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TPS65910芯片通过I2C配置寄存器后,重新加电恢复成默认值的问题

Other Parts Discussed in Thread: TPS65910

通过DSP6748的I2C接口对TPS65910芯片的寄存器进行写入新的值,写入后马上读取,读回来的值是新的值。但是重新加电后,再读取那个寄存器,就恢复成了原来的默认值,请问这是怎么回事?