoa in T Vin Thng====o0o====

BO CO THC TP THIT K MCH IN BNG PHN MM ORCAD9.2

Sinh vin thc hin : Nguyn Tng Lm Lp M s sinh vin : T5- K52 : 20071666

H Ni, nm 2010

Li m ui vi sinh vin ngnh in t vin thng k nng thit k mch in cho mch in t l mt k nng c bn,vi s pht trin ca my tnh th thit k mch in ngy cng tr nn n gin v d dng vi rt nhiu phn mm nh,trong c nhng phn mm rt quen thuc nh orcad,autocad,protell... Phn mm thit k mch in orcad vi nhiu phin bn c nng cp thng xuyn c rt nhiu u im so vi cc phn mm thit k mch in khc.Orcad c giao din p d s dng,th vin c nhiu linh kin c chn la v c th update.Vi bi thc tp thit k mch in s dng orcad gip em cng nm r v thnh tho hn trong vic v s nguyn l v thit k mch in. Sau y em xin trnh by thit k s nguyn l v mach in cho Mch iu khin n chy dng 4017 bng phn mm Orcad 9.2

Thit K Mch In Bng Phn Mm ORCAD 9.2I. Cch v s nguyn l bng Capture CIS khi ng chng trinh v s nguyn l trong ORCAD ta chn Start > Programs > Orcad Family Release 9.2 > Capture CIS.

T mn hnh giao din Capture C chn File > New > Project. Hp thoi New Project xut hin. Ti khung Create a New Project Using nhp chn Schematic. Ti khung name nhp tn cn t.Sau khi chn xong tt c nhn OK.

Sau giao din thit k s xut hin,by gi ta s chn linh kin v mch nguyn l,ta chn biu tng Place part gc phi mn hnh hoc nhn t hp phm Shift P.Trn mn hnh s xut hin giao din Place Part. Ta c th vo Add Library ly thm linh kin.

Sau chng ta ly ht linh kin cn thit ra mn hnh lm vic. Mch bao gm: 13 in tr, 1 bin tr, 2 t khng phn cc, 11 Led, 1 chn cm 2 chn, 1 t phn cc, 1 IC LM555, 1 IC 4017, 5 chn Mass, 5 ngun Vcc.

Ta thy cc IC thiu 1 s chn Mass, tin hnh ly chn ny ra bng cch kch vo biu tng linh kin ri nhp chut phi, mt c s xut hin ta kch v Edit Part.

Thc hin cho IC LM555, 1 mn hnh xut hin cho thy 1 chn b n, bn nhp chn v nhp phi vo chn , 1 ca s xut hin nhp chut vo Edit Properties.

Hp thoi Pin Properties xut hin nhp chut vo vung mc Pin Visible sau nhp vo mc Shape v chn Line. Chn xong nhn OK.

Ta di chuyn chn s 8 bng cch nhp chut vo chn s 8 ri r chut n v tr cn t ri th chut.C th cho n khi cc chn c sp xp nh hnh v.

Thc hin xong ta ng ca s li. Hp thoi Save Part Intance xut hin, bn nhp chut vo Update Current thay i c hiu lc.

Vic ly chn cho IC 4017 cng tng t nh IC LM555. Sauk hi thc hin ta c IC nh sau

Sau khi di chuyn linh kin theo s nguyn l ta c nh sau

Tin hnh ni chn cc linh kin theo s nguyn l. Nhp chut vo biu tng Place Wire . Nhp chut tai chn linh kin cn ni, di chuyn chut n chn linh kin cn ni vi n v nhp chut. C tip tc nh vy cho n khi tt c linh kin c ni theo s nguyn l sau:

thay i gi tr linh kin, ta kch p vo gi tr linh kin cn thay i. Hp thoi Display Properties xut hin, ti khung Value hy nhp gi tr cn t cho linh kin. Nhp gi tr xong nhn nt OK.

Sau khi thay i gi tr linh kin ta thu c s nguyn l hon chnh sau

kim tra li ca s nguyn l ta nhp chut vo biu tng Minimize gc phi pha trn mn hinh. Mn hnh sau xut hin, ti khung bn tri kick chn trang PAGE1. Sau nhp chut vo biu tng Design rules check trn thanh cng c kim tra li.

Hp thoi Design rules check xut hin, kick chut vo nt OK tin hnh kim tra li. Nu ko thy thng bo g c ngha l mch khng c li.

Tip tc to tp tin c ui .mln thit k mch in. Nhp chut vo biu tng Create Netlist trn thanh cng c.

Hp thoi Create Netlist xut hin, nhp chut vo Layout, tai khung Netlist File chn ng dn. Chn xong nhn OK.

II. V mch in bng Layout Plus Chng ta tip tc chuyn sang ch thit k mch in ta chn Start > Programs > Orcad Family Release 9.2 > Layout Plus

Mn hnh thit k xut hin, nhp chut vo File > New m 1 file mi. Hp thoi Load Template File xut hin, nhp chut vo Open.

Hp thoi Load Netlist Source xut hin, chn tn mch cn thit k, chn xong nhn OK.

Hp thoi Save File As xut hin, nhn Save. Sau 1 thi gian ch i c nhng hp thoi sau xut hin. trong hp thoi Link Footprint to Component thng bo cho bit khng tm thy chn mch in ca R1 ca in tr R2.V th phi tm chn cho linh kin bng cch nhp chut vo Link existing footprint to component

Hp thoi Footprint for R2 xut hin, ti khung Libraries chn mc Jumper, ti Footprint nhp chn mc Jumper 200 chn chn mch in cho R2. Chn xong nhn OK.

Lm tng t vi cc linh kin cn li. Sau khi chn chn cho cc linh kin ta c s mch in sau:

Tin hnh sp xp linh kin. khng b gii hn bi khung mch in c sn ta nhp chut vo biu tng Reconnect Mode trn thanh cng c. Sau khi nhp chut ta c hnh nh sau:

Sau khi sp xp v chnh sa, ta c hnh sau:

v khung gii hn cho mch nhp chut vo biu tng Obstacle Tool trn thanh cng c v v gii hn.

Nhp chut phi vo mch v chn End Command thot khi lnh ny. chn lp cho chng trnh chy mch in nhp chut vo biu tng View Spreadsheet trn thanh cng c. mt ca s xut hin nhp chn Startegy > Route Layer

Hp thoi Route Layer xut hin, nhp chn cc mc trong ct Enabled l BOTTOM, INNER1, INNER2. Chn xong nhp chut phi chn Properties.

Hp thoi Edit Layer Strategy xut hin, nhp b mc Rounting Enabled. Xong nhn OK.

chng trnh t ng chy mch in bng cch chn Auto > Autoroute > Board.

Ch chng trnh chy mch in n khi c thng bo nhn OK ta c mch in nh sau

Sau Save li.

Kt Lun Sau mt tun thc tp, em hon thnh c mch in trn v hn ht l em nm bt c nhng kin thc c bn nht ch to mt mch in t trn my tnh in t bng phn mm thit k Orcad 9.2. y l tin em c th thit k nhng mch in phc tp hn, v c nhiu ng dng thc tin hn sau ny. Mt ln na em xin chn thnh cm n thy tn tnh hng dn em.