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TPS549A20: TPS549A20 WRITE_PROTECT Register has value 0x00

Part Number: TPS549A20
Other Parts Discussed in Thread: TPS544B20

Hi all,

I have some trouble with the WRITE_PROTECT register. I want to lock the PMIC so the WRITE_PROTECT [10h] register should has the value 0x40.

If i write this to the register and read it back everything is fine but if I do a power cycle the register value is 0x00 again.

As I can see in the in the datasheet this register is not in NVM but is it possible that the register has value 0x40 after power cycle?

Thanks,

Maximilian