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BQ25120 Programming Question

Other Parts Discussed in Thread: BQ25120, CC2540, BQ25121

Is it possible to pre-program the BQ25120 with a Vsys voltage other than 1.8V and then remove power from the device and have the register settings be saved.

Is the memory non-volatile? 

Otherwise, how can a system that requires anything other than 1.8V from Vsys, program the BQ25120 over i2c from their MCU, if it can't boot from the default setting of 1.8V?

Joe Howard