Lolomi Komiti Faatino matagaluega (PCB), e taʻua foi o le Printed Circuit Board (PCB), e faʻaaogaina e faʻafesoʻotaʻi ma faʻaogaina vaega eletise ma o se vaega taua o le mamanu Circuit design. O lenei tusiga o le a faʻalauiloaina tulafono faʻavae o le PCB faʻatulagaina ma uaea.

Fa’amatalaga tulafono fa’avae o le fa’atulagaina o laupapa PCB ma uaea

Basic rules of component layout

1. According to the layout of circuit modules, the related circuit to achieve the same function is called a module, the components in the circuit module should adopt the principle of nearby concentration, and the digital circuit and analog circuit should be separated;

2. O vaega, masini ma sikulima e le tatau ona faʻapipiʻiina i totonu ole 3.5mm (mo le M2.5) ma le 4mm (mo le M3) faʻataʻamilo i pu e le faʻapipiʻiina e pei o pu faʻatulagaina ma pu masani i totonu ole 1.27mm;

3. Horizontal resistance, inductor (plug-in), electrolytic capacitor and other components under the cloth hole, so as to avoid the wave soldering hole and component shell short circuit;

4. O le pito i fafo o le vaega o le 5mm ese mai le pito o le ipu;

5. O le mamao i le va o le pito i fafo o le paʻu o le elemene faʻapipiʻi ma le pito i fafo o le faʻapipiʻi faʻapipiʻi e sili atu nai lo le 2mm;

6. uamea atigi vaega ma uʻamea vaega (talipupuni pusa, ma isi) le mafai ona paʻi i isi vaega, e le mafai ona latalata i le lolomi laina, pad, o le va e tatau ona sili atu nai lo 2mm. The size of positioning holes, fastener mounting holes, elliptic holes and other square holes in the plate is greater than 3mm from the plate side;

7. E le tatau ona latalata i mea e faʻavevela ai uaea ma elemeni vevela; O masini vevela maualuga e tatau ona tufatufa tutusa;

8. E tatau ona fa’ata’amilo le so’o eletise i luga o le laupapa lolomi i le mamao e mafai ai, ma o le laina fa’amau o le socket eletise ma le busbar e feso’ota’i i ai e tatau ona fa’atulaga i le itu e tasi. Aemaise lava, aua ne’i tu’u ni sockets ma isi so’o fa’apipi’i i le va o so’o e faafaigofie ai le ueloina o nei sockets ma connectors ma le mamanu ma uaea o uaea eletise. O le va o sockets ma so’oga uelo e tatau ona mafaufauina e faafaigofie ai le faaofiina ma le aveeseina o palaka eletise;

9. Fa’atulagaina o isi vaega:

All IC components should be aligned unilaterally, and polarity marks of polar components should be clear. Polarity marks on the same printed board should not be more than two directions. When two directions appear, the two directions should be perpendicular to each other.

10, the surface wiring should be properly dense, when the density difference is too large should be filled with mesh copper foil, the grid is greater than 8mil (or 0.2mm);

11, the patch pad can not have through holes, so as to avoid the loss of solder paste resulting in virtual welding components. O laina faailo taua e le faatagaina e ui atu i le socket foot;

12, patch unilateral alignment, faasinoga amio faifaipea, tulaga afifiina faifaipea;

13. Polar masini e tatau ona makaina i le auala e tasi i le mamao e mafai ai i luga o le laupapa e tasi.

Lua, tulafono o uaea vaega

1. Tusi le vaega uaea i totonu o le eria ≤1mm mai le pito laupapa PCB, ma i totonu o le 1mm faataamilo i le pu faapipiiina, ma faasaina uaea;

2. O le laina eletise i le lautele e mafai ai, e le tatau ona itiiti ifo i le 18mil; O le lautele o le laina faʻailo e le tatau ona i lalo o le 12mil; CPU incoming and outgoing lines should not be less than 10mil (or 8mil); Ole va ole laina ole itiiti ifo ile 10mil;

3. O le pu masani e le itiiti ifo i le 30mil;

4. Fa’aofi laina fa’alua: pad 60mil, avanoa 40mil;

1 / 4W tetee: 51 * 55mil (0805 pepa); Tu’u sa’o pad 62mil, avanoa 42mil;

Capacitor lē polar: 51 * 55mil (0805 lau); Tu’u sa’o pad 50mil, avanoa 28mil;

5. Ia maitauina o uaea eletise ma uaea eleele e tatau ona fa’asalaina i le mamao e mafai ai, ma e le tatau ona ta’amilo uaea faailo.

E faʻafefea ona faʻaleleia le mafai ona faʻalavelave faʻalavelave ma fesoʻotaʻiga electromagnetic?

Faʻafefea ona faʻaleleia le teteʻe i le faʻalavelave gafatia ma le electromagnetic ogatasi pe a atiaʻe mea faʻaeletoroni ma masini gaosi?

1. O nisi o faiga o lo’o taua i lalo e tatau ona fa’atatau i le fa’alavelave fa’afefe-eletise:

(1) ole taimi ole uati microcontroller e sili ona maualuga, o le taamilosaga o pasi e sili ona vave.

(2) O le faiga e aofia ai maualuga-paoa, maualuga-taimi ave taʻavale, e pei o aloiafi faatupuina moligafua, maualuga-taimi nei ki, ma isi

(3) faiga faʻatasi ma le faʻamalo vaivai faʻailoga faʻailoga ma le maualuga maualuga A / D faʻaliliuga faʻaliliuga.

2. O faiga nei o lo’o faia e fa’ateleina ai le fa’alavelave fa’alavelave fa’aeletise ole fa’aogaina ole faiga:

(1) Filifili microcontroller e maualalo le taimi:

O le microcontroller ma maualalo le uati taimi masani e mafai ona faʻaititia lelei leo ma faʻaleleia le teteʻe-faʻalavelave gafatia o le polokalama. O le galu sikuea ma le galu faʻatasi ma le taimi tutusa, o le vaega maualuga o le galu sikuea e sili atu nai lo le galu. E ui lava o le amplitude o le vaega maualuga o le galu sikuea e laʻititi nai lo le galu faʻavae, o le maualuga o le taimi, o le faigofie foi lea ona faʻaosoina ma avea ma puna o le pisa. O le pisapisao maualuga e sili ona a’afia e gaosia e le microcontroller e tusa ma le 3 taimi ole taimi ole uati.

(2) Faʻaitiitia le faʻaseseina i faʻailo faailo

Microcontrollers e masani lava ona gaosia e le televave CMOS tekinolosi. Static input current signal input at about 1 ma, around ten pf in the input capacitance, high input impedance, high speed CMOS circuit outputs are fairly on load capacity, namely the considerable output value, the output end of a door through a very long lead to the high input, the input impedance reflection problem is very serious, it will cause the signal distortion, Fa’ateleina le pisa o le tino. A oʻo i le Tpd “Tr”, e avea ma faʻafitauli laina faʻasalalau, e tatau ona mafaufau i le faʻaaliga o le faailo, faʻatusatusaga faʻalavelave ma isi.

O le tuai taimi o le faʻailoga luga o le lolomi laupapa e fesoʻotaʻi ma le uiga faʻafitauli o le taʻimua, o lona uiga, i le dielectric tumau o le lolomi laupapa mea. Fa’ailoga e mafai ona fa’atatau e fealua’i i le va o le 1/3 ma le 1/2 le saoasaoa o le malamalama i luga o ta’ita’i PCB. O le Tr (taimi fa’atuai masani) o elemene telefoni e masani ona fa’aogaina i faiga e faia i microcontrollers i le va o le 3 ma le 18ns.

I luga o le lolomi laupapa matagaluega, o le faʻailoga pasi i totonu o le 7W resistor ma le 25cm lead, ma le on-line tolopo e tusa o le 4 i le 20ns. That is to say, the signal on the printed line lead as short as possible, the longest should not exceed 25cm. Ma o le numera o pu e tatau ona laʻititi pe a mafai, e sili atu nai lo le 2.

A o’o i luga ole fa’ailoga taimi e vave atu nai lo le fa’ailoga taimi fa’atuai, fa’aoga eletise vave. I le taimi nei, e tatau ona mafaufauina le fetaui lelei o le laina eletise. Mo le fa’asalalauina o fa’ailo i le va o poloka tu’ufa’atasia i luga o se laupapa fa’asalalau, Td Trd e tatau ona ‘alofia. O le tele o le laupapa matagaluega lolomi, o le saoasaoa o le faiga e le mafai ona vave tele.