为了解决磁放大器性能测试过程中，需要对其供给不同数值恒定电流的问题，设计了一种基于DAC7512和单片机的数控恒流源系统。该系统采用AT89C51作为主控器件，将计算机发送的电流控制字命令转换为D/A转换器控制字，通过模拟SPI通信接口，写D/A控制字到DAC7512，从而控制其输出相应数字电压值，经差动缩放电路、电压/电路变换电路和功率驱动电路，最后输出恒定电流。实验结果表明，恒流源输出电流调节范围为-45~+45 mA、精度为±0.1 mA，分辨率达0.024 4 mA，具有应用灵活，外围电路简单，可靠性高的特点。该数控直流恒流源也可为相关产品的测试系统研发提供参考。 Abstract: In order to solve the need to supply different values constant current for the magnetic amplifier in testing process， numerical control constant current source system was designed based on DAC7512 chip and microcontroller technology. The system used the AT89C51 as the main chip， which can convert the current control word from computer into to D/A control words. And the system wrote D/A control word into the DAC7512 chip to control the output voltage value by the SPI communication interface， which can output corresponding constant current figures by scaling circuit， the V/I converter and power drive circuit. Experimental results show that the current source output current adjustment range is -45~+45mA， accuracy is ± 0.1mA， and resolution ratio is 0.024 4mA
上传时间： 2014-12-27
上传用户：invtnewer
汽车发动机电控系统的结构与维修(A)试题
上传时间： 2013-10-09
上传用户：hsfei8
The MSP-FET430PIF is a Parallel Port interface (does not include target board) that is used to program and debug MSP430 FET tools and test boards through the JTAG interface. This interface is included in our FET tools, but sold without the development board. This interface uses a Parallel PC Port to communicate to the Debugger Software (IAR Kickstart software included) running on the PC. The interface uses the standard 14 pin header to communicate to the MSP430 device using the standard JTAG protocol. The flash memory can be erased and programmed in seconds with only a few keystrokes, and since the MSP430 flash is extremely low power, no external power supply is required. The tool has an integrated software environment and connects directly to the PC which greatly simplifies the set-up and use of the tool. The flash development tool supports development with all MSP430 flash parts. Features MSP430 debugging interface to connect a MSP430-Flash-device to a Parallel port on a PC Supports JTAG debug protocol (NO support for Spy-Bi-Wire (2-wire JTAG) debug protocol, Spy-Bi-Wire (2-wire JTAG) is supported by MSP-FET430UIF) Parallel Port cable and a 14-conductor target cable Full documentation on CD ROM Integrated IAR Kickstart user interface which includes: Assembler Linker Limulator Source-level debugger Limited C-compiler Technical specifications: Backwardly compatable with existing FET tool boards.
上传时间： 2013-10-26
上传用户：fengweihao158@163.com
HT46R23/HT46C23是8位高性能精简指令集单片机，专门为需要A/D转换的产品而设计，例如传感器信号输入。掩膜版本HT46C23与OTP版本HT46R23引脚和功能完全相同。低功耗、I/O使用灵活、可编程分频器、计数器、振荡类型选择、多通道A/D转换、脉冲测量功能、I2C通信、暂停和唤醒功能，使这款单片机可以广泛应用于传感器的A/D转换、马达控制、工业控制、消费类产品等系统中。
上传时间： 2013-11-02
上传用户：aa54
单片机在日常生活中用得越来越多,其集成度也越来越高,目前拥有多种单片机都集成有A/D转换功能，如PIC，AVR，SUNPLUS，SH等。处理器的位数从4位到32位或更高，转换精度从6位，8位，10位或更高。
上传时间： 2013-10-28
上传用户：xa_lgy
摘 要:从应用角度介绍了具有11个输入端的12位A/D转换器TLC2543的结构与编程要点,探讨了TLC2543与51系列单片机的接口方法,用软件合成SPI操作,给出了接口电路与A/D采集程序设计实例,并对实际应用时应注意的问题进行了探讨。关键词:A/D转换;TLC2543芯片;51系列单片机;接口技术
上传时间： 2013-11-22
上传用户：瓦力瓦力hong
PICKIT™ 2 PROGRAMMER-TO-GO USER GUIDE The PICkit 2 Programmer-To-Go functionality allows a PIC MCU memory image to be downloaded into the PICkit 2 unit for later programming into a specific PIC MCU. No software or PC is required to program devices once the PICkit 2 unit is set up for Programming-To-Go. A USB power source for the PICkit 2 is all that is needed.
标签： PROGRAMMER-TO PICKIT 8482
上传时间： 2013-10-29
上传用户：ca05991270
A/D 型单片机使用说明书/手册 第一部份 单片机概论.................................................................. 1第一章 硬件结构........................................................................................ 3简介..............................................................................................................3特性..............................................................................................................4技术特性..............................................................................................4内核特性..............................................................................................4周边特性..............................................................................................5选择表..........................................................................................................5系统框线图..................................................................................................6引脚分配......................................................................................................7引脚说明......................................................................................................8极限参数....................................................................................................12直流电气特性............................................................................................13交流电气特性............................................................................................14系统结构....................................................................................................15时序和流水线结构(Pipelining) .........................................................15程序计数器........................................................................................17堆栈....................................................................................................19算术及逻辑单元 – ALU...................................................................20程序存储器................................................................................................21结构....................................................................................................21特殊向量............................................................................................22查表....................................................................................................23查表程序范例....................................................................................23数据存储器................................................................................................25结构....................................................................................................25通用数据存储器................................................................................26专用数据存储器................................................................................27
上传时间： 2014-12-27
上传用户：youlongjian0
8 位A/D 型OTP/Mask 单片机 概述HT46x23 是8 位高性能精简指令集单片机专门为多输入/输出口的产品而设计的特别适合应用于像洗衣机控制器和家用电器类产品其HALT 功能可降低功耗.
上传时间： 2013-11-11
上传用户：love1314
基于HT46系列MCU的A/D应用范例 该软件示例46 系列AD 口的使用
上传时间： 2014-01-05
上传用户：love1314
