PCB LAYOUT 術(shù)語(yǔ)解釋(TERMS)1. COMPONENT SIDE(零件面、正面)︰大多數(shù)零件放置之面。2. SOLDER SIDE(焊錫面、反面)。3. SOLDER MASK(止焊膜面)︰通常指Solder Mask Open 之意。4. TOP PAD︰在零件面上所設(shè)計(jì)之零件腳PAD,不管是否鑽孔、電鍍。5. BOTTOM PAD:在銲錫面上所設(shè)計(jì)之零件腳PAD,不管是否鑽孔、電鍍。6. POSITIVE LAYER:?jiǎn)巍㈦p層板之各層線路;多層板之上、下兩層線路及內(nèi)層走線皆屬之。7. NEGATIVE LAYER:通常指多層板之電源層。8. INNER PAD:多層板之POSITIVE LAYER 內(nèi)層PAD。9. ANTI-PAD:多層板之NEGATIVE LAYER 上所使用之絕緣範(fàn)圍,不與零件腳相接。10. THERMAL PAD:多層板內(nèi)NEGATIVE LAYER 上必須零件腳時(shí)所使用之PAD,一般稱為散熱孔或?qū)住?1. PAD (銲墊):除了SMD PAD 外,其他PAD 之TOP PAD、BOTTOM PAD 及INNER PAD 之形狀大小皆應(yīng)相同。12. Moat : 不同信號(hào)的 Power& GND plane 之間的分隔線13. Grid : 佈線時(shí)的走線格點(diǎn)2. Test Point : ATE 測(cè)試點(diǎn)供工廠ICT 測(cè)試治具使用ICT 測(cè)試點(diǎn) LAYOUT 注意事項(xiàng):PCB 的每條TRACE 都要有一個(gè)作為測(cè)試用之TEST PAD(測(cè)試點(diǎn)),其原則如下:1. 一般測(cè)試點(diǎn)大小均為30-35mil,元件分布較密時(shí),測(cè)試點(diǎn)最小可至30mil.測(cè)試點(diǎn)與元件PAD 的距離最小為40mil。2. 測(cè)試點(diǎn)與測(cè)試點(diǎn)間的間距最小為50-75mil,一般使用75mil。密度高時(shí)可使用50mil,3. 測(cè)試點(diǎn)必須均勻分佈於PCB 上,避免測(cè)試時(shí)造成板面受力不均。4. 多層板必須透過(guò)貫穿孔(VIA)將測(cè)試點(diǎn)留於錫爐著錫面上(Solder Side)。5. 測(cè)試點(diǎn)必需放至於Bottom Layer6. 輸出test point report(.asc 檔案powerpcb v3.5)供廠商分析可測(cè)率7. 測(cè)試點(diǎn)設(shè)置處:Setuppadsstacks
標(biāo)簽: layout design pcb 硬件工程師
上傳時(shí)間: 2013-11-17
上傳用戶:cjf0304
LAYOUT REPORT .............. 1 目錄.................. 1 1. PCB LAYOUT 術(shù)語(yǔ)解釋(TERMS)......... 2 2. Test Point : ATE 測(cè)試點(diǎn)供工廠ICT 測(cè)試治具使用............ 2 3. 基準(zhǔn)點(diǎn) (光學(xué)點(diǎn)) -for SMD:........... 4 4. 標(biāo)記 (LABEL ING)......... 5 5. VIA HOLE PAD................. 5 6. PCB Layer 排列方式...... 5 7.零件佈置注意事項(xiàng) (PLACEMENT NOTES)............... 5 8. PCB LAYOUT 設(shè)計(jì)............ 6 9. Transmission Line ( 傳輸線 )..... 8 10.General Guidelines – 跨Plane.. 8 11. General Guidelines – 繞線....... 9 12. General Guidelines – Damping Resistor. 10 13. General Guidelines - RJ45 to Transformer................. 10 14. Clock Routing Guideline........... 12 15. OSC & CRYSTAL Guideline........... 12 16. CPU
上傳時(shí)間: 2013-10-29
上傳用戶:1234xhb
微電腦型RS-485顯示電表(24*48mm/48*96mm) 特點(diǎn): 5位數(shù)RS-485顯示電表 顯示范圍-19999-99999位數(shù) 通訊協(xié)議Modbus RTU模式 寬范圍交直流兩用電源設(shè)計(jì) 尺寸小,穩(wěn)定性高 主要規(guī)格: 顯示范圍:-19999~99999 digit RS-485傳輸速度: 19200/9600/4800/2400 selective RS-485通訊位址: "01"-"FF" RS-485通訊協(xié)議: Modbus RTU mode 顯示幕: Red high efficiency LEDs high 10.16 mm (0.4") (MMX-RS-11X) Red high efficiency LEDs high 20.32 mm (0.8") (MMX-RS-12X) Red high efficiency LEDs high 10.16 mm (0.4")x2 (MMX-RS-22X) 參數(shù)設(shè)定方式: Touch switches 記憶方式: Non-volatile E²PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/power) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(20 to 90% RH non-condensed) CE認(rèn)證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時(shí)間: 2015-01-03
上傳用戶:feitian920
EMI返回電流路徑設(shè)計(jì)
上傳時(shí)間: 2013-10-12
上傳用戶:wang5829
題目:利用條件運(yùn)算符的嵌套來(lái)完成此題:學(xué)習(xí)成績(jī)>=90分的同學(xué)用A表示,60-89分之間的用B表示,60分以下的用C表示。 1.程序分析:(a>b)?a:b這是條件運(yùn)算符的基本例子。
上傳時(shí)間: 2015-01-08
上傳用戶:lifangyuan12
RSA算法 :首先, 找出三個(gè)數(shù), p, q, r, 其中 p, q 是兩個(gè)相異的質(zhì)數(shù), r 是與 (p-1)(q-1) 互質(zhì)的數(shù)...... p, q, r 這三個(gè)數(shù)便是 person_key,接著, 找出 m, 使得 r^m == 1 mod (p-1)(q-1)..... 這個(gè) m 一定存在, 因?yàn)?r 與 (p-1)(q-1) 互質(zhì), 用輾轉(zhuǎn)相除法就可以得到了..... 再來(lái), 計(jì)算 n = pq....... m, n 這兩個(gè)數(shù)便是 public_key ,編碼過(guò)程是, 若資料為 a, 將其看成是一個(gè)大整數(shù), 假設(shè) a < n.... 如果 a >= n 的話, 就將 a 表成 s 進(jìn)位 (s
標(biāo)簽: person_key RSA 算法
上傳時(shí)間: 2013-12-14
上傳用戶:zhuyibin
數(shù)字運(yùn)算,判斷一個(gè)數(shù)是否接近素?cái)?shù) A Niven number is a number such that the sum of its digits divides itself. For example, 111 is a Niven number because the sum of its digits is 3, which divides 111. We can also specify a number in another base b, and a number in base b is a Niven number if the sum of its digits divides its value. Given b (2 <= b <= 10) and a number in base b, determine whether it is a Niven number or not. Input Each line of input contains the base b, followed by a string of digits representing a positive integer in that base. There are no leading zeroes. The input is terminated by a line consisting of 0 alone. Output For each case, print "yes" on a line if the given number is a Niven number, and "no" otherwise. Sample Input 10 111 2 110 10 123 6 1000 8 2314 0 Sample Output yes yes no yes no
上傳時(shí)間: 2015-05-21
上傳用戶:daguda
源代碼\用動(dòng)態(tài)規(guī)劃算法計(jì)算序列關(guān)系個(gè)數(shù) 用關(guān)系"<"和"="將3個(gè)數(shù)a,b,c依次序排列時(shí),有13種不同的序列關(guān)系: a=b=c,a=b<c,a<b=v,a<b<c,a<c<b a=c<b,b<a=c,b<a<c,b<c<a,b=c<a c<a=b,c<a<b,c<b<a 若要將n個(gè)數(shù)依序列,設(shè)計(jì)一個(gè)動(dòng)態(tài)規(guī)劃算法,計(jì)算出有多少種不同的序列關(guān)系, 要求算法只占用O(n),只耗時(shí)O(n*n).
標(biāo)簽: lt 源代碼 動(dòng)態(tài)規(guī)劃 序列
上傳時(shí)間: 2013-12-26
上傳用戶:siguazgb
The government of a small but important country has decided that the alphabet needs to be streamlined and reordered. Uppercase letters will be eliminated. They will issue a royal decree in the form of a String of B and A characters. The first character in the decree specifies whether a must come ( B )Before b in the new alphabet or ( A )After b . The second character determines the relative placement of b and c , etc. So, for example, "BAA" means that a must come Before b , b must come After c , and c must come After d . Any letters beyond these requirements are to be excluded, so if the decree specifies k comparisons then the new alphabet will contain the first k+1 lowercase letters of the current alphabet. Create a class Alphabet that contains the method choices that takes the decree as input and returns the number of possible new alphabets that conform to the decree. If more than 1,000,000,000 are possible, return -1. Definition
標(biāo)簽: government streamline important alphabet
上傳時(shí)間: 2015-06-09
上傳用戶:weixiao99
電力系統(tǒng)在臺(tái)穩(wěn)定計(jì)算式電力系統(tǒng)不正常運(yùn)行方式的一種計(jì)算。它的任務(wù)是已知電力系統(tǒng)某一正常運(yùn)行狀態(tài)和受到某種擾動(dòng),計(jì)算電力系統(tǒng)所有發(fā)電機(jī)能否同步運(yùn)行 1運(yùn)行說(shuō)明: 請(qǐng)輸入初始功率S0,形如a+bi 請(qǐng)輸入無(wú)限大系統(tǒng)母線電壓V0 請(qǐng)輸入系統(tǒng)等值電抗矩陣B 矩陣B有以下元素組成的行矩陣 1正常運(yùn)行時(shí)的系統(tǒng)直軸等值電抗Xd 2故障運(yùn)行時(shí)的系統(tǒng)直軸等值電抗X d 3故障切除后的系統(tǒng)直軸等值電抗 請(qǐng)輸入慣性時(shí)間常數(shù)Tj 請(qǐng)輸入時(shí)段數(shù)N 請(qǐng)輸入哪個(gè)時(shí)段發(fā)生故障Ni 請(qǐng)輸入每時(shí)段間隔的時(shí)間dt
標(biāo)簽: 電力系統(tǒng) 正 計(jì)算 運(yùn)行
上傳時(shí)間: 2015-06-13
上傳用戶:it男一枚
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