控制DS1803数字电位器使用一个8051微处理器生成2线信号

摘要：本文演示使用Dallas Semiconductor的8051兼容微处理器的DS87C520控制DS1803的硬件和软件解决方案。它描述了如何产生的2线通信信号需要通过两个微控制器上的端口引脚。一个基本的原理图显示之间的微处理器和DS1803的必要的连接，和8051汇编代码提供了一个小型应用程序，控制芯片的两个数字电位器使用不同的写入模式。每个写周期结束后，应用程序的DS1803读回的信息，并显示在电脑上通过一个串行端口，表现出正常运作的读取功能。在这篇文章中所描述的应用程序的源代码。

Application Note 139
Controlling a DS1803 Digital Potentiometer Using an
8051 Microprocessor to Generate 2-Wire Signals
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Introduction
Dallas Semiconductor’s DS1803 is ideal for systems that require the ability to change a biasing resistance,
current, or voltage, without the manual intervention required by a mechanical potentiometer. It can also
provide a dual Digital to Analog Converter (DAC) if the potentiometers are wired as voltage dividers.
Because the DS1803 requires only two I/O pins from a microprocessor to address up to 16 potentiometers, it
is perfect for applications with limited I/O capacity and high performance requirement