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HNG DN C BN ORCAD PCB EDITOR 16.5

PART 2. V MCH IN (LAYOUT)

1. To khun mu

- Khun mu (tempalate) nh ngha mt s thuc tnh mc nh cho mch in trong qu trnh layout (trong c board outline ng bao mch). C th b qua bc ny,

cc thuc tnh v v ng bao mch s c thc hin trong qu trnh layout, tuy

nhin y l phng n gip tit kim thi gian khi thit k nhiu mch in c chung

mt s thuc tnh - Khi ng Orcad PCB Editor (Start All Programs Cadence Release 16.5

Orcad PCB Editor)

- Chn File New,

- Trong hp thoi m ra, chn Board

(wizard) trong khung Drawing Type

- Trong khung Drawing Name, t tn

cho khun mu v nhn Browse

chn th mc lu, gi s t tn cho

khun mu l template1.brd v lu

vo th mc C:/my_template

- Nhn OK

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- Trong hp thoi tip theo nhn Next,

n giao din nh hnh v

- Chn n v thit k ( y l

Milimeter), kh giy (A1)

- Nhn Next

- Trong giao din nh hnh v, chn

khong cch gia cc ng li,

s lp mch in

- Nhn Next

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- Trong giao din tip theo ta s thy

mch in bao gm 2 lp l lp TOP

v BOTTOM, v kiu mc nh l

Routing layer (lp i dy)

- Nhn Next

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- Ti giao din nh trn, thit lp rng cc cnh khun mu, khong cch gia cc

cnh, khong cch gia cc cnh vi l khoan v khong cch gia cc l khoan vi

nhau

- Chn padstack cho cho chn l khoan, nhn ng dn trong khung Default via

padstack, gi s chn padstack via, nhn OK Next

- Trong giao din nh hnh v

chn kiu ng bao cho

mch in

- Chn Circular board cho

kiu ng trn v

Rectangular board cho kiu

bo mch hnh ch nht

- Nhn Next

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- Trong giao din nh hnh v,

thit lp cc thng s v kch

thc ng bao mch, khong

cch t cc ng i dy v linh

kin n cnh ng bao

mch.

- Nhn Next

- Trong giao din tip theo, nhn

Finish

- Ta c khun mu c to ra

nh hnh v bn

- C th cn chnh rng cc

cnh, mu,.theo tng yu cu

thit k

- Chn File Save lu li

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2. Thit lp ng dn n th vin footprint

- Chn Setup User Preferences, hp thoi User Preferences Editor hin ra. Trong cy

th mc bn tri click chut chn th mc Library nh hnh v

- Trong khung giao din ca th mc Library bn phi, ti ct Value, click vo nt

u tin tng ng vi ng dn devpath trong ct Preference, hp thoi

devpath Items hin ra:

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- Click vo nt chn ng

dn n th mc cha th vin

footprint cn thm vo

- Th vin footprint c trong b ci

t ca Orcad c mc nh c sn

ti y

- Lm tng t, ln lt vi cc dng

bn di ca ct Preference bng

cch nhn vo cc nt tng

ng trong ct Value

- Nhn Apply OK

- Chn Place Manually, hp thoi Placement m ra

- Ti tab Advanced

Settings b du tch ti

Database v chn tch ti

Library

- Ti tab Placement List chn Package symbols, danh sch cc footpfrint ca cc th

vin thm vo hin ra, t cc footprint ln bn thit k click chut vo ln lt

cc footprint (t du tch ti cc ) v click ln cc v tr mong mun trn bn v

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3. Thit k mch in t s nguyn l - Trc tin ta c s nguyn l nh hnh v, thit k trang page1 trong project

test1

- Trong v d ny, ta s thit k mch in n gin gm 2 lp l TOP v BOTTOM, i

dy lp TOP,

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- Gn footprint cho cc linh kin: click chut tri khoanh vng s nguyn l, click

chut phi Edit Properties, hp thoi Property Editor m ra nh hnh v:

- Ti ct PCB Footprint, in tn cc footprint tng ng thch hp trong th vin

footprint cho tng linh kin

- To Netlist (cc kt ni): Tr li cy th mc qun l project, click chut tri chn

PAGE1

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- Chn Tools Create Netlist, hp thoi sau m ra:

- Thit lp cc thng s nh

hnh v

- Trong khung thoi Options,

mc Input Board File, chn

ng dn n khun mu

to trn (bc ny c

th b qua). Trong mc

Output Board File, chn

th mc lu thit k

- Click chut ln lt vo cc

Create or Update PCB

Allow Etch Open

Board in Allegro.

Nhn OK

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- Giao din Allegro PCB s t khi ng vi ng bao khun mu t to chn

bc trn:

- Thit lp thng s v ng li, chn Setup Design Parameters

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- Trong khung Grids, click chut tri chn Grids on, nhn biu tng ca Setup

Grids, hp thoi Define Grid m ra, c th thit lp cc thng s ca ng li nh

hnh v

- Tip theo, ta t cc footprint chn ln thit k, chn Place Manually, hp thoi

Placement m ra, click chut chn tt c cc linh kin v click ln lt ln cc v tr

thch hp trn thit k

- C th n cc ng dy cho ri mt, chn Display Blank Rats All, hin

ng dy chn Display Show Rats All

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- dch chuyn, xoay, cc

linh kin, ta khoanh vng linh

kin click chut phi vo

linh kin Move, sau di

chuyn n v tr thch hp,

trong qu trnh di chuyn,

mun xoay hay lt linh kin,

click chut phi

Rotate/Mirror, dng chut

xoay, lt linh kin

- Tip theo ta i dy gia cc linh kin, click chn biu tng Add Connect

thanh cng c pha bn tri mn hnh

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- Click chut vo 1 chn linh kin bt k v r chut i dy ln lt n cc chn

linh kin ni vi n, sau click chut vo chn linh kin kia kt thc i dy

- Nh hnh v, ta i dy

cho mch trn trong 1 lp

l lp TOP

- Chnh rng cho cc

ng dy bng cch click

chut phi vo ng dy

Change Width G gi

tr thch hp vo Enter

Width

- Tip theo ta ph ng cho lp TOP, chn Shape Rectangular

- Trong khung thoi Options bn

phi, chn lp Etch/Top, trong

mc Shape Fill mc nh kiu

Dynamic copper trong khung type

- R chut v ng bao hnh ch

nht quanh cc linh kin, sau khi

v xong s c kt qu nh hnh

v

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- Ph ng cho lp BOTTOM, lm tng t, trong khung Options chn Etch/Bottom,

r chut v ng bao ln ng bao c lp TOP, ta c kt qu nh hnh v

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- Chn Setup Outlines Board Outline chnh sa ng bao t khun mu hoc

to mi ng bao khi khng dng khun mu

- Trong khung Options bn phi ta thy ng bao c t trong lp Outline, c mu

vng trong gi Board Geometry, trong hp thoi Board Outline ta c cc ty chn

Create (to mi), Edit (chnh sa), Move (dch chuyn), Delete (xa), thng s v

rng ng bao trong khung Board Edge Clearance, bn di l cc ty chn v

ng bao (v theo hnh ch nht, v tng cnh,.).

V d chn Create (to mi ng bao), rng cnh ng bao l 0.8 mm, kiu v

theo hnh ch nht (Draw Rectangle), r chut bao quanh linh kin nh hnh v

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- Ta c ng bao hon thnh mu vng, nhn Apply OK, c th dng ty chn

Edit chnh sa li cc thng s ca ng bao

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- Hnh nh ng bao sau khi v xong

bng cng c Board Outline

- Nh vy v c bn ta c cc bc thit k mt mch in n gin, cch thit k

cc mch in phc tp (nhiu linh kin, nhiu lp) s c tm hiu dn trong qu trnh

lm mch thc t