1.PCB non insulated casing wir窗妹e and other wire dist子用ance of at least自子 2.2 mm. This applies to睡花 all objects connected to the chassi說近s ground, including trajectory.
2 chassis wire l子地ength should not be more tha體物n five times its width.
Metal objects 3 the 綠白circuit without insulation and錢金 the operator ca我對n touch to the PCB area o他紅r ungrounded separa和術ted by at least 2 cm.
4 power line and ground wire or ran村身king on PCB and in the same layer遠也, or placed adjacent to the小科 two layer.
5 the ground plane and gro紅愛und wire must be connecte商兒d to the network. In an 日跳arbitrary direction, at least 6 c制南m every connection a vertical l時唱ine and horizontal男司 line. Especially the double老你 PCB plate, tha化相t is to say, the看錯 first layer PCB board lay錢遠out can be groun個作d level, and the second l校視ayer can be vertical 請作ground, must be at least ev數購ery 6 centimeters place a 可購hole has been connected土自 to both (of course, less than 6 cm唱街 in the local conne街資ction is better than the gro去自und grid, ground plane.
) 6 of all signal lines購答 must be in the ground plane edges or報相 less than 13 mm above the groun文內d. Wire can be distr學藍ibuted in the same layer signal line,照他 also can be in 為會the next layer. If the signal又器 line length of 30 cm or more, it書刀 must be placed on a ground bes南錢ide it, placed above the signal line音吧 or the adjacent surface of the grou工術nd can be.
Across the bypass務理 capacitor between the 7 哥我power line and the ground wire, the di們懂stance between e都線ach other is not藍地 greater than 8 cm (so that e光動ach piece of integrated block may h錯市ave multiple bypass capacitor請作 is connected).
8 mutual connection more co購多mponents rely on t南生ogether.
All 9 components must錢筆 be as close as 那讀possible to the I/O connector (Note: 書學should meet third).
The 10 part will spare all of PCB fil她著led with ground (attention錢對 should be paid to every 6 centimeters 慢習place continuou唱請sly to produce gr那分ound network).
11 if possible, whi體能ch will feed powe上生r line or signal line from the 農廠edge at the center of PCB boar開費d, and not from a從唱 corner out.
12 for the signal line is particu票化larly sensitive an草歌d long (30 cm or吃電 longer), should be at regula微時r intervals and ground.
Note: these design rules must be ap水呢plied to all PCB in t船間he system (such as main board 弟章and plug in the above board)秒舊. For example, when the appli木分cation of article se厭錢cond, a ground length 長農including the motherboard and th匠工e daughter board and the length 快少of all the earth.
