DS2505为16k位只添加存储器，可以识别和存储与产品相关的信息。此篇主要介绍了DS2505 特性、应用范围、参考设计电路以及电路分析，帮助大家缩短设计时间。

     DS2505特性：16384位电可编程只读存储器(EPROM);内置多点控制器;将控制线、地址线、数据线、电源和可编程信号线集于一条总线;直接与微处理器的一个口线连接、通信速率可达16.3kbps

     DS2505典型应用范围：配件与外设识别;医用传感器鉴定与校准;网络节点识别

     DS2505参考设计应用电路：

     图1 DS2505内部结构图

     The DS2505 16k bits Add–Only Memory identifies and stores relevant information about the product to which it is associated. This lot or product specific information can be accessed with minimal interface, for example a single port pin of a microcontroller.

     图2 DS2505参考设计图

     The DS2505 has three main data components: 1) 64–bit lasered ROM, 2) 16384–bits EPROM Data Memory, and 3) 704–bits EPROM Status Memory.The device derives its power for read operations entirely from the 1–Wire communication line by storing energy on an internal capacitor during periods of time when the signal line is high and continues to operate off of this “parasite” power source during the low times of the 1–Wire line until it returns high to replenish the parasite (capacitor) supply.