PCB Layout Design Considerations

Txhawm rau pab txhawb kev tsim khoom, PCB stitching feem ntau yuav tsum tsim Mark point, V-slot, txheej txheem ntug.

I. Cov duab ntawm daim ntawv sau

1. Sab nrauv ntawm PCB splicing board (clamping edge) yuav tsum tau kaw-voj tsim los xyuas kom meej tias PCB splicing board yuav tsis deformed tom qab nws yog tsau rau ntawm lub fixture.

2. PCB splice dav ≤ 260mm (SIEMENS kab) los yog ≤ 300mm (FUJI kab);Yog tias tsis siv neeg xa khoom yuav tsum tau, PCB splice dav x ntev ≤ 125 hli x 180 hli.

3. PCB splicing board zoo li ze rau lub square li sai tau, pom zoo 2 × 2, 3 × 3, …… splicing board;tab sis tsis txhob sau rau hauv yin thiab yang board.

II.V-qhov

1. Tom qab qhib V-qhov, qhov seem thickness X yuav tsum yog (1/4 ~ 1/3) board thickness L, tab sis qhov tsawg kawg nkaus thickness X yuav tsum ≥ 0.4mm.Lub sab sauv txwv ntawm lub hnyav load-bearing board yuav tsum tau coj, lub qis txwv ntawm lub lighter load-bearing board.

2. V-slot ntawm ob sab ntawm lub sab sauv thiab qis qis ntawm cov misalignment S yuav tsum tsawg dua 0.1mm;vim qhov tsawg kawg nkaus zoo thickness ntawm cov kev txwv, lub thickness ntawm tsawg tshaj li 1.2 hli board, yuav tsum tsis txhob siv V-slot spell board txoj kev.

III.Mark point

1. Teeb tsa qhov taw qhia qhov chaw siv, feem ntau nyob rau hauv qhov chaw taw tes nyob ib ncig ntawm qhov tawm ntawm 1.5 hli loj dua nws qhov chaw uas tsis yog-resistant soldering.

2. Siv los pab kho qhov muag qhov chaw ntawm lub tshuab tso kawm muaj ib tug nti ntaus ntawv PCB board kab pheeb ces kaum tsawg kawg yog ob asymmetric siv cov ntsiab lus, tag nrho cov PCB optical positioning nrog rau qhov taw tes siv feem ntau nyob rau hauv tag nrho PCB kab pheeb ces kaum coj txoj hauj lwm;daim ntawm PCB optical positioning nrog rau qhov siv taw tes yog feem ntau nyob rau hauv daim ntawm PCB kab pheeb ces kaum coj txoj hauj lwm.

3. rau txhuas qhov sib txawv ≤ 0.5mm QFP (square ca pob) thiab pob qhov sib nrug ≤ 0.8mm BGA (pob daim phiaj array pob) cov khoom siv, txhawm rau txhim kho qhov kev tso kawm qhov tseeb, qhov yuav tsum tau muaj ntawm IC ob kab pheeb ces kaum ntawm cov ntsiab lus siv.

IV.Cov txheej txheem ntug

1. Lub sab nrauv ntawm lub rooj tsavxwm patching thiab lub rooj tsavxwm me me, lub rooj tsavxwm me me thiab lub rooj tsavxwm me me nruab nrab ntawm qhov kev sib txuas ntawm qhov ze ntawm lub cuab yeej tsis tuaj yeem yog cov khoom loj los yog protruding, thiab cov khoom siv thiab cov ntug ntawm PCB lub rooj tsavxwm yuav tsum tau sab laug nrog ntau tshaj. 0.5mm ntawm qhov chaw kom ntseeg tau tias kev ua haujlwm zoo ntawm cov cuab yeej txiav.

V. board positioning qhov

1. rau PCB qhov chaw ntawm tag nrho lub rooj tsavxwm thiab rau qhov chaw ntawm cov khoom siv zoo-pitch benchmark cim, nyob rau hauv txoj cai, ib lub suab ntawm tsawg dua 0.65mm QFP yuav tsum tau teem rau hauv nws txoj kab pheeb ces kaum;PCB subboard positioning benchmark cim yuav tsum tau siv nyob rau hauv ua khub, teem rau ntawm kab pheeb ces kaum ntawm positioning ntsiab.

2. Cov khoom loj yuav tsum tau sab laug nrog rau qhov chaw los yog qhov chaw qhov, tsom rau xws li I / O interfaces, microphones, roj teeb interfaces, microswitches, headphone interfaces, motors, thiab lwm yam.

Tus tsim qauv PCB zoo, hauv kev tsim qauv sib koom ua ke, los txiav txim siab txog cov khoom tsim tawm, los pab txhawb kev ua haujlwm, txhim kho kev tsim khoom thiab txo cov nqi tsim khoom.