一种基于VG2控制的I^2C总线键盘接口设计

A key circuit design with the I^2C bus based on VG2 controlling

采用ADCh ips公司的32位多媒体芯片V irg ine G 2与具有I2C总线接口的M 62334 DAC的连接,实现了轿车视音汉字显示操作控制系统的AD键方式键盘控制和自定义数字键盘控制;文章介绍了V irg ine G 2与I2C总线控制的自定义接口与通信协议,论述了系统功能特点,给出了硬件电路原理图和软件设计框图;用该电路对西门子CD 723汽车音响控制器、车载电视及DVD等设备进行控制,功能强,效果好。

In this paper,the interface circuit of M62334 and Virgine G2 （VG2） manufactured by AD-Chips Co. is adopted,and the AD key-control mode and the self-defining digital key-control mode in the car＇s vision and sound display control system are designed. The selfefining interface and commu- nication protocol between Virgine G2 and the I2C bus are introduced. The system＇s functions, hardware circuit-diagram and software flow chart are described. The circuit is applied to control of the car＇s sound controller of SIEMENS CD723 and TV and DVD devices,and the effect is good.