Microchip推出全新下桥臂驱动器：MCP14E系列和MCP14E系列

MicrochiDTeehnologyInc．（美国微芯科技公司）宣布扩展其MOSFET驱动器系列产品。在Microchip下桥臂MCP14E3／4／54．5AMOSFET驱动器上,Microchip推出全新下桥臂MCPl4E6／7／82A和MCP14E9／10／113A驱动器。经扩展后,这一低成本系列器件的额定峰值输出电流为2A至4．5A,工作电压范同宽达4．5V至18V。     

Investigation of GEM-Micromegas detector on X-ray beam of synchrotron radiation

To reduce the discharge of the standard bulk Micromegas and GEM detectors, a GEM-Micromegas detector was developed at the Institute of High Energy Physics. Taking into account the advantages of the two detectors, one GEM foil was set as a preamplifier on the mesh of Micromegas in the structure and the CEM pream- plification decreased the working voltage of Micromegas to significantly reduce the effect of the discharge. At the same gain, the spark probability of the GEM-Micromegas detector can be reduced to a factor 0.01 compared to the standard Micromegas detector, and an even higher gain could be obtained. This paper describes the performance of the X-ray beam detector that was studied at 1W2B Laboratory of Beijing Synchrotron Radiation Facility. Finally, the result of the energy resolution under various X-ray energies was given in different working gases. This indicates that the GEM-Micromegas detector has an energy response capability in an energy range from 6 keV to 20 keV and it could work better than the standard bulk-Micromegas.     

ZigBee＋Arduino无线温度测量装置

Zigduino简介及IDE的设置 Zigduino是一款兼容Arduinol的开源硬件控制器,内部集成了802．15．4协议无线模块、支持任何基于802．15．4协议的无线模块,包括ZigBee、MAC／6LoWPAN和RF4CE。虽然Zigduino的核心单片机ATmega128RFA1的工作电压为3．3V,     

C8051F850：BLDC马达参考设计

Silabs公司的C8051F85x/6x是嵌入高效增强性8051流水线架构CPU核的MCU,25MHzs时钟和高达25MIPS吞吐量,采用标准的8051指令集,闪存高达8kB,多达512B RAM。具有多达12路输入ADC,2个模拟比较器和片上调试,通信接口包括UART、SPI和I～2C/SMBus,工作电压2.2V～3.6V,主要用在无刷DC马车驱动、FTTH和FTTH网络、传感器接口以及照明系统、机顶盒和投映仪。     

MSP430FR59x：超低功耗嵌入FRAM MCU开发方案

TI公司的MSP430FR59x系列是超低功耗（ULP）嵌入FRAM的MCU,16位RISC架构高达16MHz时钟,工作电压1.8V～3.6V,多达64kB非易失存储器工作模式功耗约为100μA/MHz,待机模式功耗为0.4μA,关断时功耗为0.02μA。器件主要用在仪表、能量收获传感器节点、可穿戴电子、传感器管理和数据记录应用中。     

信息技术设备的医用绝缘配合研究

按照患者防护要求,进一步探讨了信息技术设备常规附加隔离措施的绝缘配合。给出了变压器隔离后的“工作电压”理论数值,进行了隔离后“带电”部分的定量分析。研究表明,平衡输出可使次级“工作电压”理论值降低为不平衡输入电压值的一半,隔离后次级电压“带电”与否取决于次级电路隔离前的对地漏电流。在此基础上给出了患者防护爬电距离限值的修正建议。此外,给出了操作者防护措施（MOOP）与患者防护措施（MOPP）的选择示例,可供产品设计和检测人员参考。