用数据采集卡的数字通道控制外部电路  

Control external circuit by using digital channels of data acquisition card

作　　者：胡险峰[1] Hu Xianfeng(College of Physical Science and Technology, Sichuan University, Chengdu 610064, China)

机构地区：[1]四川大学物理科学与技术学院,四川成都610064

出　　处：《微型机与应用》2017年第24期22-24,31,共4页Microcomputer & Its Applications

摘　　要：数据采集卡的数字信号通道具有输入输出功能,在做信号采集时输出的控制信号会被重置。外部设备或电路有控制信号存储功能时,可以直接用数字信号通道以并行或串行模式来控制。外部设备或电路没有控制信号存储功能时,需要外部设置控制信号保持电路,以便数据采集卡转而控制其他外设或电路,或转入数据采集模式。J-K触发器或D触发器可以用来保持控制信号,可以方便、有效地控制AD9850信号发生器模块、L298马达控制模块以及用USBee Dx-Pro数据采集卡实现的虚拟示波器外部增益程控电路。Digital signal channels of data acquisition card have input and output functions. Outputted control signal will be reset in acquiring external signal. If the external devices or circuits have control signal storage function, they can be directly controlled by the digital signal channels under parallel or serial mode. When there is no control signal storage capability in external devices or circuits, an external holding circuit of the control signal will be required, for the data acquisition card in turn to control other devices or circuits, or change to data collection mode. J-K trigger, or D flip-flop can be used to keep the control signal. Using them can easily and effectively control the AD9850 signal generator module, L298 motor control module, and external gain control circuit of virtual oscilloscope using USBeeDx-Pro data acquisition card.

关 键 词：数据采集卡 数字通道 控制信号 保持电路 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置]