Orcad 3 - Tao Chan Linh Kien Moi Trong Layout

V mch in vi Layout

BI 3: TO CHN LINH KIN (FOOTPRINT) MI bi trc khi chn chn linh kin nu ta khng tm thy chn linh kin no ph hp ta c th b qua bng cch bm nt Cancel. Sau ta c th t to linh kin mi bng cch m Layout ln, vo menu Tools Library manager

Bin son: Cao Nguyn Khoa Nam - [email protected]

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V mch in vi Layout

Library manager to chn linh kin mi bn bm Create New Footprint

hp thoi to chn linh kin mi Nhp tn linh kin mi mc Name of footprint, v d l TRANSITOR. Bm OK.


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V mch in vi Layout

Thm cc chn linh kin vo bng cch chn cng c Pin tool. Chut phi vo nn en, chn New t chn mi v tr thch hpPin tool Text tool


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V mch in vi Layout

Sau chn Text tool xa bt cc ch khng cn thit i, ch li &Comp v &Value. Nhp vo text cn xa v bm phm Delete (trn bn phm).

Chn thuc tnh cho 2 text cn li bng ko chut bi n, xong bm chut phi, chn Properties (phm tt Ctrl+E)


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V mch in vi Layout

Chn Layer l SSTOP. OK. Cc thuc tnh khc ca Text c hng dn nh cui bi 2.

Ngoi ra ta cn c th v thm cc ng bao (Obstacle) cho linh kin. Thng ta chn ng bao ny nm lp SSTOP, tc thuc tnh Obstacle Layer l SSTOP.


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V mch in vi Layout

Bn c th chnh sa kch thc, hnh dng ca cc PAD (chn linh kin) nh sau: Chn cng c Pin tool, bi cc chn cn chnh sa


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V mch in vi Layout

Chn Padstack

Chn kch thc v hnh dng ca PAD bng cch chn nhp i vo PAD


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V mch in vi Layout

Chn Pad shape l hnh trn(round), hnh vung(square), hnh Oval, hnh ch nht Thay i kch thc bng cch thay i Pad Width, Pad Height Mt s li khuyn v chn kch thc ca chn linh kin nh sau: Vi cc linh kin thng nh in tr, t, diode ta chn chn hnh trn (Round), ng knh l 1.8 n 2.1, ty loi linh kin Chn 1 ca IC hay cc linh kin c cc tnh nh t hoc diode ta nn chn kiu chn l hnh vung hoc hnh ch nht Vi IC ta nn chn chn hnh Oval (vi cc chn 2 tr ln) v hnh ch nht (i vi chn 1). Kch thc thng l 1.7mm Width v 2.2 mm Height. Vi cc chn linh kin to nh chn ca cc JACK cm, chn ca IC c cn th nn chn b Width(b ngang) to ra mt t, c 1.8mm Mt iu na l khi i dt mch in bng my cc c s lm mch in th cc lp cn quan tm l lp TOP, BOTTOM, SSTOP, v 2 lp t kch thc l khoan l lp DRLDWG v DRILL. Lp l khoan nu ta khng t ng th khi lp mch s khng cho vo lt c. L mch in ny l l xuyn nu dng khoan doa ra th mt trn v mt di s khng ni vi nhau na, hng mch, khc phc rt kh khn. Kch thc ln nht ca l khoan nn bng kch thc ca chn linh kin (PAD) 0.6mm.


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V mch in vi Layout


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V mch in vi Layout

Sau khi chnh sa xong, ta lu li bng cch bm nt Save

Trong hp thoi Save Footprint As - Mc Name of Footprint ta nn i tn li cho ph hp, d nh. Vd nh TRANSITOR, TU, TRO hoc l tn linh kin lun chng hn. - mc Name of library ta chn tn th vin cn lu, v d nh THU VIEN TU TAO. Xong bm Open.


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V mch in vi Layout

Vi cc chn linh kin khc bn cng to tng t v cng chn Name of library l THU VIEN TU TAO nh lc ny. Mt mo nh y l cc bn nn lt qua b th vin c sn ca Orcad ly nhng th vin c sn sa li cho ph hp ri Save as , i tn ty thch v chon th vin lu v l THU VIEN TU TAO ca mnh tit kim cng sc. Cc b th vin c sn ca Orcad cn dng thng l Th vin DIP100T cha cc chn linh kin cho IC t 4 chn n 48 chn. TM_AXIAL cha cc chn linh kin cc c ca in tr. TM_CYNL cha cc chn linh kin cc c ca t in (kiu ng) hay LED TO cha cc chn linh kin cho cc loi transitor, cc loi IC n p RELAY cha chn linh kin ca cc loi rle. Khi chn kch thc ca cc chn linh kin bn nn koBin son: Cao Nguyn Khoa Nam - [email protected] Trang 11

V mch in vi Layout

Mt mo na l khi chn hnh dng v kch thc cho chn linh kin bn nn ko ca s Padstacks sang mt bn (nh hnh) khi bn nhp vo dng no th chn linh kin tng ng s sng ln, iu ny gip d nhn bit ta ang chnh sa cho nhng chn no. Nh trn hnh chn 1 sng ln khi ta nhp vo dng TOP. Phn chnh sa kch thc v hnh dng ca chn linh kin cng c p dng tng t khi v layout chnh sa chn linh kin.


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Orcad 3 - Tao Chan Linh Kien Moi Trong Layout