摘要： DS1868采用3线接口（移位寄存器）双数字电位器。本应用笔记介绍了所需的接口DS1868的逻辑和固件，以及任何其他Dallas Semiconductor的3线设备，摩托罗拉SPI总线。Maxim > App Notes > DIGITAL POTENTIOMETERS GENERAL ENGINEERING TOPICS INTERFACE CIRCUITS Keywords: 3-wire interface, SPI to 3-wire, SPI bus, digital potentiometers, digital pots, SPI interface, shift register Dec 26, 2001 APPLICATION NOTE 169 Interfacing a DS1868 3-Wire Device to a SPI Bus Abstract: The DS1868 uses a dual digital potentiometer with a 3-wire (shift register) interface. This application note describes the logic and firmware required to interface the DS1868, as well as any other Dallas Semiconductor 3-wire devices to the Motorola SPI bus. Introduction to DS1868 The DS1868 is a dual digital potentiometer with a 3-wire interface. This application note will describe how to interface a Dallas Semiconductor 3- wire device to a microcontroll……