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为什么bq76930通讯正常,却无法打开或关闭CHG或DSG?

Other Parts Discussed in Thread: BQ76930

如题,我的bq76930通讯正常,但却无法打开或关闭CHG或DSG... 

比如:我向SYS_CTRL2 (0x05),写入值0x43, 按datasheet我的操作应该是CC_EN 置1, CHG_ON置1,DSG_ON置1... 但是实际上CHG和DSG却无任何反映,充放电MOS的G极量不到电压,而且我去读SYS_CTRL2 (0x05),读回来的值却只有0x40... 也就是说CHG_ON, DSG_ON的0x03被忽略了。。


求解