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BQ34110EVM-796: Access mode update

Part Number: BQ34110EVM-796


I'm using battery monitor chip (with mentioned part number), and I have an issue while updating access mode.

My steps as the following:

1- Read access mode by reading operation status register and get SEC0 bit and SEC1 bit (1,0) which represented by "Full Access mode".

2- Update access mode to "Sealed mode" by writing 0x0030 to address 0x00.

3- Repeat step one again which return (1,1) i.e. "Sealed mode", this means that access mode updated successfully.

4- After some milliseconds, I'm repeating step one again but it returns (1,0) "Full Access mode" !

Why access mode returned to default mode automatically ?!

Thank you