程控多路宽电压通道切换电路设计

摘要

In order to overcome the shortage of the traditional calibration method, to simplify the panel design and calibration process of automated test equipments, a program-controlled multiplexed channel switch circuit with wide range input voltage is de-signed based on single-chip microcomputer technology and RS-422 communication interface. Working principle of circuit, choice of components, hardware and software design process are introduced. The circuit has been applied to some test equipments, and runs normally.%为克服传统校验方法的不足，简化自动化测试设备的面板设计和校验过程，基于单片机技术和RS-422通信接口，设计了一种程控多路宽电压通道切换电路。介绍了电路工作原理、元器件选择、软硬件设计过程。该电路已经在多台测试设备的校验环节得到应用，工作性能稳定。