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中文摘要：
功耗问题一直是两线制变送器的一个难题。设计采用DC/DC电源解决了两线制变送器的瓶颈问题,即输出电流为4 mA时整机能够正常工作。介绍了以MSP430F169为核心设计的隔离双路两线制温湿度变送器,包括整个系统的原理框图、电源部分电路、SHT11传感器、V/I转换电路、软件流程图。
英文摘要：
Power dissipation is always a difficult problem in 2-wire transmitter.By using DC/DC efficiency conversion,the bottleneck problem in 2-wire transmitter can be solved,i.e.at output current of 4 mA proper operation of transmitter can be ensured.This paper described a circuit of an isolated dual channels 2-wire transmitter,controlled by MSP430F169,including the principle block diagram,power supply,CPU and peripheral circuit,V/I converting circuit,software flowchart of main process.
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