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BQ27542 i2c读取寄存器无ack

Other Parts Discussed in Thread: BQSTUDIO, BQ4050

问题:软件I2C,发slave 地址0xAA有ack,然后发寄存器0x08尝试读取电压,用逻辑分析仪看到发0x08后没有ack。尝试其他寄存器没有一个能够有ack的。

主要想知道为什么发寄存器地址后没有ack,看波形在发完0x08后有一段时间sda都为高

现象:波形图