中频解调电路中的I^2C总线接口电路

I^2C Bus Interface Circuit Applied in IF-PLL Demodulation

为了简化中频解调电路的外围接口电路,缩小芯片面积,提高芯片的通用性和可靠性,在I2C总线数据传输协议的基础上,设计一个兼容I2C协议的中频解调接口电路。为了防止芯片地址冲突,增加了4位地址选择位,并重点对接口电路的状态机与控制逻辑进行优化设置。仿真结果表明,该电路功能正确,可靠性高,可广泛用于TV,VTR,PC,STB等方面。

An interface circuit compatible with I^2C communication protocol applied in IF-PLL demodulation was designed based on the I^2C bus communication protocol, in order to simplify peripheral interface circuit of IF-PLL demodulation circuit, reduce its area, improve its universality and stability. There are four possible slave addresses available for avoiding conflicts in real application with other devices. The state-machine and control logic were devised and optimized chiefly. The results of simulation prove that the circuit has correct functions and high reliability. The interface circuit can be widely applied in TV, VTR, PC and STB applications.