| 积分式直流数字电压表的设计 摘要：在不采用专用A/D转换器芯片的前提下设计积分式直流数字电压表，设计采用压频（V/F）变换器LM331将预处理后的电压转化成相应的频率，通过单片机80C51测得频率，经过压频变换的线性度比例软件处理后LED显示。预处理部分采用了程控放大器PGA100对不同的信号放大满足线性度要求。为了节省端口，LED驱动显示采用SPI接口芯片HD7279A。 关键字：LM331；80C51；PGA100；HD7279A Abstract：By converting preprocessed voltage into frequency using V/F converter LM331, the frequency is obtained by microprocessor 80C51, after V/F conversion linear proportional software disposing voltage displays on LED ,a integral direct digital voltmeter is designed without A/D converter chip.PGA100 which meet the demand of different signal is used in preprocess part. To save ports, SPI interface chip HD7279A is used in LED display drive. Keywords: LM331；80C51；PGA100；HD7279A |
查看评论
已有0位网友发表了看法