Te Papa Huringa Taarua (PCB), e mohiotia ana ko Printed Circuit Board (PCB), e whakamahia ana hei hono me te mahi i nga waahanga hiko a he waahanga nui tera mo te hoahoa Hiko hiko. Ma tenei tuhinga e whakaatu nga ture taketake o te whakatakotoranga PCB me nga waea waea.

Taipitopito nga ture taketake o te whakatakotoranga poari PCB me nga waea waea

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. Ko nga waahanga, taputapu me te kopere kaua e whakauruhia ki roto i te 3.5mm (mo te M2.5) me te 4mm (mo te M3) huri noa i nga kohao kore-whakauru penei i nga kohao whakanoho me nga kohao paerewa i roto i te 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. Ko te waahanga o waho o te waahanga 5mm te tawhiti mai i te pito o te pereti;

5. Ko te tawhiti i waenga i te taha o waho o te papa o te waahanga whakauru me te taha o waho o te waahanga whakauru whakauru he nui ake i te 2mm;

6. Ko nga waahanga anga maitai me nga waahanga whakarewa (pouaka whakangungu, me etahi atu) kaore e pa ki etahi atu waahanga, kaore e tata ki te raina taarua, papa, kia nui ake te mokowhiti i te 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. Ko nga waahanga whakamahana kia kaua e tata ki nga waea me nga waahanga wera; Ko nga taputapu wera-teitei kia tika te tohatoha;

8. Me whakarite te turanga hiko huri noa i te papa taarua tae atu ki te waa e taea ana, me te taura waea waea o te turanga hiko me te paepae hono ki a ia me whakarite i te taha ano. Ina koa, kaua e whakanohohia nga hiko hiko me etahi atu hononga hono i waenga i nga hononga ki te whakahaere i nga hononga o enei turanga me nga hononga me te hoahoa me nga waea waea hiko. Ko te mokowhiti o nga turanga hiko me nga hononga honohono kia whakaarohia kia pai ai te whakauru me te tango i nga puru hiko;

9. Te whakatakotoranga o etahi atu waahanga:

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. Kaore e whakaaetia te raina tohu nui kia haere i waenga i te waewae turanga;

12, taapiri te whakaurunga takitahi, te ahunga o te tangata e rite ana, te ahunga takai rite.

13. Ko nga taputapu Polar me tohu ki te ahunga kia taea ki runga i te papa kotahi.

E rua, nga waahanga waea waea waahanga

1. Tuhia te waahanga waea waea kei roto i te rohe ≤1mm mai i te mata o te poari PCB, ana i roto i te 1mm huri noa i te kohao whakapiri, a me te aukati i nga waea waea;

2. Ko te raina hiko whanui tonu, kaua e iti iho i te 18mil; Ko te whanui raina tohu kaua e iti iho i te 12mil; CPU incoming and outgoing lines should not be less than 10mil (or 8mil); Mokowā raina kaua e iti iho i te 10mil;

3. Ko te kohao noa kaore e iti iho i te 30mil;

4. Raina taapiri whakauru: papa 60mil, puka 40mil;

1 / 4W ātete: 51 * 55mil (0805 pepa); Papa whakauru tika 62mil, tuwhera 42mil;

Kaitautoko-kore: 51 * 55mil (pepa 0805); Papa whakauru tika 50mil, tuwhera 28mil;

5. Kia mahara ko nga taura hiko me nga taura whenua kia tuwhera a tae noa atu ki te waa e taea ana, kaua hoki e herea nga taura tohu.

Me pehea te whakapai ake i te aukati anti-pokanoa me te hototahi hiko?

Me pehea te whakapai ake i te aukati anti-pokanoa me te hototahitanga o te hiko i te wa e whakawhanake ana i nga hua hiko me te tukatuka?

1. Ko etahi o nga punaha e whai ake nei me aro nui ki te aukati anti-hiko.

(1) he tino teitei te auau karaka karaka, he tere te huringa pahi.

(2) Kei roto i te punaha te kaha-nui, te hiko taraiwa teitei o te waa, penei i te mura whakaputa i te tarai, te pana nui o te waa, etc.

(3) punaha me te hiko taiawhio tohu tairitenga ngoikore me te huringa hurihanga A / D tino tika.

2. Ko nga mahi e whai ake nei ka whakapiki ake i te aukati aukati anti-hiko i te punaha:

(1) Tohua te microcontroller me te auau iti:

Ma te miihini iti me te iti o te karaka o waho e pai te whakaiti i te haruru me te whakapai ake i te aukati o te punaha ki te aukati. Te ngaru tapawha me te ngaru sine me te rite o te waa, ko te waahanga nui o te ngaru tapawha he nui ake i te ngaru hine. Ahakoa ko te kaha o te waahanga nui o te ngaru tapawha he iti ake i te ngaru taketake, ka piki ake te auau, ka maamaa ake te whakaputa ka waiho hei putake haruru. Ko te haruru auau nui whakaharahara i whakaputahia e te microcontroller mo te 3 wa o te huringa karaka.

(2) Whakaitihia te rereketanga o te whakawhiti tohu

Ko nga Microcontrollers e hangaia ana e te hangarau CMOS tere-tere. 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, Whakanuia te haruru o te punaha. A, no te Tpd “Tr”, ka raru ke i te raina whakawhiti, me whakaaro ki te whakaata tohu, te haangai me te aha.

Ko te wa roa o te tohu i runga i te papa taarua e pa ana ki te aukati o te arahi, ara, ki te hiko dielectric o te papa poari taarua. Ka taea te whakaaro maatau ki te tohu haere i waenga i te 1/3 me te 1/2 te tere o te marama i runga i nga arataki PCB. Ko te Tr (wa roa whakaroa) o nga waahanga waea arorau e whakamahia ana i roto i nga punaha e hangaia ana i nga microcontrollers kei waenga i te 3 me te 18n.

I runga i te papa hiko iahiko, ka haere te tohu ki te parenga 7W me te mata 25cm, me te roa-roa-te-raa-4-ki te 20ns. That is to say, the signal on the printed line lead as short as possible, the longest should not exceed 25cm. Ana kia iti ake te maha o nga kohao, ko te mea pai kaua e neke ake i te 2.

A, no te tere atu o te wa tiimata mai i te wa whakaroa tohu, ka whakamahia nga hiko tere. I tenei wa, me whakaarohia te taarua o te raina whakawhiti. Mo te tuku tohu i waenga i nga poraka whakauru i runga i te papa huringa PRINTED, me karohia a Td Trd. Ki te nui ake te papa ara iahiko, ka tere kaore te punaha e tere.