摘要
介绍一种基于PCF8574和数字开关的I2C接口扩展器,通过I2C控制PCF8574将串行输入的数据并行输出,再将PCF8574的IO输出信号连接到数字开关控制信号上,对数字开关进行自由切换,从而实现在I2C总线上扩展出更多的I2C接口。通过多片PCF8574和数字开关的组合,最多可以实现数百个I2C模块的接入,选用不同规格的I2C接口扩展器可满足不同系统的需求。
An I2C interface extender based on PCF8574 and digital switch is introduced. It controls PCF8574 to parallel output serial input data through I2C, and then connects the IO output signal of PCF8574 and the digital switch control signal, completing free digital switch to expand more I2C interface on the I2C bus. The combination of multichip PCF8574 and digital switch can support the access of hundreds of I2C module. Different specifications of the I2C interface expander meet different system requirements.
出处
《电子产品可靠性与环境试验》
2012年第6期61-63,共3页
Electronic Product Reliability and Environmental Testing
关键词
扩展器
接口
总线
expander
interface
bus
