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Is CC2541 GPIO Hard Grounded?

Other Parts Discussed in Thread: CC2541

Hello folks, I want to use one of the GPIOs on 2541 (maybe interrupts too) to switch on/off another chip via a FET. I need to be absolutely sure that the GPIO is hard grounded, therefore gives 0uA (low) while sleeping. 

I'm looking at 10+ years of battery life, so this is very important to me. Can someone give me any information on this subject? Thanks in advance!

Harry