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BGA布線指南

BGA布線指南 BGA CHIP PLACEMENT AND ROUTING RULE BGA是PCB上常用的組件，通常CPU、NORTH BRIDGE、SOUTH BRIDGE、AGP CHIP、CARD BUS CHIP…等，大多是以bga的型式包裝，簡(jiǎn)言之，80﹪的高頻信號(hào)及特殊信號(hào)將會(huì)由這類型的package內(nèi)拉出。因此，如何處理BGA package的走線，對(duì)重要信號(hào)會(huì)有很大的影響。通常環(huán)繞在BGA附近的小零件，依重要性為優(yōu)先級(jí)可分為幾類： 1. by pass。 2. clock終端RC電路。 3. damping（以串接電阻、排組型式出現(xiàn)；例如memory BUS信號(hào)） 4. EMI RC電路（以dampin、C、pull height型式出現(xiàn)；例如USB信號(hào)）。 5. 其它特殊電路（依不同的CHIP所加的特殊電路；例如CPU的感溫電路）。 6. 40mil以下小電源電路組（以C、L、R等型式出現(xiàn)；此種電路常出現(xiàn)在AGP CHIP or含AGP功能之CHIP附近，透過(guò)R、L分隔出不同的電源組）。 7. pull low R、C。 8. 一般小電路組（以R、C、Q、U等型式出現(xiàn)；無(wú)走線要求）。 9. pull height R、RP。中文DOC，共5頁(yè)，圖文并茂

標(biāo)簽： BGA 布線

上傳時(shí)間： 2013-04-24

上傳用戶：cxy9698
74LS48.pdf

英文描述： BCD-to-Seven-Segment Decoder Driver(Internal Pull-up outputs) 中文描述： BCD碼到七段解碼器驅(qū)動(dòng)程序（內(nèi)部上拉輸出）

標(biāo)簽： 74 48 LS

上傳時(shí)間： 2013-07-13

上傳用戶：cc1015285075
基于凌陽(yáng)單片機(jī)的步進(jìn)電機(jī)加減速的控制方法

提出一種基于凌陽(yáng)單片機(jī)的步進(jìn)電機(jī)加減速的控制方法。采用凌陽(yáng)科技推出的16位結(jié)構(gòu)工控單片機(jī)SPMC75F2413A為控制器，由Allegro公司生產(chǎn)的兩相步進(jìn)電機(jī)專用驅(qū)動(dòng)器件SLA7042M構(gòu)成步進(jìn)電機(jī)的驅(qū)動(dòng)電路，在傳統(tǒng)的3段直線加減速控制算法基礎(chǔ)上增加至7段S形曲線加減速過(guò)程，控制步進(jìn)電機(jī)的啟動(dòng)和停止。實(shí)驗(yàn)結(jié)果表明，該控制方法克服了直線加減速中不連續(xù)、易造成系統(tǒng)沖擊的問(wèn)題，整個(gè)系統(tǒng)實(shí)現(xiàn)柔性控制，電機(jī)啟動(dòng)、停止連續(xù)性能提高30%。 Abstract: The method of controlled stepping motor is referred based on SPMC75F2413A MCU， which adopts the 16 knots SPMC75F2413A MCU as the controller. The special-purpose actuation chip SLA7042M of two stepping motor produced by Allegro Corporation constituted to actuation electric circuit. The purpose of increasing to seven section of S shape curve based on the traditional three sections of straight line is to control the start and stop process of stepping motor. The experimental results show that the control method solves easy to pull-out and overshot problems. The overall system realizes flexible control， and the performance of motor start or stop continuity is increased 30%

標(biāo)簽： 凌陽(yáng)單片機(jī) 步進(jìn)電機(jī) 減控制方法

上傳時(shí)間： 2013-12-08

上傳用戶：jiangfire
PCA954X家庭的I C SMBus多路復(fù)用器與開(kāi)關(guān)

The Philips family of Multiplexers and Switches consists of bi-directional translating switches controlled via the I2C or SMBus to fan out an upstream SCL/SDA pair to 2, 4 or 8 downstream channels of SCx/SDx pairs. The Multiplexers allow only one downstream channel to be selected at a time, while the Switches allow any individual downstream channel or combination of downstream channels to be selected, depending on the content of the programmable control register. Once one or several channels have been selected, the device acts as a wire, allowing the master on the upstream channel to send commands to devices on all the active downstream channels, and devices on the active downstream channels to communicate with each other and the master. External pull-up resistors are used to pull each individual channel up to the desired voltage level. Combined interrupt output and hardware reset input are device options that are featured.

標(biāo)簽： SMBus 954X PCA 954

上傳時(shí)間： 2013-10-11

上傳用戶：dianxin61
68HC05K0 Infra-red Remote Cont

The MC68HC05K0 is a low cost, low pin countsingle chip microcomputer with 504 bytes of userROM and 32 bytes of RAM. The MC68HC05K0 isa member of the 68HC05K series of devices whichare available in 16-pin DIL or SOIC packages.It uses the same CPU as the other devices in the68HC05 family and has the same instructions andregisters. Additionally, the device has a 15-stagemulti-function timer and 10 general purposebi-directional I/0 lines. A mask option is availablefor software programmable pull-downs on all ofthe I/O pins and four of the pins are capable ofgenerating interrupts.The device is ideally suited for remote-controlkeyboard applications because the pull-downs andthe interrupt drivers on the port pins allowkeyboards to be built without any externalcomponents except the keys themselves. There isno need for external pull-up or pull-down resistors,or diodes for wired-OR interrupts, as these featuresare already designed into the device.

標(biāo)簽： Infra-red Remote Cont 05K

上傳時(shí)間： 2014-01-24

上傳用戶：zl5712176
DS1820 C51 子程序 (一線數(shù)據(jù)傳輸)

//芯片資料請(qǐng)到www.elecfans.com查找 //DS1820 C51 子程序//這里以11.0592M晶體為例，不同的晶體速度可能需要調(diào)整延時(shí)的時(shí)間//sbit DQ =P2^1;//根據(jù)實(shí)際情況定義端口 typedef unsigned char byte;typedef unsigned int word; //延時(shí)void delay(word useconds){ for(;useconds>0;useconds--);} //復(fù)位byte ow_reset(void){ byte presence; DQ = 0; //pull DQ line low delay(29); // leave it low for 480us DQ = 1; // allow line to return high delay(3); // wait for presence presence = DQ; // get presence signal delay(25); // wait for end of timeslot return(presence); // presence signal returned} // 0=presence, 1 = no part //從 1-wire 總線上讀取一個(gè)字節(jié)byte read_byte(void){ byte i; byte value = 0; for (i=8;i>0;i--) { value>>=1; DQ = 0; // pull DQ low to start timeslot DQ = 1; // then return high delay(1); //for (i=0; i<3; i++); if(DQ)value|=0x80; delay(6); // wait for rest of timeslot } return(value);} //向 1-WIRE 總線上寫(xiě)一個(gè)字節(jié)void write_byte(char val){ byte i; for (i=8; i>0; i--) // writes byte, one bit at a time { DQ = 0; // pull DQ low to start timeslot DQ = val&0x01; delay(5); // hold value for remainder of timeslot DQ = 1; val=val/2; } delay(5);} //讀取溫度char Read_Temperature(void){ union{ byte c[2]; int x; }temp; ow_reset(); write_byte(0xCC); // Skip ROM write_byte(0xBE); // Read Scratch Pad temp.c[1]=read_byte(); temp.c[0]=read_byte(); ow_reset(); write_byte(0xCC); //Skip ROM write_byte(0x44); // Start Conversion return temp.x/2;}

標(biāo)簽： 1820 C51 DS 程序

上傳時(shí)間： 2013-11-03

上傳用戶：hongmo
3.3v看門狗芯片

The STWD100 watchdog timer circuits are self-contained devices which prevent systemfailures that are caused by certain types of hardware errors (non-responding peripherals,bus contention, etc.) or software errors (bad code jump, code stuck in loop, etc.).The STWD100 watchdog timer has an input, WDI, and an output, WDO (see Figure 2). Theinput is used to clear the internal watchdog timer periodically within the specified timeoutperiod, twd (see Section 3: Watchdog timing). While the system is operating correctly, itperiodically toggles the watchdog input, WDI. If the system fails, the watchdog timer is notreset, a system alert is generated and the watchdog output, WDO, is asserted (seeSection 3: Watchdog timing).The STWD100 circuit also has an enable pin, EN (see Figure 2), which can enable ordisable the watchdog functionality. The EN pin is connected to the internal pull-downresistor. The device is enabled if the EN pin is left floating.

標(biāo)簽： 3.3 看門狗芯片

上傳時(shí)間： 2013-10-22

上傳用戶：taiyang250072
Enhydra的KXML是一個(gè)只占很小存儲(chǔ)空間的XML語(yǔ)法分析程序

Enhydra的KXML是一個(gè)只占很小存儲(chǔ)空間的XML語(yǔ)法分析程序，對(duì)于J2ME應(yīng)用程序非常適合。它有一個(gè)非常獨(dú)特的DOM操作方法和被稱為Pull的語(yǔ)法分析方法

標(biāo)簽： Enhydra KXML XML 存儲(chǔ)空間

上傳時(shí)間： 2015-03-27

上傳用戶：BOBOniu
=== === =時(shí)鐘20:6=== === === == 應(yīng)先初始化狀態(tài)寄存器 tx1714 EQU 7FFH PA EQU 05H PB EQU 06H PC EQU 07H

=== === =時(shí)鐘20:6=== === === == 應(yīng)先初始化狀態(tài)寄存器 tx1714 EQU 7FFH PA EQU 05H PB EQU 06H PC EQU 07H PD EQU 20H IAR EQU 00H 間接尋址寄存器 TMR0 EQU 01H 定時(shí)器 STATUS EQU 03H 狀態(tài)寄存器 BSR EQU 04H bank選擇寄存器 PORTA EQU 05H I/0端口寄存器 PORTB EQU 06H I/0端口寄存器 PORTC EQU 07H I/0端口寄存器 PORTD EQU 20H I/0端口寄存器 PULL EQU 21H PULL-High上拉寄存器 WAKEUP EQU 22H 喚醒控制寄存器－－被用來(lái)設(shè)定watchdog允許和禁止 IRQM EQU 23H 中斷屏蔽寄存器 IRQF EQU 24H 中斷標(biāo)志寄存器 WDTSEL EQU 25H

標(biāo)簽： EQU 1714 7FFH 05H

上傳時(shí)間： 2013-12-13

上傳用戶：chfanjiang
使用kxml解析xml

使用kxml解析xml，兩種方式一種pull一種doc

標(biāo)簽： kxml xml

上傳時(shí)間： 2013-12-26

上傳用戶：leehom61