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MCF8315A: IIC无应答

Part Number: MCF8315A
Other Parts Discussed in Thread: MCF8315EVM, MSP430FR2355

MCF8315A不响应IIC 无回应(从没成功过),不仅0x01地址无ACK回应,对所有地址也都无回应,不响应手册上说的 黄色ACK信号;

 

 

电路如下

做过以下检查,

供电如下:

VM电源12V,

DVDD电压1.55V,

AVDD电压3.6V,

FG 10K电阻已经确认连接正常,

VCP电压5.1V,

IIC逻辑高3.3V,逻辑低0V,工作频率6Khz(尝试增加降低频率均不可行)

BRAKE 电压0V

SPEED/WAKE保持71.9Khz 90%PWM信号(尝试取消了C8也不行)

IIC逻辑分析仪时序如下: