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产品 PCA9555TI
描述

这个用于两线双向总线 (I2C) 的 16 位扩展器设计用于 2.3V 至 5.5V VCC 运行。通过 I2C 接口 [串行时钟 (SCL),串行数据 (SDA)],它为大多数微控制器系列产品提供通用远程 I/O 扩展。PCA9555 由两个 8 位配置(输入或输出选择)、输入端口、输出端口和极性反转(高电平有效或低电平有效运行)寄存器组成。在加电时,I/O 被配置为输入。系统主控制器可以通过写入 I/O 配置位将 I/O 启动为输入或输出。每一个输入或者输出的数据被保存在相应的输入或者输出寄存器内。输入端口寄存器的极性可借助极性反转寄存器进行转换。所有寄存器都可由系统主控器读取。

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