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MSP430F5529使用I2C口读取OPT3001 ,无应答

Other Parts Discussed in Thread: MSP430F5529, OPT3001

MSP430F5529使用I2C口读取OPT3001 ,在发送START命令后,可以在DAT线上看到地址0X44,但是OPT3001无响应,UCNACKIFG位被置位,且SCL时钟一直被拉低,这是什么原因