摘要：本应用笔记介绍了如何使用3线接口与DS3900 PC串口通信与三个数字电位器， DS1267 ， DS1867 ， DS1868 ，使用这种移位寄存器的编程接口。与DS3900是一个模块，有1 MAX3223 RS -232收发器和微处理器充当PC的串口被控制的3线设备之间的接口。允许微处理器模块的通信与PC和微处理器实现的命令结构，通过并行端口，让PC机读取或写入的三个数字电位器的收发器。本应用笔记介绍了与DS3900和如何连接到被测设备。本文中所描述的源代码是达拉斯半导体公司的FTP站点上可用。Maxim > App Notes > A/D and D/A CONVERSION/SAMPLING CIRCUITS DIGITAL POTENTIOMETERS GENERAL ENGINEERING TOPICS Keywords: DS1267, DS1867, DS1868, DS3900, 3-wire , digital pots, 3wire, digital potentiometers Aug 27, 2002 APPLICATION NOTE 213 Using a PC with a DS3900 to Communicate with DS1267s, DS1867s, and DS1868s Abstract: This application note describes how to use the DS3900 PC serial port to 3-wire interface to communicate with the three digital pots, the DS1267, DS1867, and DS1868, which use this shift register interface for programming. The DS3900 is a module that has a MAX3223 RS-232 transceiver and a microprocessor which acts as an interface between the PC's serial port the 3-wire device being controlled. The transceiver allows the module’s microproces……