电化学CO传感器

此类传感器 系一微型燃料电池，设计成为免维护型并且能长时间稳定工作的产品。所采用的技术立足于己于人本公司早期氧传感器的工作基础，系直接响应气体的体积浓度变化，而不是响应其压力的变化。

AQW212EHA_光电继电器

FEATURES 1. Compact 8-pin DIP size The device comes in a compact (W) 6.4 ´ (L) 9.78 ´(H) 3.9 mm (W) .252 ´(L) .385 ´(H) .154 inch, 8-pin DIP size (through hole terminal type). 2. Applicable for 2 Form A use as well as two independent 1 Form A use 3. Controls low-level analog signals PhotoMOS relays feature extremely low closed-circuit offset voltage to enable control of low-level analog signals without distortion. 4. High sensitivity, high speed response Can control a maximum 0.13 A load current with a 5 mA input current. Fast operation speed of 310 ms (typical). (AQW214) 5. Low-level off state leakage current The SSR has an off state leakage current of several milliamperes whereas the PhotoMOS relays has only 100 pA even with the rated load voltage of 400 V (AQW214). 6. Low-level thermal electromotive force (Approx. 1 mV) 7. Eliminates the need for a counter electromotive force protection diode in the drive circuits on the input side 8. Stable ON resistance. 9. Eliminates the need for a power supply to drive the power MOSFET

嵌入式之zigbee

zigbee详解。CC2430是一颗真正的系统芯片(SoC)CMOS解决方案。这种解决方案能够提高性能并满足以ZigBee为基础的2.4GHz ISM波段应用，及对低成本，低功耗的要求。它结合一个高性能2.4GHz DSSS(直接序列扩频)射频收发器核心和一颗工业级小巧高效的8051控制器。

2005年9月二级C笔试试卷含答案.doc

考试真题，多多下载，2005年9月二级C笔试试卷含答案.doc