a8259 可编程中断控制 altera提供 The a8259 is designed to simplify the implementation of the interrupt interface in 8088 and 8086 based microcomputer systems. The device is known as a programmable interrupt controller. The a8259 receives and prioritizes up to 8 interrupts, and in the cascade mode, this can be expanded up to 64 interrupts. An asynchronous reset and a clock input have been added to improve operation and reliability.
上传时间: 2015-01-02
上传用户:panpanpan
Q01、如何使一条走线至两个不同位置零件的距离相同? 您可先在Design/Rule/High Speed/Matched Net Lengths的规则中来新增规则设定,最 后再用Tools/EqualizeNet Lengths 来等长化即可。 Q02、在SCHLIB中造一零件其PIN的属性,如何决定是Passive, Input, I/O, Hi- Z,Power,…..?在HELP中能找到说明吗?市面有关 SIM?PLD?的书吗?或贵公司有讲义? 你可在零件库自制零件时点选零件Pin脚,并在Electrical Type里,可以自行设定PIN的 属性,您可参考台科大的Protel sch 99se 里 面有介绍关于SIM的内容。 Q03、请问各位业界前辈,如何能顺利读取pcad8.6版的线路图,烦请告知 Protel 99SE只能读取P-CAD 2000的ASCII档案格式,所以你必须先将P-CAD8.6版的格式 转为P-CAD 2000的档案格式,才能让Protel读取。
标签: Protel
上传时间: 2013-11-07
上传用户:tangsiyun
为了提高直接转矩控制(DTC)系统定子磁链估计精度,降低电流、电压测量的随机误差,提出了一种基于扩展卡尔曼滤波(EKF)实现异步电机转子位置和速度估计的方法。扩展卡尔曼滤波器是建立在基于旋转坐标系下由定子电流、电压、转子转速和其它电机参量所构成的电机模型上,将定子电流、定子磁链、转速和转子角位置作为状态变量,定子电压为输入变量,定子电流为输出变量,通过对磁链和转速的闭环控制提高定子磁链的估计精度,实现了异步电机的无速度传感器直接转矩控制策略,仿真结果验证了该方法的可行性,提高了直接转矩的控制性能。 Abstract: In order to improve the Direct Torque Control(DTC) system of stator flux estimation accuracy and reduce the current, voltage measurement of random error, a novel method to estimate the speed and rotor position of asynchronous motor based on extended Kalman filter was introduced. EKF was based on d-p axis motor and other motor parameters (state vector: stator current, stator flux linkage, rotor angular speed and position; input: stator voltage; output: staror current). EKF was designed for stator flux and rotor speed estimation in close-loop control. It can improve the estimated accuracy of stator flux. It is possible to estimate the speed and rotor position and implement asynchronous motor drives without position and speed sensors. The simulation results show it is efficient and improves the control performance.
上传时间: 2015-01-02
上传用户:qingdou
微电脑型RS-485显示电表(24*48mm/48*96mm) 特点: 5位数RS-485显示电表 显示范围-19999-99999位數 通訊协议Modbus RTU模式 宽范围交直流兩用電源設計 尺寸小,穩定性高 主要规格: 显示范围:-19999~99999 digit RS-485传输速度: 19200/9600/4800/2400 selective RS-485通讯位址: "01"-"FF" RS-485通讯协议: Modbus RTU mode 显示幕: 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) 参数设定方式: Touch switches 记忆方式: Non-volatile E²PROM memory 绝缘耐压能力: 2KVac/1 min. (input/power) 使用环境条件: 0-50℃(20 to 90% RH non-condensed) 存放环境条件: 0-70℃(20 to 90% RH non-condensed) CE认证: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上传时间: 2015-01-03
上传用户:feitian920
微电脑型单相交流集合式电表(单相二线系统) 特点: 精确度0.25%满刻度±1位数 可同时量测与显示交流电压,電流,頻率,瓦特,(功率因數/視在功率) 交流電壓,電流,瓦特皆為真正有效值(TRMS) 交流電流,瓦特之小數點可任意設定 瓦特單位W或KW可任意設定 CT比可任意設定(1至999) 輸入與輸出絕緣耐压 2仟伏特/1分鐘( 突波測試強度4仟伏特(1.2x50us) 數位RS-485界面 (Optional) 主要规格: 精确度: 0.1% F.S.±1 digit (Frequency) 0.25% F.S.±1 digit(ACA,ACV,Watt,VA) 0.25% F.S. ±0.25o(Power Factor) (-.300~+.300) 输入负载: <0.2VA (Voltage) <0.2VA (Current) 最大过载能力: Current related input: 3 x rated continuous 10 x rated 30 sec. 25 x rated 3sec. 50 x rated 1sec. Voltage related input: maximum 2 x rated continuous 过载显示: "doFL" 显示值范围: 0~600.0V(Voltage) 0~999.9Hz(Frequency)(<20% for voltage input) 0~19999 digit adjustable(Current,Watt,VA) 取样时间: 2 cycles/sec. RS-485通讯位址: "01"-"FF" RS-485传输速度: 19200/9600/4800/2400 selective RS-485通信协议: Modbus RTU mode 温度系数: 100ppm/℃ (0-50℃) 显示幕: Red high efficiency LEDs high 10.16 mm(0.4") 参数设定方式: Touch switches 记忆型式: Non-volatile E²PROM memory 绝缘抗阻: >100Mohm with 500V DC 绝缘耐压能力: 2KVac/1 min. (input/output/power) 1600 Vdc (input/output) 突波测试: ANSI c37.90a/1974,DIN-IEC 255-4 impulse voltage 4KV(1.2x50us) 使用环境条件: 0-50℃(20 to 90% RH non-condensed) 存放环境条件: 0-70℃(20 to 90% RH non-condensed) CE认证: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上传时间: 2015-01-03
上传用户:几何公差
集合式直流电能表(小功率的) 特点: 精确度0.05%满刻度±1位数 可同时量测与显示/直流电压/电流/瓦特(千瓦)/瓦特小时(千瓦小时) 电压输入(DC0-99.99V/0-600.0V)自动变档功能 显示范围0-9999(电流/瓦特/千瓦),0至99999999(八位數瓦特小时)可任意规划 数位RS-485 界面 (Optional) 主要规格: 辅助电源消耗功率:<0.35VA(DC12V/DC24V) <0.5VA(DC48V) <1.5VA(AC90-240V(50/60Hz)) 精确度: 0.05% F.S. ±1 digit (23 ±5℃) 输入范围:Auto range(DC0-99.99V/0-600.0V(DC voltage)) 输入抗阻:>5MΩ(DC voltage) 取样时间:10 cycles/second(total) 过载显示: " doFL " 显示值范围: 0-9999 digit(DCA/W(KW)) 0-9999999.999 digit(WH/(KWH)) RS-485传输速度: 19200/9600/4800/2400 selective RS-485通讯位址: "01"-"FF"(0-255) RS-485通信协议: Modbus RTU mode 温度系数: 50ppm/℃ (0-50℃) 显示幕:Bight Red LEDs high 10.16 mm(0.4") 参数设定方式: Touch switches 记忆方式: Non-volatile E²PROM memory 绝缘耐压能力:2KVac/1min.(input/output)(RS-485(Isolating)) 1600 Vdc (input/output) (RS-485(Isolating)) 使用环境条件: 0-50℃(20 to 90% RH non-condensed) 存放环境条件: 0-70℃(20 to 90% RH non-condensed) CE认证: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上传时间: 2013-11-20
上传用户:s363994250
特点: 精确度0.25%满刻度±1位數 可量测交流瓦特/乏爾/功率因數/相角 显示范围0- ±19999可任意规划 输入与输出绝缘耐压2仟伏特/1分钟(input/output/power)) 突波测试强度4仟伏特(1.2x50us) 2组警报功能 (Optional) 15BIT类比输出功能 (Optional) 数位RS-485界面 (Optional)
上传时间: 2013-11-08
上传用户:330402686
Logger iButton devices have gained a lot of popularity with researchers. Although free evaluation software is easy to use and welldocumented, the choices and inputs that need to be made can sometimes be challenging. This application note explains technicalterms that are common with temperature logger iButtons and how they relate to each other. Additionally, it presents an algorithm tohelp users choose the necessary input parameters, including the sample rate based on a user's needs and the available memory tostore the data.
上传时间: 2013-11-16
上传用户:xywhw1
Delta-sigma ADCs, with their high accuracy and high noiseimmunity, are ideal for directly measuring many typesof sensors. Nevertheless, input sampling currents canoverwhelm high source impedances or low-bandwidth,micropower signal conditioning circuits. The LTC®2484family of delta sigma converters solves this problem bybalancing the input currents, thussimplifying or eliminatingthe need for signal conditioning circuits.
上传时间: 2015-01-03
上传用户:潜水的三贡
在集成电路内建自测试的过程中,电路的测试功耗通常显著高于正常模式产生的功耗,因此低功耗内建自测试技术已成为当前的一个研究热点。为了减少被测电路内部节点的开关翻转活动率,研究了一种随机单输入跳变(Random Single Input Change,RSIC)测试向量生成器的设计方案,利用VHDL语言描述了内建自测试结构中的测试向量生成模块,进行了计算机模拟仿真并用FPGA(EP1C6Q240C8)加以硬件实现。实验结果证实了这种内建自测试原理电路的正确性和有效性。
上传时间: 2013-10-08
上传用户:llwap