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BQ27220 I2C无法正常读写

Other Parts Discussed in Thread: BQ24295, BQ27220, BQSTUDIO

我参考TRM上面给的例程想要把 Design Capacity 改成 5000mAh,但是改完之后通过I2C读取0x3C的数据并不是5000也不是预设值,然后我读取了其它寄存器的数据,有很多都是0xFF。因为我在同时用BQ24295和BQ27220,BQ24295的I2C数据读写正常,但是BQ27220的I2C读写有问题,我想问一下这种情况有什么解决办法吗?